Those commands do run and set the mtu = 9000 in ifcfg-eth0 properly.
ping tests between a debian nas and my main win pc work great.
" " the deb nas and sme don't.
" " sme and anything don't.
Win 8 file copy hangs too. So sme with this jumbo frames at 9000 unlike regular centos 6 or debian doesn't work.
Maybe samba needs a tweak or something else.
Tests ran used ping -M do -s 8972 <dest IP> and on win ping -f -l 9000 <dest ip>
What's the command to undo this change?