[OLSR-users] network problems

[Andrew Hodel]

Thanks for the responses.

There is no NAT on the wlan interfaces, so that is not the problem. 
Lowering the MTU will not change anything if the frag thr is lower
then mtu correct?

I generated the map with a perl script I hacked together to stitch
data from google maps.

http://www.nxwi.org/index.php?n=gmapsHacking

I will try other things such as manual routes and different antennas,
but I think the best thing to do will be to take the high points and
shoot a direct link on 5ghz, then put an 802.11b HNA node there.  All
will be going out the same t1, but with more spread for the HNA nodes.

One question I am still wondering, which is a more of a network
question: would a route change cause a stream (ssh, aol, download) to
die.  It seems true?



Thanks,
Andrew

On 6/17/05, Sven-Ola Tuecke <(spam-protected)> wrote:
> Hi,
> 
> well, normally the links are simply bad if you experience this. An LQ of ~
> 0.8 means, you will loose around 25% of all packets (with frag=256!). Even
> if wlan layer will do retries, such link may be usable for short ssh
> sesssions but for nothing else.
> 
> Verify by switching off olsrd and type in some manual routes. If things are
> better now, you have a olsrd problem. Otherwise try better antennas, other
> channels, other devices, more intermediate hops, [Insert your favorite link
> technology here]...
> 
> I personally think, no direct link which does not reach at least 32kbyte/sec
> for 15 minutes is unusable. For ssh sessions you may try to lower the MTU on
> the originators wlan interface also.
> 
> You do not use NAT on the wlan interfaces, do you? Ssh in a box, then check
> with "who". If the IP of the source-box is displayed no NAT is there...
> 
> Rgds,
> Sven->Ola
> 
> "Andrew Hodel" <(spam-protected)> schrieb im Newsbeitrag
> news:(spam-protected)
> Our network, with 23 nodes is having serious issues with packet loss
> and dying connections on a few nodes.  Regardless of a route change,
> should ssh stay connected?  We have rts at 64 and frag set to 256, ssh
> last about 3 seconds on any route over 3 hops.  We have tried rate
> 5.5M fixed to avoid lossy links.  You can't even view 640x480 images
> on the web, by the time the image is finished the connection has
> dropped and you get 1/3 of it.  LQ on the links is reported as 1 or
> .9, at the lowest .8 and these are the links with problems.  Is there
> anything I can do to fix this, would hysterisis resolve this?
> 
> You can view an image of our network at: http://www.nxwi.com/pa_map.png
> 
> Nodes # 17,5,19,6,22,8,and 7 have these problems.  I realize they are
> the farthest, however the LQ is .9 or 1.
> 
> The hna node is node 1.
> 
> 
> 
> Any ideas?
> 
> 
> 
> Thanks,
> Andrew
> _______________________________________________
> olsr-users mailing list
> (spam-protected)
> https://www.olsr.org/mailman/listinfo/olsr-users
> 
> _______________________________________________
> olsr-users mailing list
> (spam-protected)
> https://www.olsr.org/mailman/listinfo/olsr-users
>