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Re: kern/40139: bridge(4) does not transmit DHCP replies to tap(4)
The following reply was made to PR kern/40139; it has been noted by GNATS.
From: Quentin Garnier <cube%cubidou.net@localhost>
To: David Young <dyoung%pobox.com@localhost>, gnats-bugs%NetBSD.org@localhost,
Taylor R Campbell <campbell%mumble.net@localhost>
Subject: Re: kern/40139: bridge(4) does not transmit DHCP replies to tap(4)
Date: Sat, 21 Mar 2009 21:59:54 +0100
Content-Type: text/plain; charset=us-ascii
On Sat, Mar 21, 2009 at 03:50:54PM -0500, David Young wrote:
> On Sat, Mar 21, 2009 at 07:10:06PM +0000, Quentin Garnier wrote:
> > The following reply was made to PR kern/40139; it has been noted by GNA=
> > From: Quentin Garnier <cube%cubidou.net@localhost>
> > To: gnats-bugs%NetBSD.org@localhost
> > Cc:=20
> > Subject: Re: kern/40139: bridge(4) does not transmit DHCP replies to ta=
> > Date: Sat, 21 Mar 2009 20:09:51 +0100
> > On Tue, Dec 09, 2008 at 09:00:01AM +0000, Taylor R Campbell wrote:
> > > >Number: 40139
> > > >Category: kern
> > > >Synopsis: bridge(4) does not transmit DHCP replies to tap(4)
> > =20
> > It's not an issue with tap(4) (the same happens if you replace it with
> > any other Ethernet interface). If you run ktrace on dhclient, you'll
> > see that it receives the packet on its udp socket for port 68. I don't
> > know why it rejects it though.
> dhclient does not log any complaints about those packets?
No. ktrace shows it going almost directly back to select(2) after the
> Some NICs pass the FCS to the host in promiscuous mode, but not
> otherwise. Their drivers neither apply M_HASFCS nor trim the ethernet
> checksum from the input mbufs when the NIC is in promiscuous. bridge(4)
> may conceal or compound the defect in those input mbufs.
Yeah, I have machines on which dhclient complain about getting 4 extra
bytes. It's not fatal though.
Quentin Garnier - cube%cubidou.net@localhost - cube%NetBSD.org@localhost
"See the look on my face from staying too long in one place
[...] every time the morning breaks I know I'm closer to falling"
KT Tunstall, Saving My Face, Drastic Fantastic, 2007.
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