Terry Lambert wrote: Hello!
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.
No, this is test machine, I have installed it two days ago and have firewall_type="OPEN" in my settings. So I have not disabled MTU path discovery You are speaking of. Nevertheless, what is "substracted from available MTU?" Why? The correct way it should work: 1500 bytes packet + 14 bytes ethernet header + 4 bytes CRC = 1518 bytes is standard ethernet frame and 1500 bytes packet + 14 bytes ethernet header + 4 bytes 802.1Q tag + 4 bytes CRC = 1522 bytes of standard 802.1Q encapsulated frame. All 802.1Q realizations I know working the same.
-- Terry
Boris
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