#10450 NORM 11.2.0-: No leave signal in Salut, when changing the network

Zarro Boogs per Child bugtracker at laptop.org
Thu Jul 7 11:08:48 EDT 2011

#10450: No leave signal in Salut, when changing the network
           Reporter:  erikos            |       Owner:  erikos                                 
               Type:  defect            |      Status:  new                                    
           Priority:  normal            |   Milestone:  11.2.0-M4                              
          Component:  presence-service  |     Version:  1.5/1.0 Software Build os852 aka 10.1.2
         Resolution:                    |    Keywords:  collaboration                          
        Next_action:  diagnose          |    Verified:  0                                      
Deployment_affected:                    |   Blockedby:                                         
           Blocking:                    |  

Comment(by erikos):

 For the sake of it, the [http://files.multicastdns.org/draft-cheshire-
 dnsext-multicastdns.txt muticastdns spec (section 10.1.)] does foresee a
 'goodbye'-packet when "a host knows that certain resource record data is
 about to become invalid (for example when the host is undergoing a clean
 shutdown)" then "the host SHOULD send an unsolicited mDNS response packet,
 giving the same resource record name, rrtype, rrclass and rdata, but an RR
 TTL of zero. This has the effect of updating the TTL stored in neighboring
 hosts' cache entries to zero, causing that cache entry to be promptly

 In the case of changing the network avahi does probably not get notified
 about that change and therefore does not send the goodbye packet, maybe NM
 could be instructed to inform avahi about that.

 However after a certain timeout the cache should release the entry and
 that does not seem to be the case neither.

Ticket URL: <http://dev.laptop.org/ticket/10450#comment:5>
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