what is "unplumb" - IP Networking

tommy_cs · #1 (**permalink**) 02-15-2008

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

blowtorch · #2 (**permalink**) 02-15-2008

From the Solaris man page:

Quote:

plumb Open the device associated with the physical interface
name and set up the streams needed for IP to use the
device. When used with a logical interface name, this
command is used to create a specific named logical
interface. An interface must be separately plumbed for
use by IPv4 and IPv6. The address_family parameter
controls whether the ifconfig command applies to IPv4
or IPv6.

Quote:

unplumb
Close the device associated with this physical inter-
face name and any streams that ifconfig set up for IP
to use the device. When used with a logical interface
name, the logical interface is removed from the sys-
tem. After this command is executed, the device name
will no longer appear in the output of ifconfig -a.

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

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