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Bridging or routing IP address over a GRE tunnel? - RESOLVED
linuxthefish
Member
I have 2 servers. Server A has 2 IP's routed to it by my provider, and server B has 1 IP routed to it by my provider.
Server A has 185.61.221.146 (main IP) and 185.238.173.172. Server B has IP address 185.32.145.253
I want to be able to access server B via server A's external IP 185.238.173.172, with traffic going over the GRE tunnel.
I've setup a GRE tunnel between the 2 servers like so:
Server A
root@A:~# echo 'net.ipv4.ip_forward=1' >> /etc/sysctl.conf root@A:~# sysctl -p root@A:~# ip tunnel add gre1 mode gre local 185.61.221.146 remote 185.32.145.253 ttl 255 root@A:~# ip addr add 192.168.1.1/24 dev gre1 root@A:~# ip link set gre1 up root@A:~# ping 192.168.1.254 PING 192.168.1.254 (192.168.1.254) 56(84) bytes of data. 64 bytes from 192.168.1.254: icmp_req=1 ttl=64 time=8.56 ms 64 bytes from 192.168.1.254: icmp_req=2 ttl=64 time=8.64 ms 64 bytes from 192.168.1.254: icmp_req=3 ttl=64 time=8.57 ms
Server B
[root@B ~]# echo 'net.ipv4.ip_forward=1' >> /etc/sysctl.conf [root@B ~]# sysctl -p [root@B ~]# ip tunnel add gre1 mode gre local 185.32.145.253 remote 185.61.221.146 ttl 255 [root@B ~]# ip addr add 192.168.1.254/24 dev gre1 [root@B ~]# ip link set gre1 up [root@B ~]# ping 192.168.1.1 PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data. 64 bytes from 192.168.1.1: icmp_req=1 ttl=64 time=8.51 ms 64 bytes from 192.168.1.1: icmp_req=2 ttl=64 time=8.59 ms 64 bytes from 192.168.1.1: icmp_req=3 ttl=64 time=8.58 ms
I then added server A's 2nd IP to the gre1 interface on server B:
[root@B ~]# ip addr add 185.238.173.172 dev gre1
And added routes for that IP, to the other server's gre1 IP:
root@A:~# ip route add 185.238.173.172 via 192.168.1.254 [root@B ~]# ip route add 185.238.173.172 via 192.168.1.1
And confirmed I can ping 185.238.173.172 from both ends:
root@A:~# ping 185.238.173.172 PING 185.238.173.172 (185.238.173.172) 56(84) bytes of data. 64 bytes from 185.238.173.172: icmp_req=1 ttl=64 time=8.87 ms 64 bytes from 185.238.173.172: icmp_req=2 ttl=64 time=8.88 ms [root@B ~]# ping 185.238.173.172 PING 185.238.173.172 (185.238.173.172) 56(84) bytes of data. 64 bytes from 185.238.173.172: icmp_seq=1 ttl=64 time=0.027 ms 64 bytes from 185.238.173.172: icmp_seq=2 ttl=64 time=0.022 ms
Now I wish to get external connectivity to 185.238.173.172 going to server B. How can I do this?
Running a traceroute shows traffic reaching server A, but I then need to route traffic to server B.
Packets Pings Host Loss% Snt Last Avg Best Wrst StDev 1. xxx.137.xxx.x 0.0% 11 0.1 0.1 0.1 0.1 0.0 2. xxx.137.xxx.x 0.0% 11 0.1 0.1 0.1 0.1 0.0 3. 83.231.235.253 0.0% 11 1.2 2.5 1.2 12.1 3.2 4. 5.158.213.46 0.0% 11 1.3 1.6 1.2 2.8 0.6 5. ??? 6. 185.61.221.146 0.0% 11 1.2 1.2 1.2 1.3 0.0 7. ???
Is this possible?
Comments
Also willing to paypal $100 to anyone who can figure this out
my game just start. I will reply you later $100 is mine.
On Server B:
Should work.
Works perfectly thanks! Forgot about the return route whoops.
Let me know your paypal email in PM on IRC
$100 received, thanks.
You just got served, son.
already uninstall game ：（
:P