ip forwarding
!debug nhrp all
interface nhs3-eth0
 ip address 192.168.1.3/24
!
ip route 192.168.2.0/24 192.168.1.6
nhrp nflog-group 1
interface nhs3-gre0
 ip address 172.16.1.3/32
 no link-detect
 ipv6 nd suppress-ra
 ip nhrp holdtime 10
 ip nhrp network-id 42
 ip nhrp registration no-unique
 ip nhrp redirect
 tunnel source nhs3-eth0
!
ip route 10.4.4.0/24 172.16.1.4
ip route 10.5.5.0/24 172.16.1.5