firewall protect private network

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From: Jeff Liebermann <jeffl@comix.santa-cruz.ca.us>
Newsgroups: comp.unix.sco.misc
Subject: Re: Protect private network
Date: Wed, 02 Aug 2000 23:12:34 -0700
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On Wed, 2 Aug 2000 17:27:48 -0400, "Raymond A. Biondi" <biondi@ncweb.com>
wrote:

>The main question is the strategy.  Create gateway machine,
>email box, web box, dns box, room full of boxes, closet full
>of boxes, etc.

Lots of choices...

1.  Let the OSR5 server act as a router/firewall/NAT.
This requires that you install a 2nd ethernet card in your OSR5 box.
Download TLS709 for IPFilters and NAT (network address translation).  For
clues and config details, see:
  http://coombs.anu.edu.au/~avalon/ip-filter.html
  /Security/ipfilter.html
This will NOT work if you happen to be cursed with PPPoE as SCO does NOT
have a PPPoE dialer.

2.  Cheap stand alone hardware ethernet router/firewall/NAT.  My
favorites of the cheap variet are:
        Linksys BEFR41/BEFR44  ($120/$180)
        Netgear RT311  ($120)

3.  Much better hardware ethernet router/firewall/NAT with stateful
inspection, content filtering, etc.
        Sonicwall/10  ($420)

4.  Do it thyself router/firewall/NAT on a floppy (no hard disk).  Linux
based.  I use:
        http://www.freesco.org
because I've hacked it for handling 5ea ethernet cards.  Web or menu
configurable.  486DX2/66 with 16MB for 10baseT.  P133 with 16MB for
100baseT.  See:
        http://www.freesco.org/links
for other single floppy routers.  I've also used:
        http://www.linuxrouter.org
but found it complicated to configure.

>Know of any good books?  Areas to search?
        http://www.dslreports.com
        http://Cable-DSL.home.att.net/#HardwareFirewalls

>I have compiled a designed based on years of SysAdmin mags
>but that could be overkill, not enuff kill, or just plain roadkill!

Even the minimum level of firewall is effective if you don't punch any
holes in it.  It's when you want to do VPN, RAS, PCAnywhere, ftp, telnet,
etc from the internet where the security problems begin.  Just do it.

Also, if you have a 10baseT ethernet card in your OSR5 machine, you will
need to increase the default receive window from 4KB to 32KB using
"inconfig".  I posted details on this about 2 weeks ago.  Search Deja
News for "inconfig" for instructions.  If you have a 100baseT card,
you're probably OK at 24KB.


-- 
Jeff Liebermann   jeffl@comix.santa-cruz.ca.us
150 Felker St #D  Santa Cruz CA  95060
831-421-6491 pager   831-429-1240 fax
http://www.cruzio.com/~jeffl/sco/   SCO stuff

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