discarded oversize frames

Kyle Mott kyle at xraided.net
Mon Apr 18 22:06:45 PDT 2005

Have you found a solution to this? I am having the same problems on a 
machine very recently updated (cvsupped + buildworld on 4/14/2005):
kernel.log:Feb 25 13:46:40 trinity kernel: rl0: discard oversize frame 
(ether type 3db4 flags 3 len 8381 > max 1514)
kernel.log:Apr 10 14:27:37 trinity kernel: rl0: discard oversize frame 
(ether type 5a84 flags 3 len 2614 > max 1514)
kernel.log:Apr 18 16:17:53 trinity kernel: rl0: discard oversize frame 
(ether type 1867 flags 3 len 16941 > max 1514)

After the message, the machine becomes completely unresponsive and I 
have to do a power-off, power-on reset.


David Malone wrote:

>On Fri, Feb 25, 2005 at 10:00:34AM -0500, Jonathan Pater wrote:
>>fxp0: discard oversize frame (ether type 800 flags 3 len 1515 > max
>>Is this something I should be
>>worried about, or is it indicative of something else faulty in the local
>>network setup?
>This message is produced if the ethernet card receives a packet
>that is bigger than permitted by the MTU + the size of the ethernet
>header. For normal ethernet this means that packets should be <=
>1514 bytes.
>So, there are three ways to eliminate the the message:
>	1) Find the machine sending oversize packets and stop it.
>	2) Change the MTU on your interface using ifconfig, this
>	will only work if the other machines on the network expect
>	larget frames.
>	3) You could edit /usr/src/sys/net/if_ethersubr.c and remove
>	the code that prints this error and then recompile your
>	kernel.
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