topic Re: cannot ping localhost after reset kernel parameters in Operating System - HP-UX

cannot ping localhost after reset kernel parameters

Teck Sim — Tue, 16 Jul 2002 13:47:32 GMT

I was able to ping localhost, to other servers. But after I reset kernel parameters, I was unable to ping.
System is HP-UX 11.

Thanks.

Re: cannot ping localhost after reset kernel parameters

Arockia Jegan — Tue, 16 Jul 2002 13:54:37 GMT

Can you have look at /etc/rc.log file for error messages for network startup scripts? Try to run /sbin/init.d/net start manually. If you get any error messages please post that messages. Run ifconfig to make sure it's showing the interface is up.

Re: cannot ping localhost after reset kernel parameters

MANOJ SRIVASTAVA — Tue, 16 Jul 2002 13:58:11 GMT

Hi Teck

Do a nslookup local hostanem and see how it ersolves its name , if it using the DNS server than there may be an issue , the best way to check this is to rename /etc/resolv.con to some other file and use the /etc/hosts to resolve the name . The check is do a nslookup hostname and once the name is reolved properly thatn may be you can ping to other servers too.

Also what is o/p of netstat -nr is it pointing to the coreect gateway ie deafualt gateway.

Manoj Srivastava

Re: cannot ping localhost after reset kernel parameters

PIYUSH D. PATEL — Tue, 16 Jul 2002 14:01:19 GMT

Hi,

Check for various things :

1. /etc/resolv.conf
2. /etc/nsswitch.conf
3. /etc/hosts
4. #ifconfig lan0 ( check whether lan card is up or not )
5. linkloop macaddress ( of the lan card)
6. lanscan
7. make sure that your /etc/hosts contains the following line:
127.0.0.1 localhost loopback

Piyush

Re: cannot ping localhost after reset kernel parameters

S.K. Chan — Tue, 16 Jul 2002 14:01:48 GMT

What are the kernel parameters you changed/reset ? Did you check you LAN interface to make sure it's ok (lanscan and lanadmin) ? Is the box able to ping to itself, ping others with IP address ?

Re: cannot ping localhost after reset kernel parameters

PIYUSH D. PATEL — Tue, 16 Jul 2002 14:04:46 GMT

Hi,

Check your /etc/resolv.conf (if you are using DNS) and /etc/nsswitch.conf.

If you are only using the /etc/hosts file, check that your nsswitch.conf has

hosts: files [NOTFOUND=continue]

Piyush

Re: cannot ping localhost after reset kernel parameters

Teck Sim — Tue, 16 Jul 2002 14:26:12 GMT

I reset the new kernel parameters to the old values after I did cold-install on HP-UX 11, and reboot the system.

Before changing the new kernel parameters back to the old ones, everything worked fine. I could ping, did nslookup, ping from one server to another server, back and forth, no problem.

Re: cannot ping localhost after reset kernel parameters

Sanjay_6 — Tue, 16 Jul 2002 14:34:25 GMT

Hi,

Did your lan network came up. What were the parameters you modified. Check and see the /etc/rc.log file if the network came up.

Hope this helps.

Regds

Re: cannot ping localhost after reset kernel parameters

Teck Sim — Tue, 16 Jul 2002 15:43:01 GMT

Error message from /etc/rc.log file:

Start Software Distributor agent daemon
Output from "/sbin/rc2.d/s870 swagentd start:
______________________________________________

Error: swagentd exiting due to initialization error in background process. Check the logfile "/var/adm/sw/swagentd.log" for more information.

I ran /sbin/init.d/net start and it did not return any error messages.

Thanks.

Re: cannot ping localhost after reset kernel parameters

PIYUSH D. PATEL — Tue, 16 Jul 2002 15:45:59 GMT

Hi,

What kernel parameters did you change ???

What was the earlier version of OS on the system ??

Piyush

Re: cannot ping localhost after reset kernel parameters

Teck Sim — Tue, 16 Jul 2002 15:50:51 GMT

maxuprc=597,
msgmap=6642,
msgmax=32768,
msgmnb=65535,
ncallout=680,
semmap=3322,
semmni=3320,
semmns=6640,
semmnu=660

Re: cannot ping localhost after reset kernel parameters

Teck Sim — Tue, 16 Jul 2002 15:55:46 GMT

Earlier version was HP-UX 10.20

Re: cannot ping localhost after reset kernel parameters

PIYUSH D. PATEL — Tue, 16 Jul 2002 15:59:35 GMT

Hi,

You shouldnt change the paramters of 10.20 for 11 OS. You should revert back with the old parameters of HPUX 11 OS.

You can even boot with the old kernel....since it might have got saved in the /stand directory with vmunix.prev. The current kernel will be vmunix.

Boot with the old kernel and if everything is owrking fine then you could use the old kernel only.

Piyush

Re: cannot ping localhost after reset kernel parameters

Teck Sim — Tue, 16 Jul 2002 16:33:09 GMT

How can I unlock the keyboard?

On the left hand side bottom of the monitor,
"KB LOCKD" appears. How can I get rid of this this?
Thanks.

Re: cannot ping localhost after reset kernel parameters

PIYUSH D. PATEL — Tue, 16 Jul 2002 16:45:38 GMT

Hi,

For the console problem, try:

1) Ctrl+shift+reset
2) Powercycle the console
3) Ctrl+D or Ctrl+C
4) Press the F4 key.

Piyush

Re: cannot ping localhost after reset kernel parameters

Arockia Jegan — Tue, 16 Jul 2002 16:47:31 GMT

Can you post the content of netconf file? What did you get when you run /sbin/init.d/net start? Can you run "ifconfig lan0 up"?

Re: cannot ping localhost after reset kernel parameters

Teck Sim — Wed, 17 Jul 2002 11:13:21 GMT

Somehow NIS do not work well after re-setting the kernel parameters.
I went to /etc/rc.config.d/, and changed NIS_CLIENT="0" from 1 in namesvrs.
Now I am able to ping from localhost, and from other servers.

Thanks for all the helps.