Date: Wed, 28 Nov 2001 23:52:19 -0800 (PST) From: "Crist J. Clark" <cjc@earthlink.net> To: FreeBSD-gnats-submit@freebsd.org Subject: docs/32373: Bad ifconfig(8) alias advice in FAQ 10.9 Message-ID: <200111290752.fAT7qJd06994@blossom.cjclark.org>
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>Number: 32373
>Category: docs
>Synopsis: Bad ifconfig(8) alias advice in FAQ 10.9
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: freebsd-doc
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: doc-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Nov 29 00:00:02 PST 2001
>Closed-Date:
>Last-Modified:
>Originator: Crist J. Clark
>Release: FreeBSD 4.4-STABLE i386
>Organization:
>Environment:
System: FreeBSD blossom.cjclark.org 4.4-STABLE FreeBSD 4.4-STABLE #0: Wed Nov 7 14:50:28 PST 2001 cjc@blossom.cjclark.org:/usr/obj/export/stable/src/sys/BLOSSOM i386
>Description:
The FAQ says,
10.9. How can I setup Ethernet aliases?
Add netmask 0xffffffff to your ifconfig(8) command-line like the following:
# ifconfig ed0 alias 204.141.95.2 netmask 0xffffffff
This is incorrect. You use a netmask of 0xffffffff for aliases which
exist on the same logical network as a previously configured address
on the same logical network. The ifconfig(8) manpage gets it right,
alias Establish an additional network address for this interface. This
is sometimes useful when changing network numbers, and one wishes
to accept packets addressed to the old interface. If the address
is on the same subnet as the first network address for this
interface, a netmask of 0xffffffff has to be specified.
>How-To-Repeat:
http://www.freebsd.org/doc/en_US.ISO8859-1/books/faq/networking.html#ETHERNET-ALIASES
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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