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Thread: Has anyone ever seen an ISP's DNS do this before?

  1. #1
    Jay
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    Has anyone ever seen an ISP's DNS do this before?

    Hi, I recently noticed that I could ping an internet IP of 192.168.2.1 and 192.168.2.2

    I noticed that I could ping 192.168.2.1 and 192.168.2.2 even though the current IPs are all 192.168.0.x

    I have connected my laptop direct to the wireles router and tracert it

    this is how it looks

    Tracing route to 192.168.2.1 over a maximum of 30 hops

    1 2 ms 1 ms 3 ms RouterIP
    2 129 ms 118 ms 129 ms 195.188.121.17
    3 68 ms 72 ms 88 ms 80.193.192.1
    4 71 ms 88 ms 86 ms osr02hari-v99.network.virginmedia.net [195.182.179.82]
    5 83 ms 80 ms 86 ms pop-bb-b-ge-200-0.network.virginmedia.net [195.182.178.169]
    6 68 ms 59 ms 55 ms popl-t3core-1b-as0-0.network.virginmedia.net [213.105.174.237]
    7 77 ms 85 ms 86 ms 192.168.2.1

    Tracing route to 192.168.2.2 over a maximum of 30 hops

    1 2 ms 1 ms 3 ms RouterIP
    2 36 ms 39 ms 42 ms 195.188.121.17
    3 52 ms 46 ms 50 ms osr02hari-v11.network.virginmedia.net [62.30.144.39]
    4 59 ms 56 ms 63 ms pop-bb-b-ge-200-0.network.virginmedia.net [195.182.178.169]
    5 80 ms 86 ms 84 ms popl-t3core-1b-as0-0.network.virginmedia.net [213.105.174.237]
    6 48 ms 57 ms 47 ms popl-lam-2-pos1200.network.virginmedia.net [62.255.81.170]
    7 47 ms 48 ms 53 ms 192.168.2.2

    How can this be?
    Last edited by Jay; 26-11-2008 at 05:48 PM.
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    Re: Has anyone ever seen an ISP's DNS do this before?

    that nothin to do with DNS - thats some suspect routing within virgins own network I guess, given that 192.168.x.x is not supposed to be a routeable subnet. (Class C )
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    Jay
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    Re: Has anyone ever seen an ISP's DNS do this before?

    I have no idea why I thought was DNS and not a route issue.

    I wonder if this has anything to do with our leased lines (also provided by Telewest Business)

    1 site went live today but it should be routed via our Cisco 1841 not via our bog standard ADSL!

    Its still odd how they have routed that though.

    I wonder if 192.168.2.1 and 192.168.2.2 are their loop back test addresses? (they loop two ports together I think.) But even so how would they have set this up? The DSL has a standard Cisco ADSL router that I control and there is no way it could have been routed in that way. This has to be an internal issue.
    Last edited by Jay; 26-11-2008 at 06:11 PM.
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    Re: Has anyone ever seen an ISP's DNS do this before?

    Wow, I've never seen that before - odd bit of work by Virgin there!

    I've been told a story of one of my buddies' buddies in ...Singapore I think, his Modem was given a WAN IP address from the Class C Private Network, apparently his ISP was a sub-ISP of another ISP, and his internet traffic was being double-NAT'ed on their networks before reaching the internet!
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    Jay
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    Re: Has anyone ever seen an ISP's DNS do this before?

    I have been onto 2nd line, its a routing issue with VM. They have routed internal Class C addresses!

    Also its quite odd that...

    a: ) they have been routed and I was the only one to noticed
    b: ) They use 192.168.x.x range for what looks like edge cisco equipment
    c: ) They just laughed and said "oh yes, that is odd"
    Last edited by Jay; 26-11-2008 at 10:09 PM.
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    Re: Has anyone ever seen an ISP's DNS do this before?

    LOL, that's funny

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