If you omit this option in a rule, matching the rule has no effect on the packet, but the counters on the rule increment. Jump: The jump specifies the target of the rule what action to take if the packet matches the rule. However, the more matches you use in a rule, the more memory the rule consumes. You can specify multiple matches in a single rule. Matches: The third argument is the match.Each table supports several different chains. Chain: The second argument is the chain. Table: The first argument is the table.You apply rules to chains, which attach to tables. Rules classify the traffic you want to control. Chains contain the individual rules to influence traffic. Mangle alters packets as they move through the switchĮach table has a set of default chains that modify or inspect packets at different points of the path through the switch.NAT applies Network Address Translation rules.Filter classifies traffic or filters traffic.When you build rules to affect the flow of traffic, tables can access the individual chains. POSTROUTING touches packets immediately before they leave the switch but after a routing decision.OUTPUT touches packets from the control plane software before they leave the switch.FORWARD touches transit traffic as it moves through the switch.INPUT touches packets after the switch determines that the packets are for the local system but before the control plane software receives them.PREROUTING touches packets before the switch routes them.The rules inspect or operate on packets at several points ( chains) in the life of the packet through the system: The iptables, ip6tables, and ebtables userspace applications provide syntax you use to define rules. Netfilter asserts policies at layer 2, 3 and 4 of the OSI model by inspecting packet and frame headers according to a list of rules. Netfilter does not require a separate software daemon to run it is part of the Linux kernel. Netfilter describes the way that the Linux kernel classifies and controls packets to, from, and across the switch. NVUE is a Cumulus Linux-specific userspace tool you can use to configure custom ACLs.In addition, cl-acltool programs rules in hardware for switch port interfaces, which iptables, ip6tables and ebtables cannot do on their own. cl-acltool operates on various configuration files and uses iptables, ip6tables, and ebtables to install rules into the kernel. cl-acltool is a Cumulus Linux-specific userspace tool you use to administer filtering rules and configure default ACLs.iptables, ip6tables, and ebtables are Linux userspace tools you use to administer filtering rules for IPv4 packets, IPv6 packets, and Ethernet frames (layer 2 using MAC addresses).You can use several different tools to configure ACLs in Cumulus Linux: Netfilter is the packet filtering framework in Cumulus Linux and other Linux distributions. If you are redirected to the main page of the user guide, then this page may have been renamed please search for it there. The current version of the documentation is available If you are using the current version of Cumulus Linux, the content on this page may not be up to date. Resource Diagnostics Using cl-resource-query.Simple Network Management Protocol - SNMP.Monitoring System Statistics and Network Traffic with sFlow.Monitoring Interfaces and Transceivers Using ethtool.Understanding the cl-support Output File.
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