iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j DNAT \ --to-destination 10.0.4.2:80 With this command, all HTTP connections to port 80 from the outside of the LAN are routed to the HTTP server on a separate network from the rest of the internal network.
#ip ro add 10.1.1.0/24 via 2.0.0.2 iptables -A PREROUTING -t mangle -m mac --mac-source aa:aa:aa:aa:aa:aa -j MARK --set-mark 1 iptables -A PREROUTING -t mangle -j CONNMARK --save-mark iptables -A POSTROUTING -t mangle -j CONNMARK --restore-mark ebtables -t nat -A OUTPUT -p ipv4 --ip-proto tcp --mark 1 -j dnat --to-destination aa:aa:aa:aa:aa:aa iptables -t nat -A POSTROUTING -o eth3 -j Linux brouting, MAC snat and MAC dnat all in one This setup and explanation was given by Enrico Ansaloni, who got things working together with Alessandro Eusebi.. Short description. Two 802.1Q VLANs, a HP 4000 M switch and a Linux bridge with iptables and ebtables. The HP switch is used for VLAN switching. 7.4.1. DMZs and iptables - MIT iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j DNAT \ --to-destination 10.0.4.2:80 With this command, all HTTP connections to port 80 from the outside of the LAN are routed to the HTTP server on a separate network from the rest of the internal network. [root@real-server]# iptables -t nat -A PREROUTING -p tcp -d 10.10.20.99 --dport 80 -j DNAT --to-destination 10.10.14.2 Full network address translation, as performed with iproute2 can be simulated with both netfilter SNAT and DNAT, with the potential benefit (and attendent resource consumption) of connection tracking. Feb 18, 2020 · sudo iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 443 -j DNAT --to-destination 10.147.164.8:443 To remove prerouting command, run: sudo iptables -t nat -D PREROUTING -i eth0 -p tcp --dport 443 -j DNAT --to-destination 10.147.164.8:443 Make sure you save updated firewall rules, either modifying your shell scripts or by running iptables
Iptables REDIRECT vs. DNAT vs. TPROXY – What I've learned
iptables에는 테이블의 하위 규칙 속성으로서 체인(Chain) 이라는 것이 존재한다. nat에는 아래의 체인을 사용해 규칙을 정의할 수 있다. PREROUTING (DNAT) : 패킷의 도착지(deatination) 주소를 변경한다. D(estination)NAT iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j DNAT \ --to 172.31.0.23:80 Cette règle spécifie que la table NAT utilise la chaîne intégrée PREROUTING pour retransmettre les requêtes HTTP entrantes exclusivement à l'adresse IP de destination listée de 172.31.0.23. $ iptables -t nat -A PREROUTING -d @pub -i eth0 -j DNAT --to-destination @priv Let's modify the table nat, append a rule to the pretrouting section : something is trying to reach @pub ? Let's put it in our input interface eth0, jump to the Destination Nat protocol, which tells us to send the packet to @priv. Feb 28, 2019 · We need to insert an entry in PREROUTING chain of iptables with DNAT target. Command will be as follows – # iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 80 -j DNAT --to 172.31.40.29:8080 # iptables -A FORWARD -p tcp -d 172.31.40.29 --dport 8080 -j ACCEPT Change interface, IP and ports as per your requirement.
#ip ro add 10.1.1.0/24 via 2.0.0.2 iptables -A PREROUTING -t mangle -m mac --mac-source aa:aa:aa:aa:aa:aa -j MARK --set-mark 1 iptables -A PREROUTING -t mangle -j CONNMARK --save-mark iptables -A POSTROUTING -t mangle -j CONNMARK --restore-mark ebtables -t nat -A OUTPUT -p ipv4 --ip-proto tcp --mark 1 -j dnat --to-destination aa:aa:aa:aa:aa:aa iptables -t nat -A POSTROUTING -o eth3 -j
IPTABLES nat PREROUTING does not work on localhost IPTABLES PREROUTING doesn't work on localhost? This happens because PREROUTING isn't used by the loopback interface, you might need to add an OUTPUT rule. Just wasted two hours thinking iptables was broken because DNAT doesn’t work from the localhost. Post navigation. Iptables REDIRECT vs. DNAT vs. TPROXY – What I've learned