Re: [Accel-ppp-users] discarding message with invalid tid 0

[Alarig Le L. <al...@sw...>]

On ven.  5 oct. 12:53:58 2018, Guillaume Nault wrote:
> Well, the tunnel is not established yet, but it has been allocated and
> associated with the 5-tuple of the original SCCRQ. Given that a SCCRP
> message has been set, accel-ppp now expects a SCCCN message from the
> client and that message must contain a valid Tunnel ID.

>From what I see in the capture, I don’t see any SCCCN from the peer.
https://bulbizarre.swordarmor.fr/garbage/documents/l2tp-lns.pcap

> The "discarding message with invalid tid 0" may comes from a
> retransmission of the original SCCRQ, which is rightfully ignored.
> If it comes from a SCCCN message then you will probably need to enable
> the "dir300_quirk" l2tp option, but I would be really surprised if that
> was the issue.
> 
> Most likely, either the LAC does not receive the SCCRP, or the LNS
> (accel-ppp) does not receive the SCCCN. Do you have some filtering
> involved?

I don’t have any filtering on my side. And if I do a tcpdump on the
interface where the BGP is done with the peer, I see the exact same
packets, just two of them are inverted.
https://bulbizarre.swordarmor.fr/garbage/documents/l2tp-bgp.pcap

> > [l2tp]
> > verbose=1
> > dictionary=/usr/share/accel-ppp/l2tp/dictionary
> > mppe=deny
> > dataseq=prefer
> Not related to your problem, but I would advise to disable sequencing
> on the data channel unless you really have a good reason for it.

I deleted it.

> The incoming message triggering the "discarding message with invalid tid 0"
> error is not shown in this capture. Could you send a more complete one? Or
> even a full pcap?

The pcap are in inline answers bottom.

-- 
Alarig