Configuration Guide User guide

1712 FastIron Configuration Guide
53-1002494-02
Standard named ACL configuration
The <ACL-num> parameter allows you to specify an ACL number if you prefer. If you specify a
number, you can specify from 1 – 99 for standard ACLs.
NOTE
For convenience, the software allows you to configure numbered ACLs using the syntax for named
ACLs. The software also still supports the older syntax for numbered ACLs. Although the software
allows both methods for configuring numbered ACLs, numbered ACLs are always formatted in the
startup-config and running-config files in using the older syntax, as follows.
access-list 1 deny host 209.157.22.26 log
access-list 1 deny 209.157.22.0 0.0.0.255 log
access-list 1 permit any
access-list 101 deny tcp any any eq http log
The deny | permit parameter indicates whether packets that match a policy in the access list are
denied (dropped) or permitted (forwarded).
The <source-ip> parameter specifies the source IP address. Alternatively, you can specify the host
name.
NOTE
To specify the host name instead of the IP address, the host name must be configured using the
DNS resolver on the Brocade device. To configure the DNS resolver name, use the ip dns
server-address… command at the global CONFIG level of the CLI.
The <wildcard> parameter specifies the mask value to compare against the host address specified
by the <source-ip> parameter. The <wildcard> is in dotted-decimal notation (IP address format). It
is a four-part value, where each part is 8 bits (one byte) separated by dots, and each bit is a one or
a zero. Each part is a number ranging from 0 to 255, for example 0.0.0.255. Zeros in the mask
mean the packet source address must match the <source-ip>. Ones mean any value matches. For
example, the <source-ip> and <wildcard> values 209.157.22.26 0.0.0.255 mean that all hosts in
the Class C subnet 209.157.22.x match the policy.
If you prefer to specify the wildcard (mask value) in CIDR format, you can enter a forward slash after
the IP address, then enter the number of significant bits in the mask. For example, you can enter
the CIDR equivalent of “209.157.22.26 0.0.0.255” as “209.157.22.26/24”. The CLI automatically
converts the CIDR number into the appropriate ACL mask (where zeros instead of ones are the
significant bits) and changes the non-significant portion of the IP address into ones. For example,
if you specify 209.157.22.26/24 or 209.157.22.26 0.0.0.255, then save the changes to the
startup-config file, the value appears as 209.157.22.0/24 (if you have enabled display of subnet
lengths) or 209.157.22.0 0.0.0.255 in the startup-config file.
If you enable the software to display IP subnet masks in CIDR format, the mask is saved in the file
in “/<mask-bits>” format. To enable the software to display the CIDR masks, enter the ip
show-subnet-length command at the global CONFIG level of the CLI. You can use the CIDR format
to configure the ACL entry regardless of whether the software is configured to display the masks in
CIDR format.
NOTE
If you use the CIDR format, the ACL entries appear in this format in the running-config and
startup-config files, but are shown with subnet mask in the display produced by the show ip
access-list command.