[ds6] Disabling link local IPv6 addresses

[nullv at gmx.com]

Noted. So I guess the only way to properly secure the network is to have seperate physical media. Thanks
------Original Message------
From: Peter Bieringer
To: nullv at gmx.com
Cc: ds6 at lists.deepspace6.net
Cc: users at lists.fedoraproject.org
Subject: Re: [ds6] Disabling link local IPv6 addresses
Sent: Jan 10, 2012 10:08 PM

Hi,

Am 10.01.2012 11:00, schrieb nullv at gmx.com:
> Hi,
>
> I've been using radvd to set up a group of clients using RA broadcasts. I also have a group of client PCs using static IPv6 in a different ::/64 subnet altogether but on the same physical network. The two networks have to remain separate for security reasons.
>
> The problem I'm having is that clients on the two separate networks can still "see" each other through the automatic link-local (fe80::) addresses. I've added the line IPv6_AUTOCONF=no to network&  my ifcfg-* files but I can't seem to stop this behaviour.

You mean you want to run 2 independend IPv6 network on the same physical 
link?

> Any hints, tricks, hacks, gotchas?

I suggest to use at least VLANs, because killing link-local address can 
kill neigbor and router detection.

But neither removing link-local nor VLAN will really increase security, 
an unfriendly client can sniff on the network and configure itself a new 
static IPv6 address (and in case the VLAN ID also), as long as broad- or 
allhost-multicast are running on the link.

Use local firewalling and permit only the link-local addresses of the 
participating clients can help you a little bit, but even link-local 
addresses can be faked (e.g. changing the MAC address on an interface).

Regards,
	Peter