Take the 2-minute tour ×
Server Fault is a question and answer site for professional system and network administrators. It's 100% free, no registration required.

This question has been merged

I have 4 machines

machine 1 have ip address 172.13.0.40/24 machine 2 have two ip address 172.13.0.1/24 and 172.12.0.1/24 machine 3 have two ip address 172.12.0.50/24 and 172.17.0.1/24 machine 4 have ip address 172.17.0.30/24

machine 2 and 3 have NAT on both ways

we can ping from machine machine 1 to machine 4 and vice versa

I need a tunnel 10.0.0.0/25 to be formed between machine 1 and 4

I used following commands

ip tunnel add gtt0001 mode gre remote 172.13.0.40 local 172.17.0.30 ttl 255 dev eth1

ip link set gtt0001 up

ip addr add 10.0.0.0/24 broadcast 10.0.0.255 dev gtt0001

ip link set gtt0001 multicast on

ifconfig gtt0001 10.0.0.21 netmask 255.255.255.0 

ip route add 172.13.0.0/24 dev gtt0001

similar commands on machine 4

But I cannot ping 10.0.0.21 from machine 4 and vice versa

share

merged by sysadmin1138 Jul 17 '11 at 14:40

this question was merged with Unable to ping through gre tunnel because it is an exact duplicate of that question.

    
possible duplicate of Unable to ping through gre tunnel –  user48838 Jul 16 '11 at 11:12

Browse other questions tagged or ask your own question.