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