> > On Tue, Feb 27, 2001 at 07:16:14AM +0100, Rogier R. Mulhuijzen wrote:
> > >
> > > > [ Matt Emmerton wrote: ]
> > > >The point is that you need to use a netmask of 255.255.255.255 for
aliased
> > > >IPs on FreeBSD, regardless of the alias of the primary (non-alias)
IP.
>
> no this is incorrect. you just have to make sure that the aliased
> IP&mask do not generate info which is already in the routing table.
> E.g. if your primary addr is 1.2.3.4/24 , an alias of 1.2.3.5/24 will
> give a warning, but an alias of 1.2.4.4/24 will not, and most likely even
> 1.2.3.5/25 will not.
I'm just reiterating what I was told 1.5 years ago when I complained that
the following setup wouldn't work:
Primary IP: 192.168.0.1/255.255.255.0
Aliased IP: 192.168.0.10/255.255.255.0
With this setup, I could not ping, traceroute or connect to the aliased IP.
In order to make the aliased IP functional, I had to use a netmask of
255.255.255.255 -- a fact which I find totally confusing and
counter-intuitive, but one that seems to work.
> > > Everybody is saying use 255.255.255.255 for an alias. Noone is giving
> > > reasons why.
Exactly. I never got a good answer to this when I first stumbled upon it,
and I still haven't. All I know is that this is the way it needs to be done
in order for things to work properly.
--
Matt Emmerton
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