Re: [mpls-linux-general] [again] right behaviour?

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

On Mon, Aug 11, 2003 at 12:29:12PM +0200, Antonio Mancuso wrote:
> Hello,
> I am resending this message since I had problem with my email server
> I have lost all the email and may be any answer to this.
> So please excuse me!
> Thank you.
> 
> ==================================================
> Hello,
> on my test network I noticed a strange bahaviour
> regarding MPLS traffic.
> 
> Here my problem:
> 
> Host A: 192.168.10.10   ------------>    Host B: 192.168.10.20
> 
> 
> On host A:
> - mplsadm2 -A -O 0
>   Key: 0x00000385
>   Out Segment add: Success
> 
> - mplsadm2 -O 0x385 -o push:gen:170:set:tap0:ipv4:192.168.10.20
>   Out Instr: Success
> 
> - more /proc/net/mpls_out
>   0x00000385 0/0/0 1 PUSH(gen 170) SET(tap0,192.168.10.20)
> 
> Now if I do, from A: ping 192.168.10.20 on B I receive normal ethernet packet
> and that's fine.
> 
> - iptables -t mangle -A OUTPUT -d 192.168.10.20 -j MPLS --set-key 0x385
> 
> Now, as expected, on B I receive MPLS packet marked with 170 as label.
> - more /proc/net/mpls_out
>   0x00000385 70/5880/0 2 PUSH(gen 170) SET(tap0,192.168.10.20)
> 
> Now If I remove the iptables entry in this way:
> - iptables -t mangle -D OUTPUT -d 192.168.10.20 -j MPLS --set-key 0x385
> 
> on host B I still receive MPLS packet marked with 170 as label
> and
> 
> - more /proc/net/mpls_out
>   0x00000385 183/15372/0 2 PUSH(gen 170) SET(tap0,192.168.10.20)
> 
> the counter continue to go up.
> 
> 
> So, do you think this is a right behaviour?
> If yes, how can I stop host A to sending MPLS packets without removing the
> mpls key in /proc/net/mpls_out, but just acting on iptables?

No this is not the correct behavior.  My guess is that there is a stale
cache entry in the route cache.  It should probably be flushed when adding/
removing entries from iptables.

Can you head over to sf.net/projects/mpls-linux/ and file a bug?

Thanks

> 
> Thnx,
> Antonio Mancuso
> ==================================================
> 
> 
> 
> 
> 
> 
> 
> 
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-- 
James R. Leu