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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