> I would like to use VPN at linux? > Do you know any recommendable program?
short answer: plenty...
(1) ssh tunnels, in particular tunneling PPP over ssh
(+) easy to setup
(-) only works linux-linux
(-) tunnels everything over tcp.
(2) CIPE
(+) comes with redhat.
(+) a bit better performances (UDP, not TCP like ssh)
(o) harder to setup then ssh, but not as hard as IPSEC ;-)
(-) no Windows support I know off.
(3) FreeSwan (IPSEC)
(+) full IPSec implementation. Very interoperaple.
(+) very flexible
(-) pain to setup
(-) problems with NAT
(4) PPTP (Microsoft VPN)
(+) works great with all versions of Windows.
(+) not hard to setup.
(-) frequently considered less secure then alternatives.
(-) not as flexible and not as good interoperable as IPSec.
(but works great as long as you deal with Windows/Linux machines)
There is a pretty good New Riders book: Building Linux VPNs. It walks
you through all these systems (and probably a couple more I forgot)
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