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  1. Kludge

    Nortel Extranet (VPN) over LAN to DSL router to Corp WAN

    ESP can be routed over NAT, just not AH. Remember, NAT changes every packet by modifying the header and when IPsec examines the packet it will discard any one's which have been tampered with. ESP just encrypts the payload which NAT is not concerned with. Just turn off AH authentication and you...

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