VPN questions

[Erik Norgaard]

Hi,

I am looking at how to implement VPN but I'm getting confused as to how
IPSec, IKE, OpenSSL, FreeSWAN, racoon etc. all fit into the picture. I
am looking at two scenarios, and I have two questions.

1) Standard IPSec tunnel:

             +----+ IPSec/VPN +----+
       LAN---| FW |-----------| FW |---LAN
             +----+           +----+

In this scenario: Can CARP/pf handle VPN/IPSec connections incase the
master unit fails? (I am assuming that both ends have fixed public
routable ip's).

2) VPN for mobile users

            +----+    VPN    +-----+
      LAN---| FW |-----------| FW? |---[mobile unit]
            +----+           +-----+

For mobile users I can't be sure where they are, their ip, or if they
are behind NAT/firewall, nor can I trust the network until the mobile unit.

IPSec breaks behind NAT, are there other altertives than ssh-tunnels I
should take a look at? (which? :-)

Thanks, Erik
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