Re: [PATCH 2/3] netfilter: xtables: add PKTTYPE target

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Pablo Neira Ayuso wrote:
Patrick McHardy wrote:
Jozsef Kadlecsik wrote:
On Tue, 10 Feb 2009, Patrick McHardy wrote:

Yes, I know, I'm just wondering why you're using TCP at all for
synchronizing. Its not for traffic from the Internet I assume
since the node it ends up on is unknown to the outside anyways.
No, that's not the syncronizing traffic, but the "normal" TCP traffic
to be filtered by the firewalls, which have got multicast MAC
addresses on their interfaces.
Multicast traffic is accepted for forwarding just fine, its just
local TCP delivery thats refusing it. So it can't be forwarded
traffic.

You usually have some administration facility (like ssh) that would
break. Please, think that this can be also used to replace CLUSTERIP (to
be used in back-end servers, not only stateful firewalls).

I see. Still, this module has only one purpose, which is to circumvent
valid checks to make a different hack (although a nicer one) work.
Perhaps simply move it into the cluster match (yes yes, I know). That
way we can also avoid a bit of the new-module overhead.
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