Make a permanent route change to a specific IP through a specific interface

Question

I have a setup where I use a 10G bond to work with a remote system, but it intermittently gets disconnected, as traffic will occasionally be routed over another interface. I think I have the problem solved with the following routing for 192.168.0.31:

    Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.1.1     0.0.0.0         UG    1      0        0 nm-bond
0.0.0.0         192.168.1.1     0.0.0.0         UG    90000  0        0 eno2
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 eno2
192.168.0.0     0.0.0.0         255.255.254.0   U     1      0        0 nm-bond
192.168.0.0     0.0.0.0         255.255.254.0   U     90000  0        0 eno2
192.168.0.31    0.0.0.0         255.255.255.255 UH    0      0        0 nm-bond

Seems to work so far. Is there a better approach? How do I make this permanent?

I have tried many variations of this netplan file: 01-network-manager-all.yaml

# Let NetworkManager manage all devices on this system
network:
    version: 2
    renderer: NetworkManager
    ethernets:
            nm-bond:
                addresses:
                    - 192.168.0.1/23
                routes:
                    - to: 192.168.0.31
                      via: 0.0.0.0
                      metric: 0

Probably the basic principal of converting the route -n table item to a netplan entry is where my problem is. Still learning...

Actually, my end goal is to have all traffic to/from the internet to use eno2 and intranet to use nm-bond. I have port forwarding on my router to forward https to the IP address assigned to eno3.

score 0 · Answer 1 · answered Apr 20 '20 at 08:31

You can create persistent static routes with netplan.
See some examples:
https://netplan.io/examples#using-multiple-addresses-with-multiple-gateways
Also see : https://askubuntu.com/a/992641/77093

For your use case this should look like this:

network:
  version: 2
  renderer: networkd
  ethernets:
    eno2:
     addresses:
       - 192.168.1.x/24
     [ ... ]

    nm-bond:
     addresses:
       -  192.168.0.x/24
     [ ... ]
     routes:
       - to: 192.168.0.31/32
         via: 0.0.0.0
     [ ... ]

Make a permanent route change to a specific IP through a specific interface

1 Answers1