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SubjectRe: [patch] 2.4 version of my duplicate IP and MAC detection patch
On Tue, 17 Oct 2000, Werner Almesberger wrote:

> Marc MERLIN wrote:
> > Come on, Andi, it's not. You do DAD, you get your IP, I plug my laptop, use
> > your IP, you don't even know it. My patch lets you know.
> > The reason I wrote it is that I've seen this happen too many times already.
> Also, if the network is not operational at the time you configure your
> interface, you don't notice duplicates, even if everybody carefully
> looks for them when bringing up or changing interfaces.
> This is a rather common situation at meetings, where wireless cards are
> mis-configured, hubs have no power, some of the cables are broken, and
> people who are blissfully unaware of any address allocation procedure
> enter the room and instantly try to set up their machines. (And of
> course nobody had time to prepare a DHCP server.)
> Thumbs up from me.

Another case where detecting duplicate IP addresses would be useful: this
machine was broken into yesterday morning, and reconfigured to take over
every IP address on the local subnet, then use all these addresses to
connect to Demon's IRCnet server. Detecting the duplicated IP addresses
and shouting about them would definitely have been welcome!


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