topic Re: Ping to localhost failed in Operating System - HP-UX

Ping to localhost failed

Hari Pantja — Tue, 28 Oct 2003 02:08:43 GMT

Dear all,

I can't ping from my server to it's localhost.
I've checked to files /etc/hosts and /etc/rc.config.d/netconf and the entry localhost already in there.

Pls help me to resolve this problem.

thanks,

Hari

Re: Ping to localhost failed

Elmar P. Kolkman — Tue, 28 Oct 2003 02:15:06 GMT

For this we need more info.
Could you check your route table (netstat -rn)?
And try 'ping 127.0.0.1' to make sure that the problem is not DNS/NIS related.
Also make sure there is no firewall software installed dropping icmp packats on all interfaces, including your loopback interface.

If you can't solve it with this info, send us the output of netstat -rn, your localhost entry from /etc/host and the ifconfig output for lo0 and other interfaces.

Re: Ping to localhost failed

aparna challagulla — Tue, 28 Oct 2003 02:30:36 GMT

hi Hari,
check /etc/nsswitch.conf file also.
it should have an entry for hosts.
HTH
aparna

Re: Ping to localhost failed

John Waller — Tue, 28 Oct 2003 02:35:31 GMT

Hi
You mention that you have looked in netconf and the entry localhost is in there, is this under the entry LOOPBACK_ADDRESS. Also does a "netstat -i" command show something like
lo0 4136 127.0.0.0 localhost 16057352 16057353

Re: Ping to localhost failed

Hari Pantja — Tue, 28 Oct 2003 02:37:22 GMT

Thanks Elmar & Aparma,

The problem has been solved by shutting down lo0 and the start again lo0 by ifconfig command. But the problem occurs again and again.

what should i do ? what can cause this problem ?
thanks

Hari

Re: Ping to localhost failed

Elmar P. Kolkman — Tue, 28 Oct 2003 02:43:05 GMT

I have seen this before, but not on a loopback device... It happened to me on a route that was removed after some time because the gateway was not pingable. Could it be that you have some extra routes that are (accidentially) going through your loopback device ?

I don't know by head, but there is a ndd parameter to disable the checking of gateways HP-ux 11 does by default. A way for someone else to score some extra points...

Re: Ping to localhost failed

RAC_1 — Tue, 28 Oct 2003 02:49:42 GMT

That ndd para. is ip_ire_gw_probe.
Should be disabled.

But that should have any effet on loopback.

Re: Ping to localhost failed

Hari Pantja — Tue, 28 Oct 2003 02:51:47 GMT

I give you output from netstat -i

BR,

Hari

Re: Ping to localhost failed

Animesh Chakraborty — Tue, 28 Oct 2003 03:15:10 GMT

Hi Hari,
We had remove PHNE_28895 and installed PHNE_28089 patch when we faced this similar problem.
This is for hpux11i.

Hope this helps.

Thanks
Animesh

Re: Ping to localhost failed

Norman_21 — Tue, 28 Oct 2003 04:25:54 GMT

Hello,

Edit the /etc/auth/system/devassign file and add the following entry for the lo0 loopback interface:

lo0:v_type=nic:v_cursl=WILDCARD:chkent:
Save the changes to the /etc/auth/system/devassign file.

# ifconfig lo0 up

look at the HP TKB# PAJ970708001

Hope this help
Thanks