Date: Thu, 17 Apr 2003 20:34:47 -0400 From: Mike Tancsa <mike@sentex.net> To: Brooks Davis <brooks@one-eyed-alien.net> Cc: freebsd-net@freebsd.org Subject: Re: vlan0 on em0 has mtu 1496 Message-ID: <5.2.0.9.0.20030417202920.07adb1e0@marble.sentex.ca> In-Reply-To: <20030418001904.GA23983@Odin.AC.HMC.Edu> References: <16031.17219.159093.279782@canoe.velocet.net> <16031.17219.159093.279782@canoe.velocet.net>
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At 05:19 PM 17/04/2003 -0700, Brooks Davis wrote:
>On Thu, Apr 17, 2003 at 08:13:55PM -0400, David Gilbert wrote:
> > Why does a vlan created against em0 have a mtu of 1496.
>
>Because the vlan header takes up 4 bytes. With em(4) devices it looks
>like fixing that should be a simple matter of raising the real
>interface's MTU to 1504.
Why the difference in behavior vs how the fxp driver works with respect to
vlans ?
---Mike
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