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̈ Chapter 7: Routing and WAN connections LANCOM Reference Manual LCOS 3.50
69
Routing and WAN
connections
How can you assist the workstation computer now?
By default, the router sends the computer a response with the address of the
router which knows the route to the destination network (this response is
known as an ICMP redirect). The workstation computer then accepts this
address and sends the data packet straight to the other router.
Certain computers, however, do not know how to handle ICMP redirects. To
ensure that the data packets reach their destination anyway, use local routing.
In this way you instruct the router itself in your device to send the data packet
to other routers. In addition, in this case no more ICMP redirects will be sent.
The setting is made under:
Local routing can be very helpful in isolated cases, however, it should also only
be used in isolated cases. For local routing leads to a doubling of all data
packets to the desired target network. The data is first sent to the default
router and is then sent on from here to the router which is actually responsible
in the local network.
7.2.3 Dynamic routing with IP RIP
In addition to the static routing table, LANCOM routers also have a dynamic
routing table containing up to 128 entries. Unlike the static table, you do not
fill this out yourself, but leave it to be dealt with by the router itself. It uses the
Routing Information Protocol (RIP) for this purpose. All devices that support
RIP use this protocol to exchange information on the available routes.
What information is propagated by IP RIP?
A router uses the IP RIP information to inform the other routers in the network
of the routes it finds in its own static table. The following entries are ignored
in this process:
̈ Rejected routes with the '0.0.0.0' router setting.
̈ Routes referring to other routers in the local network.
̈ Routes linking individual computers to the LAN by proxy ARP.
Configuration tool Run
LANconfig IP router ̈ General ̈ Forward packets within the local network
WEBconfig Expert Configuration ̈ Setup ̈ IP-router-module ̈
Loc.-routing
Terminal/Telnet
set /setup/IP-router-module/Loc. routing on