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#1
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Cannot set up ICS
I received the following message when I tried to set up a home network on the
host computer using the Network Setup Wizard: "Windows cannot set up this computer to share its internet connection because the IP address it needs (192.168.0.1) is being used by another computer or device on the network, or by software running on this computer." I'm trying to connect my PC and laptop (both running Win XP SP2) to share an internet connection. I also have a printer on the network. I'm using a USB DSL modem and connect the two PCs to a router. How can I find out which device or software is preventing the host computer from acquiring the required IP address? I've checked and my laptop is not using the required IP address. Thanks in advance. |
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#2
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Cannot set up ICS
The 192.168.0.1 address is probably the router. If this is a NAT router and
you can connect the modem to the WAN (Internet) port of the router, then you do not need ICS in this scenario. Doug Sherman MCSE Win2k/NT4.0, MCSA, MCP+I, MVP "skyhom" wrote in message ... I received the following message when I tried to set up a home network on the host computer using the Network Setup Wizard: "Windows cannot set up this computer to share its internet connection because the IP address it needs (192.168.0.1) is being used by another computer or device on the network, or by software running on this computer." I'm trying to connect my PC and laptop (both running Win XP SP2) to share an internet connection. I also have a printer on the network. I'm using a USB DSL modem and connect the two PCs to a router. How can I find out which device or software is preventing the host computer from acquiring the required IP address? I've checked and my laptop is not using the required IP address. Thanks in advance. --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.782 / Virus Database: 528 - Release Date: 10-22-2004 |
#3
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Cannot set up ICS
hmm...the problem is, I cannot connect the USB modem to the router. The USB
plug on my modem goes to the USB port on my PC and there's a phone jack for the telephone line. That's it, nothing on the modem that connects to the router directly. So I figured out I'll have to set up ICS. Any way to assign a different IP address to the router? "Doug Sherman [MVP]" wrote: The 192.168.0.1 address is probably the router. If this is a NAT router and you can connect the modem to the WAN (Internet) port of the router, then you do not need ICS in this scenario. Doug Sherman MCSE Win2k/NT4.0, MCSA, MCP+I, MVP "skyhom" wrote in message ... I received the following message when I tried to set up a home network on the host computer using the Network Setup Wizard: "Windows cannot set up this computer to share its internet connection because the IP address it needs (192.168.0.1) is being used by another computer or device on the network, or by software running on this computer." I'm trying to connect my PC and laptop (both running Win XP SP2) to share an internet connection. I also have a printer on the network. I'm using a USB DSL modem and connect the two PCs to a router. How can I find out which device or software is preventing the host computer from acquiring the required IP address? I've checked and my laptop is not using the required IP address. Thanks in advance. --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.782 / Virus Database: 528 - Release Date: 10-22-2004 |
#4
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Cannot set up ICS
skyhom wrote:
hmm...the problem is, I cannot connect the USB modem to the router. The USB plug on my modem goes to the USB port on my PC and there's a phone jack for the telephone line. That's it, nothing on the modem that connects to the router directly. So I figured out I'll have to set up ICS. Any way to assign a different IP address to the router? With most routers, you can change the LAN-side IPA. Log into the router, and look at its configuration pages. The down side is that whenever you do a hard reset on the router, it may return to its default IPA: to recover from that, you'll need to turn off ICS, then change the router's IPA, then turn ICS back on. -- Cheers, Bob |
#5
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Cannot set up ICS
Question...I'm having similiar ICS connectivity problems between a
deskop and laptop and was wondering, is there no way to change the default static IP on the ICS host that Windows XP assigns? In my case, I know 192.168.0.1 is my router and I can change the router address if needed...but i'd rather not since it would require me to change the default gateway on all my networked PC's (all static). Currently i'm trying to setup ICS between a deskop (which connects wireless to the router; XP Home) and a laptop (2000 Pro). From the laptop, I'm able to ping the desktop and see all shared files/folders on the desktop. My last step (i'm assuming) is to share the wireless internet connection on the desktop so the laptop can access the net. But i'm running into the same error when I attempt to share the connection, hence, my question about the default static IP. Thanks. -AGS Doug Sherman [MVP] wrote: The 192.168.0.1 address is probably the router. If this is a NAT router and you can connect the modem to the WAN (Internet) port of the router, then you do not need ICS in this scenario. Doug Sherman MCSE Win2k/NT4.0, MCSA, MCP+I, MVP "skyhom" wrote in message ... I received the following message when I tried to set up a home network on the host computer using the Network Setup Wizard: "Windows cannot set up this computer to share its internet connection because the IP address it needs (192.168.0.1) is being used by another computer or device on the network, or by software running on this computer." I'm trying to connect my PC and laptop (both running Win XP SP2) to share an internet connection. I also have a printer on the network. I'm using a USB DSL modem and connect the two PCs to a router. How can I find out which device or software is preventing the host computer from acquiring the required IP address? I've checked and my laptop is not using the required IP address. Thanks in advance. --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.782 / Virus Database: 528 - Release Date: 10-22-2004 |
#6
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Cannot set up ICS
AGS wrote:
Question...I'm having similiar ICS connectivity problems between a deskop and laptop and was wondering, is there no way to change the default static IP on the ICS host that Windows XP assigns? In my case, I know 192.168.0.1 is my router and I can change the router address if needed...but i'd rather not since it would require me to change the default gateway on all my networked PC's (all static). Currently i'm trying to setup ICS between a deskop (which connects wireless to the router; XP Home) and a laptop (2000 Pro). From the laptop, I'm able to ping the desktop and see all shared files/folders on the desktop. My last step (i'm assuming) is to share the wireless internet connection on the desktop so the laptop can access the net. But i'm running into the same error when I attempt to share the connection, hence, my question about the default static IP. Thanks. -AGS ICS does not allow you to change the IPA it uses for itself (the ICS server) or the range of IPAs it hands out to ICS clients. Most routers do allow you to change their LAN-side IPA. But, when you need to hard-reset the router, the IPA may revert to its default value. Since you have a router, I don't understand why you also want to use ICS. Hardware routing is more robust than software (ICS) routing, and avoids the conflict over 192.168.0.1. -- Cheers, Bob |
#7
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Cannot set up ICS
Bob Willard wrote:
AGS wrote: Question...I'm having similiar ICS connectivity problems between a deskop and laptop and was wondering, is there no way to change the default static IP on the ICS host that Windows XP assigns? In my case, I know 192.168.0.1 is my router and I can change the router address if needed...but i'd rather not since it would require me to change the default gateway on all my networked PC's (all static). Currently i'm trying to setup ICS between a deskop (which connects wireless to the router; XP Home) and a laptop (2000 Pro). From the laptop, I'm able to ping the desktop and see all shared files/folders on the desktop. My last step (i'm assuming) is to share the wireless internet connection on the desktop so the laptop can access the net. But i'm running into the same error when I attempt to share the connection, hence, my question about the default static IP. Thanks. -AGS ICS does not allow you to change the IPA it uses for itself (the ICS server) or the range of IPAs it hands out to ICS clients. Most routers do allow you to change their LAN-side IPA. But, when you need to hard-reset the router, the IPA may revert to its default value. Since you have a router, I don't understand why you also want to use ICS. Hardware routing is more robust than software (ICS) routing, and avoids the conflict over 192.168.0.1. Thanks for the reply. The reason i'm using ICS in between this particular desktop and laptop is because the laptop is too far away from the router to be plugged in directly and it has no wireless card. Granted, I could go out and buy a wireless card for it but thought it would be more cost effecient if I could get the ICS up and running between the two. So from my understanding, since the default IPA with ICS cannot be changed, there can only really be one ICS up and running at any given time. If I attempt to setup ICS on another pair of PC's in my home-office, it probably wouldn't work since there is already a PC on the network with the static IP of 192.168.0.1. Is this assumption correct? -AGS |
#8
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Cannot set up ICS
AGS wrote:
Bob Willard wrote: AGS wrote: Question...I'm having similiar ICS connectivity problems between a deskop and laptop and was wondering, is there no way to change the default static IP on the ICS host that Windows XP assigns? In my case, I know 192.168.0.1 is my router and I can change the router address if needed...but i'd rather not since it would require me to change the default gateway on all my networked PC's (all static). Currently i'm trying to setup ICS between a deskop (which connects wireless to the router; XP Home) and a laptop (2000 Pro). From the laptop, I'm able to ping the desktop and see all shared files/folders on the desktop. My last step (i'm assuming) is to share the wireless internet connection on the desktop so the laptop can access the net. But i'm running into the same error when I attempt to share the connection, hence, my question about the default static IP. Thanks. -AGS ICS does not allow you to change the IPA it uses for itself (the ICS server) or the range of IPAs it hands out to ICS clients. Most routers do allow you to change their LAN-side IPA. But, when you need to hard-reset the router, the IPA may revert to its default value. Since you have a router, I don't understand why you also want to use ICS. Hardware routing is more robust than software (ICS) routing, and avoids the conflict over 192.168.0.1. Thanks for the reply. The reason i'm using ICS in between this particular desktop and laptop is because the laptop is too far away from the router to be plugged in directly and it has no wireless card. Granted, I could go out and buy a wireless card for it but thought it would be more cost effecient if I could get the ICS up and running between the two. So from my understanding, since the default IPA with ICS cannot be changed, there can only really be one ICS up and running at any given time. If I attempt to setup ICS on another pair of PC's in my home-office, it probably wouldn't work since there is already a PC on the network with the static IP of 192.168.0.1. Is this assumption correct? -AGS That depends on the physical connectivity. For example, suppose A, B, C, and D are PCs and R is a Router (with connectivity to the external 'net). If the connections look like this: A===B===R===C===D | +------------------ WAN-side link, to the 'net and B is the ICS server for A, and C is the ICS server for D, then both B and C can use the normal 192.168.0.1 ICS server IPA, and both B and C can assign 192.168.0.2 to A and D, *as long as* R is not using the 192.168.0.1 IPA on its LAN side. The key is that 192.168.0.x are non-routable IPAs: C and D know that 192.168.0.1 belongs to C, but that information is hidden from A, B, and R; also, A and B know that 192.168.0.1 belongs to B, but that infomation is hidden from C, D, and R. {If R also tries to use 192.168.0.1, then B and C know about two nodes with the same IPA: B knows about R and itself, and C knows about R and itself -- that is a no-no.} If the above diagram does not make sense to you, note that B and C both have two NICs and each NIC has its own IPA: one is the downhill NIC/IPA to its ICS client, and one is the uphill NIC/IPA to the router. And, it makes no difference whether those connections are wired or wireless. {Ain't ASCII-art wonderful?} -- Cheers, Bob |
#9
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Cannot set up ICS
Bob Willard wrote:
AGS wrote: Bob Willard wrote: AGS wrote: Question...I'm having similiar ICS connectivity problems between a deskop and laptop and was wondering, is there no way to change the default static IP on the ICS host that Windows XP assigns? In my case, I know 192.168.0.1 is my router and I can change the router address if needed...but i'd rather not since it would require me to change the default gateway on all my networked PC's (all static). Currently i'm trying to setup ICS between a deskop (which connects wireless to the router; XP Home) and a laptop (2000 Pro). From the laptop, I'm able to ping the desktop and see all shared files/folders on the desktop. My last step (i'm assuming) is to share the wireless internet connection on the desktop so the laptop can access the net. But i'm running into the same error when I attempt to share the connection, hence, my question about the default static IP. Thanks. -AGS ICS does not allow you to change the IPA it uses for itself (the ICS server) or the range of IPAs it hands out to ICS clients. Most routers do allow you to change their LAN-side IPA. But, when you need to hard-reset the router, the IPA may revert to its default value. Since you have a router, I don't understand why you also want to use ICS. Hardware routing is more robust than software (ICS) routing, and avoids the conflict over 192.168.0.1. Thanks for the reply. The reason i'm using ICS in between this particular desktop and laptop is because the laptop is too far away from the router to be plugged in directly and it has no wireless card. Granted, I could go out and buy a wireless card for it but thought it would be more cost effecient if I could get the ICS up and running between the two. So from my understanding, since the default IPA with ICS cannot be changed, there can only really be one ICS up and running at any given time. If I attempt to setup ICS on another pair of PC's in my home-office, it probably wouldn't work since there is already a PC on the network with the static IP of 192.168.0.1. Is this assumption correct? -AGS That depends on the physical connectivity. For example, suppose A, B, C, and D are PCs and R is a Router (with connectivity to the external 'net). If the connections look like this: A===B===R===C===D | +------------------ WAN-side link, to the 'net and B is the ICS server for A, and C is the ICS server for D, then both B and C can use the normal 192.168.0.1 ICS server IPA, and both B and C can assign 192.168.0.2 to A and D, *as long as* R is not using the 192.168.0.1 IPA on its LAN side. The key is that 192.168.0.x are non-routable IPAs: C and D know that 192.168.0.1 belongs to C, but that information is hidden from A, B, and R; also, A and B know that 192.168.0.1 belongs to B, but that infomation is hidden from C, D, and R. {If R also tries to use 192.168.0.1, then B and C know about two nodes with the same IPA: B knows about R and itself, and C knows about R and itself -- that is a no-no.} If the above diagram does not make sense to you, note that B and C both have two NICs and each NIC has its own IPA: one is the downhill NIC/IPA to its ICS client, and one is the uphill NIC/IPA to the router. And, it makes no difference whether those connections are wired or wireless. {Ain't ASCII-art wonderful?} ASCII-art is wonderful, indeed. A===B===R===C===D Ok, I follow the diagram but still having difficulty understanding how B and C would not know about each other if they connect to the same router and are on the same domain. For example, lets say we add two more PCs to the diagram, E and F, and neither are setup for ICS. E | A===B===R===C===D | F E has the IPA of 192.168.0.6 and F has the IPA of 192.168.0.7. E and F can see each other on the network and both have their own respective wired/wireless connection to R. So how is it that B and C would not? If I were to go to either E or F and say ping 192.168.0.1, whom would respond? Thanks again for the response. -AGS |
#10
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Cannot set up ICS
AGS wrote:
Bob Willard wrote: AGS wrote: Bob Willard wrote: AGS wrote: Question...I'm having similiar ICS connectivity problems between a deskop and laptop and was wondering, is there no way to change the default static IP on the ICS host that Windows XP assigns? In my case, I know 192.168.0.1 is my router and I can change the router address if needed...but i'd rather not since it would require me to change the default gateway on all my networked PC's (all static). Currently i'm trying to setup ICS between a deskop (which connects wireless to the router; XP Home) and a laptop (2000 Pro). From the laptop, I'm able to ping the desktop and see all shared files/folders on the desktop. My last step (i'm assuming) is to share the wireless internet connection on the desktop so the laptop can access the net. But i'm running into the same error when I attempt to share the connection, hence, my question about the default static IP. Thanks. -AGS ICS does not allow you to change the IPA it uses for itself (the ICS server) or the range of IPAs it hands out to ICS clients. Most routers do allow you to change their LAN-side IPA. But, when you need to hard-reset the router, the IPA may revert to its default value. Since you have a router, I don't understand why you also want to use ICS. Hardware routing is more robust than software (ICS) routing, and avoids the conflict over 192.168.0.1. Thanks for the reply. The reason i'm using ICS in between this particular desktop and laptop is because the laptop is too far away from the router to be plugged in directly and it has no wireless card. Granted, I could go out and buy a wireless card for it but thought it would be more cost effecient if I could get the ICS up and running between the two. So from my understanding, since the default IPA with ICS cannot be changed, there can only really be one ICS up and running at any given time. If I attempt to setup ICS on another pair of PC's in my home-office, it probably wouldn't work since there is already a PC on the network with the static IP of 192.168.0.1. Is this assumption correct? -AGS That depends on the physical connectivity. For example, suppose A, B, C, and D are PCs and R is a Router (with connectivity to the external 'net). If the connections look like this: A===B===R===C===D | +------------------ WAN-side link, to the 'net and B is the ICS server for A, and C is the ICS server for D, then both B and C can use the normal 192.168.0.1 ICS server IPA, and both B and C can assign 192.168.0.2 to A and D, *as long as* R is not using the 192.168.0.1 IPA on its LAN side. The key is that 192.168.0.x are non-routable IPAs: C and D know that 192.168.0.1 belongs to C, but that information is hidden from A, B, and R; also, A and B know that 192.168.0.1 belongs to B, but that infomation is hidden from C, D, and R. {If R also tries to use 192.168.0.1, then B and C know about two nodes with the same IPA: B knows about R and itself, and C knows about R and itself -- that is a no-no.} If the above diagram does not make sense to you, note that B and C both have two NICs and each NIC has its own IPA: one is the downhill NIC/IPA to its ICS client, and one is the uphill NIC/IPA to the router. And, it makes no difference whether those connections are wired or wireless. {Ain't ASCII-art wonderful?} ASCII-art is wonderful, indeed. A===B===R===C===D Ok, I follow the diagram but still having difficulty understanding how B and C would not know about each other if they connect to the same router and are on the same domain. For example, lets say we add two more PCs to the diagram, E and F, and neither are setup for ICS. E | A===B===R===C===D | F E has the IPA of 192.168.0.6 and F has the IPA of 192.168.0.7. E and F can see each other on the network and both have their own respective wired/wireless connection to R. So how is it that B and C would not? If I were to go to either E or F and say ping 192.168.0.1, whom would respond? Thanks again for the response. -AGS Let's take the case of B, the ICS server for A. B has two NICs (one to connect to A and one to R), and each NIC has its own IPA. The IPA for ICS, 192.168.0.1, is visible to B and to A, but -- since it is a non-routable IPA -- it is not visible to R (or C, D, E, or F). By not visible, I mean that an IP packet with a destination IPA of 192.168.0.1 when delivered to B through the NIC that connects to R will be discarded: it will not be routed (by B) from its right-hand NIC to its left-hand NIC. {A classic example of the saying that the left hand does not know what the right hand is doing. ;-) } As for the ping question: if the 192.168.0.1 network above is properly configured, then when E pings 192.168.0.1, nobody will respond. In an improper configuration, with R using 192.168.0.1 as its LAN-side IPA, then when E pings 192.168.0.1, R will respond; however, when B pings 192.168.0.1, there are *two* potential responders -- B and R -- which is why this configuration is improper. That illustrates why, in the A/B/C/D/E/F/R network above, you must not allow R to use 192.168.0.1 if nodes connected to R are also ICS servers. If you want to create a network like A/B/C/D/E/F/R with R using 192.168.0.1 as its LAN-side IPA, then you must not use ICS. There are some non-M$ products that do software routing but are more flexible than ICS; none come to mind, but you can Google. -- Cheers, Bob |
#11
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Cannot set up ICS
Bob Willard wrote:
AGS wrote: Bob Willard wrote: AGS wrote: Bob Willard wrote: AGS wrote: Question...I'm having similiar ICS connectivity problems between a deskop and laptop and was wondering, is there no way to change the default static IP on the ICS host that Windows XP assigns? In my case, I know 192.168.0.1 is my router and I can change the router address if needed...but i'd rather not since it would require me to change the default gateway on all my networked PC's (all static). Currently i'm trying to setup ICS between a deskop (which connects wireless to the router; XP Home) and a laptop (2000 Pro). From the laptop, I'm able to ping the desktop and see all shared files/folders on the desktop. My last step (i'm assuming) is to share the wireless internet connection on the desktop so the laptop can access the net. But i'm running into the same error when I attempt to share the connection, hence, my question about the default static IP. Thanks. -AGS ICS does not allow you to change the IPA it uses for itself (the ICS server) or the range of IPAs it hands out to ICS clients. Most routers do allow you to change their LAN-side IPA. But, when you need to hard-reset the router, the IPA may revert to its default value. Since you have a router, I don't understand why you also want to use ICS. Hardware routing is more robust than software (ICS) routing, and avoids the conflict over 192.168.0.1. Thanks for the reply. The reason i'm using ICS in between this particular desktop and laptop is because the laptop is too far away from the router to be plugged in directly and it has no wireless card. Granted, I could go out and buy a wireless card for it but thought it would be more cost effecient if I could get the ICS up and running between the two. So from my understanding, since the default IPA with ICS cannot be changed, there can only really be one ICS up and running at any given time. If I attempt to setup ICS on another pair of PC's in my home-office, it probably wouldn't work since there is already a PC on the network with the static IP of 192.168.0.1. Is this assumption correct? -AGS That depends on the physical connectivity. For example, suppose A, B, C, and D are PCs and R is a Router (with connectivity to the external 'net). If the connections look like this: A===B===R===C===D | +------------------ WAN-side link, to the 'net and B is the ICS server for A, and C is the ICS server for D, then both B and C can use the normal 192.168.0.1 ICS server IPA, and both B and C can assign 192.168.0.2 to A and D, *as long as* R is not using the 192.168.0.1 IPA on its LAN side. The key is that 192.168.0.x are non-routable IPAs: C and D know that 192.168.0.1 belongs to C, but that information is hidden from A, B, and R; also, A and B know that 192.168.0.1 belongs to B, but that infomation is hidden from C, D, and R. {If R also tries to use 192.168.0.1, then B and C know about two nodes with the same IPA: B knows about R and itself, and C knows about R and itself -- that is a no-no.} If the above diagram does not make sense to you, note that B and C both have two NICs and each NIC has its own IPA: one is the downhill NIC/IPA to its ICS client, and one is the uphill NIC/IPA to the router. And, it makes no difference whether those connections are wired or wireless. {Ain't ASCII-art wonderful?} ASCII-art is wonderful, indeed. A===B===R===C===D Ok, I follow the diagram but still having difficulty understanding how B and C would not know about each other if they connect to the same router and are on the same domain. For example, lets say we add two more PCs to the diagram, E and F, and neither are setup for ICS. E | A===B===R===C===D | F E has the IPA of 192.168.0.6 and F has the IPA of 192.168.0.7. E and F can see each other on the network and both have their own respective wired/wireless connection to R. So how is it that B and C would not? If I were to go to either E or F and say ping 192.168.0.1, whom would respond? Thanks again for the response. -AGS Let's take the case of B, the ICS server for A. B has two NICs (one to connect to A and one to R), and each NIC has its own IPA. The IPA for ICS, 192.168.0.1, is visible to B and to A, but -- since it is a non-routable IPA -- it is not visible to R (or C, D, E, or F). By not visible, I mean that an IP packet with a destination IPA of 192.168.0.1 when delivered to B through the NIC that connects to R will be discarded: it will not be routed (by B) from its right-hand NIC to its left-hand NIC. {A classic example of the saying that the left hand does not know what the right hand is doing. ;-) } As for the ping question: if the 192.168.0.1 network above is properly configured, then when E pings 192.168.0.1, nobody will respond. In an improper configuration, with R using 192.168.0.1 as its LAN-side IPA, then when E pings 192.168.0.1, R will respond; however, when B pings 192.168.0.1, there are *two* potential responders -- B and R -- which is why this configuration is improper. That illustrates why, in the A/B/C/D/E/F/R network above, you must not allow R to use 192.168.0.1 if nodes connected to R are also ICS servers. If you want to create a network like A/B/C/D/E/F/R with R using 192.168.0.1 as its LAN-side IPA, then you must not use ICS. There are some non-M$ products that do software routing but are more flexible than ICS; none come to mind, but you can Google. All my questions are answered. Thanks for all the great information. BTW, I ended up dropping the whole ICS between my desktop and laptop. I changed the router IPA and verified that none of the PCs on the network were using 192.168.0.1, but any attempt to share the ISP connection on my desktop failed with Windows complaining that the 192.168.0.1 was in use. Not sure what was causing the conflict. Friend of mine had an extra 802.11b wireless card laying around and ended up using it to setup the laptop on the network. All is now well. -AGS |
#12
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Cannot set up ICS
AGS wrote:
Bob Willard wrote: AGS wrote: Bob Willard wrote: AGS wrote: Bob Willard wrote: AGS wrote: Question...I'm having similiar ICS connectivity problems between a deskop and laptop and was wondering, is there no way to change the default static IP on the ICS host that Windows XP assigns? In my case, I know 192.168.0.1 is my router and I can change the router address if needed...but i'd rather not since it would require me to change the default gateway on all my networked PC's (all static). Currently i'm trying to setup ICS between a deskop (which connects wireless to the router; XP Home) and a laptop (2000 Pro). From the laptop, I'm able to ping the desktop and see all shared files/folders on the desktop. My last step (i'm assuming) is to share the wireless internet connection on the desktop so the laptop can access the net. But i'm running into the same error when I attempt to share the connection, hence, my question about the default static IP. Thanks. -AGS ICS does not allow you to change the IPA it uses for itself (the ICS server) or the range of IPAs it hands out to ICS clients. Most routers do allow you to change their LAN-side IPA. But, when you need to hard-reset the router, the IPA may revert to its default value. Since you have a router, I don't understand why you also want to use ICS. Hardware routing is more robust than software (ICS) routing, and avoids the conflict over 192.168.0.1. Thanks for the reply. The reason i'm using ICS in between this particular desktop and laptop is because the laptop is too far away from the router to be plugged in directly and it has no wireless card. Granted, I could go out and buy a wireless card for it but thought it would be more cost effecient if I could get the ICS up and running between the two. So from my understanding, since the default IPA with ICS cannot be changed, there can only really be one ICS up and running at any given time. If I attempt to setup ICS on another pair of PC's in my home-office, it probably wouldn't work since there is already a PC on the network with the static IP of 192.168.0.1. Is this assumption correct? -AGS That depends on the physical connectivity. For example, suppose A, B, C, and D are PCs and R is a Router (with connectivity to the external 'net). If the connections look like this: A===B===R===C===D | +------------------ WAN-side link, to the 'net and B is the ICS server for A, and C is the ICS server for D, then both B and C can use the normal 192.168.0.1 ICS server IPA, and both B and C can assign 192.168.0.2 to A and D, *as long as* R is not using the 192.168.0.1 IPA on its LAN side. The key is that 192.168.0.x are non-routable IPAs: C and D know that 192.168.0.1 belongs to C, but that information is hidden from A, B, and R; also, A and B know that 192.168.0.1 belongs to B, but that infomation is hidden from C, D, and R. {If R also tries to use 192.168.0.1, then B and C know about two nodes with the same IPA: B knows about R and itself, and C knows about R and itself -- that is a no-no.} If the above diagram does not make sense to you, note that B and C both have two NICs and each NIC has its own IPA: one is the downhill NIC/IPA to its ICS client, and one is the uphill NIC/IPA to the router. And, it makes no difference whether those connections are wired or wireless. {Ain't ASCII-art wonderful?} ASCII-art is wonderful, indeed. A===B===R===C===D Ok, I follow the diagram but still having difficulty understanding how B and C would not know about each other if they connect to the same router and are on the same domain. For example, lets say we add two more PCs to the diagram, E and F, and neither are setup for ICS. E | A===B===R===C===D | F E has the IPA of 192.168.0.6 and F has the IPA of 192.168.0.7. E and F can see each other on the network and both have their own respective wired/wireless connection to R. So how is it that B and C would not? If I were to go to either E or F and say ping 192.168.0.1, whom would respond? Thanks again for the response. -AGS Let's take the case of B, the ICS server for A. B has two NICs (one to connect to A and one to R), and each NIC has its own IPA. The IPA for ICS, 192.168.0.1, is visible to B and to A, but -- since it is a non-routable IPA -- it is not visible to R (or C, D, E, or F). By not visible, I mean that an IP packet with a destination IPA of 192.168.0.1 when delivered to B through the NIC that connects to R will be discarded: it will not be routed (by B) from its right-hand NIC to its left-hand NIC. {A classic example of the saying that the left hand does not know what the right hand is doing. ;-) } As for the ping question: if the 192.168.0.1 network above is properly configured, then when E pings 192.168.0.1, nobody will respond. In an improper configuration, with R using 192.168.0.1 as its LAN-side IPA, then when E pings 192.168.0.1, R will respond; however, when B pings 192.168.0.1, there are *two* potential responders -- B and R -- which is why this configuration is improper. That illustrates why, in the A/B/C/D/E/F/R network above, you must not allow R to use 192.168.0.1 if nodes connected to R are also ICS servers. If you want to create a network like A/B/C/D/E/F/R with R using 192.168.0.1 as its LAN-side IPA, then you must not use ICS. There are some non-M$ products that do software routing but are more flexible than ICS; none come to mind, but you can Google. All my questions are answered. Thanks for all the great information. BTW, I ended up dropping the whole ICS between my desktop and laptop. I changed the router IPA and verified that none of the PCs on the network were using 192.168.0.1, but any attempt to share the ISP connection on my desktop failed with Windows complaining that the 192.168.0.1 was in use. Not sure what was causing the conflict. Friend of mine had an extra 802.11b wireless card laying around and ended up using it to setup the laptop on the network. All is now well. -AGS Glad to have helped. -- Cheers, Bob |
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