Re: Quick question about IP aliasing

[Luigi Rizzo]

> On Tue, Feb 27, 2001 at 07:16:14AM +0100, Rogier R. Mulhuijzen 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.

> > 
> > Everybody is saying use 255.255.255.255 for an alias. Noone is giving 
> > reasons why.
> 
> I don't understand this either.  To my mind it's a bug if it doesn't
> work with the full netmask for an IP alias address.

it does work, you just have tomake sure that you use the
correct parameters.

        cheers
        luigi

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