[Asterisk-Users] Asterisk and network problems

[Steve Blair]

Are all your ISP using the same upstream provider?

Wilson Pickett wrote:

> Slightly OT but if you know much about networks, please read and maybe 
> you can suggest some things.
>
> I have been running asterisk for about 1 year. Currently running 1.0.6 
> with 2 X100P and 1 TDM400P with 3 FXS modules on a Pentium III-800 
> with 512M RAM. The system performs very well for both POTS and voIP.
>
> The box is connected to a fixed ip DSL line at 2048/256.
> It registers with several SIP and IAX providers, three remote SIP 
> phones, one remote IAXy.
>
> There is often one provider or phone that will become unreachable for 
> a moment, and I'm sure this happens on most DSL soho/home type 
> connections. It isn't a problem and doesn't usually cause any symptoms 
> except perhaps very occasional breaking up.
>
> 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.
>
> Naturally, I contacted our ISP who finally saw some packet loss at the 
> same time as I saw the "freeze". They contacted their upstream who 
> didn't see any problems and now they are contacting the phone company.
>
> 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
>
> Needless to say, this condition makes voIP useless at a professional 
> level. For personal use we need to tell people that if they suddenly 
> hear silence for 10 seconds to "hold on and wait til the connection 
> comes back", not really great.
>
> While I'm waiting for the third service to check, if anyone has any 
> suggestions or ideas to pursue, please send them either on or off list.
>
> tia
>
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