Ip Passthrough - Digi TransPort User Manual

IP Passthrough

IP passthrough is a useful feature if a host computer or server on the local area network needs to
have access to it from the Internet with a public IP address. With IP passthrough configured, all IP
traffic, not just TCP/UDP is forwarded back to the host computer. This feature can be useful for
applications that do not function reliably through network address translation.
In this configuration the local PC will share the public IP addressing information with the WAN
side of the router.
Enable IP Pass-through
When checked, this checkbox enables IP passthrough mode.
Ethernet interface
The value in this text box specifies the Ethernet interface that the local PC is connected to.
PPP interface
The value in this text box specifies the PPP interface that will share its WAN address with the
local PC.
Mode
This drop-down list selects the mode of operation for the passthrough functionality. The
available options are Normal/28 bit mask and Fixed IP Address/32 bit mask. The default is
Normal/28 bit mask. When Fixed IP/32 bit mask mode of operation is selected, the DHCP
server will provide a 32-bit subnet mask to the client and sets the address/subnet mask for the
Ethernet interface to 192.168.1.1/32.
Pinhole Configuration
The following parameters are checkboxes that allow specific protocols to be excluded from
the IP passthrough feature. An excluded protocol will terminate at the router instead of being
forwarded to the local PC.
HTTP
When checked, this checkbox excludes HTTP from passthrough.
HTTPS
When checked, this checkbox excludes HTTPS from passthrough.
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