Good day!
I have 2 servers in datacenter and I want to use one of them as router for another instead of default gateway provided by DC. Both servers have one ethernet interface called 'eth0' with public IPv4 and IPv6 addresses and both servers are running Linux. Distributive isn't important, because I can use any: CentOS, Debian, Arch, OpenSUSE etc. Please help to get routing work. I understand that I can build private network with help of tunneling but it looks like overkill.
Also datacenter provides /56 routed to server 1.
Let's say that addresses are distributed as below:
server 1: 139.100.100.1/24, gw 139.100.100.254 2a01:7e00::f03c:dcff:acd0:742c/64
server 2: 139.100.100.2/24, gw 139.100.100.254 2a01:7e00::f03c:dcff:acd0:6124/64