Contents
What is input and output in iptables?
INPUT: packets coming from the network and going to your server. OUTPUT: packets originating from your server and going to the network. FORWARD: packets forwarded by your server, if/when it acts as a router between different networks.
What is Dport and sport in iptables?
TCP Protocol. These match options are available for the TCP protocol (-p tcp): –dport — Sets the destination port for the packet. –sport — Sets the source port of the packet using the same options as –dport.
What does Dport mean?
DPORT
| Acronym | Definition |
|---|---|
| DPORT | Destination Port |
What does Prot opt in out do in iptables?
What it will do is output its default rules: Chain INPUT (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination
What’s the difference between drop and accept in iptables?
ACCEPT – will allow the packet to pass through. DROP – will not let the packet pass through. RETURN – stops the packet from traversing through a chain and tell it to go back to the previous chain. In this iptables tutorial, we are going to work with one of the default tables, called filter.
What happens when packet matches a rule in iptables?
When a packet matches a rule, it is given a target, which can be another chain or one of these special values: ACCEPT – will allow the packet to pass through. DROP – will not let the packet pass through. RETURN – stops the packet from traversing through a chain and tell it to go back to the previous chain.
What are the chains in the iptables table?
RETURN – stops the packet from traversing through a chain and tell it to go back to the previous chain. In this iptables tutorial, we are going to work with one of the default tables, called filter. It consists of three chains: INPUT – controls incoming packets to the server. FORWARD – filters incoming packets that will be forwarded somewhere else.