Slow connection !

[Ivan Azuara]

Hi !

I have some problems in a HP9000/T50 HPUX 11.00.

The problem is .. when i'm connecting to the server , I observe a slow connection.

I made a lot of checksums to the tarjets, check the network, etc, but i haven??t found anything.

I have 3 network cards:

# netstat -ni
Name Mtu Network Address Ipkts Opkts
lan2 1500 130.10.0.0 130.10.16.8 35409083 117562847
lan1 1500 130.10.0.0 130.10.17.8 61550094 5216782
lan0 4352 190.50.0.0 190.50.10.8 83 83
lo0 4136 127.0.0.0 127.0.0.1 639936 639936

My users use only 2 network cards:

Name Mtu Network Address Ipkts Opkts
lan2 1500 130.10.0.0 130.10.16.8 35409083 117562847
lan1 1500 130.10.0.0 130.10.17.8 61550094 5216782

lan1 is a 10 base tarjet
lan2 is a 10/100 baseT

P.D. This server is connected a switch with 10/100 ports.

How can i found the problem to my slow connection ?


Best Regards !

[James R. Ferguson]

Hi Ivan:

"Slow connection" often implies a DNS reverse-name lookup problem. If you can connect quickly by IPAddress but not by hostname, this points to DNS. If so, make sure that your device's name is represented in the DNS tables of the DNS server. This should eliminate the (timeout) delay. Otherwise, place the IPAddresses you need in /etc/hosts and make sure that /etc/nsswitch.conf specifies a host lookup first.

Regards!

...JRF...

[U.SivaKumar_2]

hi,
what is the ping response ?.
if you suspect as DNS problem , use ip address
for connecting and observe whether problem persists.
regards,
U.SivaKumar

[Bill Hassell · Accepted solution]

You did not provide any indication of the nature of the connection problems. Is it a delay using telnet before you see a prompt? If yes, then the problem is with DNS--use nslookup to verify the delays. You'll need to create /etc/nsswitch.conf and put files, then dns for name resolution.

If telnet connections are fairly quick but ftp transfers are well below the typical speed of the LAN, you probably have a speed/duplex mismatch (very common at 100 mbits). Verify this with lanadmin. Change all 100 Mbit LAN cards to full duplex and also change the switch to which the cards are connected. Do not use auto-negotiation.

[Sridhar Bhaskarla]

Hi Ivan,

After checking your name server problems, you may need to verify the speed of your lancard lan2. Slow initial connection problems often correspond to hostname lookups. If you continue to see slowness even after the connection is established, they it may be the speed.

#lanadmin -x 2

Make sure that you are 100 Full duplex with auto-negotiation off if you are using a 100bt interface on the switch side. Set the interfaces on the switch and on the system side to 100FD AUTO-OFF. You can use the command lanadmin -X 100FD 2 to set it on the system.

And finally make sure you have latest good ARPA transport patches installed on the box.

-Sri