what is "unplumb"

Applications IP Networking
1

I saw an example on the web, it is an HP-UX command:

ifconfig lan0 unplumb
ifconfig lan0 plumb

so what is plumb actually, I check HP-UX man page and still no idea.

What is the difference if I do in this way?

ifconfig lan0 down
ifconfig lan0 up

:confused:

2

From the Solaris man page:

The same would hold true for HP-UX as well (allowing for differences in implementation, and such).