[Pdns-users] Outgoing timouts problem (?)

[Kenneth Marshall]

On Sat, Dec 04, 2010 at 12:03:05PM +0200, Nick Milas wrote:
> Hi all,
>
> I have just entered full production running, with pdns 9.22 and recursor 
> 3.3 on two servers with ldap backend (openldap replicated with syncrepl).
>
> Can someone please give some info on outgoing timeouts (which seem 
> significant)?  What do these actually mean, and if they are a real problem; 
> if so, what should I do to resolve?
>
> I found in the manual that these are: "number of timeouts on outgoing UDP 
> queries since starting". Why do I have such timeouts? What should I check?
>
> Here is an excerpt from recursor log on one server:
>
> Dec  4 11:09:09 dns2 pdns_recursor[2248]: stats: 529100 questions, 457693 
> cache entries, 5199 negative entries, 1% cache hits
> Dec  4 11:09:09 dns2 pdns_recursor[2248]: stats: throttle map: 2, ns 
> speeds: 1533
> Dec  4 11:09:09 dns2 pdns_recursor[2248]: stats: outpacket/query ratio 
> 172%, 1% throttled, 0 no-delegation drops
> Dec  4 11:09:09 dns2 pdns_recursor[2248]: stats: 845 outgoing tcp 
> connections, 2 queries running, 66140 outgoing timeouts
> Dec  4 11:09:09 dns2 pdns_recursor[2248]: stats: 217172 packet cache 
> entries, 0% packet cache hits
> Dec  4 11:09:09 dns2 pdns_recursor[2248]: stats: 0 qps (average over 1984 
> seconds)
> Dec  4 11:23:55 dns2 pdns_recursor[2248]: Refreshed . records
>
> And an excerpt from the other server log:
>
> Dec  4 11:39:03 vdns pdns_recursor[2217]: stats: 352149 questions, 49361 
> cache entries, 3405 negative entries, 21% cache hits
> Dec  4 11:39:03 vdns pdns_recursor[2217]: stats: throttle map: 3, ns 
> speeds: 675
> Dec  4 11:39:03 vdns pdns_recursor[2217]: stats: outpacket/query ratio 61%, 
> 21% throttled, 0 no-delegation drops
> Dec  4 11:39:03 vdns pdns_recursor[2217]: stats: 303 outgoing tcp 
> connections, 1 queries running, 39967 outgoing timeouts
> Dec  4 11:39:03 vdns pdns_recursor[2217]: stats: 18896 packet cache 
> entries, 63% packet cache hits
> Dec  4 11:39:03 vdns pdns_recursor[2217]: stats: 0 qps (average over 1935 
> seconds)
>
> Thanks in advance,
> Nick Milas
>

My two cents and I am certain that someone will correct me
if I am mistaken, but the outgoing timeouts are when the
remote site does not answer the DNS query soon enough for
any number of reasons, including overloaded DNS server
as well as any number of network problems. This is more
than likely all out of your control.

Cheers,
Ken