HP-UX LAN Administrator's Guide (Feburary 2007)

Troubleshooting HP-UX LANDRAFT COPY
Diagnostic Flowcharts
Chapter 582
Flowchart 11 Procedures
A. Host Portion all 0's or all 1's? Execute ifconfig. 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 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 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.
K. Correct subnet mask. To do so, execute ifconfig with the proper subnet
mask. Go to D.