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

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Ale_Devite
Posts: 2
Joined: 2018/09/17 13:13:57

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

Post by Ale_Devite » 2018/09/17 13:18:46

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


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