Hey,
I’m searching for some help. The scenario:
Datacenter A: VYOS Host
Datacenter B: Debian 7.x Host
Both Hosts are connected successfully with GRE-Tunnel:
tunnel tun0 {
address 192.168.10.1/30
description “GRE Tunnel”
encapsulation gre
local-ip 185.a.a.a
multicast enable
remote-ip 84.b.b.b
}
I can ping on each side 192.168.10.1 <=> 192.168.10.2 - Working!
Next Step: /27 Subnet (Internet IP-Block, no internal) in DC A I’d like to ‘tunnel’ to Datacenter B Host. The Subnet: 72.16.1.0/27
I add on Vyos:
vyos@gre-router# show protocols static
route 72.16.1.0/27 {
next-hop 192.168.10.2 {
}
}
And on Debian Host:
ip route add 72.16.1.0/27 via 192.168.10.1 dev greW0
When I know add a single IP on Debian Host, like:
ip addr add 72.16.1.2/27 dev greW0
I can ping ->only<- from VYOS HOST 72.16.1.2 but it’s not external available. When I make ping from Debian Host to Gateway, I get loop:
root@host1:~# ping 72.16.1.1
PING 72.16.1.1 (72.16.1.1 56(84) bytes of data.
From 192.168.10.1: icmp_seq=1 Redirect Host(New nexthop: 192.168.10.2)
From 192.168.10.1: icmp_seq=2 Redirect Host(New nexthop: 192.168.10.2)
From 192.168.10.1: icmp_seq=3 Redirect Host(New nexthop: 192.168.10.2)
So it’s like a loop.
Need help 
Please