I found this topic back in the archives, and can shed a little light on it from my testing. If you are looking to fully convert the encap.txt for use on a cisco device, you will need a 2600 or better to handle the large number of tunnels needed. I used an old encap.txt file and converted about 320 tunnels which brought a 2610 to a screeching halt. I will be testing with a 2651XM to see how results differ, hopefully I will not need to get out any of the big stuff. Below is the output of a converted line from an old encap.txt: ! interface tunnel 750190592 <--tunnel number created from converting ip to decimal description Link to 44.183.0.0 ip unnumbered loopback1 <-- using the loopback as the assigned 44 address space (could use a physical) tunnel source 99.119.146.20 tunnel destination 130.208.168.63 tunnel mode nos <-- compatible with jnos ! ip route 44.183.0.0 255.255.0.0 tunnel750190592 ! The next issue is RIP updated to jnos. I get updated sent to jnos, but it does not add them to the routing table. The error states that the routes are not from IPIP and they are domain 0. I will make the conversion script available when I get it a little more polished. Jason