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Date:      Sun, 22 Mar 1998 19:01:12 -0500 (EST)
From:      Brandon Lockhart <brandon@engulf.com>
To:        freebsd-isdn@FreeBSD.ORG
Subject:   fbsd
Message-ID:  <Pine.BSF.3.96.980322185318.10270A-100000@engulf.com>

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I have a question for all you ISDN users who use an isdn router for there
connection to the internet.  What I need to know is if this connection
scenario would work.

==isdn line===E Router ===E Computer #1 w/ freebsd & firewall
				\|/
				HUB
			       /   \
			     /`     '\
			Computer #2   Computer #3

Say I had 4 ip's.  My router was 1.1.1.1, #1 was 1.1.1.2, #2 was 1.1.1.3,
and #3 was 1.1.1.4.  On #1, would I make the gateway 1.1.1.1 (the router),
and then on #2 and #3, make the gateway 1.1.1.2?

What if I then got 1.1.1.5, and 1.1.1.6.  Could I assign those two IP's to
my FreeBSD machine using ifconfig, and then that is all.  Or do I have to
configure that in my router.

Now, if I had the basic setup,
                                 ___ #1
===isdn line====router====hub==='--- #2
                                `--- #3

With the router, could I filter out ALL incoming TCP connections to
computers 2 and 3, but allow everything except icmp packets to #1?  (deny
icmp all around, and tcp on 2&3)

Now, for this setting, with the same IP addresses, would my gateway on
them all be 1.1.1.1, and then just assign the ip addresses like normal?


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