08-22-2017 07:50 AM - edited 07-05-2021 07:34 AM
Hi all,
we have a WLC 2504 version 8.1 with 2702 access points and have a few mac and ipad users. We have enabled mdns snooping and practically followed bonjour config guide step by step. Mac users on wired network are able to discover printer and print but wireless network are unable. We have tried to use a different network not on WLC and users are able to print so we are sure something is wrong with the WLC. Anyone with any idea on what I am missing.
08-22-2017 11:41 AM
Long shot here. There´s any layer 3 devices before Prineter? Does it allows multicast ?
08-23-2017 03:53 AM
Ric
08-27-2017 11:15 PM
Hi Ric,
Thank you for the reply and apologies for my late response I was not getting Email notifications.
Regards,
Ken
08-29-2017 01:08 AM
08-29-2017 02:40 AM
08-29-2017 05:05 AM
Cheers for the config, I probably need some of the info you've removed.. what VLAN are the wired machines on as well as the interface that is mapped to your WLAN.. and which WLAN is it?
I think you alluded to them all sharing the L2 VLAN so if that's the case you won't even need bonjour gateway, just IGMP snooping enabled on the WLC. You've already said yes to doing that so just trying to understand the topology.
Under mDNS - Domain Names do you see any discovered services on the WLC at all?
Thanks,
Ric
08-29-2017 05:30 AM
Hi Ric,
The the Wlan that is running the services is in the management vlan which is the same vlan that the printer is. On domain names I dont see any discovered services and that is how I know something is wrong.
09-27-2017 12:28 AM
Hi Guys,
Anyone with an idea on this?
09-27-2017 01:55 AM
Hey,
Sorry for not replying before. As your wired/wireless VLAN is the same you shouldn't even need a Bonjour gateway/mDNS snooping - you can turn it off.
With IGMP snooping enabled the WLC should be forwarding these requests between the two. You could tr enabling broadcast forwarding as a test (although preferably that won't be used long term). Is there a possibility to try a different code?
Thanks,
Ric
09-27-2017 02:20 AM
Hi Ric,
Thank you for the reply. we are considering trying a different code although as a last resort but I have two questions
09-27-2017 03:19 AM
So all you need is layer 2 multicast/igmp which is effectively a multicast broadcast across that single VLAN. The layer 3 component for mDNS which is range 224.0.0.250 - 251 doesn't come into play on a routing level because it never gets routed by the WLC or the gateway. Your WLC will need igmp snooping in order to send/receive the requests but that's all.
Do you have igmp snooping enabled on the switches?
I think you've answered this before but just checking - If you plug a Mac laptop into one switch and the Airprint capable printer into the other switch, do you see it discovered on the laptop? Alternatively what is your normal test?
Another workaround is instead of using APs in local mode use them in FlexConnect mode which will lcoally switch all the traffic (bypass the WLC) and all mDNS traffic should forward that way.
Ric
09-27-2017 03:25 AM
Interestingly the release notes say this:
So maybe try configuring your WLC with an address e.g. 239.255.255.10, enable AP multicast-multicast mode and see if that helps.
Ric
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