ELSA Cable manual Description of the menu options R95, IP-address IP netmask Router-name Distance

Description of the menu options R95

IP-routing-tableThe routing table can contain a maximum of 128 entries of destination network addresses or direct IP addresses with netmasks, and the names or IP addresses of other local routers. Alternatively, you can enter a setting by means of which packets to specific destination IP addresses are discarded and are not answered by proxy ARP. This is done by entering 0.0.0.0 for the name of the responsible router.

The IP routing table is generally sorted as shown below:

KThe longest network mask is placed on top.

KFor network masks of equal length, the one with the smallest IP address is placed on top.

Address ranges that are prohibited in the Internet are excluded from transmission by preset entries in the IP routing table (the router name 0.0.0.0 means that packets to these addresses are not transmitted). The IP routing table below is provided by way of example and also shows the default settings:

IP-address	IP netmask	Router-name	Distance
192.168.0.0	255.255.0.0	0.0.0.0	0
172.16.0.0	255.240.0.0	0.0.0.0	0
10.0.0.0	255.0.0.0	0.0.0.0	0
255.255.255.255	0.0.0.0	Cable TV network	0

However, if these addresses are required for Intranet use, for example, it is possible to delete the predefined entries at any time. If the routing table contains no entries with the router name 0.0.0.0, the router processes all IP addresses with valid routes.

The last line is an entry for the “default route”. The IP address 255.255.255.255 means the same as 0.0.0.0 (for technical reasons, 0.0.0.0 cannot be entered in the first column). Because it contains the IP network mask 0.0.0.0, this line is always appropriate after the rest of the table has been searched. The router with the name 'Cable' stands for the cable network. The router thus sends everything that it cannot forward or transfer over other routes to the cable network operator's headend.

To route all data packets to a specific network, e.g. via an ISDN router in your LAN to another, enter the IP address of the other network and the netmask in the table and enter the local IP address of the router under 'Router'. The following assumes that your local network is using the IP addresses in the address range 10.1.0.0 (netmask 255.255.255.0). The ISDN router has the local IP address '10.1.0.99'; the other local network (that of your branch office) uses 10.2.0.0 (netmask 255.255.255.0). With the following entries, the cable modem will forward all data packets for the other network to the ISDN router and

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