Re: [PATCH 0/2] IPv6 conntrack support for neighbour discovery

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On Fri, 23 Jan 2009, Eric Leblond wrote:

> > How about just using NOTRACK target ?
> 
> This is a possible solution but you will then have to be a Netfilter
> Jedi to build a correct IPv6 filtering ruleset. I think even Padawan
> have no clue about the existence of the NOTRACK target.
> 
> Seriously speaking, the NOTRACK target is tagged "NETFILTER_ADVANCED"
> and IPv6 is becoming more and more frequent. I don't think we should use
> such a complicated solution for simply obtaining an IPv6 address. We
> will loose quit a bunch of users on this.

RFC4890, Recommendations for Filtering ICMPv6 Messages in Firewalls, deals 
with ICMPv6 filtering on firewalls in details and even contains a sample 
ip6tables script.

Wouldn't it make sense to add simply the RFC to the iptables source tree, 
and a sentence to the ip6tables manpage saying:

"Please read RFC 4890 and the sample script in it on how to filter ICMPv6
properly in an IPv6 environment."

Best regards,
Jozsef
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