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Date:	Mon, 29 Oct 2007 14:03:37 -0400
From:	Vlad Yasevich <>
To:	netdev <>
Subject: Configuring the same IP on multiple addresses

Hi All

Does anyone have a reason why Linux allows one to configure
the same IP or IPv6 address on multiple interfaces?

For IPv4, since linux implements a weak host model, assigning
duplicate addresses doesn't make any sense, since the addresses
really belong to the host and not the interface.

For IPv6, I can see allowing duplicate link-locals since that's
perfectly valid from the protocol perspective.  However, duplicate
globals are shouldn't be allows from the perspective of the address

So, I am looking for technical reasons why this is permitted.

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