Debian Server Routing OSPF on two links and one loopback address

From	Timothy M Butterworth <timothy.m.butterworth@gmail.com>
Newsgroups	linux.debian.user
Subject	Debian Server Routing OSPF on two links and one loopback address
Date	2024-12-01 00:50 +0100
Message-ID	<JOFnP-cRMU-5@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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All,

I have been working out how to have my server setup with OSPF routing. I
have two network interfaces each configured with a /30 and one dummy
loopback configured with a /32. The goal is to have the /32 address
advertised in DNS so traffic can use per-session load balancing across both
/30's.

Can anyone think of anything I might have missed?

### Create and configure the dummy interface

sudo touch /etc/network/interfaces.d/ospf.cfg
sudo vim /etc/network/interfaces.d/ospf.cfg

auto ospf
iface ospf inet static
  address 10.0.0.1/32
  pre-up ip link add ospf type dummy


### Configure Static IP addresses
auto eth0
iface eth0 inet static
  address 10.1.1.2/30

auto eth1
iface eth1 inet static
  address 10.1.1.6/30


### Add Default Gateway routes
route add -net default gw 10.1.1.1 metric 1024 dev eth0
route add -net default gw 10.1.1.5 metric 1024 dev eth1

# NOTE: I am not sure if the above commands will be persistent.

### Install and Configure frr Free Range Routing
sudo apt install frr

sudo vim /etc/frr/daemons
change no to yes for OSPF

sudo /usr/bin/vtysh

conf t
router ospf
network 10.0.0.1/32 area 0
network 10.1.1.0/30 area 0
network 10.1.1.4/30 area 0

# NOTE: frr configuration is stored in. sudo vim /etc/frr/frr.conf


### Enable IP Forwarding
sudo sysctl -w net.ipv4.ip_forward=1

### sysctl.d config file
sudo touch /etc/sysctl.d/ipforward
sudo vim /etc/sysctl.d/ipforward
net.ipv4.ip_forward = 1

### Firewalld Configuration - Open OSPF
sudo firewall-cmd --add-protocol=ospf --permanent --zone=internal
sudo firewall-cmd --add-protocol=89 --permanent --zone=internal

### DNS Configuration
;
; BIND data file for local loopback interface
;
$TTL 604800
@ IN SOA ns1.home.arpa. root.home.arpa. (
     2 ; Serial
604800 ; Refresh
 86400 ; Retry
2419200 ; Expire
604800 ) ; Negative Cache TTL
;
@ IN NS ns1.home.arpa.
@ IN A 127.0.0.1
@ IN AAAA ::1

ns1        IN      A    127.0.0.1
ns1        IN      AAAA ::1
server-1   IN      A    10.0.0.1


-- 
⢀⣴⠾⠻⢶⣦⠀
⣾⠁⢠⠒⠀⣿⡁ Debian - The universal operating system
⢿⡄⠘⠷⠚⠋⠀ https://www.debian.org/
⠈⠳⣄⠀⠀

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Debian Server Routing OSPF on two links and one loopback address Timothy M Butterworth <timothy.m.butterworth@gmail.com> - 2024-12-01 00:50 +0100
  Re: Debian Server Routing OSPF on two links and one loopback address Timothy M Butterworth <timothy.m.butterworth@gmail.com> - 2024-12-01 01:00 +0100
    Re: Debian Server Routing OSPF on two links and one loopback address Andy Smith <andy@strugglers.net> - 2024-12-01 01:20 +0100
      Re: Debian Server Routing OSPF on two links and one loopback address Timothy M Butterworth <timothy.m.butterworth@gmail.com> - 2024-12-01 09:30 +0100
  Re: Debian Server Routing OSPF on two links and one loopback address Andy Smith <andy@strugglers.net> - 2024-12-01 01:10 +0100
    Re: Debian Server Routing OSPF on two links and one loopback address Timothy M Butterworth <timothy.m.butterworth@gmail.com> - 2024-12-01 09:30 +0100
  Re: Debian Server Routing OSPF on two links and one loopback address Timothy M Butterworth <timothy.m.butterworth@gmail.com> - 2024-12-01 01:40 +0100
    Re: Debian Server Routing OSPF on two links and one loopback address Timothy M Butterworth <timothy.m.butterworth@gmail.com> - 2024-12-01 02:10 +0100
      Re: Debian Server Routing OSPF on two links and one loopback address Timothy M Butterworth <timothy.m.butterworth@gmail.com> - 2024-12-01 03:10 +0100

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