T1 Router, 3Com 3016, setup got messed up as I can't reach any outside IP's as of 10am

Posted on 2007-10-03
Last Modified: 2007-10-08
I have a 3com 3016 router that has just stopped allowing internal ip's from reaching outside to the web.  I can still vpn into the office but tracert's, pings, and browsers are completed prohibited from getting out.  

In looking at the setup there is a LoopBack0, that I don't remember seeing before,  that takes my side ip address and loops it back to a address instead of hopping back to the providers ip address.

[my network] ------ ip address [my router] providers ip for me ------[www]

           It seems to me that this loop back from to is keeping me from getting outside.

Here is a router-table.
Routing Tables:
  Destination/Mask  Proto   Pref     Metric     Nexthop    Interface   Static   60         0 Serial0:0   Direct    0         0 LoopBack0  Direct    0         0 LoopBack0  Direct    0         0 Serial0:0  Static   70         0 Serial0:0  Direct    0         0 Serial0:0  Direct    0         0 LoopBack0  Direct    0         0 Ethernet0  Direct    0         0 LoopBack0

I need help resolving the before the morning.  Actually asap, thanks.
Question by:jpwallens
    LVL 12

    Expert Comment

    I'm a Cisco guy, but I would guess that the "Direct" routes are automatically generated.  Not added by anyone.  The ones you would be looking at are the "Static" routes.  Can you ping from the router? is the default route, meaning anything that can't go anywhere else will get sent to

    Author Comment

    Yes, the Direct routes are automatically generated.

    No, I can't ping, even from the router.

    So you're saying it's setup correctly.  Which I know it was but how did it just stop working at 10am yesterday.?

    Author Comment

    If I run a tracert to the first hop goes to and then the rest timeout.

    Tracing route to over a maximum of 30 hops

      1     1 ms     1 ms     1 ms
      2     *        *        *     Request timed out.
      3     *        *        *     Request timed out.
      4     *        *        *     Request timed out.
      5     *        *        *     Request timed out.

    Accepted Solution

    Never mind.
    There was a NAT setup on the serial 0:0 that was messing with the www traffic.
    Thanks for the input though, benhanson.

    That specific NAT route had been setup for a while and why it would just start redirecting traffic is a puzzle.

    Author Comment


    How do I close a question without awarding points?  
    LVL 1

    Expert Comment

    Closed, 500 points refunded.
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