Re: [mpls-linux-general] unknown protocol

[James R. L. <jl...@mi...>]

On Wed, Jun 20, 2001 at 09:49:08AM +0530, nomit kalidhar wrote:
> Hello
> 
> I had set up a LSP between two nodes as given in the example. The were
> corresponding entries in corresponding mpls_in etc .. files also. When i
> telnet from one of these terminals to another i get a message saying:
> mpls_output unknown protocol.
> Is this consistent with the LSP that was setup. Why is this happening ?

It is more of a warning then anything else.  Is it only happening when you send
TCP packets (telnet or FTP) and not ICMP (ping) packets?  The Linux
IP stack is an odd beast, it is a little over optimised in someplace
to the point that it isn't always consitent in setting the state of a packet
when it is sent to the 'output' funtions.  This message is indicating that
the IP stack didn't mark it's packet as being an IP packet, so when the MPLS
stack gets it it cannot copy the TTL from the IP header into the shim.
A default TTL is used instead.  I need to dig through the IP code to figure
out which senerios lead to this condition.

Jim

> 
> With regards
> 
> Nomit
> 
> 
> 
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-- 
James R. Leu