# Re: Socket.getaddrinfo and IPSocket.getaddress super slow? **URL:** \ **Category:** Ruby\ **Created:** [September 12, 2008, 11:42pm UTC](https://www.ruby-forum.com/t/re-socket-getaddrinfo-and-ipsocket-getaddress-super-slow/148450 "2008-09-12T23:42:58Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![stickstone](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/6f9a4e/32.png) [@stickstone](https://www.ruby-forum.com/u/stickstone)\ **Post date:** [September 12, 2008, 11:42pm UTC](https://www.ruby-forum.com/t/re-socket-getaddrinfo-and-ipsocket-getaddress-super-slow/148450/1 "2008-09-12T23:42:58Z")
> Anyone know why Socket.getaddrinfo and IPSocket.getaddress take up to 3 > seconds to return when the host doesn’t have a record in DNS? They seem to do reverse DNS lookups on occasions where you might not want them to (e.g. finding the IP address to which a socket is bound). Try adding to the top of your program: require ‘socket’ Socket.do\_not\_reverse\_lookup=true ---
**Author:** ![stickstone](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/6f9a4e/32.png) [@stickstone](https://www.ruby-forum.com/u/stickstone)\ **Post date:** [September 13, 2008, 12:02am UTC](https://www.ruby-forum.com/t/re-socket-getaddrinfo-and-ipsocket-getaddress-super-slow/148450/2 "2008-09-13T00:02:00Z")
Brian C. wrote: > > Anyone know why Socket.getaddrinfo and IPSocket.getaddress take up to 3 > > seconds to return when the host doesn’t have a record in DNS? > > They seem to do reverse DNS lookups on occasions where you might not > want > them to (e.g. finding the IP address to which a socket is bound). Try > adding > to the top of your program: > > require ‘socket’ > Socket.do\_not\_reverse\_lookup=true The Zeroconf (avahi) mDNS service seems to pretty well bone things up on Ubuntu 7/8 as well. You might want to shut it off and see what happens (it seems to be running by default) you’re hanging out with zoo critters.