Date: Sat, 02 Aug 2003 01:38:21 -0700 From: Terry Lambert <tlambert2@mindspring.com> To: Boris Kovalenko <boris@tagnet.ru> Cc: freebsd-current@freebsd.org Subject: Re: bge & vlan stranges Message-ID: <3F2B787D.D1C4BCAC@mindspring.com> References: <3F2A2B17.4020700@tagnet.ru>
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Boris Kovalenko wrote: > I have Compaq DL360G2 with Broadcom BCM5701 Gigabit Ethernet and > FreeBSD 5.1R installed. There are no problems if I use bge as usual > network card, but when I try to use 802.1Q vlans, I can't receive (only > receive, sending is ok) packets more then 1456 bytes! What is the > problem? BGE driver, VLAN driver or my network configuration? The encapsulation information is subtracted from your available MTU, so that is correct. Some cards have a bogus feature that lets you send longer frames than the normal MTU, but you can't rely on this feature being interoperable between card vendors, or being supported on all cards. I suppose you want to do this because you are trunking a channel that goes to a border device, and for some reason you have disabled receipt of all ICMP, instead of only abusable ICMP, and thus you have broken end-to-end path MTU discovery. It would be best if you were to simply fix your ICMP. -- Terry
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