[Bug 229727] On install, Broadcom chipset doesn't receive DHCPOFFER

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229727

            Bug ID: 229727
           Summary: On install, Broadcom chipset doesn't receive DHCPOFFER
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: sten at artdecode.de

Dear community,

I was in the process of installing FreeBSD on my old (Mid-2010) MacBook Pro
(dual core, 4 GiB memory).

While installing a snapshot of 12.0 (same effect with 11.2-RELEASE), I'm asked
whether I want to configure IPv4 for the wired interface. This interface is
connected to a Gigabit switch, which is connected with a 100MBit cable (don't
ask) to another switch, which has the DHCP server. I answer yes, am asked
whether I want to use DHCP, I say yes again, and the install then hangs. The
console will show

dhclient[...]: send_packet: Network is down.

This message will repeat, apparently indefinitely.

The DHCP server shows me this in its logs:

dhcpd: DHCPDISCOVER from c8:bc:c8:xx:xx:xx via eth0
dhcpd: DHCPDOFFER on ... to c8:bc:c8:xx:xx:xx via eth0

The interface, as identified by the FreeBSD installer, is: Broadcom NetXtreme
Fast Ethernet Controller, ASIC Revision 0x5784100.

The light on the workgroup switch shows a 1GBit link, but will turn off and on
again occasionally. (Some form of reset seems to be going on.)

The DHCP server works fine for other machines hanging off the same workgroup
switch.

It seems as if the DHCPOFFER isn't seen by the NIC, but I have no clue why this
should be so.

Any ideas?

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