It sounds like you are having issues with multicast packet wakeups, which have always been a bit of a sore spot.<br><br>I presume you are using ad-hoc networking, and have not left the XOs idling to the point they shutdown their screen turns black and the wifi card is turned off (~20 minutes?). If this is with a schoolserver it still could be a known issue but might be worth raising again.<br>
<br>Wake-on-LAN behavior with the 8686 wireless card is not as reliable at it should be. XOs need to wake up on multicast events to receive data (multicast DNS) about the network neighborhood, but need to clearly hear such announcements {i.e. no collisions with another data packet}, and sometimes don't get them even if the XO is awake. In crowded cities where there are lots of access points and other computers nearby this becomes more of a problem.<br>
<br>And since updates are only sent every few minutes, it could take quite a while for everything to get synched up, with things lost along the way.<br><br>Schoolservers/Jabber servers use TCP connections, should be retrying at the TCP level, and should not run into these issues unless a XO went fully into suspend (black screen/etc.) with the wifi card off. If a XO is connected to a schoolserver/Jabber it will not show ad-hoc users even if they are on the same network.<br>
<br>The ad-hoc networking model definitely could be improved but I do not know if anyone has ever taken up that task.<br><br>There are several tickets on the subject; I do not recall filing any against 13.1.0 yet though.<br>
<br><br><div class="gmail_quote">On Tue, Dec 18, 2012 at 12:40 PM, nitika.mail <span dir="ltr"><<a href="mailto:nitika@activitycentral.com" target="_blank">nitika@activitycentral.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<span style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif">Hi All,</span><div style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif">
<br></div><div style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif"> Peer XOs are NOT shown in Neighborhood view when Power Management is enabled.</div><div style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif">
<br></div><div style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif">Tested on 31016o2 OLPC Image (Build 16) on two XO-1.75's... one Touch and the other Non-Touch. Following observations were made:</div>
<div style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif"><br></div><div style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif">
1. Having connected both the XO's to a network, when neighborhood view was seen on both the XO's, only one XO displayed the other in its neighborhood view. The second XO was all alone in the neighborhood view.</div>
<div style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif"><br></div><div style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif">
2. At some point, due to suspending an XO (or network re-connect), same thing can be observed on either of the XO's</div><div style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif">
<br></div><div style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif">3. When Power management was disabled and system rebooted, this issue was not observed.</div><div style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif">
<br></div><div style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif">4. This has yet been observed only on XO-1.75's.</div><div style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif">
<br></div><div style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif">If anyone has observed this issue, please do advise.</div><div style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif">
<br></div><div style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif">Also, does this call for raising a bug?</div><div style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif">
<br></div><div style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif">Thanks and Regards,</div><div style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif">
<br></div><div style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif">Nitika Mangal</div><div style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif">
QA Manager</div><div style="color:rgb(34,34,34);font-size:13px;font-family:arial,sans-serif">Activity Central: <a href="http://activitycentral.com/" style="color:rgb(17,85,204)" target="_blank">http://activitycentral.com</a></div>
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<br></blockquote></div><br>