Re: [Ekiga-list] DOS problem

[Eugen Dedu <Eugen Dedu pu-pm univ-fcomte fr>]

Damien Sandras wrote:
> Le jeudi 15 octobre 2009 à 15:26 +1000, bnc netspeed com au a écrit :
>> Hi,
>> I have mentioned this problem before but I now have some more info.
>>
>> I have about 40 numbers in my contact list, when ekiga tries to
>> register it issues a dns subscribe request for every single phone
>> number really quickly and repeats this.
>> I have just rung my isp and they saw the requests coming in and treat
>> it as a DOS attack and block my phone for 30mins.
>> Hence the registration drops out, and the cycle starts again.
>>
>> In my case most of my contact list are normal phones not actual sip
>> addresses, it makes no sense to try to determine their status.
>>
>> So my ekiga 3.2.6 is unusable at present.
>>
>> Please advise if there is a way to turn this function off.
> 
> There is no way currently.
> I do not know how to fix that without adding a new obscure setting to
> Ekiga.
> 
> Perhaps using the address book would be more appropriate than the
> contact list for that specific case ?

The problem is not that ekiga does a DNS request for each contact (even
if a DNS cache could be implemented in opal to optimise this); the
problem is that it issues many DNS requests.  How does this happen?

Could that be a DNS configuration problem?  Reporter, could you check:
- how many DNS requests are sent with only one contact (one or many?)
(In *normal* gconf configuration, you could save your config  with "cp
-a .gconf/apps/ekiga .gconf/apps/ekiga-save", and restore it afterwards)
- with wireshark if your firsts DNS requests receive errors, so ekiga
tries DNS requests again?

-- 
Eugen