Thank you Stefan! Below is explanation how I should configure my bridge(4). That was exactly my issue, dhcpd(8) was running on sis0, which didn't had cable plugged in. Now I'm using vether(4) and all works like a charm.
On Tue, Aug 24, 2010 at 10:55:01PM +0200, Stefan Sperling wrote: > re http://marc.info/?l=openbsd-misc&m=128260593928878&w=2 > (sorry not subscribed to misc so this mail has no in-reply-to headers) > > I've hit the same problem some time ago. > > The root of the problem is related to the way network drivers call bpf(4) > hooks. Drivers need to pass packets to bpf so that dhcpd can see them. > Some drivers always pass packets to bpf, but some only do so if the link > state of the interface is up. This means that with some drivers, dhcpd will > see packets only if the interface it is listening on has a cable plugged > into it. E.g. my net5501 soekris with dhcpd listening on vr0 could only > serve DHCP when the vr0 interface had a cable plugged into it (so for a > while I patched the vr driver to always call the bpf hook, but that's a > crude workaround...) > > But as of 4.7, we have vether(4), which nicely solves this problem. > Try putting your dhcpd on a vether interface, and add the vether > interface to the bridge. Then dhcpd should see packets from all other > bridge member interfaces just fine. You can add the router's IPs to the > vether interface -- the other bridge ports don't need to have IP addresses. > You can think of the vether interface as an additional port of the bridge > which can safely be used by the machine itself. Below my current setup which works under: OpenBSD 4.8 (GENERIC) #136: Mon Aug 16 09:06:23 MDT 2010 dera...@i386.openbsd.org:/usr/src/sys/arch/i386/compile/GENERIC ==> /etc/hostname.bridge0 <== description "link to virtual hosts" add vether0 add sis0 add sis1 add sis2 add sis3 up ==> /etc/hostname.sis0 <== up description "part of bridge0" ==> /etc/hostname.sis1 <== up description "part of bridge0" ==> /etc/hostname.sis2 <== up description "part of bridge0" ==> /etc/hostname.sis3 <== up description "part of bridge0" ==> /etc/hostname.vether0 <== inet 192.168.110.1 255.255.255.0 NONE description "part of bridge0" inet alias 192.168.3.1 255.255.255.0 ==> /etc/hostname.vr0 <== dhcp description "internet uplink" ==> /etc/hostname.vr1 <== inet 192.168.101.1 255.255.255.0 NONE description "link to net4511" ==> /etc/hostname.vr2 <== inet 192.168.102.1 255.255.255.0 NONE description "link to linksys" ==> /etc/hostname.vr3 <== inet 192.168.103.1 255.255.255.0 NONE description "link to netgear switch" # grep ^dhcpd /etc/rc.conf.local dhcpd_flags="vr1 vr2 vr3 vether0" # enabled -- best regards q#
