Re: ioctl SIOCGIFNETMASK: ip alias bug 2.4.9 and 2.2.19

Alan Cox (alan@lxorguk.ukuu.org.uk)
Thu, 6 Sep 2001 15:51:38 +0100 (BST)

> > > Even if it checked the address it would not be unique because you can have multiple
> > > interfaces with the same addresses but different netmasks.
>
> The same IP address with different netmasks on the same hardware
> interface? The mind boggles. How does one handle broadcasts?

Same as before. You have two for a single IP address/netmask
(255.255.255.255 and the local one). You have another per address/mask pair
you add.

The application supplies a target broadcast address so there isnt any real
problem
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