BGE & VLAN stranges

[Boris Kovalenko]

Will Saxon wrote:
Hello!

    Have checked both MTU on Catalyst 2950 and BGE interface. Both are 
1500. Also, I have no problems with 1500 MTU on FreeBSD 4.8R and FXP 
driver.

Yours truly,
    Boris

>>-----Original Message-----
>>From: Boris Kovalenko [mailto:boris at tagnet.ru]
>>Sent: Friday, August 01, 2003 2:23 AM
>>To: freebsd-stable at freebsd.org
>>Subject: BGE & VLAN stranges
>>
>>
>>Hello!
>>
>>  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?
>>    
>>
>
>Boris,
>
>This sounds normal - your vlan probably has a max MTU of 1464 bytes (one of the ethernet standards uses this instead of 1500 I think). If you want to transmit larger frames, you have to up the MTU on your adapter and on the switch somehow. I think this is referred to as 'jumbo frames.'
>
>If you set the adapter MTU to 1464 you should not have problems sending and receiving, your packets will just get fragmented.
>
>-Will
>
>  
>