Date: Mon, 26 Feb 2001 17:29:58 -0800 From: Justin C.Walker <justin@mac.com> To: <Freebsd-Net@Freebsd.Org> <freebsd-net@freebsd.org> Subject: Re: Quick question about IP aliasing Message-ID: <20010227055759.FFEA10024.femail11.sdc1.sfba.home.com@lilith> In-Reply-To: <NCBBLOALCKKINBNNEDDLAEJIDLAA.jonathan@graehl.org>
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I think that Roger meant something like:
"... instead, or ..." <-- "," added.
He's saying they are the same.
FWIW, there used to be an "IP alias" tutorial (not the "pedantic ppp"
tutorial) referenced from the freebsd web site, but it's disappeared.
The former went into a bit of detail on what is going on when you
install an alias.
Basically, it's like this (the essence of this has already been
mentioned):
- if you install an alias on an interface whose network number matches
an existing address, you can do one of two things:
-- specify the netmask as "-1"
-- specify the "correct" netmask, ignore the returned error (the
alias is installed), and then add an appropriate route for the new
address. The former seems like less work.
- if the alias is not on an existing subnet, then use the correct
netmask.
For the original requestor's case, the first alias is installed with the
"correct" netmask, and the subsequent ones (on the subnet defined by the
first alias) get installed with the "-1" netmask.
Regards,
Justin
On Monday, February 26, 2001, at 05:09 PM, Jonathan Graehl wrote:
>> do 'netmask 255.255.255.255' instead or 'netmask 0xffffffff' since
>> this is
>> an alias... for some reason otherwise services may not bind to the ip
>> correctly
>
> Why would this be? The two are numerically equivalent.
>
> -Jon
>
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