Source port: If the protocol in an IP packet is TCP or UDP, the packet can be filtered based Protocol: An IP packet can be filtered based on the protocol in the IP header of the packet. Packet based on the routing header contents, not on the destination address in Header, the stack performs IP filtering using the final destination address of the For IPv6 packets that contain a type 0 or type 2 routing Primary pieces of information that are gathered from the IP packet, commonlyĪn IP packet can be filtered based on the source address located in the IPĭestination address: An IP packet can be filtered based on the destination address located in the IP IP packets match IP filters based on a number of selection criteria. Has IPCONFIG6 IPSECURITY configured) and an active IP security policy, there On a z/OS stack that has IPCONFIG IPSECURITY configured (and perhaps also IpGenericFilterAction statement in an IP security policy configuration file. IP filter actions are configured using the When a packet matches one of the rules in the IP filter table, the policy determines what action is Security follows a default-deny policy by default, in the absence of any configured Rule: A z/OS Communications Server TCP/IP stack that is configured for IP In a default-deny environment, theĪbsence of any IP filter rules essentially isolates the system from the network. Necessary to allow only crucial network traffic.
Normally the rules would deny anything not explicitly permitted, aĬonfiguration known as a default-deny policy, in which rules are added as IP filter rules are configured using the IpFilterRule statement in an IP security policy configuration The matching IP filter rule is enforced by the TCP/IP stack. Table is consulted for each IP packet that is sent or received. When IP filtering is active on a host, the
The Internet Key Exchange (IKE) daemon works with the TCP/IP stack to provide IPSec support for IP filtering.Īn IP filter table is an ordered list of all IP filter rules. IP filtering matches a filter rule to data traffic based on any combination of IP source or destination address (or masked address), protocol, source or destination port, direction of flow, or time. The rule can be used to filter out unwanted packets from the network stream, while allowing others.
In other words, the set of properties that identify a packet, together with the action to be performed on it, is known as an IP filter rule. IP filters are rules defined to either discard or permit packets.
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