Date: Sat, 25 May 2002 21:18:58 +0200 From: Gerhard Sittig <Gerhard.Sittig@gmx.net> To: stable@freebsd.org Subject: Re: 4.6-PRERELASE fxp alias woes Message-ID: <20020525211858.N1494@shell.gsinet.sittig.org> In-Reply-To: <200205240009.g4O09Kb2081251@wattres.Watt.COM>; from steve@Watt.COM on Thu, May 23, 2002 at 05:09:20PM -0700 References: <5.1.0.14.2.20020513142059.03741410@127.0.0.1> <200205240009.g4O09Kb2081251@wattres.Watt.COM>
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On Thu, May 23, 2002 at 17:09 -0700, Steve Watt wrote:
>
> In article <5.1.0.14.2.20020513142059.03741410@127.0.0.1> you write:
> >network_interfaces="fxp0 lo0"
> >ifconfig_fxp0="inet 216.109.194.4 netmask 255.255.255.0"
> >ifconfig_fxp0_alias0="inet 216.109.194.8 netmask 255.255.255.0"
>
> As everyone has pointed out, the kernel is now enforcing netmasks on
> same-subnet aliases.
>
> But I've got a really simple question: Why, if it is so easy to detect
> programatically, do we not just *fix* it automagically? Is there *ever*
> a case where it is useful to have a same-subnet alias with a different
> subnet mask (besides the obvious point of it doesn't work with the
> current code).
Huh? I trust a computer to detect _that_ there are collisions.
But I'd *never* trust the machine to decide _which_ one of
multiple parameters is the wrong one. This would be some kind
of "no matter what I tell you, do what I mean" or even worse
"don't take me too serious, do what you think I meant". This
is definitely not the UNIX way. If you wish for this kind of
features, don't hesitate to install a different OS on your
machine. :>
> In other words, is there some useful future behavior that such a change
> would make unpleasant/undoable?
You seem to miss the point of applying an alias to your NIC
which lives in a different network than the primary address.
That's when a netmask different from 255.255.255.255 makes
perfect sense and actually is required.
virtually yours 82D1 9B9C 01DC 4FB4 D7B4 61BE 3F49 4F77 72DE DA76
Gerhard Sittig true | mail -s "get gpg key" Gerhard.Sittig@gmx.net
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