Timothy Murphy wrote:
[...@mary tmp]$ ping -s 1466 -c 3 -M do www.google.com PING www.l.google.com (74.125.39.104) 1466(1494) bytes of data. From homegate.homenet.telecomitalia.it (192.168.1.1) icmp_seq=1 Frag needed and DF set (mtu = 1492) Incidentally, what exactly does "DF set" mean? Is it telling me that DF is set, or that it should be set (or even, should not be set)? If the latter, how can I do that?
DF is the Don't Fragment bit in the IP header flags field. It's telling you that you set it (with -M do), so it can't fragment the packet.
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