Date: Fri, 6 Feb 2004 03:56:55 +0200 From: Ruslan Ermilov <ru@freebsd.org> To: Brooks Davis <brooks@one-eyed-alien.net> Cc: current@freebsd.org Subject: Re: VLAn support for atheros/Prism? Message-ID: <20040206015655.GA25623@FreeBSD.org.ua> In-Reply-To: <20040206004924.GB20813@Odin.AC.HMC.Edu> References: <20040203213456.GT50677@backmaster.cdsnet.net> <200402051417.00117.sam@errno.com> <20040206003112.GU50677@backmaster.cdsnet.net> <20040206004924.GB20813@Odin.AC.HMC.Edu>
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--/04w6evG8XlLl3ft Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Feb 05, 2004 at 04:49:26PM -0800, Brooks Davis wrote: > On Thu, Feb 05, 2004 at 04:31:12PM -0800, mrcpu@cdsnet.net wrote: > > Well, I'm just looking through the specs of the microtik stuff, and they > > say they have vlan support over wireless now. > >=20 > > I can fudge the VLAn support, at the cost of a reduced MTU using the > > "software emulation" vlan tagging, or whatever it is that FreeBSD does, > > and bridge those packets, but that's not the same as true hardware VLAN > > tagging. >=20 > You've got a serious misconception about how vlans work. The only > hardware support that is required is support for a wire MTU of 1504 > bytes so the tag fits on the packet without reducing payload size. Some > interfaces have support for removing the tag from the packet for you and > indicating the tag out of band, but that's only an optimization. >=20 I think the originator is asking why IFCAP_VLAN_MTU is not set by the ath(4) driver (I've only checked with grep(1)), is it due to a hardware limitation, or due to the driver? Cheers, --=20 Ruslan Ermilov FreeBSD committer ru@FreeBSD.org --/04w6evG8XlLl3ft Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (FreeBSD) iD8DBQFAIvRnUkv4P6juNwoRAhiXAJ0dxsE8P+DjSGyBO1oqYTSe4ey3ggCfWOO+ goVsaWCGkL7xdwk++EpXPQA= =EjP8 -----END PGP SIGNATURE----- --/04w6evG8XlLl3ft--
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