Installing and Administering LAN/9000 Software

170 Chapter6

Network Addressing

Conﬁguring Gateways on Supernets

If all the hosts and gateways in your networks support variable-length

subnet masks, then the gateway conﬁguration of the supernet will be the

same as in gateway conﬁguration for variable-length subnets.

In Figure 6-17, if you use explicit routing, you may conﬁgure the

following supernet route on Host A to enable Host A to communicate

with any host on supernet 192.6.12

ROUTE_DESTINATION[0]=”net 192.6.12”

ROUTE_MASK[0]=”255.255.254.0”

ROUTE_GATEWAY[0]=”192.6.14.2”

ROUTE_COUNT[0]=”1”

If you use dynamic routing, then the default gateway, Gd, on network

192.6.14 must have the above supernet route conﬁgured.

If some of the hosts and gateways in your networks do not support

variable-length subnet masks, then you must conﬁgure a separate

network route for each of the networks in the supernet.

If you use explicit routing and Host A does not support supernetting,

then you must conﬁgure the following two net routes on Host A.

ROUTE_DESTINATION[0]=”net 192.6.12”

ROUTE_MASK[0]=”255.255.255.0”

ROUTE_GATEWAY[0]=”192.6.14.2”

ROUTE_COUNT[0]=”1”

ROUTE_DESTINATION[1]=”net 192.6.13”

ROUTE_MASK[1]=”255.255.255.0”

ROUTE_GATEWAY[1]=”192.6.14.2”

ROUTE_COUNT[1]=”1”

If you use dynamic routing, then the default gateway, Gd, on network

192.6.14 must have the above net routes conﬁgured.