Re: [mpls-linux-general] Help me to understand

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

He is pointing out a bug that removing a MPLS iptables entry will not stop
traffic from flowing on the LSP (until the route cache entry expires)

On Wed, Oct 27, 2004 at 04:46:54PM +0200, windtim@libero.i wrote:
> Hi James,
>             i'm reading mail on the mailing list and i've not understood =
your
> answer to one (Antonio Mancuso 11/8/03):=20
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D
>  Hello,=20
>  on my test network I noticed a strange bahaviour
>  regarding MPLS traffic.
> =20
>  Here my problem:
> =20
>  Host A: 192.168.10.10   ------------>    Host B: 192.168.10.20
> =20
> =20
>  On host A:
>  - mplsadm2 -A -O 0
>    Key: 0x00000385
>    Out Segment add: Success
> =20
>  - mplsadm2 -O 0x385 -o push:gen:170:set:tap0:ipv4:192.168.10.20
>    Out Instr: Success
> =20
>  - more /proc/net/mpls_out
>    0x00000385 0/0/0 1 PUSH(gen 170) SET(tap0,192.168.10.20)
> =20
>  Now if I do, from A: ping 192.168.10.20 on B I receive normal ethernet p=
acket
>  and that"s fine.
> =20
>  - iptables -t mangle -A OUTPUT -d 192.168.10.20 -j MPLS --set-key 0x385
> =20
>  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)
> =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
> =20
>  on host B I still receive MPLS packet marked with 170 as label
>  and
> =20
>  - more /proc/net/mpls_out
>    0x00000385 183/15372/0 2 PUSH(gen 170) SET(tap0,192.168.10.20)
> =20
>  the counter continue to go up.
> =20
> What's the strange thing? He first time set host A to give packets to hos=
t B
> with MPLS label 0x7, after remove this setting but there is outgoing labe=
l space
> setted yet.
> Can you help me to understand?
>=20
>=20
>=20
> ____________________________________________________________
> Libero ADSL: navighi gratis a 1.2 Mega, senza canone e costi di attivazio=
ne.=20
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>=20
>=20
>=20
>=20
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--=20
James R. Leu
jl...@mi...