Perle Systems IOLINK-520 - Manual (Page 28)

Applications
2.8 — IOLINK-520 & IOLINK-PRO Installation & Applications Guide
2.1.2.3 - IP Default Gateway
An IP default gateway is an IP router that is resident on the local IP network that this
IOLINK router is connected to and is used to route IP frames for destination networks that
do not exist in the routing table. When an IP frame is received that is destined for a
network that is not listed in the routing table of the IOLINK router, the router will send the
IP frame to the default gateway. If the device originating the IP frame is on the same LAN
as the IOLINK router, the router will then send an ICMP redirect message to the
originating device. Any future IP frames for that destination network will then be sent
directly to the default gateway instead of the IOLINK router.
A default gateway may be configured if there are a large number of routes that will pass
through another router to a larger network. An example of this would be a router that is
used to connect to the Internet. All of the routers on the LAN would have the Internet
access router as the default gateway.
2.1.2.4 - IP Static Route
With its default settings, the IOLINK-520 & IOLINK-PRO will automatically learn the
routes to other devices on the network through RIP messages. In some instances it may be
desirable to have a predetermined or static route that will always be used to reach certain
devices, such as when one specific router is to be used to reach a destination IP network.
The static route will have precedence over all learned RIP routes even if the cost of the RIP
learned routes is lower.
Edit Static Route
Location: Main
!
Configuration
!
Packet Services Set-up
!
IP Routing Set-up
!
IP Routes
!
Edit Route
!
Destination ( IP Address & Mask)
!
Next Hop (Remote site ID or
IP Address & Mask)
!
Cost
!
Add
Each static IP route is defined in the Edit Route menu. The destination
network IP address is specified when you first enter the menu and then the
IP address , alias or ID number of the next hop route and the cost may be
defined. Finally, select Add to add the route to the routing table.
Once static IP routes are defined, they may be viewed with the Show Static Routes
command from the IP Routes menu.
Configuration: When the IP routing protocol is set to none, static routes will be used to route
Note traffic. The mask size must also be defined when creating a static
route entry. The subnet mask is required to allow a static route to be created
to a different IP network address. See the previous section for an explanation
of masks.
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