comcast routing problems

[Ben Scott]

On Sun, Nov 1, 2009 at 11:58 AM, Frank DiPrete <fdiprete at comcast.net> wrote:
> Yes, my router is returning a hop count exceeded.
> There isn't much I can do about it. all of my traffic is sent to a dr
> assigned by dhcp.

  If it really is *your* router that's generating the Time Exceeded
message, then you're the *only* one who can do anything about it.

  If your router is generating a Time Exceeded message, that is your
router's way of saying to you: "Hey, I got a packet here, and after
decrementing TTL, TTL is zero.  I'm going to assume this packet has
been floating around the 'net forever, and simply isn't going to ever
reach it's destination."  Your router is never transmitting the packet
at that point.

> cisco-3600>traceroute 75.126.162.205
> Tracing the route to 75.126.162.205
>
>  1  *  *  *
...
> all the way to 30

  You're not even making it off your router.  It's got to be a local problem.

  Your routing table looks generally correct to me, although I'm not a
Cisco guy so I really don't know what the finer details of all that
output meant.  Perhaps you've got some firewalling or filtering or
something in place on the router that's confusing things?  Is your NAT
broken, so you're emitting packets with a bogus source address?

  What if you traceroute from a LAN host?  Is the output different?

-- Ben