STUN connectivity issue

[mhanif]

I'm trying to configure STUN between two 7507 routers. Serial interface of each router is connecting to CNT box. I'm getting following errors.

Router serial port I'm seeing carrier transitions error and on CNT that is connecting to serial port of router I'm seeing connection drops.

Any one can help me to isolate the issue.

[pciaccio]

Keep in mind that the CNT node (assuming Channel Extenders) use HDLC for thier protocol on the Link. You may need to up the MTU size to accommodate the HDLC packet. I came across an issue where I could not pass the STUN traffic also from CNT nodes thruogh the router.Try increasing the MTU size to fit the HDLC packet. Also keep in mind that the router will also try to fragment the packets. That takes up alot of horse power from the router. This may slow your node down...