/ # ping 192.168.4.2 PING 192.168.4.2 (192.168.4.2): 56 data bytes 64 bytes from 192.168.4.2: seq=0 ttl=62 time=3.644 ms 64 bytes from 192.168.4.2: seq=1 ttl=62 time=7.362 ms 64 bytes from 192.168.4.2: seq=2 ttl=62 time=3.554 ms 64 bytes from 192.168.4.2: seq=3 ttl=62 time=3.654 ms 64 bytes from 192.168.4.2: seq=4 ttl=62 time=3.574 ms --- 192.168.4.2 ping statistics --- 5 packets transmitted, 5 packets received, 0% packet loss round-trip min/avg/max = 3.554/4.357/7.362 ms / # traceroute 192.168.4.2 traceroute to 192.168.4.2 (192.168.4.2), 30 hops max, 46 byte packets 1 10.0.0.1 (10.0.0.1) 1.149 ms 1.144 ms 1.063 ms 2 1.1.1.2 (1.1.1.2) 3.049 ms 3.751 ms 1.721 ms 3 192.168.4.2 (192.168.4.2) 2.876 ms 3.201 ms 2.826 ms / # ping 192.168.4.2 PING 192.168.4.2 (192.168.4.2): 56 data bytes 64 bytes from 192.168.4.2: seq=0 ttl=61 time=9.979 ms 64 bytes from 192.168.4.2: seq=1 ttl=61 time=5.306 ms 64 bytes from 192.168.4.2: seq=2 ttl=61 time=8.230 ms 64 bytes from 192.168.4.2: seq=3 ttl=61 time=4.963 ms 64 bytes from 192.168.4.2: seq=4 ttl=61 time=7.786 ms --- 192.168.4.2 ping statistics --- 5 packets transmitted, 5 packets received, 0% packet loss round-trip min/avg/max = 4.963/7.252/9.979 ms / # traceroute 192.168.4.2 traceroute to 192.168.4.2 (192.168.4.2), 30 hops max, 46 byte packets 1 10.0.0.1 (10.0.0.1) 1.079 ms 0.978 ms 0.875 ms 2 1.1.1.10 (1.1.1.10) 1.878 ms 2.529 ms 1.820 ms 3 1.1.1.5 (1.1.1.5) 4.696 ms 4.186 ms 3.769 ms 4 192.168.4.2 (192.168.4.2) 4.442 ms 9.486 ms 5.144 ms R1 1.1.1.8/30 dev eth1 proto kernel scope link src 1.1.1.9 10.0.0.0/24 dev eth2 proto kernel scope link src 10.0.0.1 127.0.0.0/8 dev lo proto kernel scope link src 127.0.0.1 172.16.8.0/24 via 1.1.1.10 dev eth1 proto zebra metric 1 192.168.4.0/24 via 1.1.1.10 dev eth1 proto zebra R2 1.1.1.4/30 dev eth1 proto kernel scope link src 1.1.1.5 10.0.0.0/24 via 1.1.1.6 dev eth1 proto zebra 127.0.0.0/8 dev lo proto kernel scope link src 127.0.0.1 172.16.8.0/24 via 1.1.1.6 dev eth1 proto zebra metric 1 192.168.4.0/24 dev eth2 proto kernel scope link src 192.168.4.1 R3 1.1.1.4/30 dev eth0 proto kernel scope link src 1.1.1.6 1.1.1.8/30 dev eth1 proto kernel scope link src 1.1.1.10 10.0.0.0/24 via 1.1.1.9 dev eth1 proto zebra metric 1 127.0.0.0/8 dev lo proto kernel scope link src 127.0.0.1 172.16.8.0/24 dev eth2 proto kernel scope link src 172.16.8.1 192.168.4.0/24 via 1.1.1.5 dev eth0 proto zebra metric 1 R1 configure set interfaces ethernet eth0 address 1.1.1.1/30 set interfaces ethernet eth1 address 1.1.1.9/30 set interfaces ethernet eth3 address 10.0.0.1/30 set protocols bgp 65531 neighbor 1.1.1.2 remote-as '65532' set protocols bgp 65531 neighbor 1.1.1.2 update-source 1.1.1.1 set protocols bgp 65531 parameters router-id 1.1.1.1 set protocols bgp 65531 neighbor 1.1.1.10 remote-as '65533' set protocols bgp 65531 neighbor 1.1.1.10 update-source 1.1.1.9 set protocols bgp 65531 parameters router-id 1.1.1.10 set protocols bgp 65531 network 10.0.0.0/24 commit save exit R2 configure set interfaces ethernet eth0 address 1.1.1.2/30 set interfaces ethernet eth1 address 1.1.1.5/30 set interfaces ethernet eth2 address 192.168.4.1/24 set protocols bgp 65532 neighbor 1.1.1.1 remote-as '65531' set protocols bgp 65532 neighbor 1.1.1.1 update-source 1.1.1.2 set protocols bgp 65532 parameters router-id 1.1.1.2 set protocols bgp 65532 neighbor 1.1.1.6 remote-as '65533' set protocols bgp 65532 neighbor 1.1.1.6 update-source 1.1.1.5 set protocols bgp 65532 parameters router-id 1.1.1.6 set protocols bgp 65532 network 192.168.4.0/24 commit save exit R3 configure set interfaces ethernet eth0 address 1.1.1.6/30 set interfaces ethernet eth1 address 1.1.1.10/30 set interfaces ethernet eth3 address 172.16.8.1/24 set protocols bgp 65533 neighbor 1.1.1.9 remote-as '65531' set protocols bgp 65533 neighbor 1.1.1.9 update-source 1.1.1.10 set protocols bgp 65533 parameters router-id 1.1.1.10 set protocols bgp 65533 neighbor 1.1.1.5 remote-as '65532' set protocols bgp 65533 neighbor 1.1.1.5 update-source 1.1.1.6 set protocols bgp 65533 parameters router-id 1.1.1.6 set protocols bgp 65533 network 172.16.8.0/24 commit save exit PC1 cat /etc/network/interfaces auto eth0 iface eth0 inet static address 10.0.0.2 netmask 255.255.255.0 gateway 10.0.0.1 PC2 cat /etc/network/interfaces auto eth0 iface eth0 inet static address 192.168.4.2 netmask 255.255.255.0 gateway 192.168.4.1 PC3 cat /etc/network/interfaces auto eth0 iface eth0 inet static address 172.16.8.2 netmask 255.255.255.0 gateway 172.16.8.1