[OLSR-users] Problem with droptime

[Andreas Tønnesen]

Felix, all,

I have added a fix for link breakage detection. Somewhere along the 
cleanups and rewrites a crucial mechanism regarding links going 
symmetric to asymmetric had been lost... This new fix should make link 
breakage detection work again according to the announced validity time. 
This is really not of too much importance if using a rather unmobile 
network since links _will_ time out, but it will not happen according to 
the registered vtime in all cases.
Felix, could I ask you to try running current CVS olsrd on your nodes 
and report back on the link breakage detection? I can provide you with 
binaries if needed. And thanks for raising this issue :-)

(as always the public cvs rep. needs until tomorrow to be updated)

- Andreas

Felix Nattermann wrote:
> I use the same olsrd.conf on all 3 nodes. I tried a lot of 
> configurations with a
> hello_interval from 1.0 to 0.1 seconds. I also changed the tc_interval. The
> time to find a new route is between 9 and 16 seconds. (And I change only
> between a direct link and a 1-hop-link on an 100Mbit-Ethernet)
> 
> I don't use the GUI. I set the hysteries to "no" and LQ=0 (not used). The
> changes are reflected on the startup output correctly.
> 
> What times to find a new route can I expect in such a szenario? By the way
> if I use a Hello_interval with 0.1 the new route is unstable. (some 
> test-pings
> were dropped)
> 
> Felix
> 
> 
>> Hi,
>>
>> Are you saying that changing intervals has no effect on olsrd operation?
>> Try using HELLO intervals of 0.5 seconds(and validity time of 1.5 secs) -
>> is there no change in olsrd behaviour? If so I would suspect a
>> configuration problem. Are the changes reflected in the olsrd startup
>> output(emission intervals)?
>> BTW are you using LQ, hysteresis or neither?
>>
>> - Andreas
>>
>>>
>>> ----- Original Message -----
>>> From: "lolo" <(spam-protected)>
>>> To: "OLSR discussion and development" <(spam-protected)>
>>> Sent: Monday, March 14, 2005 10:56 AM
>>> Subject: Re: [OLSR-users] Problem with droptime
>>>
>>>
>>>> Hello Felix
>>>>
>>>> OLSR is not very fast at detecting/reestablishing broken roads, so 
>>>> maybe
>>>> are you hitting the limits of it ?
>>>
>>> 10 sec to create a new route in a very simple topology? I hope that it
>>> isn't
>>> the limit
>>>
>>>>
>>>> Maybe you could give us more information about your topology and the
>>>> time
>>>> evolution of it in order
>>>> to check if the timeouts fell inside "theorical" ranges
>>>
>>>
>>> Topology:
>>>
>>> There are only 3 Nodes (A, B and C). First there is a direct link from A
>>> to
>>> C
>>>
>>> A ----- C                    and everythinks goes right.
>>>   \       /
>>>    \    /
>>>      B
>>>
>>> After 5 seconds I change the topology (with iptables) to:
>>>
>>> A --------- B -------- C            so that there is no direct link
>>> between
>>> A and C.
>>>
>>> After 5 seconds the topology will change back. But the 5 sec are not
>>> enougth
>>> that OLSR can create a new route. So I wait for 10 to 15 sec until 
>>> the new
>>> route
>>> is created. So I change in the config file the hello_interval and the
>>> tc_intervall but
>>> nothing realy happens.
>>>
>>> Felix
>>>
>>>>
>>>> Laurent
>>>>
>>>> Felix Nattermann wrote:
>>>>
>>>>> Hello
>>>>> I've got a question. I use OLSR 0.4.8 and use it in an ethernet. I
>>>>> emulate a WLAN with iptables over this ethernet. Now I try to use 
>>>>> Voice
>>>>> over IP over this MANET. There is one big problem. Changes in the
>>>>> topology of the MANET costs a lot of time until the new route is
>>>>> created.
>>>>> (Up to 15 sec.) I try to change the TC_interval and the 
>>>>> Hello_interval,
>>>>> but nothing happens. All pakets are dropped until (after ca. 10 sec)
>>>>> the
>>>>> new route is set.
>>>>>
>>>>> How can I make OLSR 0.4.8 faster, so that there aren't so many
>>>>> paket-drops?
>>>>>
>>>>
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>>
>>
>> ---------
>> Andreas Tønnesen
>> http://www.olsr.org
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> 
> 
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-- 
Andreas Tønnesen
http://www.olsr.org