![]() ![]() If you want to set up your machine as a NAT gateway, please look at #Setting up a NAT gateway. We pick these just to match the protocols we want handle with them in the later rules, which are specified with the protocol options, e.g. The chains can of course have arbitrary names. Creating necessary chainsįor this basic setup, we will create two user-defined chains that we will use to open up ports in the firewall. Also, rules have an associated runtime cost, so rules should not be reordered solely based upon empirical observations of the byte/packet counters. Of course there is a limit, depending on the logic that is being implemented. Note: Because iptables processes rules in linear order, from top to bottom within a chain, it is advised to put frequently-hit rules near the start of the chain. If there are rules, you may be able to reset the rules by loading a default rule set: ![]() ![]() Num pkts bytes target prot opt in out source destinationĬhain FORWARD (policy ACCEPT 0 packets, 0 bytes)Ĭhain OUTPUT (policy ACCEPT 82 packets, 8672 bytes) # iptables -nvL -line-numbers Chain INPUT (policy ACCEPT 156 packets, 12541 bytes) # iptables-save # Generated by iptables-save v1.4.19.1 on Thu Aug 1 19:28:53 2013 To check the current ruleset and verify that there are currently no rules run the following: This article assumes that there are currently no iptables rules set. All stock Arch Linux kernels have iptables support.įirst, install the userland utilities iptables or verify that they are already installed. Note: Your kernel needs to be compiled with iptables support.
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