network problem

[dgizaw]

I have a problem resolving a network problem whenever I set the network card to 100 full duplex and auto negotiation to on then it automatically changes to half duplex. When I reset it back to manuall then it will be 100 full duplex. But the speed is like 200kb/s. When I do traceroute I get Warning: Multiple interfaces found ... and then it comes back with ***** until I interrupt it. When I disable the second interface the speed will be ok like 6.2 MB/s. How I can make work both interfaces with 100 FDX ?

Thank you

[Ashwani Kashyap]

Check at the switch ports . The ports where your server are plugged in might not be 100 FD . It could be only half duplex . Thats why when u turn auto negotiation on , it drops to half duplex . Turn auto negotiation off as well .

[A. Clay Stephenson]

There is a fundamental problem with Auto-negotiation. You need to edit the ehternet card configuration files in /etc/rc.config.d and set the value to 100FD AND then set the corresponding port on your switch to 100FD as well.

Hard setting the values on both ends will solve your problems.

[Darrell Allen · Accepted solution]

Many times auto-negiotiate fails to work correctly. I always set my servers to the desired setting and the switch ports they are connected to.

You can not set the card to a speed/duplex (ie 100FD) and set autoneg on as well. It's either one or the other. Manually setting the speed/duplex turns off autoneg. Setting autoneg on overlays any manual speed/duplex setting you previously specified.

Again, I suggest you manually set the speed/duplex at the switch and the server for any server. I've simply seen autoneg fail too often.

I don't understand what you are saying about the multiple interfaces. Do you have more than one network card on the server? What do "ioscan -fnC lan" and "lanscan" report?

Darrell

[dgizaw]

Yes, I have two network cards one is the primary and the other one is going to a tape backup server. Both are on separate subnet.
The ioscan -fnC lan gives me :

lan 0 ... btlan .. HP PCI 10/100Base-TX Core
/dev/diag/lan0 ...... /dev/lan0

lan 1 .. btlan ... HP A5230A/B5509BA PCI 10/100base....
/dev/diag/lan1 ... /dev/lan1

lan 2 .. btlan ... HP A5230A/B5509BA PCI 10/100Base ...,
/dev/diag/lan2 ... /dev/lan2


Before I upgraded it to HP-UX 11i it was wroking fine. Do I need any patch ?

The switch is tuned off the auto negotiation.
But the problem is still there.


Thank you very much

[Darrell Allen]

Does ifconfig (and / or netstat -ni) show the IP addresses you expect?

Are the interfaces listed as being on different networks / subnets?

Is your routing table okay (netstat -nr)?

What are the switch ports set to (speed / duplex)? You need to match that on the HP side.

Darrell

[rick jones]

One cannot set a NIC or switch port to both 100FD _and_ Autoneg at the same time. They are mutually exclusive.

Also, as pointed-out, _both_ sides of the link need to be set to the _same_ value. If one side is auto and the other hardcoded autoneg "fails" (as per the spec) and the link is brought-up in 100HD

[Ken Hubnik_2]

Best not to use auto-negotiate on the server nic or the switch. Manually code both to be 100 FUll duplex.

[dgizaw]

Thank you all for the help. Everything looks ok now after I set it to 100FD manual from the server and the switch side. It was jumping to 100HD or 10FD every time I set it up. This took us more than three days. Now it looks stable. I also set it in the hpbtlanconf file. The HP support told me to use -i option and the lan# (traceroute -i lan0 xxx.xxx.xxx.xxx) for traceroute command on HP-UX 11.11.


I realy appriciate all of you

Daniel