Iptables: blocking SAMBA traffic, but allowing from specific MAC addresses. My god, it took me hours to configure the following setup.
I want to block SAMBA traffic to all other clients, but allow them from specific hosts by MAC address: 1/ I keep the INPUT chain to policy ACCEPT 2/ I allow traffic on specific MAC address 3/ I deny all other traffic. Iptables MAC Address Filtering. LAN or wireless access can be filtered by using the MAC addresses of the devices transmitting within your network.
A mac address is acronym for media access control address, is a unique address assigned to almost all-networking hardware such as Ethernet cards, routers, mobile phones, wireless cards and so on (see mac address at wikipedia for more information). This quick tutorial explains how to block or deny access using MAC address using iptables - Linux administration tool for IPv4 packet filtering and NAT. Linux Iptables comes with the MAC module. This module matches packets traveling through the firewall based on their MAC (Ethernet hardware) address. It offers good protection against malicious users who spoof or change their IP address.
Examples: Access Restrictions Using MAC Address Drop all connection coming from mac address 00:0F:EA:91:04:08 (add the following command to your firewall script): Linux Howtos: Security -> iptables-tutorial. This chapter is aimed at getting you started and to help you understand the role Netfilter and iptables play in Linux today.
This chapter should hopefully get you set up and finished to go with your experimentation, and installation of your firewall. Given time and perseverance, you'll then get it to perform exactly as you want it to. The iptables user-space package can be downloaded from the - The official Netfilter Frequently Asked Questions . Also a good place to start at when wondering what iptables and Netfilter is about. . The iptables package also makes use of kernel space facilities which can be configured into the kernel during make configure . To run the pure basics of iptables you need to configure the following options into the kernel while doing make config or one of its related commands: CONFIG_PACKET - This option allows applications and utilities that needs to work directly to various network devices.
Note. Ubuntu: How to add an iptables rule that UFW can't create. IP Packet Filtering: iptables Explained For Beginners. Iptables is a IP Filter which is shipped with kernel.
Technically speaking, an IP filter will work on Network layer in TCP/IP stack but actually iptables work on data link and transport layer as well. In a broad sense, iptables consists on tables, which consists of chain which is further comprised of rules. Default tables are: RawMangleNATFilter. A near perfect iptables firewall configuration. Introduction to the iptables firewall A firewall in IT terms is a software or hardware solution which tries to block as much as possible evil network traffic, while allowing usefull traffic.
Firewalls can be either implemented in existing network devices like routers, as separate devices with the sole function to protect a network or in the first layers of the networking stack on a networked computer. Important Firewalls can be very effective in blocking undesirable traffic to your computer or network. This page describes a way to implement a firewall in the kernel of your computer. MySecureShell - Sécurité. 42.9. IPTables, explications détaillés. Included with Red Hat Enterprise Linux are advanced tools for network packet filtering — the process of controlling network packets as they enter, move through, and exit the network stack within the kernel.
Kernel versions prior to 2.4 relied on ipchains for packet filtering and used lists of rules applied to packets at each step of the filtering process. The 2.4 kernel introduced iptables (also called netfilter), which is similar to ipchains but greatly expands the scope and control available for filtering network packets. This chapter focuses on packet filtering basics, defines the differences between ipchains and iptables, explains various options available with iptables commands, and explains how filtering rules can be preserved between system reboots. Refer to Section 42.9.7, “Additional Resources” for instructions on how to construct iptables rules and setting up a firewall based on these rules. Warning The functionality of ipchains is not affected by these errors. Note.