Oversize frame issues

darrendavid · May 25, 2006, 3:17 PM

hey all-

i'm using pfsense BETA4 on a soekris box to redirect packets from the WAN to an internal FBSD 5.4 server. Sicne the cutover to pfsense, I've noticed an endless stream of:

frizzle kernel: em0: discard oversize frame (ether type 800 flags 3 len 1514 > max 1506)
frizzle kernel: em0: discard oversize frame (ether type 800 flags 3 len 1514 > max 1506)
frizzle kernel: em0: discard oversize frame (ether type 800 flags 3 len 1514 > max 1506)
…

on my FBSD machine. Can I/Do I need to massage the MTUs in pfsense to fix this?

d.

sullrich · May 25, 2006, 8:47 PM

You may want to track down the box that is spewing the large packets and change the mtu down to 1500.

darrendavid · May 26, 2006, 5:05 AM

is there a way to change the MTU of the interface in pfsense?

sullrich · May 26, 2006, 5:08 AM

On all interfaces except LAN. And even then I think it only kicks in if an optional interface is a WAN interface.