[ASK] running openvpn server on port udp 53 - windows 2008

ewwink

hello,

i cannot run openvpn server on port 53 (UDP) because that port already used, is there solution for this and my server is windows 2008 r2.

thanks

mmiller

In Server mode, OpenVPN does have limited port-sharing capabilities. Read up on the --port-share directive. Unfortunately for your usage, it seems to only work with TCP (and was designed to work in conjunction with an HTTPS proxy server). Beyond that I've not heard of two programs actively listening to the same port; but I don't see why incoming UDP on a given port couldn't be "tee"'d to two PIDs.

Can you perhaps explain a little more about what you are trying to do? In general port 53 is a system port reserved for DNS. You can run netstat with Windows to look at what PID is binding to that socket.

Hopefully someone more knowledgeable than I will pipe in.

maikcat

port 53/udp is used by dns services...

why do you want to use specific port 53 anyway?

Michael.

ewwink

running "netstat -abo" and got

 UDP    0.0.0.0:53             *:*	 808	SharedAccess	[svchost.exe]

I want to use udp port 53 to bypass my very expensive ISP quota and that port always online even if out of quota. I've tried to stop "DNS Client" service but it cannot be stopped. is there way to change dns service port?

maikcat

dns client service is your dns resolver,

the dns server service is what you want to stop..

if you have active directory enabled,keep in mind that AD needs dns server to work
properly...

ps:if they use quota,they probably use application packet filters as well,so they might notice that
you use udp traffic but not dns queries...

Michael.