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Hello, context : 2 Institutions being part of the eduroam Federation : they both offer the ssid eduroam the 2 institutions are physically closed to each other (on the same campus) A client from Institution_A authenticate 802.1x to ssid eduroam of its institution : after successfull authentication, the client gets a new ip address from the dhcp server of Institution_A The same client walks towards Institution_B : the client associate with ssid eduroam of Institution_B the client authenticate through the federation against its Institution_A authentication server after successfull authentication, the client starts the process of getting an ip address At that point here is what is observed on all iPhone/iPad : the client asks for its previously obtanined ip address from Institution_A (DHCPREQUEST) the dhcp server of Institution_B issues a DHCPNAK to the client because the ip address asked is not part of its subnets the client continuosly repeat the process of asking its former ip address, the process can last for minutes/hours (maybe till the end of lease ?) As a result the client has no wifi working, till the client decide to issue a DHCPDISCOVER and then get a valid new ip address Even after a shutdown, the client keeps on asking the same ip address (to be confirmed, but so far this what has been seen). It is devastating for all our Apple clients. Regards