For most configurations, there are only three commands to enter on the router. You’ll first need to telnet to the router’s existing internal IP (192.168.254.254) and run the following command:

remote list

This will show a bunch of configurations, the info we’re looking for right now is where it says

INFORMATION FOR <REMOTE_NAME>

for the block of info with the current Remote and Source IPs. The name is the name of the remote section that we will need later.

Now, enter the following commands:

remote setsrcipaddr NEW_IP_ADDR SUBNET_MASK REMOTE_NAME
remote setrmtipaddr NEW_GATEWAY SUBNET_MASK REMOTE_NAME
save all

NEW_IP_ADDR will be 216.223.231.X where X is the current last number of your IP address. SUBNET_MASK is still the same, 255.255.255.192 and NEW_GATEWAY is 216.223.231.Y where Y is your current gateway.

Now do a

remote list <REMOTE_NAME>

and make sure that the Source and Remote IPs are correctly changed. Then when you’re sure all the changes have taken, type

reboot

Cancel your telnet session and wait a bit then try to reconnect to the router, you should be able to within a minute or so.