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mdns airgroup problem - mDNS proxy runtime error

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  • 1.  mdns airgroup problem - mDNS proxy runtime error

    Posted Oct 14, 2022 11:51 AM
    Hi

    I'm troubleshooting an issue where Bonjour/mDNS clients, particularly printers, automatically rename themselves because they think that there's another device on the network with the same name.
    I have confirmed that there are no loops on the network (Aruba 2530s with loop-protect active on all switches and ports) and there are certainly no client devices with duplicate names.
    The network setup is very simple. It's a small flat network with the one wireless SSID dropping wireless clients onto the same broadcast domain as the wired devices. The SSID settings are pretty much the default with ARP broadcast filtering enabled. Airgroup is on with the following settings:

    airplay     Enabled   _airplay._tcp          AirPlay
                      _raop._tcp             
                      _appletv-v2._tcp       
airprint    Enabled   _ipp._tcp              AirPrint
                      _pdl-datastream._tcp   
                      _printer._tcp          
                      _scanner._tcp          
                      _http._tcp             
                      _http-alt._tcp         
                      _ipp-tls._tcp          
                      _fax-ipp._tcp          
                      _riousbprint._tcp      
                      _ica-networking._tcp   
                      _ptp._tcp              
                      _canon-bjnp1._tcp      
                      _ipps._tcp             
                      _ica-networking2._tcp  
itunes      Disabled  _home-sharing._tcp     iTunes
                      _apple-mobdev._tcp     
                      _daap._tcp             
                      _dacp._tcp             
remotemgmt  Enabled   _ssh._tcp              Remote management
                      _sftp-ssh._tcp         
                      _ftp._tcp              
                      _telnet._tcp           
                      _rfb._tcp              
                      _net-assistant._tcp    
sharing     Disabled  _odisk._tcp            Sharing
                      _afpovertcp._tcp       
                      _xgrid._tcp            
googlecast  Disabled  _googlecast._tcp       GoogleCast supported by Chromecast etc
AmazonTV    Disabled  _amzn-wplay._tcp       Amazon fire tv

    Possibly related is this entry, constantly repeated, when I 'show log system' on an AP:

    Oct 14 16:48:07  mdns[3768]: <343001> <ERRS> |AP US-3F-ICTRoom@192.168.10.40 mdns|  4149071872 mDNS proxy runtime error at mdns_build_pkt_rec_list 74 RR: xxx-MB-B\.RUSTAGE._ssh._tcp.local^IIN^ISRV 0 0 22 xxx-MB-BRUSTAGE-3.local ; ttl=120 too large; doesn't fit in bulk resp ! 
Oct 14 16:48:08  mdns[3768]: <343001> <ERRS> |AP US-3F-ICTRoom@192.168.10.40 mdns|  4149071872 mDNS proxy runtime error at mdns_build_pkt_rec_list 74 RR: US-Foyer-Photocopier._ipp._tcp.local^IIN^ITXT "txtvers=1" "qtotal=1" "rp=ipp/print" "pdl=application/postscript,image/urf,application/pdf,image/jpeg" "product=(RICOH MP C4503 PS3)" "ty=RICOH MP C4503" "note=ground-Floor" "PaperMax=<legal-A4" "priority=3 
Oct 14 16:48:08  mdns[3768]: <343001> <ERRS> |AP US-3F-ICTRoom@192.168.10.40 mdns|  4149071872 mDNS proxy runtime error at mdns_build_pkt_rec_list 74 RR: Deputy\032Head-\032DL._printer._tcp.local^IIN^ITXT "txtvers=1" "qtotal=4" "rp=AUTO" "pdl=application/postscript,application/vnd.hp-PCL,application/vnd.hp-PCLXL,text/plain" "ty=HP LaserJet P2055dn" "product=(HP LaserJet P2055dn)" "priority=51" "adminurl= 
Oct 14 16:48:09  mdns[3768]: <343001> <ERRS> |AP US-3F-ICTRoom@192.168.10.40 mdns|  4149071872 mDNS proxy runtime error at mdns_build_pkt_rec_list 74 RR: xxx-MB-B\.RUSTAGE._ssh._tcp.local^IIN^ISRV 0 0 22 xxx-MB-BRUSTAGE-3.local ; ttl=120 too large; doesn't fit in bulk resp ! 
Oct 14 16:48:10  mdns[3768]: <343001> <ERRS> |AP US-3F-ICTRoom@192.168.10.40 mdns|  4149071872 mDNS proxy runtime error at mdns_build_pkt_rec_list 74 RR: US-Foyer-Photocopier._ipp._tcp.local^IIN^ITXT "txtvers=1" "qtotal=1" "rp=ipp/print" "pdl=application/postscript,image/urf,application/pdf,image/jpeg" "product=(RICOH MP C4503 PS3)" "ty=RICOH MP C4503" "note=ground-Floor" "PaperMax=<legal-A4" "priority=3 
Oct 14 16:48:10  mdns[3768]: <343001> <ERRS> |AP US-3F-ICTRoom@192.168.10.40 mdns|  4149071872 mDNS proxy runtime error at mdns_build_pkt_rec_list 74 RR: Deputy\032Head-\032DL._printer._tcp.local^IIN^ITXT "txtvers=1" "qtotal=4" "rp=AUTO" "pdl=application/postscript,application/vnd.hp-PCL,application/vnd.hp-PCLXL,text/plain" "ty=HP LaserJet P2055dn" "product=(HP LaserJet P2055dn)" "priority=51" "adminurl= 
Oct 14 16:48:11  mdns[3768]: <343001> <ERRS> |AP US-3F-ICTRoom@192.168.10.40 mdns|  4149071872 mDNS proxy runtime error at mdns_build_pkt_rec_list 74 RR: xxx-MB-B\.RUSTAGE._ssh._tcp.local^IIN^ISRV 0 0 22 xxx-MB-BRUSTAGE-3.local ; ttl=120 too large; doesn't fit in bulk resp ! 
Oct 14 16:48:12  mdns[3768]: <343001> <ERRS> |AP US-3F-ICTRoom@192.168.10.40 mdns|  4149071872 mDNS proxy runtime error at mdns_build_pkt_rec_list 74 RR: US-Foyer-Photocopier._ipp._tcp.local^IIN^ITXT "txtvers=1" "qtotal=1" "rp=ipp/print" "pdl=application/postscript,image/urf,application/pdf,image/jpeg" "product=(RICOH MP C4503 PS3)" "ty=RICOH MP C4503" "note=ground-Floor" "PaperMax=<legal-A4" "priority=3 
Oct 14 16:48:12  mdns[3768]: <343001> <ERRS> |AP US-3F-ICTRoom@192.168.10.40 mdns|  4149071872 mDNS proxy runtime error at mdns_build_pkt_rec_list 74 RR: Deputy\032Head-\032DL._printer._tcp.local^IIN^ITXT "txtvers=1" "qtotal=4" "rp=AUTO" "pdl=application/postscript,application/vnd.hp-PCL,application/vnd.hp-PCLXL,text/plain" "ty=HP LaserJet P2055dn" "product=(HP LaserJet P2055dn)" "priority=51" "adminurl=


    The problem is, the issue is sporadic and doesn't seem to be reproducible and so makes it more difficult to troubleshoot.

    Any suggestions very much welcomed.

    Thank you



  • 2.  RE: mdns airgroup problem - mDNS proxy runtime error

    EMPLOYEE
    Posted Oct 20, 2022 07:00 AM
    Hi sram,

    AirGroup is particularly useful when you have zero configuration services that you would like to be accessible across multiple VLANs. In your case it sounds like all of your devices are within the same broadcast domain so the question is, is AirGroup actually required in your situation?

    https://www.arubanetworks.com/techdocs/Instant_811_WebHelp/Content/instant-ug/services/airgroup/conf-airgroup.htm

    AirGroup Deployment Guide
    Original Message


  • 3.  RE: mdns airgroup problem - mDNS proxy runtime error

    Posted Oct 20, 2022 07:11 AM
    Thank you for taking the time to reply. You raise a valid point and I came to this conclusion last week. I have actually now turned off Airgroup completely but of course it was required when the broadcast filtering was set to its default value of ARP. I have also now disabled broadcast filtering meaning that the APs are simply bridging wireless to wired hence all mDNS services on the wired lan are now available on the wireless and vice versa. Things appear to have stabilised and so I think we're ok for now. 
    We have suggested the implementation of at least one VLAN along with an Aruba CX 6200 to handle the inter-vlan routing. Then we will of course need to re-enable ARP filtering and configure airgroup.

    One thing I struggled with was finding a clear recommendation (or VRD) of how to handle broadcast filtering and airgroup on a flat network. The assumption seems to be that any SSID created will operated on a different VLAN. After this experience I now believe that having the default ARP filtering enabled along with Airgroup configured on a flat network is detrimental and can cause the problems I experienced. 

    Appreciate any thoughts from those more knowledgeable in these areas. 

    Thank you again
    Original Message