[j-nsp] icmp-tunneling not working?

Cydon Satyr cydonsatyr at gmail.com
Fri Jun 12 08:51:51 EDT 2015


There was no no-propagate-ttl configured. After several hours of
troubleshooting, I finally reloaded both boxes (12.3R6.6). After that it
just worked...

Well, bummer

On Wed, Jun 10, 2015 at 6:57 AM, Amos Rosenboim <amos at oasis-tech.net> wrote:

> Hello,
> Did you confirm your P routers DO NOT have the no-propagate-ttl configured?
> Amos
> Sent from my iPhone
> On 10 Jun 2015, at 02:48, Cydon Satyr <cydonsatyr at gmail.com> wrote:
> So I have a simple bgp-free core network, and one CE router is trying to do
> traceroute to another one over mpls. Two of my middle P routers don't reply
> back to traceroute.
> I have icmp tunneling configured in my whole network. So it's global IP,
> one mpls label.
> In fact I can see running a wireshark that both P routers receive a mpls
> packet with ttl=1 but looks like they don't do normal "icmp-tunneling"
> procedure and simply drop the packet.
> What's more is that in another part of the network (path going over
> different set of P and PE routers) this works just fine, yet I fail to see
> any difference in config which could explain the failing behavior.
> This is a testing topology with a mix of M320s and MX, but I could see why
> a customer would like an explanation of why he doesn't see proper
> traceroute.
> Before I reload both of my P routers, could anyone suggest what could be
> the issue?
> Regards
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