Aug 29 14:14:39 node2 configure-ovs.sh[6535]:     inet 192.168.128.182/24 brd 192.168.128.255 scope global dynamic noprefixroute enp1s0  Aug 29 14:14:39 node2 configure-ovs.sh[6535]:        valid_lft 7175sec preferred_lft 7175sec  Aug 29 14:14:39 node2 configure-ovs.sh[6535]:     inet6 2a02:a03f:a01d:1a02:b241:6fff:fe0f:3d56/64 scope global dynamic noprefixroute  Aug 29 14:14:39 node2 configure-ovs.sh[6535]:        valid_lft 86377sec preferred_lft 14377sec  Aug 29 14:14:39 node2 configure-ovs.sh[6535]:     inet6 fe80::b241:6fff:fe0f:3d56/64 scope link noprefixroute  Aug 29 14:14:39 node2 configure-ovs.sh[6535]:        valid_lft forever preferred_lft forever  Aug 29 14:14:39 node2 configure-ovs.sh[3342]: ++ ip route show  Aug 29 14:14:39 node2 configure-ovs.sh[6536]: default via 192.168.128.1 dev enp1s0 proto dhcp src 192.168.128.182 metric 100  Aug 29 14:14:39 node2 configure-ovs.sh[6536]: 192.168.128.0/24 dev enp1s0 proto kernel scope link src 192.168.128.182 metric 100  Aug 29 14:14:39 node2 configure-ovs.sh[3342]: ++ ip -6 route show  Aug 29 14:14:39 node2 configure-ovs.sh[6537]: ::1 dev lo proto kernel metric 256 pref medium  Aug 29 14:14:39 node2 configure-ovs.sh[6537]: 2a02:a03f:a01d:1a02::/64 dev enp1s0 proto ra metric 100 pref medium  Aug 29 14:14:39 node2 configure-ovs.sh[6537]: fe80::/64 dev enp1s0 proto kernel metric 1024 pref medium  Aug 29 14:14:39 node2 configure-ovs.sh[6537]: default via fe80::2e0:67ff:fe1f:9b0d dev enp1s0 proto ra metric 100 pref medium  Aug 29 14:14:39 node2 configure-ovs.sh[3342]: ++ exit 4  Aug 29 14:14:39 node2 configure-ovs.sh[3338]: + e=4  Aug 29 14:14:39 node2 configure-ovs.sh[3338]: + trap handle_termination INT TERM  Aug 29 14:14:39 node2 configure-ovs.sh[3338]: + '[' 4 -eq 0 ']'  Aug 29 14:14:39 node2 configure-ovs.sh[3338]: + '[' -z 15m ']'  Aug 29 14:14:39 node2 configure-ovs.sh[3338]: + echo 'configure-ovs failed, will retry after 15m'  Aug 29 14:14:39 node2 configure-ovs.sh[3338]: configure-ovs failed, will retry after 15m  Aug 29 14:14:39 node2 configure-ovs.sh[3338]: + touch /tmp/configure-ovs-retry  Aug 29 14:14:39 node2 configure-ovs.sh[3338]: + sleep 15m

Initial State Captured: The first part of the log shows the script's print_state function correctly reading the network configuration of the enp1s0 interface before making any changes.

It sees the global IPv6 address: inet6 2a02:a03f:a01d:1a02:...
It sees the IPv4 route: default via 192.168.128.1 dev enp1s0
Most importantly, it sees the problematic IPv6 default route: default via fe80::2e0:67ff:fe1f:9b0d dev enp1s0

The Failure Trigger: The script proceeds with its reconfiguration logic based on this initial state. It creates the br-ex bridge, moves the IP addresses from enp1s0 to the bridge, and enslaves enp1s0. This action immediately breaks the IPv6 default route.

The script eventually calls the activate_nm_connections function. Inside that function, it executes nmcli conn up for the new OVS connections (like ovs-if-br-ex), failing with code 4.

# ... (inside the convert_to_bridge function)

             ipv6.method "${ipv6_method}" ipv6.route-metric "${bridge_metric}" \
             ${extra_if_brex_args}
        fi
      fi

      # --- START: Added code to fix IPv6 link-local default route ---

      # Check for a link-local default route on the original interface
      old_ipv6_route=$(ip -6 route show default dev "${iface}" | grep 'via fe80::')
      if [[ -n "${old_ipv6_route}" ]]; then
        echo "Detected link-local IPv6 default route. Recreating it on ${bridge_name}."

        # Extract gateway and metric from the old route
        gateway=$(echo "${old_ipv6_route}" | awk '{print $3}')
        metric=$(echo "${old_ipv6_route}" | awk '/metric/ {print $(NF-1)}') # Gets the value before 'pref'

        # Deactivate the old connection to release the interface and route
        echo "Deactivating old connection ${old_conn} on device ${iface}."
        nmcli connection down "${old_conn}" || echo "Old connection was already down. Proceeding."

        # Add the corrected default route pointing to the new bridge interface
        echo "Adding new default route: via ${gateway} dev ${bridge_name} metric ${metric}"
        ip -6 route add default via "${gateway}" dev "${bridge_name}" metric "${metric}"
      fi

      # --- END: Added code ---

      configure_driver_options "${iface}"
    }