I have a WireGuard VPN set up that uses the 10.20.30.0/24 IP range. I want to configure routing on my laptop so that traffic to 10.20.30.xy is routed through 192.168.99.xy whenever the latter is reachable on the local network. If the local address isn’t reachable, I want the traffic to be routed through the WireGuard tunnel as usual. I understand that I can get about 80% of the way there by using a script triggered by NetworkManager whenever I connect to the local network. The script would simply add the necessary routes using: Is there a simple way to handle this automatically, accounting for local network reachability? I’m also wondering if there might be a solution using OSPF or another dynamic routing protocol that could automatically detect reachability and adjust the routing accordingly. EDIT: I am not opposed to making a /32 route for each of my devices (there aren't that many of them). I can also adjust my network topology - making a new prefix for switched devices would definitely be an option for me.

I am trying to set up bird for routing networks between my sites witch are connected with 2 L2 links. Right now all my OSPF_INTRA are redistributed to others routers with automatic cost calculation. I would like to specify extra cost for some network in order to "force" traffic to pass on the other link. (eg. Real-Time traffic on the first link and Bandwitdh consuming traffic on the other by tweaking cost). Regards, Nicolas

I have a network that is connected to the internet through Router 1 through cable, and separately through Router 2 on LTE. It is desired that in a situation where both cable and LTE are available, Router 1 and Router 2 both route their respective traffic through Router 1's cable connection. Only cable (or Router 1) fails, Router 2's LTE link is used. Once Router 1's link becomes available again, both go back to cable. I am trying to set up a routing daemon (Quagga) on both Router 1 and Router 2, so the two devices exchange available routes through the OSPF protocol. However, one of the fundamental assumptions of this concept seems to be that the router's kernel notifies Quagga when its link is dead; as such, Quagga will treat a removed LAN cable or a completely non-responsive router as a "dead" route, but not other modes of failure, such as the LTE modem losing association with the cellular network or the cable being removed from the cable modem (both of which do not cause any changes on the "local" side of the modem). Thus, my question: How can I instruct Quagga, or any other routing daemon, to periodically verify a route (e.g. by pinging a host that should be reachable through that route) and treat the route as failed if those pings fail. Thank you for any suggestions.

I have an anycast setup for DNS using BIRD https://unix.stackexchange.com/questions/381962/ospf-migrating-quagga-to-bird However, using "show routes" in the birdc command I see lots of OSPF learned routes from our internal network. As it is, in this anycast setup (and normally), there is only a need to announce routes, and not to receive them. How to create a filter in BIRD to ignore the OSPF routes? My OSPF setup is this one: protocol ospf { tick 2; rfc1583compat yes; area 0.0.0.0 { networks { 1.1.1.0/22; }; stubnet 2.2.2.2/32 { cost 100; }; stubnet 3.3.3.3/32 { cost 500; }; stubnet 4.4.4.4/32 { cost 1000; }; stubnet 5.5.5.5/32 { cost 900; }; interface "eth0" { cost 1000; password "MySecretPassword" { id 5; }; authentication cryptographic; }; interface "dummy0" { stub; }; interface "dummy1" { stub; }; interface "dummy2" { stub; }; interface "dummy3" { stub; }; }; }

I need/want to migrate from Quagga to BIRD after several Quagga hiccups, namely https://unix.stackexchange.com/questions/331664/quagga-stopped-working-after-updates-in-stretch/331665 . BIRD is also more flexible and modern. I have my OSPF BIND anycast configuration in Quagga and would like to setup the OSPF service in a way similar on BIRD. What to do? My /etc/quagga/ospfd.conf is: ! ! Zebra configuration saved from vty ! 2011/03/22 21:17:11 ! hostname dns password 8 xxxxxxx enable password 8 xxxxxxx log stdout service password-encryption ! ! ! interface dummy0 ip ospf cost 100 ! interface dummy1 ip ospf cost 500 ! interface dummy2 ip ospf cost 1000 ! interface dummy3 ip ospf cost 900 ! interface eth0 ip ospf authentication message-digest ip ospf message-digest-key 5 md5 MySecretPassword ip ospf cost 1000 ! interface eth1 ip ospf cost 1000 ! interface lo ! router ospf ospf router-id 1.1.1.1 auto-cost reference-bandwidth 10000 network 1.1.1.0/22 area 0.0.0.0 network 2.2.2.2/32 area 0.0.0.0 network 3.3.3.3/32 area 0.0.0.0 network 4.4.4.4/32 area 0.0.0.0 network 5.5.5.5/32 area 0.0.0.0 area 0 filter-list prefix AREA_1_OUT out ! ip prefix-list AREA_1_OUT seq 5 permit 2.2.2.2/32 ip prefix-list AREA_1_OUT seq 10 permit 3.3.3.3/32 ip prefix-list AREA_1_OUT seq 15 permit 4.4.4.4/32 ip prefix-list AREA_1_OUT seq 20 permit 5.5.5.5/32 ip prefix-list AREA_1_OUT seq 25 deny any ! line vty !

I am migrating an anycast OSPF routing BIND redundant setup from Quagga to BIRD. One of my difficulties is getting several routes with different costs with BIRD, in the same way as I am doing it in quagga. As in Quagga I am doing in /etc/quagga/ospfd.conf: interface dummy0 ip ospf cost 100 ! interface dummy1 ip ospf cost 500 ! interface dummy2 ip ospf cost 1000 ! interface dummy3 ip ospf cost 900 ! I can see in birdc using the command show ospf state that my configuration is not giving weights, despite having defined the cost in the interfaces in /etc/bird.conf. What to do? protocol ospf { tick 2; rfc1583compat yes; area 0.0.0.0 { networks { 1.1.1.0/22; 2.2.2.2/32; 3.3.3.3/32; 4.4.4.4/32; 5.5.5.5/32; }; interface "eth0" { cost 1000; password "xxxxxxxxxx" { id 5; }; authentication cryptographic; }; interface "dummy0" { stub; cost 100; }; interface "dummy1" { stub; cost 500; }; interface "dummy2" { stub; cost 1000; }; interface "dummy3" { stub; cost 900; }; }; }