Configuring network interfaces Configure Ethernet interfaces
Digi TransPort® Routers User Guide
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n When set to No restrictions, users on this interface can access the router’s Telnet, FTP,
and web services for the purpose of managing the router.
n When set to Disable management, users on this interface are prevented from
managing the router via Telnet, FTP, or the web interface.
n For Disable return RST, whenever a router receives a TCP SYN packet for one of its
own IP addresses with the destination port set to an unexpected value, such as a port
that the router would normally expect to receive TCP traffic on, it will reply with a TCP
RST packet. This is normal behavior. However, the nature of internet traffic is such that
whenever an internet connection is established, TCYP SYN packets are to be expected.
As the router’s PPP inactivity timer is restarted each time the router transmits data
(but not when it receives data), the standard response of the router to SYN packets
such as transmitting an RST packet, will restart the inactivity timer and prevent the
router from disconnecting the link even when there is no genuine traffic. This effect can
be prevented by using the appropriate commands and options within the firewall script.
However, on Digi 1000 series routers, or where you are not using a firewall, the same
result can be achieved by selecting this option, such as when this option is selected the
normal behavior of the router in responding to SYN packets with RST packets is
disabled. The option will also prevent the router from responding to unsolicited UDP
packets with the normal ICMP destination unreachable responses.
n The Disable management & return RST option prevents users from managing the
router via the Telnet, FTP, and web interfaces and also disables the transmission of TCP
RST packets as above.
Multihome additional consecutive addresses
Defines how many additional (consecutive) addresses the Ethernet driver will own. For
example, if the IP address of the interface is 10.3.20.40, and Multihome additional
consecutive addresses is set to 3, the IP addresses 10.3.20.41, 10.3.20.42, and 10.3.20.43
also belong to the Ethernet interface.
Enable IGMP on this interface
Enables or disables the Internet Group Management Protocol for this Ethernet interface.
Enable Bridge on this interface
Bridge mode only applies to models with built-in Wi-Fi. If Wi-Fi is enabled, you must enable
bridge mode on Eth 0. This creates an Ethernet bridge between the Wi-Fi access point and the
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