Re: [Openvpn-users] Re: Answering on the same interface where the request came from

[Jamie L. <ja...@sh...>]

James Yonan wrote:
> Listening on multiple sockets is also bad from a performance perspective 
> unless you are using a modern polling API such as epoll on Linux 
> 2.6.

That's only an issue if you have lots of interfaces.
If you only have a few, poll() will be fine.

But, if you're going to have a little non-portability, it's much
easier to use the IP_PKTINFO method of getting the incoming
destination address and interface (IP_PKTINFO with recvmsg/sendmsg).

That has the advantage that you don't need to enumerate the
interfaces, and you don't need to track interface changes: you can
just use the received pktinfo struct for sending out the same
interface, without interpreting it.

-- Jamie