Eicon Networks DIVA LAN ISDN - Manual (Page 123)

Chapter Nine: Advanced Installations IP routes 123
Why routes are needed
Data on an IP network is carried in small packages called datagrams. Each datagram contains the IP address of
its source and destination. In order to send datagrams to their proper destination, the DIVA LAN ISDN Modem
requires a list of destinations and the addresses that are associated with it. This information is stored in a route.
Since more than one route is generally required, they are grouped together in a routing table. Each time the
DIVA LAN ISDN Modem sends or received a datagram, it consults the routing table to determine the target
destination for the datagram.
Single connection
Consider the following scenario:
Since there is only one destination for outgoing data (the Internet), only one route is required. This route needs
to match all addresses. The special address 0.0.0.0 does this. The same would be true for a Corporate
connection. If you want to route all data to the corporate network, specify a single route using the special
address 0.0.0.0.
There can be only one default route on the DIVA LAN ISDN Modem. The default route always uses the special
address 0.0.0.0.
DIVA LAN ISDN Modem
Internet
ISP
FAULT POWER
DIVA LAN ISDN Modem
ISDN E4/C E1 E2 E3 LINK Ethernet B1 B2 D
192.168.1.1
192.168.1.5 192.168.1.4 192.168.1.3 192.168.1.2
Routes
Route 1 = 0.0.0.0 with a mask of 0. Assigned to Internet connection.
Network
ISDN
B-channel
212.182.22.39
Address negotiated with ISP
ISP profile