After installing new router with ubuntu 18.04 on it i'm got a problem with working ospf via gre tunnel to my older routers. All configured simular, but from new router i got ospf state Init/DROther. Older routers (without netplan) dont see any neighbor. Tunnels work fine with static routing.
I found solution and fix problem manually. I found that netplan make tunnel with 'ttl inherit' (on other routers ttl 255).
tunnel1: gre/ip remote 22.214.171.124 local 126.96.36.199 ttl inherit
ip tunnel change tunnel1 ttl 255 command execution ospf starts to work.
How can I add to netplan ttl and pointopoint parameters to tunnel intarface? How to set commands like below to netplan file?
ifconfig tunnel1 pointopoint 10.2.2.1 ip tunnel change tunnel1 ttl 255