User guide

Chapter 6 – RouteFinder Software
Multi-Tech Systems, Inc. RouteFinder RF850/860 User Guide (PN S000400E) 87
Network Setup > Interface
Secondary DNS Address: Enter the Secondary DNS Address, the address of the secondary
DNS server to be used by the local peer through the specific
interface. Then click Save. This field can be left blank. Note that a
secondary DNS server cannot be configured without a primary.
Proxy ARP on Interface: Check this box to enable Proxy ARP on the interface. A router using
Proxy ARP recognizes ARP requests for hosts on the other side of
the router that cannot reply themselves. The router answers for those
addresses with an ARP reply matching the remote IP address with
the router's Ethernet address. This is typically used in scenarios
where the other side is a subnet of a larger network.
Note: All packet filtering rules still apply when Proxy ARP is enabled.
This is not a full bridging function!
If the Proxy ARP on this Interface is activated, the RouteFinder will
relay the ARP protocol on this network card for all the networks
known to it.
This function is necessary in some special cases; e.g., when the
correct routes for a network cannot be set and the network has to be
passed on through the firewall. This can be the case if you have no
access to the router of your Internet provider.
A Possible Error: The Interface menu doesn’t contain entry fields for
all the network cards.
Possible Cause of Error: The missing network card was added after
the installation of the RouteFinder or it wasn’t recognized during
installation.
Solution: Reinstall the RouteFinder software. You can use the
backup feature (described earlier in this chapter) to transfer your
configuration between the installations.
NIC Type, MAC Address, IRQ, IO Port Info: This information defaults into the corresponding fields.
NIC Advanced Configurations: In this section you can configure the Speed and Duplexity of
the NICs. By default, the RouteFinder automatically detects the Speed and
Duplexity of the NICs. If you want to change these values, click on the word
Change and then select the new speed (10Mb/s or 100Mb/s) and the new
Duplexity ((Full or Half). The changes can be ignored by clicking Reset in which
case the RouteFinder will detect these values automatically.
IP Aliases: Multiple IP Addresses can be assigned to a network interface using IP Aliases.
These IP Addresses are considered equivalent to the primary address of the
network interface.
Note: The same IP address cannot be configured many times for an interface.
Similarly, the same IP address cannot be entered as an IP Alias address for two
different interfaces.
Network Cards
About Network Card 1 (LAN eth0) – This is the internal network (LAN). The parameters were
entered during initial installation. They can be changed.
About Network Card 2 (WAN eth1) – Network Card 2 is the interface to the external network
(Internet). This network card (eth1)
About Network Card 3 (DMZ eth2) – This network card (eth2) is the interface to the optional DMZ
network. A DMZ (De-militarized Zone) is a special LAN on the public network side of a firewall to
allow a single WAN router to support both private (VPN) and public access to resources. Using a
DMZ allows one IP Address (computer) to be exposed to the Internet. Some applications require
multiple TCP/IP ports to be open. A DMZ allows just one computer to be exposed for that purpose. It
is recommended that you set your computer with a static IP to use DMZ.
Effect of Changes – When you make a change that affects other administration functions and
configurations, an informational screen displays that tells you the network interface you have just
changed is used in several other configurations, and then the configurations affected by this change
are listed for you. If the automatic changes are acceptable, continue editing. If the automatic changes
are not
acceptable, click your browser‘s Back button and continue.