buglwIP - A Lightweight TCP/IP stack - Bugs: bug #55024, mDNS: does not respond to probes...

 
 

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bug #55024: mDNS: does not respond to probes via multicast

Submitter:  Jasper Verschueren <jasperv>
Submitted:  Wed 14 Nov 2018 03:48:56 PM UTC
   
 
Category:  apps Severity:  3 - Normal
Item Group:  Faulty Behaviour Status:  Fixed
Privacy:  Public Assigned to:  None
Open/Closed:  Closed Planned Release:  None
lwIP version:  git head

Wed 14 Nov 2018 03:54:23 PM UTC, comment #1: 

Pushed, thanks!!!

Dirk Ziegelmeier <dziegel>
Group administrator
Wed 14 Nov 2018 03:48:56 PM UTC, original submission:  

The mDNS responder only responds to a probe query via unicast because according to the RFC, a probe should have the QU bit on.
At the moment the QU bit is ignored and a probe is always answered via unicast (is easier, no multicast timeout issues).
After more testing we found that not all implementations follow the RFC's should (avahi-daemon for example). Avahi sends it's probe messages with the QM flag. This can easily be seen when publishing a service via avahi-publish.

This commit adds support for multicast probe answering with the needed timeouts etc.

Jasper Verschueren <jasperv>

 

(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)

Attached Files

 

Depends on the following items: None found

Items that depend on this one: None found

 

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    Follow 3 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2018-11-14 dziegel StatusNone Fixed
        Open/ClosedOpen Closed
    2018-11-14 jasperv Attached File- Added 0001-mDNS-respond-to-probe-via-multicast-added.patch, #45423

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