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Re: NDT Behaving Unpredictably


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  • From: Peter Van Epp <>
  • To:
  • Subject: Re: NDT Behaving Unpredictably
  • Date: Thu, 20 Mar 2008 08:39:45 -0700
For what use it is, we have been running ndt on an IBM P510 64 bit
PPC machine on SUSE 10.1 with the pf-ring kernel mods for high speed pcap
capture for quite a while now (unfortunatly the machine is off the network
right now so I can't currently point you to it) without problems other than
getting the kernel built correctly :-). We have been bit quite a few times
by 32 bit librarys so that may be something to look for (although it is
usually
a solid failure not intermittent that I remember).

Peter Van Epp / Operations and Technical Support
Simon Fraser University, Burnaby, B.C. Canada

On Thu, Mar 20, 2008 at 11:17:30AM -0400,

wrote:
> Greetings NDT Users,
>
> I have installed NDT on OpenSuSE 10.3 64 bit. I am having some reliability
> issues. More than 50% of the time, I am getting messages in the applet
> saying that the server is busy. I have attempted to open ports 3001-3003
> and 7123 in the firewall, with no success. I have also shut off the
> firewall completely, with no change. I am very puzzled as to why this may
> be happening...Any ideas?
>
> Thank you in advance for any insight.
> Heather Pegg
>
> Please see all relevent information below:
>
> Command to start NDT: /usr/local/sbin/web100srv -4 -l
> /var/log/web100ndt.log
>
> ---------------------- Applet Output ----------------------
> TCP/Web100 Network Diagnostic Tool v5.5.4
> click START to begin
>
> ** Starting test 1 of 1 **
> Connected to: 155.138.8.29 -- Using IPv4 address
> Checking for Middleboxes . . . . . . . . . . . . . . . . . . Server busy:
> Please wait 30 seconds for previous test to finish
>
> click START to re-test
>
> ** Starting test 1 of 1 **
> Connected to: 155.138.8.29 -- Using IPv4 address
> Checking for Middleboxes . . . . . . . . . . . . . . . . . . Server busy:
> Please wait 30 seconds for previous test to finish
>
> click START to re-test
>
> ** Starting test 1 of 1 **
> Connected to: 155.138.8.29 -- Using IPv4 address
> Checking for Middleboxes . . . . . . . . . . . . . . . . . . Done
> checking for firewalls . . . . . . . . . . . . . . . . . . . Done
> running 10s outbound test (client-to-server [C2S]) . . . . . 27.02Mb/s
> running 10s inbound test (server-to-client [S2C]) . . . . . . 94.61Mb/s
> The slowest link in the end-to-end path is a 100 Mbps Full duplex Fast
> Ethernet subnet
> [C2S]: Packet queuing detected
>
>
> ------------------ Contents of Log ---------------------
> lan8-29:/var/log # tail /var/log/web100ndt.log
> Received SIGALRM signal: terminating active web100srv process [5971]
> [Middlebox test]
> Mar 21 07:02:32 155.138.8.6 port 2850
> spds[0] = ' 0 0 1 2761 1982 7622 6873 6406 1153 0 0 0 248.40 0 0 0 1 0'
> max=7622 [28.44%]
> spds[1] = ' 1 0 1 2755 24 9474 855 301 0 0 2 1 55.12 20 1 13392 0 1'
> max=9474 [70.64%]
> spds[2] = ' 0 10 170 1709 2185 1140 933 420 2483 90 0 10 626.75 0 0 0 1 0'
> max=2483 [27.17%]
> spds[3] = ' 0 0 2 136 2436 2310 2636 361 44 0 3 0 118.10 81 91 7756 0 3'
> max=2636 [33.26%]
> Mar 21
> 07:02:32,155.138.8.6,4889,94949,27128,0,142492,7925,0,0,27739,0,1460,3,7928,65535,245760,108040,9951329,72888,154516,3780377
> 0,2,2,1,0,220,65535,100,0,0,0,0,5,5,8,6,0,27739,0,-1,22,0,0,92,0,30752560,0,0,72,0,0,-1,-1,-1
> Mar 21 07:26:02 155.138.8.11 port 53299
> Mar 21 07:39:22 155.138.8.6 port 3121
> Received SIGALRM signal: terminating active web100srv process [6065]
> [Middlebox test]
>
>
> ------------ Netstat During Successful Run ----------------
> lan8-29:/var/log # netstat -nat
> Active Internet connections (servers and established)
> Proto Recv-Q Send-Q Local Address Foreign Address State
> tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN
> tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN
> tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN
> tcp 0 0 0.0.0.0:3001 0.0.0.0:* LISTEN
> tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN
> tcp 0 0 127.0.0.1:6010 0.0.0.0:* LISTEN
> tcp 0 0 127.0.0.1:6011 0.0.0.0:* LISTEN
> tcp 0 0 155.138.8.29:3003 155.138.8.6:3122
> TIME_WAIT
> tcp 0 0 :::22 :::* LISTEN
> tcp 0 0 ::1:631 :::* LISTEN
> tcp 0 0 ::1:25 :::* LISTEN
> tcp 0 0 ::1:6010 :::* LISTEN
> tcp 0 0 ::1:6011 :::* LISTEN
> tcp 0 0 155.138.8.29:22 155.138.8.11:39735
> ESTABLISHED
> tcp 0 128 155.138.8.29:22 155.138.8.11:48543
> ESTABLISHED
>
> ------------- Netstat During UNsucessful Run ---------------
> lan8-29:/var/log # netstat -nat
> Active Internet connections (servers and established)
> Proto Recv-Q Send-Q Local Address Foreign Address State
> tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN
> tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN
> tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN
> tcp 0 0 0.0.0.0:3001 0.0.0.0:* LISTEN
> tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN
> tcp 0 0 127.0.0.1:6010 0.0.0.0:* LISTEN
> tcp 0 0 127.0.0.1:6011 0.0.0.0:* LISTEN
> tcp 0 0 :::22 :::* LISTEN
> tcp 0 0 ::1:631 :::* LISTEN
> tcp 0 0 ::1:25 :::* LISTEN
> tcp 0 0 ::1:6010 :::* LISTEN
> tcp 0 0 ::1:6011 :::* LISTEN
> tcp 0 0 155.138.8.29:22 155.138.8.11:39735
> ESTABLISHED
> tcp 0 0 155.138.8.29:22 155.138.8.11:48543
> ESTABLISHED
>
> ------------ Kernel Info ------------
> lan8-29:/var/log # uname -a
> Linux lan8-29 2.6.24.1-web100-88-v4 #1 SMP Wed Mar 19 05:54:02 EDT 2008
> x86_64 x86_64 x86_64 GNU/Linux
> lan8-29:/var/log # dmesg | grep -i web100
> Linux version 2.6.24.1-web100-88-v4
> (geeko@buildhost)
> (gcc version 4.2.1 (SUSE Linux)) #1 SMP Wed Mar 19 05:54:02 EDT 2008
> Web100 2.5.19 200802211940 net100: Initialization successful
> lan8-29:/var/log # ls /proc/web100/
> 0 86 header
>
>

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