ndt-users list created

[Richard Carlson <>]

Hi Kenny;

There is a bug in the Web100 user library (libweb100) that the NDT server 
process hits.  To see if this is the case, add the "-4" option to the 
web100srv process.  You can modify the /etc/init.d/ndt script to change the 
WEB100SRV_OPTIONS line or manually kill/restart the web100srv process.

The other reason could be a hung web100srv process.  I introduced a bug in 
the client code that MAC and BSD hosts using the command line client can 
trigger.  I've fixed the client code and am looking for a server side fix 
now.  Send me the output from the "netstat -nat" command if the above 
action doesn't fix this problem.

Rich

At 03:04 AM 10/17/2006, Ken Bellars wrote:
> Richard,
>
> I have done the above and now what Ii keep getting is
>
> -------------------------------------------------------------
> Checking for Middleboxes . . . . . . . . . . . . . . . . . .  Protocol error!
> -------------------------------------------------------------
>
> Is any wrong on my side?
>
> Thanks
> Kenny
>
>
> On 10/13/06, Richard Carlson < 
> <mailto:>> wrote:
> Hi Kenny;
>
> Here's a copy of the stuff I add to my /etc/sysctl.conf file.
>
> # NEW parameter for 2.6.13 kernels.  Set to Reno style CC
> net.ipv4.tcp_congestion_control = reno
>
> # TCP Tuning data added 7/28/05 RAC
> # increase Linux TCP buffer limits
> net.core.rmem_max = 33554432
> net.core.wmem_max = 33554432
> net.core.rmem_default = 65535
> net.core.wmem_default = 65535
>
> # increase Linux autotuning TCP buffer limits
> net.ipv4.tcp_rmem = 4096 87380 16777216
> net.ipv4.tcp_wmem = 4096 65535 16777216
> # net.ipv4.tcp_mem = 1024 65535 524288
>
> # Turn on Explicit Congestion Notification (ECN) processing
> net.ipv4.tcp_ecn = 1
>
> A few things to note.
>
> The INSTALL file that comes with the NDT package is suppose to have this
> information.  Unfortunately the current tarball contains a generic GNU
> based INSTALL file.  The NDT specific version has been returned and future
> tarballs will contain this tuning info.
>
> Also note that the net.ipv4.tcp_mem settings are commented out.  Looking at
> the Linux documentation it appears that the kernel does a better job of
> setting the right values than manual intervention.  I recommend letting the
> kernel handle this.
>
> One last thing, the latest Linux 2.6.x kernels do autotuning.  Thus these
> tuning values try and set both reasonable default (64KB) and max limits (16
> - 32 MB).  This autotuning can be turned off by using the NDT "-b value"
> option.  I don't recommend using this option, but it is there in case you
> need it.
>
> To learn more about this follow the links on the main NDT web page to the
> PSC and LBNL tuning pages.  Or google "tcp tuning" to find these pages.
>
> Rich
>
> At 06:32 AM 10/13/2006, Ken Bellars wrote:
>
>
> >I have my NDT running perfectly now.
> >
> >I however noticed that editing the config file sysctl.conf  affects the
> >report.
> >
> >I need to know the best config for the more close to accrate report
> >
> >Thank you.
> >
> >Kenny
>
> ------------------------------------
>
>
>
> Richard A. Carlson                              e-mail: 
> <mailto:>
> Network Engineer                                phone:  (734) 352-7043
> Internet2                                       fax:    (734) 913-4255
> 1000 Oakbrook Dr; Suite 300
> Ann Arbor,  MI  48104

------------------------------------



Richard A. Carlson                              e-mail: 

Network Engineer                                phone:  (734) 352-7043
Internet2                                       fax:    (734) 913-4255
1000 Oakbrook Dr; Suite 300
Ann Arbor,  MI  48104