Wireless Access

Frequent Contributor I

Apple using IPv6 link local addresses instead of DHCP-provided IPv4 addresses



I am experiencing some issues with Apple devices (specially with iPhones).

I have the following setup:

Wireless network with 2 controllers (Master-Standby), and CPPM as a RADIUS server.

I have set up a SSID with 802.1x (EAP-TLS authentication) used to connect mobile devices provided with a certificate (mostly iPhones and iPads). The controller is configured as the DHCP server for this SSID (only DHCPv4, DHCPv6 is disabled)


The issue I experience is the following:


When some devices connect to that SSID, they successfully authenticate (I can see a successful authentication in CPPM access tracker). They also get an IPv4 address from the controller ( I use the commands "logging level debugging network subcat dhcp" and "show log network all | include <client_mac_address>").

However, I can see from the clients that they do not get access to the network. When I look from the controller, I can see that those clients are using IPv6 addresses instead (fe80::/10).

Furthermore, if I manually configure an IPv4, DNS, and default GW in those clients, they can actually connect to the network.

In my opinion, it looks like a problem on the client side. I wonder if someone else has experienced these issues and how I could troubleshoot it

Thank you very much in advance


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