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(I am not too familiar with SSH Sentinel client). Nevertheless, it is obvious that the problem is not IP tables or routing but the configuration of the FreeSwan VPN server. Typically the FreeSwan software (IPsec for Linux) is easy to configure in secure gateway mode; it can connect to another IPsec enabled secure gateway. To support "road warrior" mode, you need a FreeSwan version that will support "remote access IPsec". When I was working with VPN development a few years ago, it was possible to do this with FreeSwan but it takes a lot of nitty-gritty configuration on both ends (client and server). Please refer to the FreeSwan Web site for more information on how to configure FreeSwan IPsec for remote access VPN. www.freeswan.org.
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