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<H1>[Mageia-discuss] Odd entry in log file</H1>
<B>imnotpc</B>
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TITLE="[Mageia-discuss] Odd entry in log file">imnotpc at Rock3d.net
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<I>Tue May 8 21:28:19 CEST 2012</I>
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<PRE>On 05/08/2012 03:17 PM, Maarten Vanraes wrote:
><i> Op dinsdag 08 mei 2012 02:05:44 schreef imnotpc:
</I>><i> [...]
</I>>>><i> promiscuous mode means you're passing through from layer 2 to layer 3
</I>>>><i> irrespective of mac address (ie: even if it's not for you)
</I>>>><i>
</I>>>><i> iptables is not complaining
</I>>>><i>
</I>>>><i> martians is kernel level, (resource path filtering (for asynchronous
</I>>>><i> routing)), before iptables even comes into play.
</I>>><i> So the kernel would log the martian before iptables sees it? That
</I>>><i> explains why it isn't dropped by the firewall. But that begs the
</I>>><i> question, is there any point in using iptables rules to block packets
</I>>><i> from other subnets if iptables will never see them? Just about every
</I>>><i> sample firewall ruleset I've ever seen does this either explicitly or by
</I>>><i> allowing them to fall through to the default DROP rule. Now that I'm
</I>>><i> thinking back, in 10+ years of Linux LAN experience I've never seen a
</I>>><i> martian packet logged by any of my firewalls. i just assumed it was good
</I>>><i> network management ;-)
</I>><i> yes, because rp_filter level can be adjusted in the kernel :-)
</I>><i>
</I>Ah, so it was my good network management then, hehe. Good info, thanks.
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