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Chapter 5. TCP/IP Settings 41
troubleshooting – it can allow a technician to
remotely check the AP+4 configuration
settings.
In normal use, this option should be disabled
for security reasons.
Enable IPsec
passthrough on
VPN connection
(PPTP/VPN only) Select this check box to let
network devices communicate via a
V
irtual
P
rivate
N
etwork (VPN) using
I
nternet
P
rotocol
sec
urity (IPsec), in which sending and
receiving devices share a so-called public key
for encryption and decryption. The AP+4
simply passes the encrypted packets back and
forth between the VPN clients and the ISP’s
VPN server.
Enable PPTP
passthrough on
VPN connection
(PPTP/VPN only) Select this check box to
protect VPN communication via
P
oint-to-
P
oint
T
unneling
P
rotocol. The AP+4 passes the
encrypted packets back and forth between the
VPN clients and the ISP’s VPN server.
Enable L2TP
passthrough on
VPN connection
(PPTP/VPN only) Select this check box to
protect VPN communication via
L
ayer
2
T
unneling
P
rotocol
,
an enhancement of PPTP
and L2F protocols. The AP+4 passes the
encrypted packets back and forth between the
VPN clients and the ISP’s VPN server.