Apr 28, 2011 · iptables -I INPUT 1 -j LOG. make sure to use -I instead of -A because this rule should be executed first before checking the other rules so 1 is used to place the rule first. Similarly you can execute the same command for other chains. FORWARD chain. iptables -I FORWARD 1 -j LOG. OUTPUT chain. iptables -I OUTPUT 1 -j LOG
Dec 05, 2008 · While doing a server migration, it happens that some traffic still go to the old machine because the DNS servers are not yet synced or simply because some people are using the IP address instead of the domain name…. By using iptables and its masquerade feature, it is possible to forward all traffic to the old server to the new IP. If you want to redirect DNS quries you can try this. iptables -t nat -A PREROUTING -i ethX -p udp --dport 53 -j DNAT --to $(get lan_ipaddr) iptables -t nat -A PREROUTING -i ethX -p tcp --dport 53 -j DNAT --to $(get lan_ipaddr) iptables -t nat -L -v -n # shows nat table and if you try to forward port 80 to another ip. Here is the rule and a Jul 13, 2005 · The domain name service provided by BIND (named) software. It uses both UDP and TCP protocol and listen on port 53. DNS queries less than 512 bytes are transferred using UDP protocol and large queries are handled by TCP protocol such as zone transfer. ADVERTISEMENTS i) named/bind server – TCP/UDP port 53 ii)Client (browser, dig … Continue reading "Linux Iptables block or open DNS Pour le DNS, c'est le port 53. Ensuite, je ne me souviens plus si il faut mettre IN, OUT ou IN/OUT J'te poste ma config' iptables que j'utilise pour mon firewall en espérant que ça puisse te servir : Jul 22, 2020 · iptable rules to allow outgoing DNS lookups, outgoing icmp (ping) requests, outgoing connections to configured package servers, outgoing connections to all ips on port 22, all incoming connections to port 22, 80 and 443 and everything on localhost - iptables.sh iptables -t nat -A PREROUTING -p tcp -i ppp0 --dport 8001 -j DNAT --to-destination 192.168.1.200:8080 iptables -A FORWARD -p tcp -d 192.168.1.200 --dport 8080 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT Both rules are applied only to TCP traffic (if you want to alter UDP as well, you need to provide similar rules but with -p udp option set). The iptables method is suited for situations where an external DNS service is already running in your infrastructure and is used as the recursor or if you want to use an existing DNS server as your query endpoint and forward requests for the consul domain to the Consul server.
iptables Syntax | iptables: The Linux Firewall
Operating Systems Linux Red Hat iptables & port 53 (DNS) # 1 Duffs22. Registered User. 113, 1. 41.181.59.120/29 209.212.96.1 state NEW udp dpt:53 Chain FORWARD
iptable rules to allow outgoing DNS lookups, outgoing icmp
If you want to redirect DNS quries you can try this. iptables -t nat -A PREROUTING -i ethX -p udp --dport 53 -j DNAT --to $(get lan_ipaddr) iptables -t nat -A PREROUTING -i ethX -p tcp --dport 53 -j DNAT --to $(get lan_ipaddr) iptables -t nat -L -v -n # shows nat table and if you try to forward port 80 to another ip. Here is the rule and a Jul 13, 2005 · The domain name service provided by BIND (named) software. It uses both UDP and TCP protocol and listen on port 53. DNS queries less than 512 bytes are transferred using UDP protocol and large queries are handled by TCP protocol such as zone transfer. ADVERTISEMENTS i) named/bind server – TCP/UDP port 53 ii)Client (browser, dig … Continue reading "Linux Iptables block or open DNS