9.5;lcnet (list_connected_networks), revision 9.5, 87/01/20
LCNET (LIST_CONNECTED_NETWORKS) -- Display internet routing information.
usage: LCNET [-FULL] [-CONN] [-LOCAL] [-N node_spec] [-HW] [-C]
FORMAT
LCNET [options]
LCNET displays the list of known networks, their distances from the current
node, the router used as the first hop towards that network, and other
information.
The distances (hops) towards remote networks are measured in intervening
routers. The distances are all for one-way traffic; if a network is three hops
away from yours, your requests pass through three routers to get to that
network. The responses also pass through three routers on the way back.
The -CONN option shows you the full internet topology, i.e. the list of
networks and how the routers connect them together.
OPTIONS
Default options are indicated by "(D)."
-LOCAL (D) Display the 'First Hop' and 'Hops' information for each
network in the internet. The first hop is the node ID of a
router on your network. It is the first router used in
sending packets from your network to the target network.
Other routers are also used if the target network is more
than one hop away from your own.
-FULL Display information showing how up-to-date the routing
table is (the 'Age' and 'Expiration' columns) in addition
to the 'First hop' and 'Hops' information shown by the
-LOCAL option. -FULL also lists inaccessible networks.
-CONN Show which routers are connected to each network, and which
other networks those routers touch. This option displays
the 'Touching' information.
-HW Display the type of hardware used for each of the networks
(ring or IIC).
The -CONN and -HW options may take several seconds to
execute if you have a large internet.
-N node-spec Print another node's view of the internet. The outputs
produced by -LOCAL and -FULL vary from node to node; -N
affects these outputs. The -N option does not affect the
output produced by the -CONN or -HW options, since the
hardware and connectivity do not depend on a node's
position in the internet.
-C The -C option suppresses the title over each output column.
It also fills every line of the "Network" column produced
by the -CONN option, and every line of the "Hardware"
column produced by the -HW option. These format changes
make it easier to use LCNET's output as another program's
input.
EXAMPLES
In this example, the node is directly connected to network C0FFEE. Networks
5A1AD and ED1F1CE were connected in the past, but are not now accessible
(perhaps because the routers are down).
The expiration date and time for the 'local' network is meaningless.
$ lcnet -full
First
Network Hop Hops Age Expiration date/time
======== ===== ===== === ===================
B020 4B6F 1 NEW 1985/06/16 14:33:21
B00B00 4B6F 2 NEW 1985/06/16 14:33:21
5A1AD 4B6F gone NEW 1985/06/16 14:33:21
C0FFEE 0 local NEW 1985/06/09 10:27:46
ED1F1CE 4B6F gone NEW 1985/06/16 14:33:21
D0D0 BAD1 1 NEW 1985/06/16 14:33:39
The 'Touching' information describes your internet completely. This example
includes several kinds of information: - Network DEFACED has one router, node
2A3B. That router connects DEFACED to EFFACED. - Network FACE0FF contains
two routers, 31DC and 1371. Those routers connect FACE0FF to C0C0A and
C0FFEE, respectively.
$ lcnet -conn
Touching Touching
Network Router Network
======== ======== ========
F00D 5C0B DECAF
36CF C0FFEE
5A1AD 459B C0FFEE
45BE ED1F1CE
B002E 3F0A C0FFEE
C0C0A BAD1 B00B1E
56B0 EFFACED
31DC FACE0FF
DECAF 5C0B F00D
B00B1E BAD1 C0C0A
C0FFEE 36CF F00D
459B 5A1AD
3F0A B002E
1371 FACE0FF
DEFACED 2A3B EFFACED
ED1F1CE 45BE 5A1AD
EFFACED 56B0 C0C0A
2A3B DEFACED
FACE0FF 31DC C0C0A
1371 C0FFEE
$ lcnet -conn -c
F00D 5C0B DECAF
F00D 36CF C0FFEE
5A1AD 459B C0FFEE
5A1AD 45BE ED1F1CE
B002E 3F0A C0FFEE
C0C0A BAD1 B00B1E
C0C0A 56B0 EFFACED
C0C0A 31DC FACE0FF
DECAF 5C0B F00D
B00B1E BAD1 C0C0A
C0FFEE 36CF F00D
C0FFEE 459B 5A1AD
C0FFEE 3F0A B002E
C0FFEE 1371 FACE0FF
DEFACED 2A3B EFFACED
ED1F1CE 45BE 5A1AD
EFFACED 56B0 C0C0A
EFFACED 2A3B DEFACED
FACE0FF 31DC C0C0A
FACEOFF 1371 C0FFEE
RELATED TOPICS
More information is available. Type:
- HELP LCNODE
for information on listing connected nodes.