Multiple IP addresses on a single NIC, one does not work

[penguinroundup]

Hi, I have added an IP address to my external NIC on my ISA2000 server (in order to publish OWA) - the external NIC has a total of 3 IP addresses assigned to it:
x.x.x.114 which is our internet connection
x.x.x.115 which is used for one of our web servers
x.x.x.116 which I just added to publish OWA

If I do an ipconfig /all on the server, I get
Ethernet adapter Internet Connection:
Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . : 0.0.0.0
Subnet Mask . . . . . . . . . . . : 0.0.0.0
IP Address. . . . . . . . . . . . : x.x.x.115
Subnet Mask . . . . . . . . . . . : 255.255.240.0
IP Address. . . . . . . . . . . . : x.x.x.114
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : x.x.x.113

Why isn't the .116 address showing up (OR why is it showing as 0.0.0.0)? I have rebooted the server, and it didn't help. I can ping the other 2 address from the server, but I can't ping the .116 address. Does it need a different subnet mask? If so, how can I figure out what it should be?

thanks for any advice.

 

[jcurtiss]

are those subnet masks right? are the addresses really on different subnets like that; with one on 255.255.255.0 and one on 255.255.240.0?