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Threshold This setting affects the number of “half-open”
connections allowed.
❏ A “half-open” connection arises when a remote
client contacts the Server with a connection
request, but then does not reply to the Server's
response.
❏ While the optimum number of “half-open”
connections allowed (the “Threshold”)
depends on many factors, the most important
factor is the available bandwidth of your
Internet connection.
❏ Select the setting to match the bandwidth of
your Internet connection.
Options
Respond to ICMP The ICMP protocol is used by the “ping” and
“traceroute” programs, and by network
monitoring and diagnostic programs.
❏ If checked, the Wireless Router will respond to
ICMP packets received from the Internet.
❏ If not checked, ICMP packets from the Internet
will be ignored. Disabling this option provides
a slight increase in security.
Allow IPsec The IPSec protocol is used to establish a secure
connection, and is widely used by VPN (Virtual
Private Networking) programs.
❏ If checked, IPSec connections are allowed.
❏ If not checked, IPSec connections are blocked.
Allow PPTP PPTP (Point to Point Tunneling Protocol) is widely
used by VPN (Virtual Private Networking)
programs.
❏ If checked, PPTP connections are allowed
❏ If not checked, PPTP connections are blocked.
Allow L2TP L2TP is a protocol developed by Cisco for VPNs
(Virtual Private Networks).
❏ If checked, L2TP connections are allowed.
❏ If not checked, L2TP connections are blocked.