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Network Security Firewalls
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Re: Is this a good firewall? (allowing in from dynamic host)

Subject: Re: Is this a good firewall? (allowing in from dynamic host)
Date: Wed, 23 Feb 2005 17:28:03 -0800
On Tue, 22 Feb 2005 12:38:45 -0600, Gina H Montgomery
<gmontgomery@gapsinc.com> wrote:
Hi Kevin -

One way to do this is to determine the WAN mac address of your cable
modem - the one associated with the 12-134345-112.nashville.comcast.com
hostname.  Then, inside your iptables script, filter based on -m tcp --
mac-source 00:11:22:33:44:55 to match any packets from your home.

whoa here.... he did not say the firewall was on the same subnet as the client.
MAC address matching is only good for devices on the same broadcast domain.
The firewall would only see the MAC of the next hop router.

-- 
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       -MCP

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