topic Connectivity delay tim in Operating System - HP-UX

Connectivity delay tim

John Ferro — Tue, 21 Aug 2007 03:20:57 GMT

Dear All,

I have HP rp5479 hp ux v1, when i telnet i face delay time, i have to wait 7min and then i get login prompt. i confirmed with Data Network team, they said no any fault in network cause this delay..

What is the reason of delay?

Re: Connectivity delay tim

whiteknight — Tue, 21 Aug 2007 03:28:35 GMT

Faisal,

what about telnet by IP address ? Suspected the DNS is down ? Any changes lately like replace lan card or change switches ?

check nettl see if there is any duplicate ip

# netfmt -f nettl.LOG000 > /tmp/a.out
# more /tmp/a.out (check latest timestamp)

WK

Re: Connectivity delay tim

Ivan Krastev — Tue, 21 Aug 2007 04:04:25 GMT

Hi Faisal,

1. check name resolution, check DNS server(s).
2. check for presense of ipv6:
ls -l /dev/ip*

If you have it add this into /etc/nsswitch.conf:
ipnodes: files

regards,
ivan

Re: Connectivity delay tim

Steven E. Protter — Tue, 21 Aug 2007 04:06:40 GMT

Shalom,

Most common cause of this is:

1) Lack of an /etc/hosts entry on the target system for itself. Though DNS is supposed to resolve it, I've seen this time and time and again. If the target ip is 192.168.0.10 then add this to /etc/hosts

192.168.0.10 hostname

You may need a fully qualified domain name on the line as well as hostname depending on your network environment.

2) Slow DNS resolution. You might not like idea 1 in which case you should try again by ip address and if that is faster, deal with the DNS servers, which in many environments is a Microsoft problem.

SEP

Re: Connectivity delay tim

Bill Hassell — Tue, 21 Aug 2007 20:30:24 GMT

Simply use the IP address, NOT the hostname. Hostnames are poor substitutes for the IP address, primarily because someone has to maintain them. If no delay occurs with an IP address, then you have bad DNS problems. You can verify this with nslookup or nsquery. Change the /etc/nsswitch.conf to have the hosts: line read like this:

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

Now, put the hostnames you want to use in the /etc/hosts file. Do the same for the remote systems. That will end your connect delays. Then turn the DNS problems over to the DNS administrators.

Re: Connectivity delay tim

Asif Sharif — Wed, 22 Aug 2007 04:14:23 GMT

Hi Faisal,
see the below thread.

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=453887

Regards,
Asif Sharif