How do I allow multiple ports in iptables?

How do I allow multiple ports in iptables?

How to Open Multiple ports in IPtables firewall

1. Log into your Linux server via SSH as root user.
2. Run the command “iptables -A INPUT -p tcp -m multiport –dports 25,465,110,143,993,995 -j ACCEPT” to allow multiple ports.
3. You must save the IPtables rules by running the command “service iptables save”

How do I port forward multiple ports?

Creating the 1st Rule

1. Navigate to Security>Zone Firewall> Port Forward and Proxy.
2. Click “Add” underneath Port Forward Rules.
3. Name the rule.
4. Put in 3389 -> 3389 for the Internet Ports.
5. Put in the IP of the computer you want the first rule to forward RDP traffic to.
6. Put in Put in 3389 -> 3389 for the Local Ports.

What is iptables multiport?

The Linux iptables comes with MATCH EXTENSIONS which can use extended packet matching modules. The multiport match module matches a set of source or destination ports. Up to 15 ports can be specified. A port range (port:port) counts as two ports. It can only be used in conjunction with -p tcp or -p udp options.

How do I block multiple ports?

1. Click “Start | Control Panel | System and Security | Windows Firewall.”
2. Select “Advanced Settings.” Click “Inbound Rules” to block an inbound port; click “Outbound Rules” to block an outbound port.
3. Select “New Rule.” Choose “Port” from the options and then click “Next.”

How do I enable IP range in iptables?

Linux Iptables: How to specify a range of IP addresses or ports

1. Iptables set range of IP addresses. You need to use following options with match extensions (-m Ext).
2. Syntax: -m iprange –src-range IP-IP -j ACTION.
3. Port range.
4. NAT table – range option.

Can ssh listen on multiple ports?

SSH is by default configured to listen to port 22 and only on port 22. You can configure your SSH server to run on other ports, and extending the same method allows you to configure your SSH server to run on more than one port.

What is the maximum port number?

65,535
The highest TCP port number is 65,535. The TCP protocol provides 16 bits for the port number, and this is interpreted as an unsigned integer; all values are valid, apart from 0, and so the largest port number is (2^16 – 1) or 65,535.

How to change port number in iptables port forwarding?

#iptables -t nat -A PREROUTING -s 192.168.10.0/24 -p tcp –destination-port 80 Redirect –to-port 10000 As the server on internet listens to port 80 or 443, after altering the port number will it change the packet header to port 10000, if so server will not be able to respond for the port number it receives.

Is there a limit to the number of ports in an iptable?

Iptables setting multiple multiports in one rule. The multiport extension has a limit (15) for the ports that can be specified.

How does forward chain work in iptables systutorials?

After research about PREROUTING and FORWARD chain in iptables,This is what I realized: FORWARD chain is after PREROUTING chain. Ports are translated to the destination port, in PREROUTING chain by NAT, therefore In FORWARD chain there is no traffic with the port(80) and all traffic translated to port(8080).

What happens when a packet passes through iptables?

When a packet passes through Iptables, it passes a set of chains. Decisions made by those chains are called rules and that’s basically how you configure Iptables. For our setup to work, we need to add a DNAT and SNAT rule (Prerouting and Postrouting).