Given a simple, switched LAN with Debian Linux (sid, iputils-ping) and Microsoft Windows XP (Service Pack 2, with the Windows Firewall disabled). A user complains about the network being slow (meaning his Windows notebook). I quickly find out that I can ping the box from my Linux notebook if my -s parameter is < 1393 or > 1472. If it's between 1393 and 1472, no replies are received.
I spend the next hour with debugging this not so interesting phenomenon.Continue reading "Weird networking MTU issue"