Last night I was browsing the web and all of a sudden the Internet stops 
responding. So I go to the m0n0wall webGUI to see if the net went down 
or if it was something else. It was having the same response as the 
Internet, and I check the monitor for m0n0wall and it had the following 
error on it.

xl0: transmission error: 90
xl0: tx underrun, increasing tx start threshold to 120 bytes

I was just wondering if I had anything to worry about. or if it's just 
doing what it should be doing.

-Robert