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Multicast mDNS

Martin Schönknecht

Hello is it possible to route 224.0.0.251 that multicast to another interface

at the moment we are using this for apple mobile printing. so the mobile print server is on Port4  and the WLAN iPhones on Port6 (WLAN)

other information:

PrintServer 192.168.12.8 (LAN Port4)

WLAN Device: 192.168.13.78 (WLAN Port6, PoE Switch connected the Sophos AP55C)

I try to establish the communication between the wlan devices and the print server for air print.

 

 

any ideas?

 

cheers



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  • 0

    I’ve spent the past few days researching and testing things out and it doesn’t appear Multicast Forwarding will work with forwarding mDNS from one subnet to another. The mDNS IP 224.0.0.50 is a part of the reserved 224.0.0.0/24 Local Network Control Block which cannot be routed. I don’t think Sophos XG has this capability and you would have to setup a separate device that sits on both subnets running an mDNS reflector. Some of the other firewalls like pfSense or OPNsense have an Avahi plug-in that will act as a mDNS reflector.

    ---

    Sophos XG guides for home users: https://shred086.wordpress.com/

  • 0 in reply to shred

    AFAIK, Sophos XG cannot do mDNS. The only thing they've recommended is running mDNS "on a separate server". Well, that's a deal-breaker for me. The inability for Sophos XG to run Avahi/Bonjour/mDNS/whatever is the only reason I'm having to run OPNsense instead :(

  • 0 in reply to John Conkell

    Well that should end my time with short time with XG also I guess. Hard to believe in 2020 mDNS between vlans is not a thing. People have a lot of iOS devices, at home and in businesses. Not being able to print to air printers is an issue. Not wanting IOT devices running free is important. 

  • 0 in reply to Matt Lebowski

    Hi folks,

    in v18 of XG have you investigated the routing tab and if so with what results?

    Ian

    XG115W - v20 GA - Home

    XG on VM 8 - v20 GA

    If a post solves your question please use the 'Verify Answer' button.

  • 0 in reply to rfcat_vk

    I was going by feedback I've seen around. I'll keep going on with it if you're saying you know it works. 

  • 0 in reply to Matt Lebowski

    Hi Matt,

    I haven't tried the settings, but was suggesting them because none else has. None of my IoT devices broadcast and I use IP addressing for the printers in a mainly MAC environment.

    Ian

    XG115W - v20 GA - Home

    XG on VM 8 - v20 GA

    If a post solves your question please use the 'Verify Answer' button.

  • 0 in reply to rfcat_vk

    Ah damn, I got excited there for a minute, thought maybe it was changed in v18. I'll try some of the tricks that seemed to make it work under Unifi equipment, but based on people with more experience than me configuring this that can't do it... we'll see I guess.

Reply Children
  • 0 in reply to Matt Lebowski

    HI
    I my work around to get mDNS to work across VLANs, setup a small vm (debian 380MB with two NIC) and install avhai reflector.

    You can have one NIC and use vlan. It was jut easier to setup with two nics.

    It would be nice if SophosXG had that feature.

    Hyper-V 2016 | E3-1220 | XG V18 - 5GB RAM, 3 vNIC WAN, LAN, PRIV

  • 0 in reply to pa300

    Hi folks,

    are you saying this function doesn't work?

    Ian

    XG115W - v20 GA - Home

    XG on VM 8 - v20 GA

    If a post solves your question please use the 'Verify Answer' button.

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