AIX 5L Problem Determination - IBM Redbooks

A problem is when the system hangs while executing /etc/rc.net. The problem
can be caused by either a system or a network problem that happens because
TCP/IP waits for replies over an interface. If there are no replies, the wait
eventually times out and the system marks the interface as down. This time-out
period varies and can range from around three minutes to an indefinite period.
The following problem determination procedure is used to verify that the methods
and procedures run by /etc/rc.net are causing the LED 581 hang:
1. Boot the machine in service mode.
2. Move the /etc/rc.net file to a safe location:
mv /etc/rc.net /etc/rc.net.save
3. Reboot in normal mode to see if the system continues past the LED 581 and
allows you to log in.
Note: The previous steps assume that DNS or NIS is not configured.
If you determine that the procedures in /etc/rc.net are causing the hang, that is,
the system continued past LED 581 when you performed the steps above, the
problem may be one of the following:
► Ethernet or token-ring hardware problems
Run diagnostics and check the error log.
► Missing or incorrect default route
► Networks not accessible
Check that the gateways, name servers, and NIS masters are up and
available.
► Bad IP addresses or masks
Use the iptrace and ipreport commands for problem determination.
► Corrupt ODM
Remove and recreate network devices.
► Premature name or IP address resolution
Either named, ypbind/ypserv, or /etc/hosts may need correction.
► Extra spaces at the ends of lines in configuration files
Use the vi editor with the set list subcommand to check files, such as the
/etc/filesystems file, for this problem.
► LPP installations or configurations with errors
Reinstall the LPP.
Chapter 3. Booting problem determination 33