System information

Troubleshooting ISO CLNS 12-275
ISO CLNS: Host Cannot Access Hosts on Local or Remote Network
Table 12-3 outlines the problems that might cause this symptom and describes solutions to those
problems.
Table 12-3 ISO CLNS: Host Cannot Access Hosts on Local or Remote Network
Possible Problem Solution
Missing or mis-
configured default
gateway specification
Step 1 Determine whether a default gateway is specified in the adjacency table of the host
attempting to make a connection. Use the following UNIX command:
host% netstat -rn
Check the output of this command for a default gateway specification.
Syntax Description:
• netstat—Displays protocol statistics and current TCP/IP
1
network connections
• r—Displays the contents of the routing table
• n—Displays addresses and port numbers in numeric form
Step 2 If the default gateway specification is incorrect, or if it is not present at all, you can
change or add a default gateway using the following UNIX command at the local
host:
host% route add default address 1
where address is the IP address of the default gateway (the router local to the host).
The value 1 indicates that the specified gateway is one hop away.
Step 3 It is recommended that you specify a default gateway as part of the boot process.
Specify the ISO CLNS address of the gateway in the following UNIX host file:
/etc/defaultrouter
This filename might be different on your UNIX system.
End system has no
Level 1 router
Step 1 Use the show clns neighbors detail privileged exec command to show all ESs
2
and ISs
3
to which the router is directly connected.
Step 2 Make sure there is at least one Level 1 router on the same network as the end
system.
Level 1 router or ES
has bad address
Step 1 Verify that the Level 1 router has the same address as the ES.
Step 2 Verify that all bytes of the NSAP
4
address, up to but not including the system ID,
are the same on both the router and the ES. The domain and area addresses must
match, and the station IDs must be unique. (The value of the n-selector byte has no
impact in this case.)