![]() ![]() Since the WLC knows the details of the multicast server and its services, the WLC can provide that info to the wireless in unicast packets. ![]() When a wireless client wants to get multicast stream from a multicast server, and the client is in a vlan different from that of the vlan of the multicast server: if (mDNS not being used) Benefit Its better to understand how Bonjour works, to understand how Apple clients work, to understand what is that the WLC needs to do to work with Apple clients, which use Bonjour protocol.īonjour publishes services to 'mDNS responders'('which' when get queries from multicast clients while discovering for the services) provides those services. The mDNS feature, makes the Cisco WLC, act as the mDNS-query-responder, for Apple's wireless clients.Īll those services which may be requested by the wireless clients (serviced by the signals of the APs joined to a controller) are registered with the WLC in question (mDNS responders), so that if-and-when, an mDNS responder (WLC) gets a DNS query for SRV records, the mDNS responder should cognize the service type in the query as a known entity, being asked for, and be able to return PTR records for the requested Service Types. (mDNS is nothing but the latter aforesaid feature of any DNS server as indicated in the statement above) These ip addresses can just not be the ip-equivalent of the FQDNs requested by the browsers but also may refer to the services being requested by the clients. Its a known fact that the purpose of DNS is to serve/provide ip addresses. How to overcome limitationĭue to mDNS feature, the aforesaid limitation doesn't apply to the Apple clients, anymore! This is why Bonjour is also termed as a Link Local Protocol. LimitationĪpple clients (which use Bonjour) can talk to multicast servers, only if the latter are in same subnet as that of the former. 1- Apple devices use Bonjour to communicate multicast trafficĢ- Bonjour is a Service Discovery Protocol (link local protocol)ģ- Services can be across multitude of subnets, away from the subnet of the service-subscriber Multicast Traffic Stream seeking client subscribes/requests for the service, whereas Multicast Traffic Stream Provider provides/serves the traffic for the service.įrom 1,2 and 3, its clear that there needs to be a mechanism, by using with the Services can be advertised across subnets, so that the Apple clients using link local protocol called Bonjour, can discover the services, across subnets. ![]()
0 Comments
Leave a Reply. |