Direct network between two servers in vRack?

I have two servers in vRack. I'm beginning to suspect I am not doing the network setup as it should be done. I have just copied and modified the /etc/network/interfaces since year 2012, when vRack was older version.

Now I have tried to create direct network between the two dedicated servers, after I noticed the connection seems to be bandwith limited to 500 Mbit/sek.. I tried this following instructions in
https://docs.ovh.com/gb/en/dedicated/configuring-vrack-on-dedicated-servers/

That guide does not mention vmbr. I'm running Proxmox on those dedicated servers, I believe I need vmbr for the virtual hosts. I have two IP address blocks in this vRack.

Here is my current /etc/network/interfaces, from two hosts.
Host rauta:
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# for Routing
auto vmbr1
iface vmbr1 inet manual
post-up /etc/pve/kvm-networking.sh
bridge_ports dummy0
bridge_stp off
bridge_fd 0

# Pasi 2016-11-07
# vmbr0: vRack, Nettipertti-blokki, virtuaalikoneille interfeissiksi
auto vmbr0
iface vmbr0 inet static
address 58.36.42.196
netmask 255.255.255.0
network 58.36.42.0
broadcast 58.36.42.255
gateway 58.36.42.222
bridge_ports eth1
bridge_stp off
bridge_fd 0
# vRack, Antenniserveri-blokki
post-up /sbin/ip route add 34.42.245.64/26 dev vmbr0
post-up /sbin/ip route flush cache

# IPV6 vRackissa
iface vmbr0 inet6 static
address 1003:140d:1008:091a::
netmask 64
post-up /sbin/ip -f inet6 route add 1003:140d:1008:09ff:ff:ff:ff:ff dev vmbr0
post-up /sbin/ip -f inet6 route add default via 1003:140d:1008:09ff:ff:ff:ff:ff
pre-down /sbin/ip -f inet6 route del default via 1003:140d:1008:09ff:ff:ff:ff:ff
pre-down /sbin/ip -f inet6 route del 1003:140d:1008:09ff:ff:ff:ff:ff dev vmbr0


auto eth0
iface eth0 inet static
address 41.233.187.26
netmask 255.255.255.0
network 41.233.187.0
broadcast 41.233.187.255
gateway 41.233.187.254

#Interface vRackiin, tehdään IP:t toiseen rautakoneen suuntaan
auto eth1
iface eth1 inet static
address 192.168.19.26
netmask 255.255.255.0



The other host:
# network interface settings; autogenerated
# Please do NOT modify this file directly, unless you know what
# you're doing.
#
# If you want to manage parts of the network configuration manually,
# please utilize the 'source' or 'source-directory' directives to do
# so.
# PVE will preserve these directives, but will NOT read its network
# configuration from sourced files, so do not attempt to move any of
# the PVE managed interfaces into external files!

auto lo
iface lo inet loopback

iface enp103s0f0 inet manual

#Interface vRackiin, tehdään IP:t toiseen rautakoneen suuntaan
auto enp103s0f1
iface enp103s0f1 inet manual

#Ei toimi, koska enp103s0f1 on jo bridgessä
#auto vmbr5
#iface vmbr5 inet static
# address 192.168.19.115
# netmask 255.255.255.0
# bridge_ports enp103s0f1
# bridge_stp off
# bridge_fd 0



auto vmbr0
iface vmbr0 inet static
address 15.77.12.115/24
gateway 15.77.12.254
bridge_ports enp103s0f0
bridge_stp off
bridge_fd 0

# Taleman 2019-02-28
# Pohjana Pasin tekemä 2016-11-07
auto vmbr1
iface vmbr1 inet static
address 58.36.42.212
netmask 255.255.255.224
network 58.36.42.192
broadcast 58.36.42.223
gateway 58.36.42.222
bridge_ports enp103s0f1
bridge_stp off
bridge_fd 0
# vRack, Antenniserverin blokki
post-up /sbin/ip route add 34.42.245.64/26 dev vmbr0
post-up /sbin/ip route flush cache

# IPV6 vRackissa
iface vmbr0 inet6 static
address 1003:140d:1008:091a::
netmask 64
post-up /sbin/ip -f inet6 route add 1003:140d:1008:09ff:ff:ff:ff:ff dev vmbr0
post-up /sbin/ip -f inet6 route add default via 1003:140d:1008:09ff:ff:ff:ff:ff
pre-down /sbin/ip -f inet6 route del default via 1003:140d:1008:09ff:ff:ff:ff:ff
pre-down /sbin/ip -f inet6 route del 1003:140d:1008:09ff:ff:ff:ff:ff dev vmbr0