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 |
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