IPv6 and IP aliases in 2.1.1[23]

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Jeff> Here's an interesting way to blow up your box, providing
Jeff> IPv6 is a module:

Jeff> ifconfig eth0 up 192.168.1.1 ifconfig eth0:0 up 192.168.1.2
Jeff> modprobe ipv6 ifconfig eth0 down ifconfig eth0 up
Jeff> 192.168.1.1 ifconfig eth0:0 up 192.168.1.2 *kaboom*

Jeff> Anyone wanna take a look at this one? :)

Don't worry. I've got a patch for it already. Should go into 2.1.<next>.

./Pedro.

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