Paul Flo Williams wrote:
> [tim@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.
But I get the DF set response even if I don't use the -M option:
----------------------------------------------------------
[tim@mary etc]$ ping -s 1466
www.google.com
PING
www.l.google.com (74.125.39.99) 1466(1494) bytes of data.
From homegate.homenet.telecomitalia.it (192.168.1.1) icmp_seq=1 Frag
needed and DF set (mtu = 1492)
^C
----------------------------------------------------------
Nb I have solved the problem, as I mention elsewhere in the thread.