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security ideas for Linux router?


I got an awesome deal today on a Linksys wired Etherfast Cable/DSL
router and 4 port switch - $5 USD at our local Goodwill Computer Store.
They get donations and then sell them (they are a non-profit corp. that helps
the disabled). The model number is: BEFSR41 version 3.

What exactly can I do with this in Linux? I have 2 computers and would
like to network them using this.

It came with a 6 foot ethernet cable and a 12V power adapter. Any ideas
and/or pointers on what to do to set this up in Linux would be great.
Right now I have raw ethernet frames being sent to my laptop which is
using static IP so I have nothing in the way:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface   U     0      0        0 eth0         UG    0      0        0 eth0

My eventual goal is to setup a DMZ network and route my public network
traffic behind that but for the present I just want to get my 2
computers sharing the DSL line using this router I got.

Here is my planned DMZ setup:

PS: The Goodwill store has a 20 port Agilent switch (still wrapped in
plastic in the box) for $20.
Is that also a good deal?


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