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Manually Configuring your Modem
Manually Configuring your Modem
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Authentication
Required
None: No authentication.
Password: A password authentication key is
included in the packet. If this does not match
what is expected, the packet will be discarded.
This method provides very little security as it
is possible to learn the authentication key by
watching RIP packets.
MD5: An algorithm that is used to verify data
integrity through the creation of a 128-bitmessage
digest from data input (which may be a message
of any length) that is claimed to be as unique to
that specific data as a fingerprint is to a specific
individual.
Authentication
Code
Password or MD5 Authentication key.
RIP sends routing-update messages at regular intervals and when
the network topology changes. When a Modem receives a routing
update that includes changes to an entry, it updates its routing table
to reflect the new route. RIP Modems maintain only the best route to
a destination. After updating its routing table, the Modem immediately
begins transmitting routing updates to inform other network Modems
of the change.
Routing Table
Parameter Description
Flags Indicates the route status:
C = Direct connection on the same subnet.
S = Static Modem
R = RIP (Routing Information Protocol) assigned
route.
I = ICMP (Internet Control Message Protocol)
Redirect route.
Network
Address
Destination IP address
Netmask The subnetwork associated with the destination.
This is a template that identifies the address bits
in the destination address used for routing to
specific subnets. Each bit that corresponds to a
“1” is part of the subnet mask number; each bit
that corresponds to “0” is part of the host number.
Gateway The IP address of the Modem at the next hop to
which frames are forwarded.
Interface The local interface through which the next hop of
this route is reached.
Metric When a Modem receives a routing update that
contains a new or changed destination network
entry, the Modem adds 1 to the metric value
indicated in the update and enters the network in
the routing table.