Table 8. CIDR subnet mask information (continued)
Subnet Mask CIDR Equivalent Note
255.255.255.192 /26 62 usable
255.255.255.128 /25 126 usable
255.255.255.0 /24 Class C 254 usable
255.255.254.0 /23 2 Class Cs
255.255.252.0 /22 4 Class Cs
255.255.248.0 /21 8 Class Cs
255.255.240.0 /20 16 Class Cs
255.255.224.0 /19 32 Class Cs
255.255.192.0 /18 64 Class Cs
255.255.128.0 /17 128 Class Cs
255.255.0.0 /16 Class B
255.254.0.0 /15 2 Class Bs
255.252.0.0 /14 4 Class Bs
255.248.0.0 /13 8 Class Bs
255.240.0.0 /12 16 Class Bs
255.224.0.0 /11 32 Class Bs
255.192.0.0 /10 64 Class Bs
255.128.0.0 /9 128 Class Bs
255.0.0.0 /8 Class A
254.0.0.0 /7 2 Class As
254.0.0.0 /6 4 Class As
252.0.0.0 /5 2 Class As
248.0.0.0 /4 8 Class As
224.0.0.0 /3 16 Class As
192.0.0.0 /2 32 Class As
128.0.0.0 /1 64 Class As
0.0.0.0 /0 IP space
Authentication Method Decision Tree:
The Storwize V7000 Unified systems require one, and only one, authentication
system to allow network users to access file systems or file sets exported (shared)
by the Storwize V7000 Unified system. The authentication system may also be
used to provide User ID mapping. Several authentication methods are supported.
They are:
v Microsoft Active Directory - with or without SUA / SFU
v Lightweight Directory Access Protocol (LDAP)
v Network Information Service (NIS
A local LDAP server can also be used which runs on the file modules, but this is
limited. For example it does not support asynchronous filesystem replication to
another Storwize V7000 Unified system. Refer to Managing authentication and ID
mapping, located in the Information Center.
20 Storwize V7000 Unified: Quick Installation Guide
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