Hi Steve
would you mind terribly, changing the -d "$net" to the
-i "$net", and run the script with the interface name instead?
The reason is, that I see 2 different behaviors between blocking
by interface and blocking by IP and would like to find out if
you see it too.
When I block at the interface ( -i eth1 in my case), I see
the path failover happen and flow if resumed.
When I block at the ip address, I see the path failover
in an odd state. It looks like it happened, but the flow is
not resumed. Receive still doesn't get traffic. I think I might
be running a buggy receiver, but I am not 100% sure. In my
case, the sender if running 2.6.10-rc7 and receiver is running
Ubuntu 2.6.17-10.
I'll try running against a different receiver as well.
-vlad
Steve Hill wrote:
> 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
> [EMAIL PROTECTED]
>
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