[SOLVED] Unable to obtain IP Route with Proxmox on OVH

[Phobos D'thorga]

Hello!

So to make some things clear firstly, `192.99.xxx.xxx` is my Failover IP and associated subnet (`255.255.255.248`) that I'm trying to use with Proxmox on the OVH network, for which I have also already created Virtual MAC addresses for, with each being unique. This here is my `/etc/network/interfaces` configuration file: pastebin.com/P6RNWaTp

`158.xxx.xxx.21` is the main IP address to the server/hypervisor itself, with `158.xxx.xxx.254` being the supposed gateway. Yet when I run the command `ip route show dev vmbr172` or start an installer, I basically get the error that is attached to this thread.

​

What am I doing wrong? I have been pulling my hair out for days over this matter and would dearly appreciate any help, even if it's just a simple idea. I'm ready for any suggestions at this point after scouring Google multiple times. I am also using a `ISC DHCP server` but that doesn't seem to be causing any troubles, I don't think. If someone here thinks I need to upload the configuration to that then I will.

 

[Hollis]

First install must be via NAT mode, but only not in the GUI anyore! Via console:

qm set -netX <e1000|virtio|etc.>[,macaddr=MACADDR]

https://forum.proxmox.com/threads/nat-kvm.43230/#post-207880

After install edit:

~$ cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet static
        address FO-IP
        netmask 255.255.255.255
        broadcast FO-IP
        post-up route add Proxmox-GW dev eth0
        post-up route add default gw Proxmox-GW
        pre-down route del Proxmox-GW dev eth0
        pre-down route del default gw Proxmox-GW

iface eth0 inet6 static
        address A:B:C:105::yourIP
        netmask 64
        post-up /sbin/ip -f inet6 route add A:B:C:1ff:ff:ff:ff:ff dev eth0
        post-up /sbin/ip -f inet6 route add default via A:B:C:1ff:ff:ff:ff:ff
        pre-down /sbin/ip -f inet6 route del default via A:B:C:1ff:ff:ff:ff:ff
        pre-down /sbin/ip -f inet6 route del A:B:C:1ff:ff:ff:ff:ff dev eth0

 

[kotakomputer]

1. Do not use Auto Config for eth on Debian guest because the gateway not in the same network.
2. Your subnet should be 255.255.255.255 instead 255.255.255.248

 

[Phobos D'thorga]

Running a NAT is not optimal, as all the ports behind the Failover-IP need to be accessible by the world/public. Is there any other way I can do this, thank you? I appreciate the replies too

 

[kotakomputer]

As you can see the Error say: "The network autoconfiguration was SUCCESSFUL. However, no DEFAULT ROUTE was set".
You must follow set the gateway manually as I described before. Also no NAT required.

 

[Phobos D'thorga]

I still can't get the darned thing to work. Here's my configuration: https://pastebin.com/eJHSYmRz

Any further help would be greatly appreciated, thank you. I do admit to being out of my league with this stuff.

EDIT: The reason it's 255.255.255.248 is because the IP block is 192.xxx.xxx.xxx/29.

 

[Hollis]

Maybe better

Proxmox server OVH (IPv6 address M:N:OP::)
==================

~# cat /etc/network/interfaces

auto lo
iface lo inet loopback

iface eth0 inet manual

iface eth1 inet manual

auto vmbr0
iface vmbr0 inet static
        address  A.B.C.D
        netmask  255.255.255.0
        gateway  A.B.C.254
        broadcast  A.B.C.255
        bridge_ports eth0
        bridge_stp off
        bridge_fd 0
        network A.B.C0

iface vmbr0 inet6 static
        address  M:N:OP::
        netmask  64
        post-up /sbin/ip -f inet6 route add M:N:Off:ff:ff:ff:ff dev vmbr0
        post-up /sbin/ip -f inet6 route add default via M:N:Off:ff:ff:ff:ff
        pre-down /sbin/ip -f inet6 route del default via M:N:Off:ff:ff:ff:ff
        pre-down /sbin/ip -f inet6 route del M:N:Off:ff:ff:ff:ff dev vmbr0

===========================================================================================

KVM VM - FO IPv4, bridge (Debian) (my IPv6 address M:N:OP::224)
================================

~# cat /etc/network/interfaces

source /etc/network/interfaces.d/*

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
        address J:K:L:M
        netmask 255.255.255.255
        broadcast J:K:L:M
        post-up route add A.B.C.254 dev eth0
        post-up route add default gw A.B.C.254
        pre-down route del A.B.C.254 dev eth0
        pre-down route del default gw A.B.C.254

iface eth0 inet6 static
        address M:N:OP::224
        netmask 64
        post-up /sbin/ip -f inet6 route add M:N:Off:ff:ff:ff:ff dev eth0
        post-up /sbin/ip -f inet6 route add default via M:N:Off:ff:ff:ff:ff
        pre-down /sbin/ip -f inet6 route del default via M:N:Off:ff:ff:ff:ff
        pre-down /sbin/ip -f inet6 route del M:N:Off:ff:ff:ff:ff dev eth0

 

[Phobos D'thorga]

As you can see the Error say: "The network autoconfiguration was SUCCESSFUL. However, no DEFAULT ROUTE was set".
You must follow set the gateway manually as I described before. Also no NAT required.

You're brilliant! I have it working now, thank you

Thank you for your help too, Hollis!