Unable to set network MTU

[tredeske]

Describe the bug

When driver_opts is used to set the MTU of a network, the setting has no effect.

networks:
  inner:
    ipam:
      driver: default
      config:
        - subnet: 172.28.0.0/24
      driver_opts:
        mtu: 9000

podman-compose -v

podman-compose version: 1.0.6
['podman', '--version', '']
using podman version: 4.4.1
podman-compose version 1.0.6
podman --version 
podman version 4.4.1

Environment:

• OS: RHEL 8
• rootless

[tricepsbrachii]

Using com.docker.network.driver.mtu works for me. For example:

networks:
  default:
    name: test_network
    driver: bridge
    driver_opts:
      com.docker.network.driver.mtu: 1392

I guess this can be closed?