Nick, I'm terminating all tunnels in the encap.txt to a 2651xm and making back end tunnels to jnos for my ip-rf bridge. The 1721 can handle a few tunnels (300 is the interface limit), but not the entire encap list. I wrote a perl script that will convert the encap.txt into a router config, but I wouldn't try it on anything less than a 2600 (due to config size limitations), and a 2651xm preferably for performance reasons. Let me know if you are interested in the script (its still pretty rough). I'd like to see your AUX config for slip. I'm running my tunnels as ipip instead of nos, I don't know if there is a reason to still use nos. Jason - KY9J