[dnsdist] max packet size settings?

Remi Gacogne remi.gacogne at powerdns.com
Sat Nov 19 08:03:42 UTC 2016

Hi Brooks,

On 11/18/2016 10:21 PM, Brooks Bridges wrote:
> I am currently trying to utilize dnsdist as a load balancer in front of
> multiple pdns servers with a custom backend module that we are using for
> lcr purposes.  I am running into issues where if the response packet
> from the pdns server is above a certain size, dnsdist appears to just
> drop all data, and responds with an empty reply to the requesting side.
> We are using a max packet size of 1400 on the requesting client side and
> that seems to work just fine when we query against the pdns server
> directly, however once I wedge dnsdist in the middle, it all goes to
> crap as soon as we hit about 600-750 bytes.

dnsdist should have not trouble handling responses up to 4096 bytes.
What version of dnsdist are you using? Would you mind providing a trace
showing the query and request on both sides of dnsdist, preferably as a


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