netdev - RE: [Lksctp-developers] Fw: Intermittent SCTP multihoming breakage

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Date:	Mon, 5 Feb 2007 12:26:14 -0500
From:	"Steve Hill" <steve.hill@...logic.com>
To:	"Vlad Yasevich" <vladislav.yasevich@...com>
Cc:	<netdev@...r.kernel.org>,
	<lksctp-developers@...ts.sourceforge.net>,
	"Sridhar Samudrala" <sri@...ibm.com>
Subject: RE: [Lksctp-developers] Fw: Intermittent SCTP multihoming breakage

Vlad Yasevich wrote on 05 February 2007 17:08:

>   1. What did you set the sinfo_timetolive to?

I presume you mean the timetolive parameter of sctp_sendmsg()? - this
was set to 1400ms (as previously mentioned, this was in error but it
does appear to have highlighted a problem with the stack itself).

>   2. What specific netfilter rule to do use to simulate
> network outage?
>      I was using '-t filter -A INPUT -i eth0 -p sctp -j DROP'

iptables -A INPUT -d 192.168.2.0/24 -p sctp -j DROP

> Just trying to get more info to simulate this.  My prior attempts
> recovered quickly with my patch.

I usually (but not always - sometimes it happens on the first attempt)
have to add and remove the iptables rule a few times while running
traffic over the association in order to reproduce the problem.  I'm
running traffic at a rate of around 500 data chunks per second.  Each
data chunk has a 44 octet payload.

The script I'm using to toggle the iptables rule is below:

----------
#!/bin/sh

net="$1"

flush() {
	iptables -F
	echo "Flush"
	exit
}

trap flush EXIT

while true; do
	iptables -A INPUT -d "$net" -p sctp -j DROP
	echo "set"
	sleep 5
	iptables -F
	echo "flushed"
	sleep 5
done 
----------

 - Steve Hill
   Software Engineer
   Dialogic
   Fordingbridge, Hampshire, UK
   +44-1425-651392
   steve.hill@...logic.com
-
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