'routes that do not correlate with the network' alert for ISA 2006?

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When booting up ISA 2006, I get the following alert.

Description: ISA Server detected routes through the network adapter Internet Top
NIC that do not correlate with the network to which this network adapter
belongs. When networks are configured correctly, the IP address ranges included
in each array-level network must include all IP addresses that are routable
through its network adapters according to their routing tables. Otherwise valid
packets may be dropped as spoofed. The following ranges are included in the
network's IP address ranges but are not routable through any of the network's
adapters: 172.16.255.255-172.16.255.255;. Note that this event may be generated
once after you add a route, create a remote site network, or configure Network
Load Balancing and may be safely ignored if it does not re-occur.

My Internal Netowrk (bottom NIC) is configured for 172.16.0..0 - 172.16.0.255.

The 'Top NIC' is my external NIC, configured for a routable external ip address.

I don't understand how 172.16.255.255 can have a 'route' thru the Top NIC - or
how to resolve this Alert.
--
Thanks in advance, Les Caudle
.

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