topic Re: network is not stable. in Operating System - HP-UX

network is not stable.

David Shao — Wed, 03 Apr 2002 01:09:25 GMT

Some time,my hp v2250 will lose some packages.
I dont know how to check the problem in operating system log file.

Re: network is not stable.

Michael Tully — Wed, 03 Apr 2002 02:34:29 GMT

Hi,

The first thing to check would be the amount
of information being displayed from lanadmin

# lanadmin
--> lan
--> display
and view the statistics on the second screen.
Post the results, it may indicate that the
lan card and your switch are not communicating
correctly.

Michael

Re: network is not stable.

Printaporn_1 — Wed, 03 Apr 2002 02:38:35 GMT

Hi,

Does IP address conflict ?
check with
#netfmt -t 50 -f /var/adm/nettl.LOG00 > /tmp/nettl

then check /tmp/nettl.

Re: network is not stable.

Ron Kinner — Wed, 03 Apr 2002 03:51:37 GMT

Are you losing packets on the local LAN or over the WAN? How do you know you are losing packets?

If local LAN check lanadmin stats. Odds are it's caused by a duplex mismatch. Set both the HP and the switch to the same speed and duplex. Autonegotiate has its problems. Also we had a problem with a NIC that was sensitive to EMF. What kind of card do you have?

If WAN check netstat -s and ask your router guy about errors and packet drops and if he has any queuing in effect.

Ron

Re: network is not stable.

David Shao — Thu, 04 Apr 2002 01:05:12 GMT

The lanadmin display output is as follows:
PPA Number = 4
Description = lan4 HP 1000Base-SX Adapter HW Rev X-3814
Type (value) = ethernet-csmacd(6)
MTU Size = 1500
Speed = 1000000000
Station Address = 0x60b0c421b5
Administration Status (value) = up(1)
Operation Status (value) = up(1)
Last Change = 15
Inbound Octets = 1465851552
Inbound Unicast Packets = 7199949
Inbound Non-Unicast Packets = 154739242
Inbound Discards = 0
Inbound Errors = 0
Inbound Unknown Protocols = 154738939
Outbound Octets = 964793836
Outbound Unicast Packets = 7199954
Outbound Non-Unicast Packets = 0
Outbound Discards = 0
Outbound Errors = 0
Outbound Queue Length = 0
Specific = 655367

Is there some error?

Also,I didn't find any error message in nettl.LOG00.

Re: network is not stable.

David Shao — Thu, 04 Apr 2002 01:17:00 GMT

Losing package is in my local LAN,I found this because sometime I couldn't telnet it and about 20 seconds later I did.

I don't know my network card model,how to check it?

Thanks.

Re: network is not stable.

Michael Tully — Thu, 04 Apr 2002 01:37:15 GMT

Hi,

First thing:

Can you provide the second page of the statistics from 'lanadmin' please. This will tell us whether you could have a full-duplex/half duplex mismatch.

Second:

To get the type of lan cards:

# /usr/sbin/ioscan -fnkC lan

HTH
-Michael

Re: network is not stable.

Ron Kinner — Thu, 04 Apr 2002 03:01:04 GMT

Without the second page we can't see the collisions but there is something very odd about the first page. Your
Inbound Unknown Protocols = 154738939

is almost the same as your

total
Inbound Non-Unicast Packets = 154739242

This means that most of your broadcast traffic is stuff that your PC can't understand. This might be normal spanning tree traffic or it might mean that you need to reduce your broadcast domain or look into shutting up some of the big talkers. We don't run spanning tree since it's a single switch so I can't compare but on my lanadmin for the 100 FD I see only 28 inbound unknown protocols for about the same number of inbound packets.

Ron

Re: network is not stable.

David Shao — Mon, 08 Apr 2002 05:09:17 GMT

Hi,

The second page of lanadmin display is as follows:

Ethernet-like Statistics Group

Index = 1
Alignment Errors = 0
FCS Errors = 0
Single Collision Frames = 0
Multiple Collision Frames = 0
Deferred Transmissions = 0
Late Collisions = 0
Excessive Collisions = 0
Internal MAC Transmit Errors = 0
Carrier Sense Errors = 0
Frames Too Long = 0
Internal MAC Receive Errors = 0