Cannot access VM from another VM via SSH

[Nixtis]

Hello everyone,

I have been looking for a response since 2 days and didn't found any help yet.

I have a Proxmox 5 with a node. Inside this node I have a VM and a CT with both Ubuntu 16.04. Both VM and CT are configured with IP Fail over from OVH, everything is ok. I can access to my apps from outside and I can connect via SSH to both via any computer. But they can't connect via SSH to each other. They can ping correctly but no SSH. I need them to comunicate via SSH because I need to transfert some files via SCP.

Did I forgot something ?

They are both networked by the default OVH vmbr0

VM 1 :

# 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

auto eth0
iface eth0 inet static
address XXX.XXX.XXX.XXX
netmask 255.255.255.252
network XXX.XXX.XXX.XXX
broadcast XXX.XXX.XXX.XXX
gateway XXX.XXX.XXX.XXX
dns-nameservers XXX.XXX.XXX.XXX

CT 1 (use host dns) :

auto lo
iface lo inet loopback
iface lo inet6 loopback

# interfaces(5) file used by ifup(8) and ifdown(8)
# Include files from /etc/network/interfaces.d:
source-directory /etc/network/interfaces.d

auto eth0
iface eth0 inet static
address XXX.XXX.XXX.XXX
netmask 255.255.255.252
gateway XXX.XXX.XXX.XXX

I really don't know what's wrong. Everything works fine... I can access via SSH from my computer but The both VM/CT cannot each other.

 

[manu]

if the 2 machine can ping each, check that the ssh port is open with a port scanner

from machine A

nmap -p ssh IP_of_machine_B