[Asterisk-Users] Re: Asterisk and network problems

[barry at osvoip.net]

Wilson Pickett <spamsucks2005 at gmail.com> wrote:

> About 10 days ago, I started seeing message where ALL providers and phones
> would become "UNREACHABLE" for about 10 seconds, then the same packagae of
> messages saying they were now REACHABLE. This happens about every 20-60
> minutes, usually at least once every two hours or so.
>
> When this UNREACHABLE messages begins, ALL network data flow stops. If I
> am in ssh session, it looks like a disconnect, but about 10 secs later, I
> have the console again.
>
> I have tried the following debug techniques:
>
> 1) watched traffic on another box connected to same router and see same
> problem (ping stops)
> 2) swapped out router - problem persisted
> 3) changed eth0 card
> 4) swapped DSL phone filter and disconnected other extension
> 5) did a tcpdump and caught a freeze but see nothing unusual in the
> traffic
>

So most likely the problem is upstream.

Try running a traceroute either every minute from a cron job or every few
seconds from a script. This should identify the hop at which traffic is
failing.

Hope that helps.