Installing and Administering LAN/9000 Software

Chapter 4 109
Troubleshooting LAN/9000
Diagnostic Flowcharts
Flowchart 11 Procedures
A. Host Portion all 0's or all 1's? Execute ifconfig(1M).
Is the host portion of the IP address all 0's or all 1's?
These values are reserved. Refer to chapter 6 for
details on subnets. If the host portion of the IP address
is all 0's or all 1's, go to B to correct the IP address.
Otherwise, go to C to examine the subnetwork number.
B. Correct IP address. Correct the IP address and start
again with Flowchart 11.
D. Subnet mask set to what you expect? Check your
network map and execute ifconfig(1M) to determine
the subnet mask for your node. Refer to chapter 6 for
details on subnets. If the subnet mask is not what you
expect, go to I. Otherwise, go to E.
E. All hosts on subnet using same subnet mask? Execute
ifconfig(1M) for every network interface on each
node on the entire network. If all nodes are using the
same subnet mask, go to F. Otherwise, go to J to correct
the subnet masks.
F. All hosts on network have subnet mask set? Execute
ifconfig for every network interface on each node on
the entire network. If all nodes have the same subnet
mask set, go to G. Otherwise, go to K to set the correct
subnet masks.
G. Check route table on source, destination. Execute
netstat -rv on the two hosts. Go to H.
H. Correct the route tables (if necessary). In general,
specify a network, not a host when adding to the route
table. Specifying a network as the destination enables
you to add nodes to the remote destination subnetwork
without updating the route tables on the local
subnetwork every time you add a node to the remote
subnetwork.
I. Correct IP address. Set the subnet mask to the proper
value. Go to D.
J. Correct subnet mask. To do so, execute ifconfig with
the proper subnet mask. Go to D.