Re: [mpls-linux-devel] About mpls-packet to ip-packet process

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

Just to make sure I understand what you're trying to do:

You want to get hooked into the PREROUTE netfilter chain for packets
coming to a LER from MPLS.  To do this the normal 'pop peek' instructions
should work just.  If you want to 'force' the trasistion from MPLS to
IPv4 for packets coming to a LER from MPLS you can use the 'deliver'
instruction on the associated ILM.

On Thu, May 01, 2008 at 10:44:42AM +0000, =?GB2312?B?wfXA2iA8b3JwaGVuX2xlaWxpdUBtc24uY29tPg==?= wrote:
> 
> I was follow the example of "IPv4 over MPLS: two LER example for mpls-linux-1.95x".
> Do you means I have to change the "mpls nhlfe add key 0 instructions nexthop eth3 ipv4 192.168.1.4
> (returns key 0x2)" to "mpls nhlfe add key 0 instructions deliver nexthop eth3 ipv4 192.168.1.4
> (returns key 0x2)" ?
> 
> ----------------------------------------
> > Date: Wed, 30 Apr 2008 21:16:22 -0500
> > From: jl...@mi...
> > To: @mindspring.com
> > CC: mpl...@li...
> > Subject: Re: [mpls-linux-devel] About mpls-packet to ip-packet process
> >
> > Hmm. I think you are looking at the PHP code. Take a look at
> > the 'deliver' instruction. It will show you that packets destined from
> > IPv4 may be configured to go through 'ip_rcv' which will result in
> > the packet travesing all of the IPv4 netfilter hooks.
> >
> > On Wed, Apr 30, 2008 at 03:56:51AM +0000, =?GB2312?B?wfXA2iA8b3JwaGVuX2xlaWxpdUBtc24uY29tPg==?= wrote:
> >>
> >> Hi all:
> >> I found that the packet which from ip stack to mpls stack in the ip_finish_output2 had passed POSTROUTING hook in netfilter.
> >> BUT the packet from mpls stack to ip stack just use neighbour->output, which NOT hook in PREROUTING in netfilter.
> >>
> >> In this way, if I do SNAT for ip packet and send into mpls stack, will NOT do Un-SNAT for the reply packet.
> >>
> >> Is my understand right? How to solved it?
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> >
> > --
> > James R. Leu
> > jl...@mi...
> 
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-- 
James R. Leu
jl...@mi...