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3Network mobile broadband addressing and routing



 
 
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Old August 23rd 09, 10:10 AM posted to uk.telecom.broadband,microsoft.public.windowsxp.network_web
James Egan
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Posts: 257
Default 3Network mobile broadband addressing and routing


I am a bit puzzled by one or two 3mobile broadband issues and was
hoping someone might be able to explain it for me.

In particular I was wondering about port forwarding on my HSDPA/UMTS
router and whether or not it would work. The three.co.uk website
actually has a "how to" for setting up port forwarding on a Huawei
D100 router so I guess it's supposed to work but I don't know how.

I was expecting the router WAN ip address to be an assigned public
address from 3 but it isn't. In fact it is an address on private
network 10.0.0.0/8

These are the assigned addresses which are all private
Router ip 10.118.214.4
Router default gateway 10.64.64.64
Router DNS 172.31.140.69
Router DNS 172.31.76.69

A check on my public ip address using a web checker returns
217.171.129.71 which reverse looks up to nat71.mia.three.co.uk, part
of 3's "NAT Pool for Mobiles".

So if I am getting Internet access from a pool of NAT devices, how can
port forwarding work on my router unless the public ip address maps to
the routers (private) WAN ip address on a 1 to 1 basis? Perhaps it
does?

To try and shed some light I tried a tracert from one of the xp pc's
to www.dslreports.com but was even more bemused when it returned...

Tracing route to www.dslreports.com [209.123.109.175]
over a maximum of 30 hops:

1 2 ms 2 ms 2 ms 192.168.7.2
2 111 ms 120 ms 128 ms 172.31.88.36
3 128 ms 129 ms 129 ms 172.31.152.22
4 129 ms 129 ms 129 ms 217.171.129.125
5 128 ms 129 ms 130 ms 217.171.128.36
6 130 ms 129 ms 109 ms 172.31.252.114
7 148 ms 139 ms 140 ms 195.50.90.153
8 149 ms 159 ms 150 ms ae-34-52.ebr2.London1.Level3.net
[4.69.139.97]
9 ...


The first address is the private ip address of my router, the next two
hops are private addresses at 3, then two hops around public ip
addresses from 3's nat pool for mobiles, then a hop back inside 3's
private network and then finally out into the ether via level3
communications.

Thanks for any helpful explanations.


Jim.

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