Dec 28, 2019 · # iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 80 -j DNAT --to 192.168.1.2:8080 # iptables -A FORWARD -p tcp -d 192.168.1.2 --dport 8080 -j ACCEPT These two rules are straight forward. The first one specifies that all incoming tcp connections to port 80 should be sent to port 8080 of the internal machine 192.168.1.2. Dec 19, 2011 · The problem with that setup is that iptables does not seem to accept a virtual designation for a NIC in its statements. eth0 is acceptable but eth0:1 is not. Therefore I had no choice but to install another NIC on the WAN side and designate it eth2. Sep 26, 2018 · Block Connections to a Network Interface iptables -A INPUT -i eth0 -s 192.168.252.10 -j DROP; Block Connections to a Network Interface iptables -A INPUT -i eth0 -s 192.168.252.10 -j DROP; Allow All Incoming SSH iptables -A INPUT -p tcp –dport 22 -m conntrack –ctstate NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -p tcp –sport 22 -m iptables -A INPUT -m statistic --mode random --probability 0.01 -j DROP Above will drop an incoming packet with a 1% probability. Be careful, anything above about 0.14 and most of you tcp connections will most likely stall completely. Take a look at man iptables and search for "statistic" for more information. $> iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT $> iptables -A INPUT -m state --state NEW -i ! eth0 -j ACCEPT $> iptables -P INPUT DROP #only if the first two are succesful $> iptables -A FORWARD -i eth0 -o eth0 -j REJECT Jun 16, 2020 · To do this, you need to insert the -A option (Append) right after the iptables command, like so: sudo iptables -A. It will alert iptables that you are adding new rules to a chain. Then, you can combine the command with other options, such as:-i (interface) — the network interface whose traffic you want to filter, such as eth0, lo, ppp0, etc.
Dec 28, 2019 · # iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 80 -j DNAT --to 192.168.1.2:8080 # iptables -A FORWARD -p tcp -d 192.168.1.2 --dport 8080 -j ACCEPT These two rules are straight forward. The first one specifies that all incoming tcp connections to port 80 should be sent to port 8080 of the internal machine 192.168.1.2.
# iptables -A INPUT -i eth0 -p tcp --dport 22 -j ACCEPT. 4. List iptables to verify newly added rule. # iptables -L Chain INPUT (policy ACCEPT) target prot opt source sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE sudo iptables -A FORWARD -i eth0 -o wlan0 -m state --state RELATED,ESTABLISHED -j ACCEPT sudo iptables -A FORWARD -i wlan0 -o eth0 -j ACCEPT Now I want to set up the same rules except use interface tun0-00 and forward all my traffic through my vpn tunnel. @CristiDiaconescu Bringing the network down and up can be down with ifconfig eth0 down; ifconfig eth0 up.Use iptables -nL to find your current rule set.iptables -F removes all rules, but keep in mind that the default policy of a chain may be set to DROP.
Jan 24, 2011 · Q1: Rule the matches ssh traffic(tcp,22) arriving through interface eth0. ans. iptables -A INPUT -i eth0 -p tcp –dport 22 OR iptables -A INPUT -i eth0 -p tcp –sport 22 Q2: Rule that matches traffic to a DNS server (udp,53) from any address in the range 10.0.0.0-10.0.0.255
sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE sudo iptables -A FORWARD -i eth0 -o wlan0 -m state --state RELATED,ESTABLISHED -j ACCEPT sudo iptables -A FORWARD -i wlan0 -o eth0 -j ACCEPT Now I want to set up the same rules except use interface tun0-00 and forward all my traffic through my vpn tunnel. @CristiDiaconescu Bringing the network down and up can be down with ifconfig eth0 down; ifconfig eth0 up.Use iptables -nL to find your current rule set.iptables -F removes all rules, but keep in mind that the default policy of a chain may be set to DROP.