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Private address on traceroute through ISP

  • 18-05-2013 11:58am
    #1
    Nate--IRL--
    Registered Users, Registered Users 2 Posts: 2,230 ✭✭✭


    Probably a silly question, but... I notice when using a certain ISP that for the connection I'm on, running a trace to say Google, it will first hit my WAN IP gateway, then transition though 3 hops of Private addresses before exiting their network and then on to Google.

    I am wondering, given that private addresses are in the route, could this lead to conflicts if one of these private addresses range matches my internal network range?

    Nate


Comments

  • #2
    moc moc a moc
    Registered Users, Registered Users 2 Posts: 1,299 ✭✭✭moc moc a moc


    No. Your outbound traffic will (almost certainly) be NAT-ed to your gateway's external IP before hitting the ISP network, so there won't be any conflict.


  • #3
    Nate--IRL--
    Registered Users, Registered Users 2 Posts: 2,230 ✭✭✭Nate--IRL--


    Yep that makes sense, thanks.

    I just found it odd to see 192.168.x.x in the trace after it left my Network.

    Nate


  • #4
    gctest50
    Registered Users, Registered Users 2 Posts: 9,605 ✭✭✭gctest50


    traceroute obiwan.scrye.net


  • #5
    moc moc a moc
    Registered Users, Registered Users 2 Posts: 1,299 ✭✭✭moc moc a moc


    Nate--IRL-- wrote: »
    I just found it odd to see 192.168.x.x in the trace after it left my Network.

    Welcome to the world of IPv4 address shortage. Even ISPs have to watch their public address usage these days.


  • #6
    ArseBurger
    Registered Users, Registered Users 2 Posts: 647 ✭✭✭ArseBurger


    moc moc a moc wrote: »
    Welcome to the world of IPv4 address shortage. Even ISPs have to watch their public address usage these days.

    These days? This has been standard practice since the early 90's. Basic networking.


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  • #7
    noclee
    Registered Users, Registered Users 2 Posts: 141 ✭✭noclee


    This is normal with transit routers and also give's the added advantage of security, but can be blocked by some firewalls sometimes, which can cause other issue's i.e. pmtu.


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