[OLSR-users] Problem with droptime

[Felix Nattermann]

Hello

OK, I will test it. But now I'm going to make a little bit holliday, so I 
will
write my results in a week. Thank you for your help and have a nice week.

Felix


----- Original Message ----- 
From: "Andreas Tønnesen" <(spam-protected)>
To: "OLSR discussion and development" <(spam-protected)>
Sent: Thursday, March 17, 2005 5:48 PM
Subject: Re: [OLSR-users] Problem with droptime


> 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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>>>>> https://www.olsr.org/mailman/listinfo/olsr-users
>>>>
>>>>
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>>>
>>>
>>> ---------
>>> Andreas Tønnesen
>>> http://www.olsr.org
>>> _______________________________________________
>>> olsr-users mailing list
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>>> https://www.olsr.org/mailman/listinfo/olsr-users
>>
>>
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>
> -- 
> Andreas Tønnesen
> http://www.olsr.org
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