gbridge cannot connect on native-POSIX target

The connection does not seem to be an issue as I can ping the target, but gbridge gets stuck trying to connect.

Steps to reproduce

1. Run net-setup.sh from https://github.com/zephyrproject-rtos/net-tools
2. Build and run the native_posix target

west build -b native_posix -d build/greybus/net modules/lib/greybus/samples/subsys/greybus/net -- -DOVERLAY_CONFIG=overlay-qemu_802154.conf

3. Load the greybus module gb-netlink
4. Start gbridge

Output

netlink: Initializing the controller
TCP/IP: Initializing the controller
TCP/IP: Creating the event loop thread
...
Trying to connect to module at 2001:db8::1:4242