Configuring DNS

[Elizabeth21]

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 !!

[Fabian Briseño]

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?

[Steven E. Protter]

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

[skt_skt]

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

How is the speed when u use ssh connection?

[Bill Hassell]

> 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.

[Elizabeth21]

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.

[Geoff Wild · Accepted solution]

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

[Bill Hassell]

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.

[Elizabeth21]

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