Hi Jeff,

With cable modem you probably get dynamic IP address from the ISP provider, you need to configure couple of things in the firewall.

First , are you connecting the outside interface of pix stright to cablemodem ethernet port , any other outers in bewteen like a liksys , either or you still need configure the pix with these few lines, make sure your outside interface speed transmission is set to auto detect.

conect to pix either via console of tenlet.

pix>enable

cofig t

ip address outside dhcp retry 10

global (outside) 1 interface

nat (inside) 1 0.0.0.0 0.0.0.0 0 0

once you have enter this configuration

do "show interface" to see if outside interface has obtained dynanic IP address write down the ip address, if you are successfull then you need to place a defaul

route in pix .

e.g

route outside 0.0.0.0 0.0.0.0 x.x.x.x 1

where x is the outside interface IP address.

if you get this far you still need to implement few access list to get outbound traffic, but 1st try the above configuration to see if you get dynamic public ip for outside interface.

HTH

Jorge