11.3.5 Assigning addresses to the HMC and SE An HMC can have the following IP configurations: An SE can have the following IP addresses: IP addresses on the SE cannot be dynamically assigned through DHCP to ensure repeatable  address assignments. Privacy extensions are not used. The HMC uses IPv4 and IPv6 multicasting$^{2}$ to discover automatically SEs. The HMC Network  Diagnostic Information task can be used to identify the IP addresses (IPv4 and IPv6) that are  being used by the HMC to communicate to the CPC SEs. IPv6 addresses are easily identified. A fully qualified IPV6 address features 16 bytes. It is  written as eight 16-bit hexadecimal blocks that are separated by colons, as shown in the  following example: 2001:0db8:0000:0000:0202:b3ff:fe1e:8329 GLYPH<SM590000> Statically assigned IPv4 or statically assigned IPv6 addresses GLYPH<SM590000> Dynamic Host Configuration Protocol (DHCP)-assigned IPv4 or DHCP-assigned IPv6  addressees GLYPH<SM590000> Auto-configured IPv6: – Link-local is assigned to every network interface.  – Router-advertised, which is broadcast from  the router, can be combined with a Media  Access Control (MAC) address to create a unique address. – Privacy extensions can be enabled for these addresses as a way to avoid the use of  the MAC address as part of the address to ensure uniqueness. GLYPH<SM590000> Statically assigned IPv4 or statically assigned IPv6 GLYPH<SM590000> Auto-configured IPv6 as link-local or router-advertised Because many IPv6 addresses are not fully qualified, shorthand notation can be used. In  shorthand notation, the leading zeros can be omitted, and a series of consecutive zeros can  be replaced with a double colon. The address in the previous example also can be written in  the following manner: 2001:db8::202:b3ff:fe1e:8329 If an IPv6 address is assigned to the HMC for remote operations that use a web browser,  browse to it by specifying that address. The address must be surrounded with square  brackets in the browser’s address field, as shown in the following example: https://[fdab:1b89:fc07:1:201:6cff:fe72:ba7c] The use of link-local addresses must be supported by your browser. Multi-factor authentication is an optional feature, which is configured on per-user,  per-template basis. It enhances security of the z14 models by requiring not only what you  know, which is first factor, but also what you have available, which means that only person  who owns a specific phone number can log in.  11.3.6 HMC Multi-factor authentication 2 For a customer-supplied switch, multicast must be enabled at the switch level. Chapter 11. Hardware Management Console and Support Elements  373