I have a cable connection to the internet and having difficulty understanding what is happening with my WAN IP address. Please note I'm not using the correct IPs here.
When I connect my Cisco PIX 515 firewall to the Cable Modem (via the outside interface) the IP address reported for the outside interface is 82.39.xx.xx.
However if I replace the PIX firewall with a Linksys Cable/DSL Router connected to the cable modem the WAN IP is reported as 82.39.yy.yy.
Where xx.xx and yy.yy are different.
I thought that the outside interface of the PIX would pickup the same IP address as reported by the Linksys router, I.e. the WAN IP address.
What am I missing here?