topic Re: Configuring DNS in Operating System - HP-UX

Configuring DNS

Elizabeth21 — Sun, 15 Jul 2007 13:12:02 GMT

I'm configuring DNS by file /etc/resolv.conf.
I have to add a new address DNS in my resolv, but then I done this the telnet connection is very slow to response.
Anyway, have I to do only that for add new DNS ??

thank you for each reply at my question !!

Re: Configuring DNS

Fabian Briseño — Sun, 15 Jul 2007 13:25:40 GMT

Hola Elizabeth.

in SAM->Networking and Communications->
Name Service Switch-> hosts

in what order is the name service awitch resolving ?

mine is /etc/hosts DNS NIS

also what Operating system version are you using?

Re: Configuring DNS

Steven E. Protter — Sun, 15 Jul 2007 14:23:32 GMT

Shalom,

You should also put an entry matching the ifconfig lan0 output for your system in /etc/hosts

The default configuration uses /etc/hosts first and your connection speed in inbound telnet can be boosted by this simple move. I'm assuming of course that lan0 is your primary NIC.

Good Luck,

SEP

Re: Configuring DNS

skt_skt — Sun, 15 Jul 2007 15:32:54 GMT

Could u give a sample output of /etc/resolv.conf and /etc/nsswitch.conf

How is the speed when u use ssh connection?

Re: Configuring DNS

Bill Hassell — Sun, 15 Jul 2007 21:08:38 GMT

> slow to respond

A classic case of missing DNS records. Your DNS administrator probably did not setup reverse (PTR) records for any of the hosts. HP-UX (and most Unix systems) try to authorize incoming connections by seeing if the IP address has been authorized by having an entry in DNS. When the DNS server has no PTR record, HP-UX waits for about 20-25 seconds per DNS server listed in resolv.conf.

The fix is to add all incoming hosts to /etc/hosts, then change the line in /etc/nsswitch.conf to read file then dns:

hosts: files [NOTFOUND=continue UNAVAIL=continue] dns

or fix your DNS server.

Re: Configuring DNS

Elizabeth21 — Mon, 23 Jul 2007 04:35:18 GMT

I try to configure the nsswitch.conf and add the ip in hosts file but the response by telnet is very slow yet.
Yes, the dns that I insert in resolv.conf is not yet available, but I need to configure it.

Re: Configuring DNS

Geoff Wild — Mon, 23 Jul 2007 08:24:12 GMT

Okay, which telnet connect it slow - from the server out? or to the server?

My resolv.conf:

domain mydomain.com
nameserver 192.168.110.147
nameserver 192.168.162.157
nameserver 192.168.162.6
retrans 1500
retry 2

Ttry adding the last 2 to yours (retrans and retry)

Rgds...Geoff

Re: Configuring DNS

Bill Hassell — Mon, 23 Jul 2007 12:07:19 GMT

You must rename /etc/resolv.conf because you do not have working DNS servers. Call it /etc/resolv.conf.old or something similar. Also change your /etc/nsswitch.conf to read:

hosts: files

and nothing else. Leave it this way until you have a working DNS server. Now you'll have no delays. Verify with:

nslookup some_name
nsquery hosts some_name

It should find everything in /etc/hosts.

Re: Configuring DNS

Elizabeth21 — Tue, 24 Jul 2007 06:41:32 GMT

thak you to all

I solve the slow connection by :
nsswitch.conf add UNAVAIL=continue
resolv.conf add retrans 1500 and retry 2

bye bye
Elis