May 05, 2017
Jan 29, 2018 Chapter 14. iptables firewall #!/bin/bash # first cleanup everything iptables -t filter -F iptables -t filter -X iptables -t nat -F iptables -t nat -X # default drop iptables -P INPUT DROP iptables -P FORWARD DROP iptables -P OUTPUT DROP # allow loopback device iptables -A INPUT -i lo -j ACCEPT iptables -A OUTPUT -o lo -j ACCEPT # allow ssh over eth0 from outside to system Iptables - MineOS Wiki
Also remember, that you redirect from port 80 to 8080, so 8080 should be still open and is functional as before. Redirecting incoming traffic. All you need is this single rule: iptables -t nat -I PREROUTING --src 0/0 --dst 127.0.0.1 -p tcp --dport 80 -j REDIRECT --to-ports 8080
"IPTABLES DENY OUTPUT ""IPTABLES DENY FORWARD "We use this prefix policy in the examples below. iptables sample rules script. This is a script that implements an iptables policy example where the outbound traffic is allowed and incoming traffic is denied (excepting SSH and PING). The script uses the log-prefix option to apply the prefixes that
iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j DNAT \ --to 172.31.0.23:80. This rule specifies that the NAT table use the built-in PREROUTING chain to forward incoming HTTP requests exclusively to the listed destination IP address of 172.31.0.23.
Feb 01, 2010 · So, in your case, any packet going to port 80 is redirected to port 8080 (iptables -t nat -I PREROUTING -p tcp –dport 80 -j REDIRECT –to-ports 8080) and then it is filtered by the default DROP policy of the INPUT chain, which I assume you are using, in fact it doesn’t match the ACCEPT rule on port 80 (iptables -I INPUT -p tcp –dport 80 -j ACCEPT). Apr 13, 2010 · H ow do I forward multiple ports using Linux iptables based firewall? 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. Sep 06, 2015 · iptables -A FORWARD -d 2.2.2.2 -i venet0 -p tcp -m tcp --dport 80:90 -j ACCEPT If you want to forward a single port, simply replace the port range above with a single port. To forward UDP instead, replace instances of "tcp" above with "udp". Oct 01, 2012 · Simple Port Forwarding This can be helpful if you want a particular service available on different ports internally and externally for the same host. For example, you may want Apache httpd available on your internal network at port 80, but externally on some obscure port for a host that is directly connected to both networks. iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j DNAT \ --to 172.31.0.23:80. This rule specifies that the NAT table use the built-in PREROUTING chain to forward incoming HTTP requests exclusively to the listed destination IP address of 172.31.0.23. iptables -A FORWARD -i eth0 -p tcp --dport 80 -d 172.31.0.23 -j ACCEPT This rule allows forwarding of incoming HTTP requests from the firewall to its intended destination of the Apache HTTP Server server behind the