What do you mean by „i could ping the ips less then 1ms“ and „not going through on on a vm“?
Common mistakes are for example:
- The MTU must be set explicitly to properly work. This means, your bridge should have the mtu set, in order to automatically adapt that setting on containers. For vm’s you have to set it explicitly (or to 1, which has the special meaning of „adapt from interface“).
- Firewall issues. Proxmox allows by default outgoing traffic. Incoming traffic must be allowed. So you have to allow incoming gre traffic. The general effects of firewalls on each container/vm still apply (as long as enabled).
- The routing setting must be enabled on the proxmox host (aka ip_forward).
I dont know mikrotik, so i realy dont understand what you mean/did with „mikrotik setup“. Maybe this Tutorial could help you out https://community.noez.de/t/noez-de-community-tutorial-gre-tunnel/1689. It is in german, but the text is quite simple. So, deepl could help you out?