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lepe
Asked: 2022-06-17 19:13:58 +0800 CST

Translating RedHat network settings to Netplan (Ubuntu 22.04)

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Update:

It seems it was an issue with the load balancer settings. It is now working with the configuration I show below.

Question:

I need to translate these instructions for RedHat into netplan settings (my current translation seems broken):

Overview:

This server is sitting behind a load balancer. The instructions to setup the communication with the load balancer (for RedHat) are:

  1. Edit /etc/sysconfig/network-scripts/ifcfg-eth1
DEVICE=eth1
IPADDR=172.16.1.2
NETMASK=255.255.0.0
NETWORK=172.16.0.0
BROADCAST=172.16.255.255
ONBOOT=yes
  1. Edit /etc/sysconfig/network-scripts/route-eth1
172.16.0.0/16 dev eth1 scope link proto kernel table 128
default via 172.16.1.1 dev eth1 table 128
  1. Edit /etc/sysconfig/network-scripts/rule-eth1
172.16.1.2 from table 128

NOTE: Load Balancer's IP is: 172.16.1.1

My translation is (netplan : Ubuntu 22.04):

network:
  ethernets:
    eth1:
      addresses:
      - 172.16.1.2/16
      routes:
        - to: 0.0.0.0/0
          via: 172.16.1.1
          table: 128
      routing-policy:
        - from: 172.16.0.0/16
          table: 128

ip route shows:

172.16.0.0/16 dev eth1 proto kernel scope link src 172.16.1.2

And ip a shows:

4: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether fa:16:3e:3f:40:83 brd ff:ff:ff:ff:ff:ff
    inet 172.16.1.2/16 brd 172.16.255.255 scope global eth1
       valid_lft forever preferred_lft forever
    inet6 fe80::f816:3eff:fe3f:4083/64 scope link 
       valid_lft forever preferred_lft forever

NOTE: I have other 2 more interfaces set in this server, a public IP address and a private local address:

    eth0:
      addresses:
      - xxx.xxx.10.100/24
      routes:
        - to: 0.0.0.0/0
          via: xxx.xxx.10.1
      nameservers:
        addresses:
        - xxx.xxx.xxx.219
        - xxx.xxx.xxx.31
    eth2:
      addresses:
      - 10.0.0.10/24

Questions:

  1. Is there something wrong with my translation?
  2. Why ip route doesn't shows the table (Is that normal)?
  3. If I specify metric under routes makes a difference in this scenario?
  4. Is routes.to (0.0.0.0/0) correct, or should I use 172.16.0.0/16?

Tests:

  • Ping works to load balancer
  • Ports 80/443 can be accessed to this server directly

Problem:

  • Ports 80/443 shows "filtered" when testing the Load Balancer's IP address
networking

0 Answers