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Re: [Users] Re: Why does FreeSwan care about NAT? Was: Re: a "no suitable connection for peer" error

From: John D. Hardin (jhardin_at_impsec.org)
Date: Sun Apr 28 2002 - 04:09:30 CEST


On Sat, 27 Apr 2002, Maurice Volaski wrote:

> > Seems the problem is not with freeswan. All the problems are related to
> >IPSEC. IPSEC RFCs does NOT allow it to work when any of the machines are
> >NAT'ed .......
>
> Is this an April Fool's joke?

IPsec "does not work with NAT" is an overstatement of things. IPsec
"does not work *WELL* with NAT" and "may require special support on
the NAT system" are better. Note that the AH protocol specifically
will not work over NAT as the encrypted checksum includes the IP
addresses. ESP can work over a NAT connection.

Linux 2.2.x supports IPsec NAT (as Masquerade). See the technical
discussion of the issues involved in the VPN Masq HOWTO.

--
 John Hardin KA7OHZ    ICQ#15735746    http://www.impsec.org/~jhardin/
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