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Posted by christian maier on June 20, 2009, 5:54 am
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I have a very strange problem with 2 cisco routers connected over layer 2 cisco switches (catalyst 6500). Both routers are connected over a VLAN and they see each others IP- and MAC-address in the arp cache (they can ping each other). But when I traceroute from one to the other, I see a an additional hop * * * before I see the ip-address of the other end (this happens on both routers). Also when I mirror the switchports where the routers are connected, I only see traceroute udp packets with TTL=2. I do not see the TTL=1 packets, because of this strange internal hop. This causes big problems with HSRP, because HSRP has TTL=1. And this first hop is this internal hop, so HSRP packets never come to the switch (and not to the other router). Any ideas? Thanks. Christian | |||||||||||||
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Posted by Christian Maier on July 5, 2009, 12:05 am
Please log in for more thread options This blocked UDP with TTL=1. | |||||||||||||
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>
> I have a very strange problem with 2 cisco routers connected over
> layer 2 cisco switches (catalyst 6500).
> Both routers are connected over a VLAN and they see each others
> IP- and MAC-address in the arp cache (they can ping each other).
> But when I traceroute from one to the other, I see a an additional hop
> * * * before I see the ip-address of the other end (this happens on both
> routers). Also when I mirror the switchports where the routers
> are connected, I only see traceroute udp packets with TTL=2.
> I do not see the TTL=1 packets, because of this strange internal hop.
> This causes big problems with HSRP, because HSRP has TTL=1.
> And this first hop is this internal hop, so HSRP packets
> never come to the switch (and not to the other router).
>
> Any ideas?
>
> Thanks.
>
> Christian
>