[AusNOG] SRV Records

[Peter Lawler]

On 15/07/14 18:41, ANSA SERVERS wrote:

> So what exactly are these SRV records and what are they used for

One thing they're used for: http://wiki.xmpp.org/web/SRV_Records

iirc from my XMPP hacking days (some time ago now so things are a little 
scratchy), blocking SRV was a cheap and nasty yet effective way (to 
attempt) to block a number of Instant Messaging services without having 
to bother with all that fiddly stuff 'lower' down. As I say, iirc, a 
number of people with 'your software sucks' errors turned out to be 
campuses where SRV wasn't passed.

(random bonus thought via bugger all coffee) No idea if blocking SRV 
will kill things evolved out of those protocols that required them which 
may be of some business benefit over 'basic' IM (eg Google Talk->Google 
Hangouts). I guess YMMV depending on what you use your network for.

Pete.