Crib-Notes: Tuning MTU-size on EL7-based DHCP Clients

Because:

• One of the networks I deal with is broken
• I have only about a 15% hit-rate of what I actually need whenever I try to re-find the info
• most of my Google hits seem to think that using `ip link set...` is a fine, long-term solution and the ones that point to persistency referenc either nmcli or the /etc/sysconfig/network-scripts file

Need to save this here (maybe by doing so, Google will at least return this page when I need to re-search)...

To override the default MTU (in my case turning off Jumbo frames), edit the /etc/dhcp/dhclient-eth0.conf file like so:

interface eth0 {
    supersede interface-mtu 1350;
}

Reboot and everything should be fine (actually able to vi a file, use man pages, etc., without locking up my SSH session!).