Telnet very slow for some users

[Tony Flaherty]

I have a L5430 hpux11.11;
users connect via telnet
most users connect with no problems, however some users have very slow refreshes of screens with regular programs hanging for 10's of seconds. The users are running a variety of Windows versions, but I can see no commonality between the affected users.

The really wierd thing is they all work OK on an old K200 hpux 10.20 and if they telnet to the K200 and then from there to the L5430 they do not see any performance problems!!! I've tried a traceroute from a PC - fine, ping times are fine too.

I think it might be an incompatibility between telnet implementations, any one have any ideas?

Tony

[Sridhar Bhaskarla]

Hi Tony,

One thing that flashed immediately was about the DNS configuration on the L5430 box. Check to see if it is setup the same way as the K200.

-Sri

[John Poff]

Hi Tony,

I've seen a similar problem before. The box we were telnet'ing to had the name resolution messed up. I could telnet quickly to the box because I had the hostname/IP address defined on my local box. Other people tried to connect with the hostname resolved through DNS, and the mismatch between DNS and the host caused it to be slow.

JP

[steven Burgess_2]

Hi Tony

I would also look to see how the dns resolution is set

look at your /etc/nsswitch.conf file and resolve locally first

hosts: file [NOTFOUND=continue] dns

HTH

Steve

[Sean OB_1]

Tony,

This sounds like a DNS issue.

Check forward AND reverse lookups on the new box.

Make sure that you can resolve the client IP's to names, and vice versa.

HTH,

Sean

[Tony Flaherty]

Thanks for the replies guys!

I will investigate DNS. However, I seem to get the same problems even if I add the machine to the hosts files of the PCs, and lots of users who don't have the machine in their hosts files are working fine :-/

In the one case the problem has been resolved by changing the configuration of the NIC in the PC from full to half duplex, don't know why this wouldn't cause a problem with the K200 tho'

Thanks again for the replies, I've only been a member of these forums for a week and they're already indispensible!

Tony.

[Chris Wilshaw · Accepted solution]

Tony,

This could be a new feature of HP-UX 11.*

change the telnetd line in /etc/inetd.conf to

telnet stream tcp nowait root /usr/lbin/telnetd telnetd -TCP_DELAY


restart inetd using

inetd -c

You should then see some improvement.

Chris

[Tony Flaherty]

Ok, I've spoken to our network administrator, we don't use DNS for internal machines, we're using WINS.

I will try the TCP_DELAY and report back on my findings.

[Tony Flaherty]

the -TCP_DELAY appears to have resolved this for us.

Thanks guys.

Tony.