HP-UX IP Address and Client Management Administrator's Guide HP-UX 11i v2, HP-UX 11i v3

This asks for the NS records for the root. If no records for root servers are present, it
returns Can't find ".": Server failed.
• ping hostname
Names in the local domain are found, while names in remote domains are not found.
— Name server debugging output
Set debugging to level 1. Use ping on a host name not in the local domain. The
debugging output in /var/tmp/named.run contains the following: No root
name servers for class 1. (Class 1 is the IN class.)
— Dumping the name server database
No root server data appears in the “Hints” section at the end of the file
/var/tmp/named_dump.db.
4. Syntax errors in /etc/resolv.conf (for remote server configuration only). This assumes
that the server on the remote host is configured properly. Errors in /etc/resolv.conf
are silently ignored by the resolver code.
• ping IP_address or ping hostname
Only names in the NIS database or /etc/hosts file can be looked up. ping the remote
server’s address to verify connectivity.
• Name server debugging output
Turn on debugging on the remote server. Verify that it is receiving queries from the
local host. If queries are not being received, examine the name server entries in
/etc/resolv.conf and verify network connectivity to the remote server.
5. Network connectivity problems may cause certain lookups to fail. See the Installing and
Administering LAN/9000 Software manual for information on troubleshooting network
connectivity.
• Name server debugging output
Turn on debug level 1. Use ping on the host name. Examine the name server debugging
output in /var/tmp/named.run for lines like this:
req: found `cucard.med.columbia.edu’ as `columbia.edu’
resend(addr=1 n=0) -> 128.59.32.1 6 (53) nsid=18 id=1 0ms
resend(addr=2 n=0) -> 128.59.40.130 6 (53) nsid=18 id=1 0ms
resend(addr=3 n=0) -> 128.103.1.1 6 (53) nsid=18 id=1 764ms
In this case the name server tries to contact the columbia.edu name servers but does
not get a response. Use ping on the addresses the server is trying to contact to verify
network connectivity.
If the addresses being tried are the root name servers, either the host does not have
connectivity to these machines, or the root server addresses are wrong.
• nslookup
nslookup times out while trying to look up the name.
• ping hostname
A message is returned saying that the host is unknown.
Troubleshooting the BIND Name Server 93