!
hostname r4
!
interface lo
 ip address 10.0.255.4/32
 ipv6 address 2001:db8:ffff::4/128
!
interface r4-eth0
 ip address 10.0.4.4/24
 ipv6 address 2001:db8:4::2:4/64
 link-params
  enable
  exit-link-params
!
interface r4-eth1
 ipv6 address 2001:db8:5::3:4/64
 link-params
  enable
  exit-link-params
!
ip forwarding
!