Maintained by: NLnet Labs

[Unbound-users] Unbound Slow to Prime

Paul Wouters
Sun Aug 7 01:45:44 CEST 2011


On Sat, 6 Aug 2011, Alan Gutierrez wrote:

> It used to be the case that I could flush the unbound cache and then resolve a name immediately. Now there is a long delay before I start to get results. It is especially bad on Fedora 15 running in VirtualBox on OS X Lion, but I'm also seeing it slow down on Fedora 15 at EC2. I updated root.hints, but that didn't seem to help. I can't make much sense of the debugging logging output. A couple weeks ago, flushing cache or restarting, you might notice a light delay on the first lookup, but now it takes a few minutes to get results other than timeouts.
>
> server:
> 	verbosity: 2
> 	num-threads: 1
> 	interface: 127.0.0.1
> 	do-ip4: yes
> 	do-ip6: no
> 	do-udp: yes
> 	do-tcp: no

Why do you have do-tcp set to no? That will cause problems on large dnssec replies that get
truncated.

> 	use-caps-for-id: yes

You can try disabling this, some servers don't do 0x20 properly and it might be causing delays.

Paul