[Bug 258319] Network (em0) does'nt work not only in 13.0-RELEASE but also in it's installer.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=258319

            Bug ID: 258319
           Summary: Network (em0) does'nt work not only in 13.0-RELEASE
                    but also in it's installer.
           Product: Base System
           Version: 13.0-RELEASE
          Hardware: i386
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: nctto14935@yahoo.co.jp

In 11.4-RELESE/i386 or before, network (em0, IPv4) works well (in base system
as well as in it's installer).  But in 13.0-RELEASE/i386, network does'nt work
not only in the base system but also in it's installer. I have confirmed this
by three different methods as follows:

(1) Updating 11.4-RELEASE/i386 to 13.0-RELEASE/i386
freebsd-update works perfectly and it successfully upgrades 11.4 (of which
network works well) into 13.0, but network suddenly stops just after rebooting
the system with 13.0 kernel.
(2) Network installation of 13.0-RELEASE/i386
The bootonly installer of 13.0-RELEASE works halfway.  It fails to fetch
13.0-RELEASE files from the internet (since network does'nt work) and finally
ends with error messages.  This is a problem of 13.0 installer, but I feel this
problem stems from the same origin. 
(3) DVD Installaton of 13.0-RELEASE/i386
The dvd1 installer of 13.0-RELEASE successfully installs 13.0-RELEASE, but
after rebooting the installed system, one finds network does'nt work.

In addition I have tried 12.2-RELEASE/i386 bootonly installer, and found that
12.2 installer shares the same problem. (In contrast, 11.4 installer or before
works perfectly.)

In 13.0-RELEASE/i386, network phenomena as follows are occuring:

(1) "ping hostname" ends with "Unknown host".
(2) "ping IP-address-of-host" works well.
(3) "ping localhost" works well.
(4) "ping IP-address-of-DNS-server" ends with "Host is down".
(5) "ping IP-address-of-gateway" ends with "Host is down"
(6) "ssh IP-address-of-host" from another computer fails.

I have confirmed these phenomena just after the clean installation of
13.0-RELEASE/i386.  According to dmesg messages, 13.0 kernel seems to recognize
em0.  As for 13.0-RELEASE/amd64, I have never encountered the network problem
like this.

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