On Oct 6, 10:39*pm, "Stephen Ford"
wrote:
What type of Internet security software?
McAfee

Are both PCs part of the same Windows "workgroup?"
Yes. As mentioned, if the old router is put back in place everything works
again, so the whole setup is correctly configured - well I assume it is
because it works ie PC-PC comms, PC-router comms, PC-internet access.

I have a feeling my desktop PC may be corrupt. I deleted any log files
recently that appeared below C:\ and then NTbackup stopped working.
Otherwise the PC seems to behave. I did this before trying the wireless
router, so I can't confirm whether the PC worked with the new router in
place or not. So there is something wierd going on between the PCs and the
PC & router.

What versions / service pack level are on each? Win XP Pro SP3

--
Regards
Stephen Ford

"smlunatick" wrote in message

...
On Oct 5, 9:47 pm, "Stephen Ford"
wrote:

Are you attempting to replace router1 with router 2 or adding router2?
Replace.

How do these two PCs connect to the router?
Wired. I want to limit the changes to one (new router only, not new router
and change to wireless).

It's odd that by using a different router one PC should fail to ping the
other PC but allow ping the other way.

"smlunatick" wrote in message

....
On Oct 4, 11:00 pm, "Stephen Ford"
wrote:

I have established that both routers assign the same IP addresses. Maybe
therefore this is perhaps not an issue?

I have confirmed that with router#1 both PCs can ping the other, the
printer
and router.

Further tests have shown that with router#2, PC#2 can ping PC#1 but PC#1
cannot ping PC#2.

Ping PC name is translated into the correct IP address on both PCs
even
though on PC#1 ping PC#2 times out.

So PC#1 seems dodgy... ?

Curiouser and curiouser...

"Jack [MVP-Networking]" wrote in message

...

Hi
The Router's NAT firewall affect only Traffic coming in from the
Internet.
The Router is a combo unit of Routing Circuit, and a switch in the
same
box.
LAN traffic is only using the switch.
The difference that you experience could be a result of different
setting
other Router's DHCP (Computers' IP assignment).
There are differences between Routers in the way they handle the IP
assignment. Some Routers keep the same IPs according the computer MAC
number.
Others can assigned it in up hazard manner (I.e. giving different IP
number to the same computer each time it starts.
The latter can confuse the LAN Traffic. The best is to use a Router
that
can do Static DHCP. I.e the computer's TCP/IP can be set-to Auto
Obtain
and they always would get the same IP.
Jack (MS, MVP-Networking).

"Stephen Ford" wrote in message
...
2-PC LAN + network printer + router

Win XP Pro SP3

Can Windows Firewall affect / stop LAN traffic? The following problem
often raises questions about the firewall and I want to understand
its
relevance. Discussions seems to get very convoluted and end up down
blind
alleys.

I contend that Windows Firewall (WF) only affects WAN traffic but I
suspect that just by replacing router#1 with router#2, this does not
result in the WF stopping PC-PC ping traffic. Is that right?

I am trying to replace a router with a new one. With router #1 in
place
Ping between the PCs works fine. With router#2 in place all network
traffic is fine (eg PC-printer, PC-router & PC-Internet) apart from
Ping
PC-PC.

I have been through the usual issues of network configuration issues
ad-nausium includin IP addresses, DNS, sub-net mask etc. In deed if
there
was a problem, then nothing would work with router#1 in place. But
with
router#1 in place all network comms is fine. Put router#2 in place
and
all network traffic is fine apart from ping PC-PC.

I have had "bad" experience with an Internet security "all in one"
software suite. I could access the Internet, ping all my network
printers and other PC. However, it blocked the network file sharing.
Then, that "on-line" support agent "scrapped" my PC. Then only thing
I could suggest is to uninstall McAfee and clear out all possible left-
over settings. Then, start from 'scratch" setting up you new router
and network.