Public bug reported: The following example should configure a GRE tunnel between 172.16.4.2 and 172.16.1.2, with key 33490175. The effect should be like manually configured with: sudo ip tunnel add test1 mode gre local 172.16.4.2 remote 172.16.1.2 key 33490175.
However, the following Netplan configuration fails under Ubuntu 22.04 (latest development version, March 25, 2022): network: version: 2 renderer: networkd tunnels: gre1-255-255: mode: gre ttl: 255 local: 172.16.4.2 remote: 172.16.1.2 key: 33490175 addresses: - 172.20.82.94/30 Result of "sudo netplan generate": Error in network definition: gre1-255-255: 'input-key' is not required for this tunnel type Note: There should be no input and output keys. There is just one single key! Trying to change the configuration: keys: input: 33490175 # key: 33490175 Result of "sudo netplan generate": Error in network definition: gre1-255-255: 'input-key' is not required for this tunnel type Some investigation into the sources of Netplan (src/validation.c -> https://github.com/canonical/netplan/blob/main/src/validation.c): static gboolean validate_tunnel_backend_rules(NetplanNetDefinition* nd, yaml_node_t* node, GError** error) { /* Backend-specific validation rules for tunnels */ switch (nd->backend) { case NETPLAN_BACKEND_NETWORKD: switch (nd->tunnel.mode) { case NETPLAN_TUNNEL_MODE_VTI: case NETPLAN_TUNNEL_MODE_VTI6: case NETPLAN_TUNNEL_MODE_WIREGUARD: break; /* TODO: Remove this exception and fix ISATAP handling with the * networkd backend. * systemd-networkd has grown ISATAP support in 918049a. */ case NETPLAN_TUNNEL_MODE_ISATAP: return yaml_error(node, error, "%s: %s tunnel mode is not supported by networkd", nd->id, g_ascii_strup(tunnel_mode_to_string(nd->tunnel.mode), -1)); break; default: if (nd->tunnel.input_key) return yaml_error(node, error, "%s: 'input-key' is not required for this tunnel type", nd->id); if (nd->tunnel.output_key) return yaml_error(node, error, "%s: 'output-key' is not required for this tunnel type", nd->id); break; } break; It seems that the cases NETPLAN_TUNNEL_MODE_GRE and NETPLAN_TUNNEL_MODE_IP6GRE are missing for systemd-networkd. According to https://github.com/systemd/systemd/issues/12144, systemd-networkd should support configuration with keys since ca. 2 years. ** Affects: netplan Importance: Undecided Status: New ** Affects: systemd Importance: Unknown Status: Unknown ** Affects: ubuntu Importance: Undecided Status: New ** Bug watch added: github.com/systemd/systemd/issues #12144 https://github.com/systemd/systemd/issues/12144 ** Also affects: systemd via https://github.com/systemd/systemd/issues/12144 Importance: Unknown Status: Unknown ** Also affects: ubuntu Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1966476 Title: Netplan does not provide "key" parameter to GRE tunnel configuration via systemd-networkd To manage notifications about this bug go to: https://bugs.launchpad.net/netplan/+bug/1966476/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs