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DMZ IP Address
Specify the LAN IP address of the LAN computer that you want to have
unrestricted Internet communication. If this computer obtains its address
Automatically using DHCP, then you may want to make a static reservation on
the
Basic → Network Settings
does not change.
Non-UDP/TCP/ICMP LAN Sessions
When a LAN application that uses a protocol other than UDP, TCP, or ICMP initiates
a session to the Internet, the router's NAT can track such a session, even though it
does not recognize the protocol. This feature is useful because it enables certain
applications (most importantly a single VPN connection to a remote host) without the
need for an ALG.
Note that this feature does not apply to the DMZ host (if one is enabled). The DMZ
host always handles these kinds of sessions.
Enable
Enabling this option (the default setting) enables single VPN connections to a
remote host. (But, for multiple VPN connections, the appropriate VPN ALG must
be used.) Disabling this option, however, only disables VPN if the appropriate
VPN ALG is also disabled.
Application Level Gateway (ALG) Configuration
Here you can enable or disable ALGs. Some protocols and applications require
special handling of the IP payload to make them work with network address
translation (NAT). Each ALG provides special handling for a specific protocol or
application. A number of ALGs for common applications are enabled by default.
PPTP
Allows multiple machines on the LAN to connect to their corporate networks
using PPTP protocol. When the PPTP ALG is enabled, LAN computers can
establish PPTP VPN connections either with the same or with different VPN
servers. When the PPTP ALG is disabled, the router allows VPN operation in a
restricted way -- LAN computers are typically able to establish VPN tunnels to
different VPN Internet servers but not to the same server. The advantage of
disabling the PPTP ALG is to increase VPN performance. Enabling the PPTP
ALG also allows incoming VPN connections to a LAN side VPN server (refer to
Virtual
Server).
IPSec (VPN)
Allows multiple VPN clients to connect to their corporate networks using IPSec.
Some VPN clients support traversal of IPSec through NAT. This option may
interfere with the operation of such VPN clients. If you are having trouble
connecting with your corporate network, try disabling this option.
Check with the system administrator of your corporate network whether your
VPN client supports NAT traversal.
Note that L2TP VPN connections typically use IPSec to secure the connection.
page so that the IP address of the DMZ computer
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