Configure an IP Address on an Interface router(config)#interface ethernet0 router(config-if)#ip address 192.168.4.2 255.255.255.0 router(config-if)#no shutdown Set the Default Gateway (quick): router(config)#ip route 0.0.0.0 0.0.0.0 192.168.4.1 -------------------------------------------------------------------------------- IP Routing - Gateway of Last Resort http://www.cisco.com/warp/public/105/default.html The gateway of last resort is simply the most preferred default route known by the router. The ip default-gateway command differs from the other two commands. It should only be used when ip routing is disabled on the Cisco router. Unlike the ip default-gateway command, you can use ip default-network when ip routing is enabled on the Cisco router. When you configure ip default-network the router considers routes to that network for installation as the gateway of last resort on the router. For every network configured with ip default-network, if a router has a route to that network, that route is flagged as a candidate default route. ip route 0.0.0.0 0.0.0.0 Creating a static route to network 0.0.0.0 0.0.0.0 is another way to set the gateway of last resort on a router. As with the ip default-network command, using the static route to 0.0.0.0 is not dependent on any routing protocols. However, ip routing must be enabled on the router. router(config)#ip route 0.0.0.0 0.0.0.0 192.168.4.1 Use the ip default-gateway command when ip routing is disabled on a Cisco router. Use the ip default-network and ip route 0.0.0.0 0.0.0.0 commands to set the gateway of last resort on Cisco routers that have ip routing enabled. The way in which routing protocols propagate the default route information varies for each protocol. -------------------------------------------------------------------------------- Cisco DNS Configuration DNS servers: 10.12.20.53 10.12.30.51 primary domain name: local.lan search domains: linux.lan Configure DNS: router#configure terminal router(config)#ip domain-lookup router(config)#ip name-server 10.12.20.53 router(config)#ip name-server 10.12.30.51 router(config)#ip domain-name local.lan router(config)#ip domain-list linux.lan router(config)#^Z router#write memory The domain-name command sets the primary domain name associated with your device. This domain name will be added to relatively qualified names (host name only searches) when performing DNS queries. The domain-list command allows additional domain names to be searched with DNS queries.