Jan 29, 2018 · sudo iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 2200 -j DNAT --to-destination 10.0.3.21:22 If you successfully login to your server by using SSH, a persistent connection will be created (i.e. no new connections even if you are connected for more than 1 hour). If you fail and try to login again, a new connection will be created.
Example of iptables NAT¶. If using Red Hat Enterprise Linux (or Fedora), install iptables and save the rules below as /etc/sysconfig/iptables. # yum install iptables-services # service iptables enable iptables Syntax | iptables: The Linux Firewall A bar or pipe symbol separates alternate syntax options. For example, most of the iptables commands have both a short and a long form, such as -L and --list, and so they would be listed as alternate options because you would use one or the other of -L or --list.
iptables/ebtables/bridge-utils: PREROUTING/FORWARD to
IPTables - DNAT, SNAT, port forwarding
Quick-Tip: Linux NAT in Four Steps using iptables # /sbin/iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE # /sbin/iptables -A FORWARD -i eth0 -o eth1 -m state --state RELATED,ESTABLISHED -j ACCEPT # /sbin/iptables -A FORWARD -i eth1 -o eth0 -j ACCEPT You should now be NATing. You can test this by pinging an external address from one of your internal hosts. The last step is to ensure that Examples | Netfilter and NAT | InformIT Examples. Let's look at some examples of using masquerading, snat, and dnat. Let's first assume the following: Your IP is dynamically assigned by your ISP. You want to allow your entire Class C network of 192.168.50.0/24 access to the Web. To implement these, we'll need to specify the NAT table. iptables/ebtables/bridge-utils: PREROUTING/FORWARD to