Hi Again all,

I'm trying to get UDP packets to traverse a IPSEC tunnel with NAT-T.

Using IP Sec we change addresses for traffic across the Tunnel to masq the NAT connection as per http://wiki.mikrotik.com/wiki/Manual:IP/IPsec


Site 1.
IP: 172.16.10.1 - LT2P 10.0.1.9

Site 2
IP: 172.16.11.1 - LT2P 10.0.1.10

I can see traffic identify itself on either side using torch such as the clients within the network.

172.16.10.11 - 172.16.11.5

and I can get SMB, HTTP and all TCP services to work.

But it appears as if UDP traffic is not establishing some communication. So if I run a bandwidth test on UDP from router to router, I see one burst of UDP but no connection is setup and bandwidth test doesn't work. It works fine of course with TCP. What am I missing to allow UDP to traverse this link for bandwidth test and other UDP protocol requirements.

Thanks

Can we get a look at your IPSEC & NAT setup.

Regards

Andrew