HP 7000 dl Router manual Config#interface hdlc Config-hdlc1#access-policy UnTrusted

SROS Command Line Interface Reference Guide HDLC Command Set

(config-policy-class)#permit list InWeb

Associate the access list with the interface:

(config)#interface hdlc 1

(config-hdlc1)#access-policy UnTrusted

Technology Review

Creating access policies and lists to regulate traffic through the routed network is a four-step process: Step 1:

Enable the security features of the SROS using the ip firewall command.

Step 2:

Create an access list to permit or deny specified traffic. Standard access lists provide pattern matching for source IP addresses only. (Use extended access lists for more flexible pattern matching.) IP addresses can be expressed in one of three ways:

1.Using the keyword any to match any IP address. For example, entering deny any will effectively shut down the interface that uses the access list because all traffic will match the any keyword.

2.Using the host <A.B.C.D> to specify a single host address. For example, entering permit 196.173.22.253 will allow all traffic from the host with an IP address of 196.173.22.253.

3.Using the <A.B.C.D> <wildcard> format to match all IP addresses in a “range”. Wildcard masks work in reverse logic from subnet mask. Specifying a one in the wildcard mask equates to a “don’t care”. For example, entering deny 192.168.0.0 0.0.0.255 will deny all traffic from the 192.168.0.0/24 network.

Step 3:

Create an access policy that uses a configured access list. SROS access policies are used to permit, deny, or manipulate (using NAT) data for each physical interface. Each ACP consists of a selector (access list) and an action (allow, discard, NAT). When packets are received on an interface, the configured ACPs are applied to determine whether the data will be processed or discarded. Possible actions performed by the access policy are as follows:

allow list <access list names>

All packets passed by the access list(s) entered will be allowed to enter the router system.

discard list <access list names>

All packets passed by the access list(s) entered will be dropped from the router system.

allow list <access list names> policy <access policy name>

All packets passed by the access list(s) entered and destined for the interface using the access policy listed will be permitted to enter the router system. This allows for configurations to permit packets to a single interface and not the entire system.

discard list <access list names> policy <access policy name>

All packets passed by the access list(s) entered and destined for the interface using the access policy listed will be blocked from the router system. This allows for configurations to deny packets on a specified interface.

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