Telnet Login delay

[Eric Jacklin]

we are using HP UX 11.11 for one of our RP7400 server.here from last couple of days we are facing a issue of telnet delay.

In which if i will do the telnet to my server but the username/password screen comes very late i have checked the Local Lan configration but it seems ok.

i have checked it from the server side my LAN is working fine even there is no error in syslog for LAN card so now what should i checked.

[James R. Ferguson]

Hi:

Verify your DNS. The delay may be a reverse-name lookup issue.

Regards!

...JRF...

[Tim Nelson]

99.999999% of the time it is a DNS issue. Server is attempting to reverse lookup the IP address for the client in order to make a log entry.

Test your DNS, is it working, nslookup abc.mycompany.com, nslookup 172.20.33.101.

Check /etc/resolv.conf and or post if needed.

[TTr]

These are caused by reverse name lookups on your server. One solution is to put all your telnet client machines in the DNS. However in some cases that is not always possible such as with PCs and dynamic IPs etc. In that case you can lower the timeout value of the reverse lookup on your rp7400 server by editing the /etc/resolve.conf fie nd adding the lines

retrans 2000
retry 1

This means that there is a 2 second time out for a reverse lookup resolution and one retry. So this will make your telnet delay 4 seconds for unresolved clients.