topic Re: Hostname/ IP address in Operating System - HP-UX

Hostname/ IP address

Roro_2 — Fri, 17 Dec 2010 06:18:35 GMT

Hello,

Our customer has an HPUX server ( BL860c ) running Oracle database under HPUX 11i V3.
They are facing the following problem :
unable to access the server through hostname from application and from telnet sessions.
No problem when using IP address.

Please advise .
Thanks and Regards

Roger

Re: Hostname/ IP address

kemo — Fri, 17 Dec 2010 06:29:41 GMT

check your DNS server. otherwise , for each computer put entry to resolve the DB server IP address.

for windows machines:
WIN_DRIVE:\Windows\System32\drivers\etc\hosts

for UNIX and LINUX clients:

/etc/hosts

thanks

Re: Hostname/ IP address

Johnson Punniyalingam — Fri, 17 Dec 2010 06:38:27 GMT

>>> Our customer has an HPUX server ( BL860c ) running Oracle database under HPUX 11i V3.

can you check entry on below file

more /etc/nsswitch.conf

hosts: files [NOTFOUND=continue] dns

Re: Hostname/ IP address

Roro_2 — Fri, 17 Dec 2010 06:39:04 GMT

Hello ,
Thanks for your concern.

The file /etc/hosts include all hostnames and IP addresses normally and the server is functionning since many months correctly.
Now rhe customer has infomed me that the problem wad fixed after rebooting HPUX , but they want to know what was the problem with the server to avoid any future similar case.

Roger

Re: Hostname/ IP address

Ismail Azad — Fri, 17 Dec 2010 07:17:10 GMT

Hi,

Looks like it has to be a hostname resolution problem. Without knowing what mechanism you are using it is difficult to say but it MIGHT be that the administrator has performed a hostname resolution mechanism change.

However, I would like to say this again that whenever a configuration change is made, starting that particular service might not serve the purpose as those services would have dependencies and the cleanest way of starting the services in a sequential fashion is to give a reboot if allowed which has solved your problem.

Regards
Ismail Azad

Re: Hostname/ IP address

Roro_2 — Fri, 17 Dec 2010 07:29:48 GMT

Hi,

Please i want to know what are the factors in the HPUX server which could affect the hostname resolving mechanism
( processes, ....) because the problem was fixed after the reboot.

Thanks and Regards

Roger

Re: Hostname/ IP address

Johnson Punniyalingam — Fri, 17 Dec 2010 08:12:09 GMT

>>> host name resolving mechanism

if you are referring to host name resolving mechanism,

possibilities :- "Which I can think off"

DNS Server failure

routing table (i mean if some one have removed default gateway)

inetd process down or died

hosts: files [NOTFOUND=continue] dns

Above entries should be added to continued host name resolution can be carried by /etc/hosts even though (DNS Server fails)
under file /etc/nsswitch.conf

Re: Hostname/ IP address

Johnson Punniyalingam — Fri, 17 Dec 2010 08:15:02 GMT

Finally.. if some one plays around your(system configuration files) this problem / consider to be user problem

example :- changing hostname