[Bug 276198] bsdconfig - can't setup network interface using "default" option

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276198

            Bug ID: 276198
           Summary: bsdconfig - can't setup network interface using
                    "default" option
           Product: Base System
           Version: 13.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: peter.chen.devs@gmail.com

Environment:
  FreeBSD version: 13.2-RELEASE
  hardware: Raspberry Pi 400
  ethernet cable: cat 5e

Bug Description:
  In bsdconfig(8), the "default" option in networking management can't setup
the network interface correctly if the previous state of the network link is
"no carrier" caused by unsupported option. Even using "#service netif restart"
won't help.

Steps to Reproduce Bug:
  1. In bsdconfig(8) > Networking Management > Network Interfaces > <link_name>
> options 
  2. Select "media 1000baseT mediaopt full-duplex,master instance 1" and bring
up interface during confirmation. This option is not supported by Raspberry Pi
400, so when you exit the bsdconfig(8) and type ifconfig(8), the status of
<link_name> shows "no carrier".
  3. Repeat step 1 but choose "default" option and bring up interface during
confirmation.
  4. ifconfig(8) shows the status of <link_name> to be "no carrier". The
setting in "/etc/rc.conf" file for <link_name> is correct. Run "#service netif
restart" won't work.
  5. Repeat step 1 but choose "media 100baseTX" option and bring up interface
during confirmation.
  6. Exit the bsdconfig(8) and use ifconfig(8) to show network interface info,
the status of <link_name> becomes "active". However, when you try to ping other
IP addresses (such as 192.168.0.1), it shows "no route to host". This bug is
described in bug#276197.
  7. Use service(8) with command "#service netif restart" to restart netif, the
ifconfig(8) shows the link as "active", now you are able to ping other ip
addresses and connect to other hosts.
  8. Now, open bsdconfig(8) again and choose "default" option. After that,
ifconfig(8) shows the status is "active" and you can successfully ping /
connect to other hosts.

Expected Result:
  Changing option "media 1000baseT mediaopt full-duplex,master instance 1" ->
"default" should work, at least the network interface should work after running
"#service netif restart". However, it is only working by changing it following
"media 1000baseT mediaopt full-duplex,master instance 1" -> "media 100baseTX"
-> "default".
  The issue of not setting up "media 100baseTX" after exiting bsdconfig(8) is
described by bug#276197.

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