4 ms·

Of course, not all routers (particularly combo router/modems provided by your ISP) support multicast DNS, so often this isn't an option.

cstejerean 3y ago
I haven't seen a home router that doesn't support Bonjour in the past decade. It's a fundamental component in the Apple ecosystem and any home router that didn't allow one to wireless print from their iPhone would be considered broken.
- brokenmachine 3y ago
  Do people really wireless print from their iPhone? Not once can I say I've wanted to print from my phone.
  - atlanta90210 3y ago
    Yes iphone wireless printing works great esp PDF attachments in emails. I use it quite a bit.
zamadatix 3y ago
The router doesn't really need to support anything, the mDNS packets just flood the bridge domain directly between clients like any other flooded packet.
- ulope 3y ago
  That’s the nice thing about mDNS. No flooding of anything since it’s multicast and not broadcast.
  - deleted 3y ago
    [deleted]
  - zamadatix 3y ago
    It would be nice... if it were actually "real" multicast :). It's instead link-local multicast, which has none of the filtering advantages of traditional IP multicast (i.e. no group joining via IGMP is performed for the switches/routers to be able learn who actually needs to listen) https://community.cisco.com/t5/switching/route-igmp-link-local-groups/td-p/2529166 https://community.cisco.com/t5/switching/route-igmp-link-loc... https://community.cisco.com/t5/switching/multicast-on-the-lan/td-p/3859331#:~:text=To%20be%20noted%20IGMP%20snooping%20does%20not%20process%20link%20local%20multicast%20addresses%20224.0.0.X%20that%20are%20still%20fllooded https://community.cisco.com/t5/switching/multicast-on-the-la.... The advantage of link-local multicast over a plain broadcast is it gives a unique address (IP and multicast) so the clients themselves can more easily filter them. That's about it. An mdns aware router just enables MORE flooding to happen (across subnet boundaries, where link-local is not supposed to go).
- skykooler 3y ago
  Starlink routers don't forward mDNS packets between clients, and neither did our Fios router before that.

cstejerean 3y ago

I haven't seen a home router that doesn't support Bonjour in the past decade. It's a fundamental component in the Apple ecosystem and any home router that didn't allow one to wireless print from their iPhone would be considered broken.

brokenmachine 3y ago
Do people really wireless print from their iPhone? Not once can I say I've wanted to print from my phone.
- atlanta90210 3y ago
  Yes iphone wireless printing works great esp PDF attachments in emails. I use it quite a bit.

zamadatix 3y ago

The router doesn't really need to support anything, the mDNS packets just flood the bridge domain directly between clients like any other flooded packet.

ulope 3y ago
That’s the nice thing about mDNS. No flooding of anything since it’s multicast and not broadcast.
- deleted 3y ago
  [deleted]
- zamadatix 3y ago
  It would be nice... if it were actually "real" multicast :). It's instead link-local multicast, which has none of the filtering advantages of traditional IP multicast (i.e. no group joining via IGMP is performed for the switches/routers to be able learn who actually needs to listen) https://community.cisco.com/t5/switching/route-igmp-link-local-groups/td-p/2529166 https://community.cisco.com/t5/switching/route-igmp-link-loc... https://community.cisco.com/t5/switching/multicast-on-the-lan/td-p/3859331#:~:text=To%20be%20noted%20IGMP%20snooping%20does%20not%20process%20link%20local%20multicast%20addresses%20224.0.0.X%20that%20are%20still%20fllooded https://community.cisco.com/t5/switching/multicast-on-the-la.... The advantage of link-local multicast over a plain broadcast is it gives a unique address (IP and multicast) so the clients themselves can more easily filter them. That's about it. An mdns aware router just enables MORE flooding to happen (across subnet boundaries, where link-local is not supposed to go).
skykooler 3y ago
Starlink routers don't forward mDNS packets between clients, and neither did our Fios router before that.