Hello.
Today I experienced something weird (at least for me) on a 8.4 system:
_ the system had vlan3 interface, with default MTU (1500 bytes);
_ "ping -D -s 1400 somehost" would work, but "ping -D -s 1500 somehost"
would yield "frag needed and DF set" (forgive me if the message is not
exact, I don't have it anymore);
_ to make some tests I reduced MTU size with "ifconfig vlan3 mtu 500";
_ now, of course, "ping -D -s 400 somehost" would work, but "ping -D -s
500 somehost" would yield "frag needed and DF set";
_ then I raised MTU again with "ifconfig vlan3 mtu 1500" (notice
ifconfig would actually report this as "mtu 1500" was shown);
_ however the results were as before, i.e. "ping -D -s 400 somehost"
would work, but "ping -D -s 500 somehost" would yield "frag needed and
DF set";
_ no way I could ping with a packet bigger than 500 bytes until I rebooted.
Is this expected behaviour? Any way to get around this?
bye & Thanks
av.
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