| timss | I've been trying to configure a dual interfaced 18.04 server (Netplan 0.99), both with DHCP and a default GW. I'd like traffic that enters on a nic to leave on the same one. Adding `ip rule` and `ip route` to a new iproute2 table as shown here[1] works, but how would this translate to Netplan? | 14:41 |
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| timss | [1]: https://unix.stackexchange.com/a/23345 | 14:41 |
| slyon | timss: Right, you cannot define two default GW in netplan as there will be a conflict. So you need to define the static routes and routing policy manually, according to: https://netplan.io/reference/#routing | 14:45 |
| slyon | routes = "ip route" / routing-policy = "ip rule" | 14:46 |
| timss | That's helpful, thanks. If any routes are defined, are DHCP supplied DHCP default GW ignored for that given interface, or would you have to use dhcp4-overrides for that? | 14:51 |
| slyon | No. You'd need dhcp4-overrides.use-routes=false as well. | 14:52 |
| timss | Cheers, I'll have another go then | 14:52 |
| slyon | Have fun :) | 14:53 |
| timss | In the stackexchange answer there's a default gw added to the isp2 rt_table (ip route), how should the routes section look to do the same? I don't necessarily know what subnets the incoming packets are coming from as they are not on this LAN | 15:08 |
| slyon | I think you should be able to use 0.0.0.0/0 as the default subnet | 15:31 |
| mike40303 | hello - I have an instance in google cloud that needs a route on the 2nd nic. I have the yaml file in /etc/netplan modified so that it adds the routes when I run a netplan apply but the route is not there on boot. No errors when I run the netplan apply and the route is added, but I need the route on boot to mount vi fstab. Any suggestions on | 15:58 |
| mike40303 | how to troubleshoot? | 15:58 |
| slyon | mike40303: do you have DHCP enabled? maybe you need dhcp4-overrides.use-routes=false? | 16:05 |
| mike40303 | I will try that, but I did set the IP static as /32 but then I added the two routes that are present on the first nic: to: 10.150.0.1 via 0.0.0.0 and to 10.106.0.0/24 via 10.150.0.1. When I run the netplan apply I see "ens5: Configured" in the area I was having issues before I got the routes correct. | 16:10 |
| mike40303 | any time I use dhcp I get ens5: Could not set route: Network is unreachable. If I set the IP static the same routes do not show an error when netplan apply is ran. | 16:58 |
| slyon | mike40303: where do you get this error message, i.e. running which command? | 17:01 |
| slyon | also, the route is still there in your /etc/netplan/*.yaml file after reboot, correct? And if you run 'netplan apply' after reboot the route is working again? | 17:01 |
| mike40303 | when I run netplan apply I see the ens5: Confirgured or the Network in unreachable on the serial console. yes, the route is still in the yaml file but not in the routing table on a reboot. If I run netplan apply the route is then in netstat -nr. | 17:09 |
| slyon | what version of netplan and operating system are you using? | 17:10 |
| mike40303 | 1.10.1-5build1 on ubuntu 18.04 | 17:11 |
| slyon | 1.10.1-5build1 seems to be the "netplan" deb (unrelated to the netplan.io project), could you check for "netplan.io"? | 17:12 |
| mike40303 | sorry, 0.99-0ubuntu3~18.04.3 | 17:13 |
| slyon | ok. that should be alright | 17:14 |
| slyon | could you share your YAML config, e.g. via paste.ubuntu.com? | 17:16 |
| slyon | sorry... I need to run. | 17:23 |
| mike40303 | thank you, here it is https://paste.ubuntu.com/p/TKM6ZYJkCH/ | 17:29 |
| mike40303 | dhclient was running and wiping out the netplan config. we got it running by adding the /etc/dhcp/dhclient-exit-hooks.d/systemd-networkd script mentioned here in update #3 | 19:37 |
| mike40303 | https://serverfault.com/questions/1007936/stop-google-compute-instance-from-configuring-second-network-interfacehttps://serverfault.com/questions/1007936/stop-google-compute-instance-from-configuring-second-network-interface | 19:37 |
| === JanC_ is now known as JanC | ||
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