Lancom Systems LCOS 3.50 7.2 IP routing

LANCOM Reference Manual LCOS 3.50  Chapter 7: Routing and WAN connections

Routing and WAN

connections

햵Transmission of data packets

As soon as the connection is established, the router can send the data

packet to the Internet.

7.2 IP routing

An IP router works between networks which use TCP/IP as the network proto-

col. This only allows data transmissions to destination addresses entered in

the routing table. This section explains the structure of the IP routing table of

an LANCOM router, as well as the additional functions available to support IP

routing.

The IP routing table is used to tell the router which remote station (which

other router or computer) it should send the data for particular IP addresses

or IP address ranges to. This type of entry is also known as a “route“ since it

is used to describe the path of the data packet. This procedure is also called

“static routing” since you make these entries yourself and they remain

unchanged until you either change or delete them yourself. Naturally,

“dynamic routing” also exists. The routers use the routes in this way to

exchange data between themselves and continually update it automatically.

The static routing table can hold up to 256 entries, the dynamic table can hold

128. The IP router looks at both tables when the IP RIP is activated.

You also use the IP routing table to tell the router the length of this route's

path so that it can select the most suitable route in conjunction with IP RIP

where there are several routes to the same destination. The default setting for

the distance to another router is 2, i.e. the router can be reache d directly. All

devices which can be reached locally, such as other routers in the same LAN

or workstation computers connected via proxy ARP are entered with the dis-

tance 0. The “qual ity leve l” of thi s route wi ll be red uced if t he entry a ddresse d

has a higher distance (up to 14). “Unfavourable” routes like this will only be

used if no other route to the remote station in question can be found.