Date: Fri, 18 Jan 2002 00:05:31 -0500 From: "James F. Hranicky" <jfh@cise.ufl.edu> To: security@freebsd.org Subject: IPSEC into network behind the primary router Message-ID: <20020118050532.ECC9A6BAA@mail.cise.ufl.edu>
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I'd like to be able to set up an IPSEC gateway into my current network setup without making sweeping changes to the network topology, something like: ---------- [net 1]-| | | | | [internet]------[primary router] -------- [net 2]-| | | | | | | | ---------- [net 3]-| | | | | [ipsec tunnel box]-------------- What I'm wondering is if the following is possible: [ipsec client] | ---------- [net 1] 1.1.1.0/24 | | | M [internet]------[primary router] N------- [net 2] 1.1.2.0/24 A B O | | | | | ---------- [net 3] 1.1.3.0/24 | | | | | | | | | | X Y [ipsec tunnel/nat box] A = 1.1.4.1/30 X = 1.1.4.2/30 B = 1.1.4.5/30 Y = 1.1.4.6/30 The scenario: - random ipsec client initiates an ipsec tunnel with the ipsec tunnel box attached to my primary router - the packet hits interface X and is decrypted. The ipsec server decrypts the packet and finds it's destined for [net 1] with a source of [ipsec client]. - interface Y is set up nat, and the routing tables send packets destined for [nets 123] out interface Y with a source of Y and packets destined for [ipsec client] back out through interface X -- this way, packets originally from [ipsec client] don't go out interfaces [MNO] by mistake. I suppose if this doesn't work I'm left with transport mode and a gateway machine, or changing how I currently do routing for my site. Any help appreciated, ---------------------------------------------------------------------- | Jim Hranicky, Senior SysAdmin UF/CISE Department | | E314D CSE Building Phone (352) 392-1499 | | jfh@cise.ufl.edu http://www.cise.ufl.edu/~jfh | ---------------------------------------------------------------------- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
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