SNM:255.255.255.252
R1 S0/0/0:109.234.10.129
R2 S0/0/0:109.234.10.130

Router>enable
Router#config terminal
Router(config)#interface s0/0/0
Router(config-if)#ip address 109.234.10.129 255.255.255.252
Router(config-if)#clock rate 64000
Router(config-if)#ip route 0.0.0.0 0.0.0.0 109.234.10.130
Router(config-if)#no shutdown
ctrl+z

what do you mean configure the gigabit interface for a lan? same deal as fast ethernet