From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Dumazet <eric.dumazet@gmail.com>
Subject: Re: timer expiry check at icmp.c in ipv6
Date: Mon, 16 Jul 2012 16:33:37 +0200
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To: BALAKUMARAN KANNAN <balakumarank@tataelxsi.co.in>
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On Mon, 2012-07-16 at 13:44 +0000, BALAKUMARAN KANNAN wrote:
> Dear all,
> 
> In kernel-3.0.26 code net/ipv6/icmp.c, while sending ICMP reply where
> it checks for the timer expiry. It should check the value given by a
> router advertisement. I think the expiry value is stored in
> rt->rt6_expires in ndisc.c (line no: 1284). Then while sending an ICMP
> reply, it should check with the expiry timer right? Where that check
> is happening? Please somebody explain me.
> 
> Thank you.

Its probably done in net/ipv6/ip6_fib.c

fib6_gc_timer_cb() -> fib6_run_gc()

Every 30 seconds.

(you can change /proc/sys/net/ipv6/route/gc_interval )