Date: Wed, 12 Jul 2006 09:19:14 +0300 (EEST) From: Dmitry Pryanishnikov <dmitry@atlantis.dp.ua> To: =?ISO-8859-1?Q?Sten_Daniel_S=F8rsdal?= <lists@wm-access.no> Cc: freebsd-net@freebsd.org Subject: Re: if_rl VLAN support in RELENG_4 Message-ID: <20060712091022.A65006@atlantis.atlantis.dp.ua> In-Reply-To: <44B4882F.6060200@wm-access.no> References: <20060705125957.T30599@atlantis.atlantis.dp.ua> <44B4882F.6060200@wm-access.no>
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Hello! On Wed, 12 Jul 2006, Sten Daniel S?rsdal wrote: >> In RELENG_4, RealTek 8129/8139 driver rl(4) doesn't claim VLAN support >> (when I assign vlandev rl0, my vlan device initially gets mtu 1496). In >> modern (e.g. RELENG_6) systems if_rl claims native VLAN support. I've >> tried setting 'ifconfig vlan0 mtu 1500' for rl-based vlan device, and >> resulting interface Just Works (TM) (1500-byte packets trasmit and receive >> correctly via such a vlan). So is it safe to use vlan with 'vlandev rl0' >> and 'mtu 1500' in RELENG_4? Has anyone observed any ill-effects in such >> a configuration? Would it be simple enough for if_rl in RELENG_4 to >> just announce native VLAN support to the system? >> >> Sincerely, Dmitry > > Not necessarily. I would assume, without looking, that you would also > need to enable oversized frame support. I'm curious whether you've missed the following: >> I've >> tried setting 'ifconfig vlan0 mtu 1500' for rl-based vlan device, and >> resulting interface Just Works (TM). So the required support seems to be already enabled (at least for my particular NIC). It isn't question for me whether _my_ NIC works in this mode - it definitely does. My question is whether _any_ rl(4)-supported card will behave in the same way ( = can I _rely_ on rl(4) in RELENG_4 being able to do 1500-byte VLANs). In RELENG_6, e.g., this capability is announced by the rl(4), so I can rely on it. But it seems to be an overkill to upgrade an average not-so-fast router to RELENG_6 just to be sure that rl(4) supports 1500-byte VLANs correctly, isn't it? Sincerely, Dmitry -- Atlantis ISP, System Administrator e-mail: dmitry@atlantis.dp.ua nic-hdl: LYNX-RIPE
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