Red Lion IndustrialPr 6000 Router - Manual (Page 52)

Software User Guide 52
Network Tab
Enter Remote Gateway: Enter the IP Address for the gateway device in the field provided. This field is only available
when Obtain Network Addresses via DHCP has been set to NO. This field is required if Use Remote Gateway as
Default Route is set to Yes.
A gateway is a device (typically a router) used to gain access to another network. For example, if a device is attached
to a LAN whose network address is 192.168.1.0 with a netmask of 255.255.255.0, then it can communicate directly
with any other device on that network with a range of addresses of 192.168.1.1 through 192.168.1.254 (with
192.168.1.255 reserved for broadcast). An address outside of that range is on a different network which would need
to accessed indirectly through a router and that router would be the gateway to the network on which the remote
target device resides, so to communicate with it would mean sending and receiving via the gateway device. This also
requires either defining a static route (defined through the Network→Sta c Routes screen) via that gateway or mak‐
ing it the default route (by setting Use Remote Gateway as Default Route to Yes.
Your Network Administrator should be able to provide an appropriate value. The address must be one within the valid
range for the network.
Enter Maximum Transmission Unit (MTU): Enter the desired MTU size. In computer networking, the maximum trans‐
mission unit (MTU) of a communications protocol of a layer is the size (in bytes) of the largest protocol data unit that
the layer can pass onwards. MTU parameters usually appear in association with a communications interface (NIC,
serial port, etc). Standards (Ethernet, for example) can fix the size of an MTU; or systems (such as point‐to‐point serial
links) may decide MTU at connect time. A larger MTU brings greater efficiency because each packet carries more user
data while protocol overheads, such as headers or underlying per‐packet delays, remain fixed; the resulting higher
efficiency means a slight improvements in bulk protocol throughput. A larger MTU also means processing of fewer
packets for the same amount of data. In some systems, per‐packet‐processing can be a critical performance limitation.
However, this gain is not without some downside. Large packets can occupy a slow link for some time, causing greater
delays to following packets and layer (and hence over most of the Internet), ties up a 14.4k modem for about one sec‐
ond. The recommended setting is 1500.
Interface Aliases: Sub‐interfacing is essentially the segmenting of a single wire, or port, into multiple IP networks. Instead
of subnetting and routing, you can create a sub‐interface and then set it up as you would a standard Ethernet interface.
To configure a sub‐interface:
• Click on the Add button and the following pop‐up window will appear: