MTU is the maximum transmission unit. If it's too high, PSO can freak out and either crash every time you try to load a quest or corrupt your character, turning you into a fat orange HUmar and forcing you to remake your character and start over. If you're using DreamPi, you can SSH into the Pi and issue this command to change the MTU:
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sudo ip link set dev eth0 mtu 1400 (replace eth0 with wlan0 if your Pi uses Wi-Fi)
If it helps, you can add the command to /etc/rc.local to make it permanent. Don't change this unless you've tried everything else first, and definitely back up your save file first, too. If you use BBA, then you have to mess with your router settings, and the way to do that varies from router to router.