Score:1

Ubuntu

How to set a static ip address with a /22 subnet?

Mark Bingenheimer

1/12/24, 11:46 AM

I am trying to set a static ip address on an ubuntu server 22. It is a fresh install.

The issue I am having is I cannot access the server from a different subnet. I have tried everything I can think of. I normally am not this silly with basic networking but I am not use to the new style of netplan.

Here is my config.

# This is the network config written by 'subiquity'
network:
  ethernets:
    ens18:
      addresses: 
      - 192.168.1.80/22 
      nameservers: 
        addresses: 
        - 192.168.1.1 
        search:
        - internal.     .co
      routes:
      - to: default
        via: 192.168.1.1
  version: 2

My DHCP scope is 192.168.3.0/24. My servers live on 192.168.1.0/24.

My subnet is /22.

When I ping from 192.168.3.100 I get no response and cannot SSH.

When I ping from 192.168.1.10 I get a response.

My ubuntu server 192.168.1.80 can ping google.

What am I missing?

Thank you

Edit: I have included the screenshot of ifconfig ens18 ifconfig

My desktop is on IP 192.168.3.113. My physical host is on IP 192.168.1.10 My windows server is on IP 192.168.1.20 This Ubuntu Server is on IP 192.168.1.80

My desktop can ping the physical server and windows server but not the ubuntu server.

My physical server can ping the windows server, my desktop, and the ubuntu server.

The ubuntu server can ping google, the physical server but not my desktop.

192

1 + 9

server

networking

Artur Meinild

1/12/24, 11:56 AM

Are you sure the static IP is not set? The config looks correct (maybe apart from the search domain), could it be a setting in you network equipment? What does `ifconfig ens18` report?

Mark Bingenheimer

1/12/24, 12:25 PM

The static ip is set. I can ping to it on the same subnet. I just can't see it from 192.168.3.x

Artur Meinild

1/12/24, 12:48 PM

Then I don't think this relates to Ubuntu, but to your network setup in general? Also, it should be the same subnet since /22 is the range 192.168.0.1-192.168.3.254.

Mark Bingenheimer

1/12/24, 12:51 PM

Sorry I was not on my computer before but now I am. See original post for edits with the information you asked for.

Artur Meinild

1/12/24, 12:53 PM

If you're using a router/firewall/DHCP server, then this should also be configured to use subnet /22.

Mark Bingenheimer

1/12/24, 12:57 PM

See above, I was able to get the screenshot as requested.

Jörg W Mittag

1/12/24, 11:57 PM

It looks like the Ubuntu configuration is perfectly fine. The problem is with your network setup, which has nothing to do with Ubuntu and is thus off-topic here.

Mark Bingenheimer

1/13/24, 1:17 AM

I just solved it a little bit ago and was coming to share. I had to add on-link: true below the route via line and it worked perfectly without any updates to my network.

Mark Bingenheimer

1/13/24, 1:18 AM

Credit to this post. https://askubuntu.com/questions/1246528/different-gateway-subnet-on-ubuntu-makes-network-unreachable

Score:0

Ubuntu

Mark Bingenheimer

1/13/24, 1:20 AM

The solution was to add

On-link: true

I used this link to solve my problem.

different gateway subnet on ubuntu makes network unreachable

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EN: How to set a static ip address with a /22 subnet?

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