[gentoo-user] Recommended VPN Tunnel client?

[Pandu Poluan <pandu@poluan.info>]

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Scenario: I have a server in the cloud that needs to connect to an internal
server in the office. There are 2 incoming connections into my office, ISP
"A" and ISP "B". The primary connection is A, but if A goes down, we can
use B. The app running on the cloud server has no automatic failover
ability (i.e., if A goes down, someone must change the app's conf to point
to B).

My thought: If I can make a tunnel from the server to the FortiGate
firewall currently guarding the HQ, the cloud app can simply be configured
to connect to the internal IP address of the internal server. No need to
manually change the app's conf.

The need: a VPN client that:
+ can selectively send packets fulfilling a criteria (in this case, dest=
IP address of internal server)*
+ has automatic failover and failback ability

*solutions involving iptables and iproute2 are also acceptable

Can anyone point me to the right direction re: what package and the
relevant howto?

Thanks in advance.

Rgds,

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