특정 네트워크끼리 논리적인 연결을 구성함으로서 마치 직접 연결된 인터페이스로 인식 시키는 기술. 여기서는 총 4개의 터널 연결을 구성한다.
tunnel 12 : A00A Lo 0 - A10A Lo 0
tunnel 22 : A00B Lo 0 - A10A Lo 0
tunnel 13 : A00A Lo 0 - A20A Lo 0
tunnel 23 : A00B Lo 0 - A20A Lo 0
A00A
interface Tunnel12
ip address 192.168.111.65 255.255.255.252
tunnel source 203.172.100.129
tunnel destination 204.172.100.161
interface Tunnel13
ip address 192.168.121.65 255.255.255.252
tunnel source 203.172.100.129
tunnel destination 206.172.100.161
ip address 192.168.111.65 255.255.255.252
tunnel source 203.172.100.129
tunnel destination 204.172.100.161
interface Tunnel13
ip address 192.168.121.65 255.255.255.252
tunnel source 203.172.100.129
tunnel destination 206.172.100.161
A00B
interface Tunnel22
ip address 192.168.111.69 255.255.255.252
tunnel source 205.172.100.129
tunnel destination 204.172.100.161
interface Tunnel23
ip address 192.168.121.69 255.255.255.252
tunnel source 205.172.100.129
tunnel destination 206.172.100.161
A10A
interface Tunnel12
ip address 192.168.111.66 255.255.255.252
tunnel source 204.172.100.161
tunnel destination 203.172.100.129
interface Tunnel22
ip address 192.168.111.70 255.255.255.252
tunnel source 204.172.100.161
tunnel destination 205.172.100.129
A20A
interface Tunnel13
ip address 192.168.121.66 255.255.255.252
tunnel source 206.172.100.161
tunnel destination 203.172.100.129
interface Tunnel23
ip address 192.168.121.70 255.255.255.252
tunnel source 206.172.100.161
tunnel destination 205.172.100.129
interface Tunnel22
ip address 192.168.111.69 255.255.255.252
tunnel source 205.172.100.129
tunnel destination 204.172.100.161
interface Tunnel23
ip address 192.168.121.69 255.255.255.252
tunnel source 205.172.100.129
tunnel destination 206.172.100.161
A10A
interface Tunnel12
ip address 192.168.111.66 255.255.255.252
tunnel source 204.172.100.161
tunnel destination 203.172.100.129
interface Tunnel22
ip address 192.168.111.70 255.255.255.252
tunnel source 204.172.100.161
tunnel destination 205.172.100.129
A20A
interface Tunnel13
ip address 192.168.121.66 255.255.255.252
tunnel source 206.172.100.161
tunnel destination 203.172.100.129
interface Tunnel23
ip address 192.168.121.70 255.255.255.252
tunnel source 206.172.100.161
tunnel destination 205.172.100.129
정상적으로 터널링 연결이 되었다면, 기존에 BGP를 통해 Lo 0로 핑을 보낸것과 달리 터널로 직접 핑을 보낼 수 있다. 핑 테스트를 꼭 해보자.
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