udp associate support

[mjc-]

It appears that UDP connections over ocproxy aren't supported, looking at the code, it appears to be intentional. Curious how straightforward this would be to add. If it's expected to be straightforward, but not something anyone else needs, I could have a go at trying to add support and submitting a PR for it.

Thanks!

[cernekee]

I thought about adding it a while back, but never really had a use case (other than DNS, which is handled internally).

[patelbhavesh]

First of all thanks for this wonderful utility it made life easier to separate traffic.
As mosh.org is getting more popular the use case would be that it uses TCP to make ssh connection and then uses UDP for further communications
https://mosh.org/#faq
So supporting UDP would be pretty cool

[XL64]

It may also help for Kerberos that uses UDP packets as I understand.

[lfourquaux]

tunsocks ( https://github.com/russdill/tunsocks ) supports udp, but it's not packaged by debian.