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220 Fabric OS Administrator’s Guide
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IP Filter policy
7
Source address
For an IPv4 filter policy, the source address has to be a 32-bit IPv4 address in dot decimal notation.
The group prefix has to be a CIDR block prefix representation. For example, 208.130.32.0/24
represents a 24-bit IPv4 prefix starting from the most significant bit. The special prefix 0.0.0.0/0
matches any IPv4 address. In addition, the keyword any is supported to represent any IPv4
address.
For an IPv6 filter policy, the source address has to be a 128-bit IPv6 address, in a format
acceptable in RFC 3513. The group prefix has to be a CIDR block prefix representation. For
example, 12AB:0:0:CD30::/64 represents a 64-bit IPv6 prefix starting from the most significant bit.
In addition, the keyword any is supported to represent any IPv6 address.
Destination port
For the destination port, a single port number or a port number range can be specified. According
to IANA (http://www.iana.org), ports 0 to 1023 are well-known port numbers, ports 1024 to 49151
are registered port numbers, and ports 49152 to 65535 are dynamic or private port numbers.
Well-known and registered ports are normally used by servers to accept connections, while
dynamic port numbers are used by clients.
For an IP Filter policy rule, you can only select port numbers in the well-known port number range,
between 0 and 1023, inclusive. This means that you have the ability to control how to expose the
management services hosted on a switch, but not the ability to affect the management traffic that
is initiated from a switch. A valid port number range is represented by a dash, for example 7-30.
Alternatively, service names can also be used instead of port number. Table 37 lists the supported
service names and their corresponding port numbers.
TABLE 37 Supported services
Service name Port number
echo 7
discard 9
systat 11
daytime 13
netstat 15
chargen 19
ftp data 20
ftp 21
fsp 21
ssh 22
telnet 23
smtp 25
time 27
name 42
whois 43
domain 53