Jul 11, 2020 · iptables –A OUTPUT –p udp –o eth0 —dport 53 -j ACCEPT iptables –A INPUT –p udp –i eth0 portsport 53 -j ACCEPT Save IPTABLES changes service iptables save Use the following command to block port 80 for all but one IP (eg in incoming /sbin/iptables -A INPUT -p tcp -i eth1 -s ! --dport 80 -j DROP. Conclusion

allow windows shares through iptables in debian 9 - Unix however my lamp server needs to mount two windows shares from windows sever using CIFS like mount -t cifs -o user=user,rw // /share1 /var/share1 it worked just fine before setting up iptables, i tried to open tcp and udp ports 137 138 139 445 using iptables commandes NFTables To Replace iptables In the Linux Kernel - Slashdot Oct 19, 2013

[root@server ~]# iptables-save > iptables.dump [root@server ~]# cat iptables.dump # Generated by iptables-save v1.4.12 on Wed Dec 7 20:10:49 2011 *filter :INPUT DROP [45:2307] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [1571:4260654] -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A INPUT -p icmp -j ACCEPT -A INPUT -i lo -j ACCEPT -A INPUT

Dec 07, 2019 · Iptables is a great firewall included in the netfilter framework of Linux. A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. Configuring iptables manually is challenging for the uninitiated. Fortunately, there are many configuration tools available to assist: Apr 11, 2020 · Basic iptables howto. Iptables is a firewall, installed by default on all official Ubuntu distributions (Ubuntu, Kubuntu, Xubuntu). When you install Ubuntu, iptables is there, but it allows all traffic by default. Ubuntu comes with ufw - a program for managing the iptables firewall easily. Jun 16, 2020 · What is Iptables, and How Does It Work? Simply put, iptables is a firewall program for Linux.It will monitor traffic from and to your server using tables.These tables contain sets of rules, called chains, that will filter incoming and outgoing data packets. Iptables uses different kernel modules and different protocols so that user can take the best out of it. As for example, iptables is used for IPv4 ( IP version 4/32 bit ) and ip6tables for IPv6 ( IP version 6/64 bit ) for both tcp and udp. Normally, iptables rules are configured by System Administrator or System Analyst or IT Manager.

iptables is a user-space utility program that allows a system administrator to configure the tables provided by the Linux kernel firewall (implemented as different Netfilter modules) and the chains and rules it stores.

Working with iptables | Network World Iptables, more properly referred to as "iptables/netfilter" because of the two modules that are involved -- the userspace module "iptables" and the kernel module "netfilter" -- is the firewall