Bind9 vs. Bind8 latency

Kevin Darcy kcd at daimlerchrysler.com
Wed Sep 21 22:17:21 UTC 2005


Jeff Wark wrote:

>I have recently been switching our name servers over to bind9 on debian Sarge from bind8 on 
>Debian woody.
>
>I like the idea of running the 9 series of bind for security reasons and having the option 
>of views [once I get used to it].
>
>There does seem to be a problem with my bind9 configuration and I'm not sure where to start 
>looking.  When I do a host lookup on the bind8 server for a host I have not already cached 
>the response comes back almost immediately but when I do it on a bind9 server it can take 
>several seconds most of the time.  Once I have looked a host up once it answers quickly for 
>subsequent queries.
>
>Basically initial queries on bind9 seem very slow compared to the older bind8.  Any ideas as 
>to why this might be?  Both setups are fairly generic with the only changes to the configs 
>being the zones that they are authoritative for [same on each server].
>
Maybe your firewall is choking on EDNS probes? A tcpdump might be useful.

                                                                         
                                          - Kevin




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