|Are the routers on the same subnet. If so you may have to setup a routing table for which gateway each subnet is on. Use the ROUTE command at the command prompt.|
Assuming Network A is...
Router is 10.10.10.1
and Network B is...
Router is 10.10.10.2
then use this command...
route add 10.10.11.0 mask 255.255.255.0 10.10.10.1 -p
route add 10.10.12.0 mask 255.255.255.0 10.10.10.2 -p
Hope this helps. We would need more info to help you further. My guess is that the routers are on different subnets being that you are using two NICs. If that is the case then you can specify the NIC in your rout add command.
Manipulates network routing tables.
ROUTE [-f] [-p] [-4|-6] command [destination]
[MASK netmask] [gateway] [METRIC metric] [IF interface]
-f Clears the routing tables of all gateway entries. If this is
used in conjunction with one of the commands, the tables are
cleared prior to running the command.
-p When used with the ADD command, makes a route persistent across
boots of the system. By default, routes are not preserved
when the system is restarted. Ignored for all other commands,
which always affect the appropriate persistent routes. This
option is not supported in Windows 95.
-4 Force using IPv4.
-6 Force using IPv6.
command One of these:
PRINT Prints a route
ADD Adds a route
DELETE Deletes a route
CHANGE Modifies an existing route
destination Specifies the host.
MASK Specifies that the next parameter is the 'netmask' value.
netmask Specifies a subnet mask value for this route entry.
If not specified, it defaults to 255.255.255.255.
gateway Specifies gateway.
interface the interface number for the specified route.
METRIC specifies the metric, ie. cost for the destination.
All symbolic names used for destination are looked up in the network database
file NETWORKS. The symbolic names for gateway are looked up in the host name
database file HOSTS.
If the command is PRINT or DELETE. Destination or gateway can be a wildcard,
(wildcard is specified as a star '*'), or the gateway argument may be omitted.
If Dest contains a * or ?, it is treated as a shell pattern, and only
matching destination routes are printed. The '*' matches any string,
and '?' matches any one char. Examples: 157.*.1, 157.*, 127.*, *224*.
Pattern match is only allowed in PRINT command.
Invalid MASK generates an error, that is when (DEST & MASK) != DEST.
Example> route ADD 126.96.36.199 MASK 188.8.131.52 184.108.40.206 IF 1
The route addition failed: The specified mask parameter is invalid.
(Destination & Mask) != Destination.
> route PRINT
> route PRINT -4
> route PRINT -6
> route PRINT 157* .... Only prints those matching 157*
> route ADD 220.127.116.11 MASK 255.0.0.0 18.104.22.168 METRIC 3 IF 2
destination^ ^mask ^gateway metric^ ^
If IF is not given, it tries to find the best interface for a given
> route ADD 3ffe::/32 3ffe::1
> route CHANGE 22.214.171.124 MASK 255.0.0.0 126.96.36.199 METRIC 2 IF 2
CHANGE is used to modify gateway and/or metric only.
> route DELETE 188.8.131.52
> route DELETE 3ffe::/32