udptunnel: added support for net.ipv6.bindv6only = 0

[andrew-aladjev]

Maintainer: @jandelgado
Environment: any OpenWRT version

Description:

Hello, I've added support to net.ipv6.bindv6only = 0 for udptunnel. It allows udptunnel to work correctly on systems with IPv6. I don't know how much time is required for upstream to apply my PR.

Many people are complaining about address is already in use here and 8, 9, 12, 13.

My PR is here. Can you please add it as separate patch for udptunnel and release new openwrt patch version for this package? Thank you.

I am going to prepare a pull request for openwrt in the next 10 minutes.

[andrew-aladjev]

Sorry, I've opened the openwrt udptunnel version and found that it is ancient maybe it is udptunnel from 1999. It supports only IPv4. Closing this ticket.

[andrew-aladjev]

PS I've added here my fork with important patches and cmake + cpack. If you will accept my fork instead of ancient version of updtunnel from http://www.cs.columbia.edu/~lennox/udptunnel than I can provide a PR for it. Thank you.