So I have L2TP setup on my MikroTik and working perfect with iphone, ipad, and windows clients. I have an Android tablet that I am having trouble with though.....

It connects just fine and authenticates but I can not pass any network traffic through the tunnel. Can't ping anything. Router log shows that it authenticates and connects and the android stays connected and does not look like it has any problems but can't access anything on the LAN......

Ideas??

I can't get my droid phone to connect using L2TP and pre-shared key.

this posting claims to have the answer

http://forum.mikrotik.com/viewtopic.php?t=67746

skip down to "Alright, got it working completly now." to bypass the commentary.