Network disappears in ZAP

When I repower my cable modem, ZAP goes through its network detection as usual but in addition to my isp connection, it sets up a network with isp 192.168.100.0 but when I go to the "zones" seciont in ZAP, it only shows the one connection for my isp. The second connection with the local ip does not get shown. It just dissappears.
Is this normal or has my firewall been compromised somehow by a trojan?
I am running XP with a single NIC and a cable modem with ZAP, no router.

 

I don't think it is a problem. 192.168.x.x is not an internet routable IP address.
I would cold reboot (power down) the computer and check ZAP again. Sometimes when you cycle the cable modem the ip will change. I think that affects ZAP as well. If it still is there after reboot, and you still have your ISP Zone, then you could delete the additional zone. Watch it occasionally and see if it does it again. I had similar types of things happen in the past.

 

Using a port monitor, I see the following;

ip address 192.168.100.2
gateway 0.0.0.0
dhcp ip 192.168.100.1

This only shows for a second or two while the cable modem reboots, then dissappears.

Under IP routing table I get this;

Forw. Dest. IP Subnet mask Next Hop IP

192.168.100.0 255.255.255.0 192.168.100.2
192.168.100.2 255.255.255.255 127.0.0.1
192.168.100.255 255.255.255.255 192.168.100.2
224.0.0.0 240.0.0.0 192.168.100.2
255.255.255.255 255.255.255.255 192.168.100.2

This may be all totally normal but if not Id like to know.

Thanks,

David