ng_mppc_decompress: too many (4094) packets dropped, disabling node

[Sami Halabi]

Hi,
there is a problem whith this script:

# ngctl ls | awk '{ if ($4 == "l2tp") print $6}'
ngctl: send msg: No buffer space available

Sami
2012/1/5 Gleb Smirnoff <glebius at freebsd.org>

>  Sami,
>
>  I'm trying to reproduce a reordering problem with a new node, and
> I've found that:
>
> 1) PPTP uses sequencing, that would not pass out of sequence datagram
>   to the PPP, and thus to MPPE.
> 2) L2TP uses sequencing optionally, so the problem in subject may
>   appear only on an L2TP link with disabled sequencing.
>
> I wonder how often L2TP is running w/o sequencing control. Can you
> please run this script on your mpd box to estimate?
>
> #!/bin/sh
>
> IDS=$(ngctl ls | awk '{ if ($4 == "l2tp") print $6}')
> for id in $IDS; do
>        id="[$id]:";
>        sess=$(ngctl show $id | sed -En 's/.*session_([0-9a-f]+).*/\1/p');
>        ngctl msg $id getsessconfig 0x$sess
> done
>
> In my small installation I've got only a couple of L2TP clients, and both
> use sequencing, so patched code in ng_mppc won't be ever executed.
>
> Rec'd response "getsessconfig" (4) from "[11f]:":
> Args:   { session_id=0xafb6 peer_id=0x2fcf control_dseq=1 enable_dseq=1 }
> Rec'd response "getsessconfig" (4) from "[f3]:":
> Args:   { session_id=0xd34b peer_id=0x2654 control_dseq=1 enable_dseq=1 }
>
> I'd like to explicitly test the code in ng_mppc to make sure, that node
> can rekey up to 4096 times and continue operation.
>
> --
> Totus tuus, Glebius.
>



-- 
Sami Halabi
Information Systems Engineer
NMS Projects Expert