On 16 December 2015 at 08:55, Masataka Ohta <mohta@xxxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > Sorry, browser is just an example and any application using domain > names can support SRV to avoid default port numbers contaminated by > ALGs. See below for examples of mail and name applications. Friends of SRV should read https://tools.ietf.org/html/draft-lear-httpbis-svcinfo-rr-01 a) if we add SRV to browsers, we need to do +3 DNS lookup per resource 'for ever', SRVINFO will allow for 1 ultimately. In transition phase 3 is needed for any solution. But new protocol, like HTTP2 could be good driver for new DNS RR. b) it can announce all the transport protocols you're supporting (that is, migration to new L4 does not add another DNS query, and migration to new HTTP/SSH version is made easy) -- ++ytti