interface r4-eth0
 ip address 10.1.1.4/24
!
ip route 10.2.1.0/24 10.1.1.3
interface r4-gre0
 ip address 10.255.255.4/32
 no link-detect
 ipv6 nd suppress-ra
exit
interface r4-eth1
 ip address 192.168.4.4/24
!
ip route 0.0.0.0/0 10.255.255.2