Date: Thu, 5 Jan 2012 12:48:05 +0200 From: Sami Halabi <sodynet1@gmail.com> To: Gleb Smirnoff <glebius@freebsd.org> Cc: freebsd-net@freebsd.org Subject: Re: ng_mppc_decompress: too many (4094) packets dropped, disabling node Message-ID: <CAEW%2BogYLToV4dtW=Y-yQvY1C_YdbqQfEnr87F8dt%2BF57FxZgkw@mail.gmail.com> In-Reply-To: <20120105095855.GI34721@glebius.int.ru> References: <CAEW%2Bogbn6jizawgLCHCcTLMSmdjCKFvPkJa33jrJ5AAnjww=fg@mail.gmail.com> <20111227044754.GK8035@FreeBSD.org> <CAEW%2BogY_iHUb=n=G45d5U_r5XfD39YDwgNkowu1QN%2BeWL5K5Fw@mail.gmail.com> <20111227083503.GP8035@glebius.int.ru> <CAEW%2BogYHtvPFqMAM17_fHWzvKAiSqEOyQ3dtQRwmD6DJSHsrEA@mail.gmail.com> <20120105095855.GI34721@glebius.int.ru>
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Hi,
there is a problem whith this script:
# ngctl ls | awk '{ if ($4 == "l2tp") print $6}'
ngctl: send msg: No buffer space available
Sami
2012/1/5 Gleb Smirnoff <glebius@freebsd.org>
> Sami,
>
> I'm trying to reproduce a reordering problem with a new node, and
> I've found that:
>
> 1) PPTP uses sequencing, that would not pass out of sequence datagram
> to the PPP, and thus to MPPE.
> 2) L2TP uses sequencing optionally, so the problem in subject may
> appear only on an L2TP link with disabled sequencing.
>
> I wonder how often L2TP is running w/o sequencing control. Can you
> please run this script on your mpd box to estimate?
>
> #!/bin/sh
>
> IDS=$(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
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