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

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Date:	Mon, 05 Feb 2007 12:07:39 -0500
From:	Vlad Yasevich <vladislav.yasevich@...com>
To:	Steve Hill <steve.hill@...logic.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

Hi Steve

Steve Hill wrote:
> Vlad Yasevich wrote on 05 February 2007 16:39:
> 
>> Once you start simulating the network failure, how long do you wait?
>>
>> If you have not changed rto_max and path_max_retrans, you can end up
>> waiting quite a while for the full path switchover.  This will also
>> severely slow down your retransmissions...
> 
> I'm waiting several minutes, and I'm using setsockopt() to set the
> timeouts fairly low:
> 	srto_initial = 1000ms
> 	srto_min = 200ms
> 	srto_max = 1400ms
> 	spp_pathmaxrxt = 2
> 	spp_hbinterval = 1000ms

Ok, thanks for the info.  Two more questions:

  1. What did you set the sinfo_timetolive to?
  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'

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

Thanks
-vlad

> 
> The network's round trip time (indicated by ping) is on the order of
> <0.25ms.
> 
>  - Steve Hill
>    Software Engineer
>    Dialogic
>    Fordingbridge, Hampshire, UK
>    +44-1425-651392
>    steve.hill@...logic.com
> 

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