Bridge, dpcpd, sshd

Nerius Landys nlandys at
Thu Mar 24 00:56:25 UTC 2011

> I have a server machine that I use as DHCP server, sshd login etc, and since I have multiple Ethernet interfaces on it, I would like to use two of those for the internal network to avoid adding one more ethernet switch for just one extra machine. DHCP should configure hosts on both those interfaces and all the hosts should be on the same subnet.
> So, I set up a bridge interface as per the FreeBSD handbook (ch. 31.5), but now dhcpd is refusing to start during boot as it claim that the "bridge0" interface doesn't exist. If I manually start dhcpd with the same parameters after the machine has come up, it will start and it will also work as expected and assign addresses to users connecting from teh bridge interface.
> sshd seems to do something similar, it refuses to start, but can manually be re-started later on.
> Is this some kinf of expected behavior, or does it sound like I'm doing something badly wrong? Can I force bride0 to be configured earlier in the boot so it is always there when the daemons start waking up?
> Configuration info below.
> TIA,
>  Chris
> ===== rc.conf extract ====
> dhcpd_enable="YES"
> dhcpd_ifaces="bridge0"
> cloned_interfaces="bridge0"
> ifconfig_bridge0="addm dc0 addm dc1 up"
> ifconfig_bridge0="inet"
> ifconfig_dc0="up"
> ifconfig_dc1="up"
> ===== sshd.conf extract =====
> ListenAddress
> === the dhcpd.conf is quite standard and does not say anything about the interfaces, that info is in rc.conf above ====
> === /var/log/messages extract ====
>  dhcpd: bridge0: not found

I am running a very similar setup.  I learned from my own experience
that sometimes little things like the order of statements or what's
exactly inside the statement affects the outcome.  In any case after
much tweaking I got my router to work, and here is my complete
rc.conf.  People on this mailing list have helped me come up with my
rc.conf (thank you all):

ifconfig_bridge0="addm fxp0 addm fxp1 addm re0 addm ath0 up"
ifconfig_ath0="ssid speedy.i mode 11g mediaopt hostap channel 2 -bgscan up"

The ath0 stuff is for a wireless access point and is not needed in
your case.  The rest you can probably understand.

fxp2 is the external facing interface, it's what is connecting to AT&T
UVerse via DHCP.

The line "ipv4_addrs_bridge0" is important and from what I recall it
needs to come after the interfaces are brought up, just like in the
above rc.conf.

Of course there is also some dhcpd config that is not present here.

If you still can't get it to work, try disabling dhcpd to have a
static IP network, try getting that to work first.  Then add dhcpd
once the static network is working.

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