You are right, ping is not happy about 192.168.1.0. So I switched to 192.168.1.1 and 192.168.1.2. Ping works in both directions. But ospfd still list an empty table for "show ip ospf neighbor". All commands again for nodes 1 and 2: $ sudo netns add ns-1 $ sudo netns add ns-2 $ sudo ip netns exec ns-1 ip a a 192.168.1.1/24 dev uplink $ sudo ip netns exec ns-2 ip a a 192.168.1.2/24 dev uplink $ sudo ip netns exec ns-1 ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 4: uplink@if3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000 link/ether 12:bc:58:4f:6c:c5 brd ff:ff:ff:ff:ff:ff link-netns switch inet 192.168.1.1/24 scope global uplink valid_lft forever preferred_lft forever inet6 fe80::10bc:58ff:fe4f:6cc5/64 scope link valid_lft forever preferred_lft forever $ sudo ip netns exec ns-2 ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 7: uplink@if6: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000 link/ether 9e:84:c2:86:90:d8 brd ff:ff:ff:ff:ff:ff link-netns switch inet 192.168.1.2/24 scope global uplink valid_lft forever preferred_lft forever inet6 fe80::9c84:c2ff:fe86:90d8/64 scope link valid_lft forever preferred_lft forever $ sudo ip netns exec ns-2 ip r 192.168.1.0/24 dev uplink proto kernel scope link src 192.168.1.2 $ sudo ip netns exec ns-1 ip r 192.168.1.0/24 dev uplink proto kernel scope link src 192.168.1.1 $ sudo ip netns exec ns-2 ping 192.168.1.1 PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data. 64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=0.110 ms ^C --- 192.168.1.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.110/0.110/0.110/0.000 ms $ sudo ip netns exec ns-1 ping 192.168.1.2 PING 192.168.1.2 (192.168.1.2) 56(84) bytes of data. 64 bytes from 192.168.1.2: icmp_seq=1 ttl=64 time=0.054 ms 64 bytes from 192.168.1.2: icmp_seq=2 ttl=64 time=0.063 ms ^C --- 192.168.1.2 ping statistics --- 2 packets transmitted, 2 received, 0% packet loss, time 1022ms rtt min/avg/max/mdev = 0.054/0.058/0.063/0.004 ms $ cat ospf1.conf router ospf ospf router-id 192.168.1.1 network 192.168.1.0/24 area 1 $ cat ospf2.conf router ospf ospf router-id 192.168.1.2 network 192.168.1.0/24 area 1 $ sudo ip netns exec ns-1 ospfd --terminal -f ./ospf1.conf -i /run/frr/ospfd1.pid $ sudo ip netns exec ns-2 ospfd --terminal -f ./ospf2.conf -i /run/frr/ospfd2.pid On 8/21/20 10:33 PM, Don Slice wrote:
Can you ping between the pertinent interfaces? In other words, did you verify reachability between 192.168.1.1 and 192.168.1.0? BTW, I would avoid using the .0 address on a /24. Historically, this has represented the subnet and not one of the addresses on the subnet. There are circumstances it makes sense (/31 addressing for example) but is normally not done, at least as far as I know.
On Fri, Aug 21, 2020 at 3:08 PM Moritz Warning <moritzwarning@web.de> wrote:
Hi,
I am a newbie with frr/ospf. My aim is to run two ospfd instances in a Linux network namesspace each and let them talk to each other via a virtual link (interface called uplink).
My test setup is attached. But I do not see any traffic. This is probably some basic configuration error. I did have a look at the documentation, but it did not seem to cover such simple setups. A few pointer in the right direction would be helpful.
thanks, mwarning
$ ip netns add ns-0 $ ip netns add ns-1
# Node 0:
$ sudo ip netns exec ns-0 ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 4: uplink@if3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000 link/ether ce:e6:b3:5d:d3:70 brd ff:ff:ff:ff:ff:ff link-netns switch inet 192.168.1.0/24 scope global uplink valid_lft forever preferred_lft forever inet6 fe80::cce6:b3ff:fe5d:d370/64 scope link valid_lft forever preferred_lft forever
$ cat ospf0.conf router ospf ospf router-id 192.168.1.0 network 192.168.1.0/24 area 1
$ sudo ip netns exec ns-0 ospfd --terminal -f ./ospf0.conf -i /run/frr/ospfd0.pid
# Node 1:
$ sudo ip netns exec ns-1 ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 7: uplink@if6: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000 link/ether 12:45:ca:46:19:52 brd ff:ff:ff:ff:ff:ff link-netns switch inet 192.168.1.1/24 scope global uplink valid_lft forever preferred_lft forever inet6 fe80::1045:caff:fe46:1952/64 scope link valid_lft forever preferred_lft forever
$ cat ospf1.conf router ospf ospf router-id 192.168.1.1 network 192.168.1.0/24 area
$ sudo ip netns exec ns-1 ospfd --terminal -f ./ospf1.conf -i /run/frr/ospfd1.pid
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