Objective
On the High Grade & SCALE ranges, it is not possible to operate additional IPs in bridged mode (via virtual MACs). It is therefore necessary to configure additional IPs in routed mode or via the vRack.
This guide explains how to configure the network in Proxmox VE.
Requirements
- an OVHcloud dedicated server
- access to the OVHcloud Manager
- a additional IP
No virtual MACs should be applied to additional IPs in the OVHcloud Control Panel.
Instructions
On these server ranges, there are four network cards. The first two for the public, the last two for the private network. To get all the bandwidth, aggregates must be created.
Additional IP in routed mode on public network interfaces
Target configuration schema
Explanations
You need to:
- create an aggregate
- create a bridge
- allow forwarding and add routes.
Configure the hypervisor
The entire configuration is done in the /etc/network/interfaces file:
# nano /etc/network/interfaces
auto lo
iface lo inet loopback
# public interface 1
auto ens33f0
iface ens33f0 inet manual
# public interface 2
auto ens33f1
iface ens33f1 inet manual
# private interface 1
auto ens35f0
iface ens35f0 inet manual
# private interface 2
auto ens35f1
iface ens35f1 inet manual
auto bond0
# LACP aggregate on public interfaces
# configured in DHCP mode on this example
# Has the server's public IP
iface bond0 inet dhcp
bond-slaves ens33f0 ens33f1
bond-miimon 100
bond-mode 802.3ad
post-up echo 1 > /proc/sys/net/ipv4/conf/bond0/proxy_arp
post-up echo 1 > /proc/sys/net/ipv4/ip_forward
#Private
auto vmbr0
# Configure the bridge with a private address and add route(s) to send the additional IPs to it
# A.B.C.D/X => Subnet of additional IPs assigned to the server, this can be a host with /32
iface vmbr0 inet static
address 192.168.0.1
netmask 255.255.255.255
bridge-ports none
bridge-stp off
bridge-fd 0
post-up ip route add A.B.C.D/X dev vmbr0
At this point, restart the network services or restart the server.
Configuration example of a client VM on Debian
File contents /etc/network/interfaces:
auto lo ens18
iface lo inet loopback
iface ens18 inet static
address ADDITIONAL_IP
netmask 255.255.255.255
gateway 192.168.0.1
Additional IP via vRack
Requirements
- a public block of IP addresses in your account, with a minimum of four addresses
- your chosen private IP address range
- a vRack-compatible server
- a vRack service activated in your account
- access to the OVHcloud Manager
Target configuration schema
Explanations
You need to:
- create an aggregate
- create a bridge connected to the aggregate
Configure a usable IP address
For vRack, the first, penultimate, and last addresses in a given IP block are always reserved for the network address, network gateway, and network broadcast respectively. This means that the first usable address is the second address in the block, as shown below:
46.105.135.96 # Reserved: network address
46.105.135.97 # First usable IP
46.105.135.98
46.105.135.99
46.105.135.100
46.105.135.101
46.105.135.102
46.105.135.103
46.105.135.104
46.105.135.105
46.105.135.106
46.105.135.107
46.105.135.108
46.105.135.109 # Last usable IP
46.105.135.110 # Reserved: network gateway
46.105.135.111 # Reserved: network broadcast
To configure the first usable IP address, you must edit the network configuration file as shown below. In this example, we use a subnet mask of 255.255.255.240.
The subnet mask used in this example is appropriate for our IP block. Your subnet mask may differ depending on the size of your block. When you purchase your IP block, you will receive an email notifying you of the subnet mask to use.
Configure the hypervisor
The entire configuration is done in the /etc/network/interfaces file:
# nano /etc/network/interfaces
What matters here is the bond1 and vmbr1 configuration:
auto lo
iface lo inet loopback
# public interface 1
auto ens33f0
iface ens33f0 inet manual
# public interface 2
auto ens33f1
iface ens33f1 inet manual
# private interface 1
auto ens35f0
iface ens35f0 inet manual
# private interface 2
auto ens35f1
iface ens35f1 inet manual
auto bond0
iface bond0 inet dhcp
bond-slaves ens33f0 ens33f1
bond-miimon 100
bond-mode 802.3ad
post-up echo 1 > /proc/sys/net/ipv4/conf/bond0/proxy_arp
post-up echo 1 > /proc/sys/net/ipv4/ip_forward
auto bond1
# LACP Aggregate on private interfaces
# No IPs on it
iface bond1 inet manual
bond-slaves ens35f0 ens35f1
bond-miimon 100
bond-mode 802.3ad
#Private
auto vmbr1
# Bridge connected to bond1 aggregate
# No need for IP
iface vmbr1 inet manual
bridge-ports bond1
bridge-stp off
bridge-fd 0
At this point, restart the network services or restart the server.
Configuration example of a client VM on Debian
File contents /etc/network/interfaces:
auto lo ens18
iface lo inet loopback
iface ens18 inet static
address 46.105.135.97
netmask 255.255.255.240
gateway 46.105.135.110