Hi Conrad, On Thu, Jun 23, 2016 at 06:49:19PM +0200, Conrad Hoffmann wrote: > Hi, > > attached is my shot at supporting negotiating UDP message sizes > 512 bytes > in the Haproxy DNS implementation. The default DNS size of 512 bytes can > often lead to truncated responses, which are discarded. > > With the attached patch and adding "udp_msg_size 2048" to my resolvers > section, I can succesfully use a hostname that yields ~100 A records in our > company network, something that did not work before. > > This was an approach suggested by Baptiste a long time ago, unfortunately I > got distracted with other things for a while. Nevertheless, I'd also like > to discuss > > a) whether this is really a sufficient replacement for DNS over TCP support > b) why truncated responses are immediately discarded, even if they contain > one or more records that satisfy the original request > > But such discussion could optionally be moved to a seperate thread.
Thanks for this, it indeed sounds useful and could be even more useful once we manage to setup a backend using DNS responses. I'm having one question though : what would be the impact of enabling this all the time, I mean without the configuration directive ? willy
