I will give a simple example of setting up OSPF in Quagga, for the test I will use Hyper-V with a virtual switch and virtual machines running Ubuntu Server 18.04.
If the server is used as a router or for NAT, then we will allow traffic to go between network interfaces, enable proxy_arp if necessary and disable rp_filter:
nano /etc/sysctl.conf net.ipv4.conf.all.forwarding=1 net.ipv4.conf.all.proxy_arp=1 net.ipv4.conf.default.rp_filter=0 net.ipv4.conf.all.rp_filter=0 sysctl -p
I created two network interfaces on both test servers, the first external one receives an IP address via DHCP with the Internet, the second one is internal and connected to a virtual local switch. Let’s manually assign an IP address to the local network interface:
ip a cd /etc/netplan/ ls nano 50-cloud-init.yaml
network: ethernets: eth0: dhcp4: true eth1: addresses: - 192.168.55.1/24 version: 2
Let’s see the current routes:
We install Quagga on all machines, I left the installation instructions at the end of the article.
Example configuration /etc/quagga/zebra.conf on the first machine:
hostname TEST1 password ixnfo.com enable password ixnfo.com log file /var/log/quagga/zebra.log ! line vty !
Example /etc/quagga/ospfd.conf on the first machine:
log file /var/log/quagga/ospfd.log router ospf !router identifier, must be unique for each router (obtained via DHCP on the external interface) ospf router-id 192.168.24.73 log-adjacency-changes !Advertise routes lifted automatically redistribute kernel !Advertise routes to connected networks redistribute connected !Advertise static routes redistribute static !Network and zone number with neighboring routers network 192.168.24.0/24 area 1 ! !the network to be announced, for example 192.168.55.0/24 access-list 20 permit 192.168.55.0 0.0.0.255 access-list 20 deny any ! line vty !
network: ethernets: eth0: dhcp4: true eth1: addresses: - 192.168.55.2/24 version: 2
Example /etc/quagga/zebra.conf on a second machine:
hostname TEST2 password ixnfo.com enable password ixnfo.com log file /var/log/quagga/zebra.log ! line vty !
Example /etc/quagga/ospfd.conf on a second machine:
log file /var/log/quagga/ospfd.log router ospf ospf router-id 192.168.24.78 log-adjacency-changes redistribute kernel redistribute connected redistribute static network 192.168.24.0/24 area 1 ! access-list 20 permit 192.168.55.0 0.0.0.255 access-list 20 deny any ! line vty !
Specify the correct owner and group for the generated configuration files, and also run zebra and ospfd:
sudo chown quagga:quagga /etc/quagga/*.conf mkdir /var/log/quagga/ chown quagga:quagga /var/log/quagga/ sudo service zebra status sudo service zebra restart sudo service ospfd status sudo service ospfd restart
tcpdump -nvi any proto ospf
I got it displayed:
tcpdump: listening on any, link-type LINUX_SLL (Linux cooked), capture size 262144 bytes 07:31:26.898583 IP (tos 0xc0, ttl 1, id 4243, offset 0, flags [none], proto OSPF (89), length 68) 192.168.24.78 > 126.96.36.199: OSPFv2, Hello, length 48 Router-ID 192.168.24.78, Area 0.0.0.1, Authentication Type: none (0) Options [External] Hello Timer 10s, Dead Timer 40s, Mask 255.255.255.0, Priority 1 Designated Router 192.168.24.73, Backup Designated Router 192.168.24.78 Neighbor List: 192.168.24.73
For the test on the second server, let’s add a route and make sure that the route is automatically added on the first server:
ip route add 192.168.5.3 dev eth1 ip route route -n
I will give examples of viewing a list of routes, neighbors and other information:
telnet localhost 2601 show ip route show ip route connected show ip route static show ip route kernel show ip route ospf show ip route summary exit vtysh show ip ospf show ip ospf neighbor show ip ospf neighbor detail show ip ospf interface show ip ospf border-routers show ip ospf database show ip access-list show ip route show ip route ospf exit