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642 CHAPTER 44: CONFIGURING GRE
b Configure the IP address of Ethernet0 interface.
[RouterA-Serial0] exit
[RouterA] interface ethernet 0
[RouterA-Ethernet0] ip address 10.110.24.1 255.255.255.0
c Create a virtual Tunnel interface and configure the IP address, source address
and destination address.
[RouterA-Ethernet0] exit
[RouterA] interface tunnel 0
[RouterA-Tunnel0] ip address 1.1.1.1 255.255.255.0
[RouterA-Tunnel0] source 10.1.1.1
[RouterA-Tunnel0] destination 20.1.1.2
d Configure the routes to 20.1.1.0 network and 30.110.1.0 network.
[RouterA] ip route-static 20.1.1.0 255.255.255.0 serial 0
[RouterA] ip route-static 30.110.1.0 255.255.255.0 tunnel 0
3 Configure Router B:
a Configure the IP address of Serial0.
[RouterB] interface serial 0
[RouterB-Serial0] ip address 20.1.1.2 255.255.255.0
b Configure the IP address of Ethernet0 interface.
[RouterB-Serial0] exit
[RouterB] interface ethernet 0
[RouterB-Ethernet0] ip address 30.110.1.1 255.255.255.0
c Create a virtual Tunnel interface, and configure the IP address, source address
and destination address.
[RouterB-Ethernet0] exit
[RouterB] interface tunnel 0
[RouterB-Tunnel0] ip address 1.1.1.2 255.255.255.0
[RouterB-Tunnel0] source 20.1.1.2
[RouterB-Tunnel0] destination 10.1.1.1
d Configure the routes to 20.1.1.0 network and 30.110.1.0 network.
[RouterB] ip route-static 10.1.1.0 255.255.255.0 Serial 0
[RouterB] ip route-static 10.110.24.0 255.255.255.0 tunnel 0
4 Configure Router C:
a Configure the IP address of Serial0 interface.
[RouterC] interface serial 0
[RouterC-Serial0] ip address 10.1.1.2 255.255.255.0
[RouterC-Serial0] interface serial 1
[RouterC-if-Serial1] ip address 20.1.1.1 255.255.255.0
Application of
IPX-over-IP GRE
The two subnets group1 and group2 that running Novell IPX protocol need to set
up a virtual private network across a LAN using GRE technology.