[Trac #1026] SCP failures across multi-hop paths

Zarro Boogs per Child bugtracker at laptop.org
Fri Mar 30 21:57:08 EDT 2007


#1026: SCP failures across multi-hop paths
----------------------+-----------------------------------------------------
 Reporter:  jcardona  |        Owner:  andrey 
     Type:  defect    |       Status:  closed 
 Priority:  blocker   |    Milestone:  Trial-1
Component:  wireless  |   Resolution:  fixed  
 Keywords:            |  
----------------------+-----------------------------------------------------
Comment (by jcardona):

 Replying to [comment:18 swagle at marvell.com]:
 > Verified with Luis suggestion and it works fine.The bug can be closed.


 Hmmm, one concern.  There are now ''many'' laptops on your testbed that
 could be shortcutting your multi-hop path.  There are even some xo's
 outside the lab but within wireless range that may be affecting your
 tests.

 To prevent this you should use the blinding table in inverted mode.  When
 the inverted flag is set all traffic is ignored '''except when it is
 received from nodes in the table'''.

 So, to set up a 3-hop path through nodes A, B, C and D you would:

 Node A
 {{{
 iwpriv msh0 bt_set_invert 1
 iwpriv msh0 bt_add B
 }}}

 Node B
 {{{
 iwpriv msh0 bt_set_invert 1
 iwpriv msh0 bt_add A
 iwpriv msh0 bt_add C
 }}}


 Node C
 {{{
 iwpriv msh0 bt_set_invert 1
 iwpriv msh0 bt_add B
 iwpriv msh0 bt_add D
 }}}


 Node D
 {{{
 iwpriv msh0 bt_set_invert 1
 iwpriv msh0 bt_add C
 }}}


 Could you please retest with this configuration?  If the test fails,
 please include the output of the following commands for each node:

 {{{
 for i in `seq 0 127`; do iwpriv msh0 fwt_list $i; done
 }}}
 {{{
 for i in `seq 0 16`; do iwpriv msh0 bt_list $i; done
 }}}
 {{{
 iwpriv msh0 bt_get_invert
 }}}

 Thanks!

-- 
Ticket URL: <http://dev.laptop.org/ticket/1026#comment:19>
One Laptop Per Child <http://laptop.org/>



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