[avahi] Can't see ALL services using avahi-browse --all option

[Ashwin Vasani]

Can anyone help me out? I can provide more information if something is
unclear.


On Thu, Oct 10, 2013 at 1:50 PM, Ashwin Vasani <vasani.ashwin at gmail.com>wrote:

> Hi all,
>
> I have a query related to avahi-browse. I have an embedded wifi device
> which publishes service of type _http._tcp.local.  This embedded device has
> two interfaces: 1) Micro AP interface
> 2) Station Interface. This service is published on both the interface.
>
> 1) On Mircro AP interface:
> I am trying to resolve this service using avahi-tools.
>
> I could able to resolve this service using "avahi-browse -r _http._tcp",
>
> But using "avahi-browse --all", this is not resolved at all.
>
> Below is the definition of --all option which says it will resolve all
> service irrespective of all type. Then I think _http._tcp should also be
> resolved.
>
> $ avahi-browse --help
> avahi-browse [options] <service type>
> avahi-browse [options] -a
> avahi-browse [options] -D
> avahi-browse [options] -b
>
>     -h --help            Show this help
>     -V --version         Show version
>     -D --browse-domains  Browse for browsing domains instead of services
>     -a --all             Show all services, regardless of the type
>     -d --domain=DOMAIN   The domain to browse in
>     -v --verbose         Enable verbose mode
>     -t --terminate       Terminate after dumping a more or less complete
> list
>     -c --cache           Terminate after dumping all entries from the cache
>     -l --ignore-local    Ignore local services
>     -r --resolve         Resolve services found
>     -f --no-fail         Don't fail if the daemon is not available
>     -p --parsable        Output in parsable format
>     -k --no-db-lookup    Don't lookup service types
>     -b --dump-db         Dump service type database
>
> Further, I also added dns-sd entry in the service type which is published
> by embedded device. This dns-sd entry points to (PTR) to _http._tcp record.
> I added this record by seeing packet structure from the service published
> by "avahi-publish" which sends such entry with the answer.
> Inspite of this, I am not able to resolve this service.
>
> In addition to above, I can't see any initial packets sent by
> "avahi-browse -a" option which shouldn't be the case as resolver can't send
> packets without any questions from the querier. Is there is something
> exception to the rule here? or have I mis-interpreted the protocol ?
>
> 2) On Station Interface, behavior is something different.
> Station interface is connected to Access Point(AP) which is connected to
> network backbone. Here, using "avahi-browse -a" can resolve _http._tcp
> service published by embedded device. Here there is lots of mDNS traffic
> unlike in MicroAP interface.
> But after removing Backbone network from AP, "avahi-browse -a" couldn't
> resolve this service.
>
> This issues is now in critical stage after latest IOS upgrade. I found
> that the implementation of their BonjourDump app is some what similar to
> "avahi-browse -a". But with the older OS, I can see the services.
>
> Can anyone help me out? I can also provide more info if required.
>
> Thanks in advance :-)
>
> --
> With Regards,
> Ashwin Vasani
>



-- 
With Regards,
Ashwin Vasani
+91 8446611430
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