Determine IP Address of Router

Hi,



I have an iSeries (i5, iBM I, AS/400.etc.) behind a cable modem. The
cable modem is what connects me to the internet and serves as the initial
firewall and as the network router.



Ever so often the IP address of the modem/router changes. That is.if a
power outage occurs or other things happen beyond my control.the IP address
of the cable modem changes.



I am trying to think of a way I can determine, from my IBM I (As/400,
iSeries, i5, etc.), what the new IP address of that cable modem is.



I was trying to think if maybe there might be a PHP or java solution that I
could call from the iSeries to poll that cable modem to retrieve the current
outside IP address.



Any suggestions on how to accomplish that or if it is even possible?



Thanks!



Shannon O'Donnell