Installation and Getting Started Guide
The commands in this example configure an ACL to deny packets from three source IP addresses from being forwarded on port 1/1. The last ACL entry in this ACL permits all packets that are not explicitly denied by the first three ACL entries.
Standard ACL Syntax
Syntax: [no] access-list <num> deny permit <source-ip> <hostname> <wildcard> [log]
or
Syntax: [no] access-list <num> deny permit <source-ip>/<mask-bits> <hostname> [log]
Syntax: [no] access-list <num> deny permit host <source-ip> <hostname> [log]
Syntax: [no] access-list <num> deny permit any [log]
Syntax: [no] ip access-group <num> in out
The <num> parameter is the access list number and can be from 1 – 99.
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 HP device’s DNS resolver. 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 a four-part value in dotted-decimal notation (IP address format) consisting of ones and zeros. 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 209.157.22.26 0.0.0.255 mean that all hosts in the Class C sub-net 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 sub-net lengths) or 209.157.22.0 0.0.0.255 in the startup-config file.
If you enable the software to display IP sub-net 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-lengthcommand 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 sub-net mask in the display produced by the
show access-list and show ip access-list commands.
The host <source-ip> <hostname> parameter lets you specify a host IP address or name. When you use this parameter, you do not need to specify the mask. A mask of all zeros (0.0.0.0) is implied.
The any parameter configures the policy to match on all host addresses.
The log argument configures the device to generate Syslog entries and SNMP traps for packets that are denied by the access policy.
