Brocade Communications Systems Brocade ICX 6650 6650 - Manual (Page 117)

Brocade ICX 6650 Security Configuration Guide 97
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Extended named ACL configuration
• Internet Control Message Protocol (ICMP)
• Internet Group Management Protocol (IGMP)
• Internet Gateway Routing Protocol (IGRP)
• Internet Protocol (IP)
• Open Shortest Path First (OSPF)
• Transmission Control Protocol (TCP)
• User Datagram Protocol (UDP)
For TCP and UDP, you also can specify a comparison operator and port name or number. For
example, you can configure a policy to block web access to a specific website by denying all TCP
port 80 (HTTP) packets from a specified source IP address to the website’s IP address.
Extended named ACL syntax
Syntax: [no] ip access-list extended ACL-name deny | permit ip-protocol source-ip | hostname
wildcard [operator source-tcp/udp-port] destination-ip | hostname [icmp-num |
icmp-type] wildcard [tcp/udp comparison operator destination-tcp/udp-port]
[802.1p-priority-matching <0 –7>] [dscp-cos-mapping ] [dscp-marking <0-63>
[802.1p-priority-marking <0 –7>... | dscp-cos-mapping]] [dscp-matching <0-63>] [log]
[precedence name | <0 – 7>] [tos <0 – 63> | name] [traffic policy name]
The ACL-name parameter is the access list name. You can specify a string of up to 256
alphanumeric characters. You can use blanks in the ACL name if you enclose the name in
quotation marks (for example, “ACL for Net1”).
The deny | permit parameter indicates whether packets that match the policy are dropped or
forwarded.
The ip-protocol parameter indicates the type of IP packet you are filtering. You can specify a
well-known name for any protocol whose number is less than 255. For other protocols, you must
enter the number. Enter “?” instead of a protocol to list the well-known names recognized by the
CLI.
The source-ip | hostname parameter specifies the source IP host for the policy. If you want the
policy to match on all source addresses, enter any.
The wildcard parameter specifies the portion of the source IP host address to match against. 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’s source address must
match the source-ip . Ones mean any value matches. For example, the source-ip and wildcard
values 10.157.22.26 0.0.0.255 mean that all hosts in the Class A subnet 10.157.22.x match the
policy.
If you prefer to specify the wildcard (mask value) in Classless Interdomain Routing (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 “10.157.22.26 0.0.0.255” as
“10.157.22.26/24”. 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 zeros. For example, if you specify 10.157.22.26/24 or 10.157.22.26
0.0.0.255, then save the changes to the startup-config file, the value appears as 10.157.22.0/24
(if you have enabled display of subnet lengths) or 10.157.22.0 0.0.0.255 in the startup-config file.