Tunnel Gre problem between two hosts (vps and dedicated server)

[Ale_Devite]

Hello guys i need to resolve this problem (all server have installed centos 7): i'm trying to create a gre tunnel through vps (in Italy - OpenVZ) and a dedicated server (in Germany), but they do not communicate internally (ping and ssh command tests). Next i create a gre tunnel trought vps (in Italy - OpenVZ) and vps (in France - KVM OpenStack) and their communicate, i next i had create a tunnel trought vps (in France - KVM OpenStack) and a dedicated server (in Germany) their communicate. I can not understand why the vps (in Italy - OpenVZ) and the dedicated server (in Germany) do not communicate, ideas on how I can fix (I also tried with iptables disabled, firewalld is not enable)? Thanks

1. VPS command for tunnel:

echo 'net.ipv4.ip_forward=1' >> /etc/sysctl.conf
iptunnel add gre1 mode gre local VPS_IP remote DEDICATED_SERVER_IP ttl 255
ip addr add 192.168.168.1/30 dev gre1 ip link set gre1 up

2. Dedicated server command for tunnel:

iptunnel add gre1 mode gre local DEDICATED_SERVER_IP remote VPS_IP ttl 255
ip addr add 192.168.168.2/30 dev gre1
ip link set gre1 up

[root@VPS ~]# ping 192.168.168.2
PING 192.168.168.2 (192.168.168.2) 56(84) bytes of data.
^C
--- 192.168.168.2 ping statistics ---
89 packets transmitted, 0 received, 100% packet loss, time 87999ms



[root@DE ~]# ping 192.168.168.1
PING 192.168.168.1 (192.168.168.1) 56(84) bytes of data.
^C
--- 192.168.168.1 ping statistics ---
92 packets transmitted, 0 received, 100% packet loss, time 91001ms

[root@VPS ~]# lsmod | grep gre
ip_gre 4242 -2
ip_tunnel 4242 -2 sit,ip_gre
gre 4242 -2 ip_gre



[root@DE ~]# lsmod | grep gre
ip_gre 22707 0
ip_tunnel 25163 1 ip_gre
gre 13144 1 ip_gre

 

[Rob]

I don't know much abou gre tunnels, but you could try disabling selinux (if its running) to see if it's interfering? Then, if so, you can re-enable and modify its settings.

You can check its status by entering the comand 'getenforce'. You'll see enabled, disabled or permissive. Permissive will show warnings in log files, but not block anything.

 

[Ale_Devite]

I don't know much abou gre tunnels, but you could try disabling selinux (if its running) to see if it's interfering? Then, if so, you can re-enable and modify its settings.

You can check its status by entering the comand 'getenforce'. You'll see enabled, disabled or permissive. Permissive will show warnings in log files, but not block anything.

SELinux is disabled in both machine, and the outuput of 'getenforce' = disabled (both machine)

 

[Ale_Devite]

Help?

 

[Ale_Devite]

UP