(Specifically, ICMP Fragmentation-Needed packets.) But you can set the MTU on any machine. I believe the correct Linux invocation is "ip link set dev ethX mtu 1400", or whatever value you want to use. (Of course that's only if your distro uses iproute2, and it assumes ethX is the right interface name.)
You can check whether the MTU is working by trying to send out a large packet; if all ICMPs are dropped then pings won't work, but if not, ping's -s option may be useful. Otherwise, trying to send a huge UDP packet may work, depending on where you're sending it and what's listening on the other end (and whether it echos anything). |
