hostname r4
interface r4-eth0
 ip address 10.0.21.1/24
 ipv6 address 2001:db8:1:2::1/64
!
interface r4-eth1
 ip address 10.0.11.2/24
 ipv6 address 2001:db8:2:2::2/64
!
interface lo
 ip address 10.254.0.4/32
 ipv6 address 2001:db8:F::4/128
!
