Activate NAT on Debian etch and Disable IPv6 support on Debian

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Sep 102006
 

    Activate NAT on Debian etch

    What is NAT ?

    network address translation (NAT, also known as network masquerading or IP-masquerading) involves re-writing the source and/or destination addresses of IP packets as they pass through a router or firewall. Most systems using NAT do so in order to enable multiple hosts on a private network to access the Internet using a single public IP address (see gateway). According to specifications, routers should not act in this way, but many network administrators find NAT a convenient technique and use it widely. Nonetheless, NAT can introduce complications in communication between hosts.

    First, activate IP forwarding in /etc/sysctl.conf and add the following line

    # Enable packet forwarding
    net.ipv4.ip_forward = 1

    If you have already this line just uncomment

    Now you need to restart your networking services using the following command

    #/etc/init.d/networking restart

    Now you need to activate NAT itself in /etc/network/interfaces
    auto eth0
    iface eth0 inet static
    address 192.168.1.254
    netmask 255.255.255.0
    network 192.168.1.255
    up iptables -t nat -A POSTROUTING -o $IFACE -j MASQUERADE

    Now you need to restart your networking services using the following command

    #/etc/init.d/networking restart

    Disable IPv6 support on Debian

    IPv6 is still not widely accepted and even less used. Many networked applications in Debian are enabling IPv6 support anyway, which result in a drop in performance and longer delays in day-to-day use.

    To disallow ipv6 kernel module autoloading, deactivate it in modutils or module-init-tools in /etc/modprobe.d/aliases.

    To disable IPv6 name resolution in Firefox or other Gecko-based browsers, change the following option to true

    network.dns.disableIPv6

    If you are interested in debian IPV6 Project check here

    Related content:

    1. How to disable IPV6 in debian
    2. Ubuntu Networking for Basic and Advanced Users
    3. Debian Networking for Basic and Advanced Users
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    5. Create a LAN for Virtual Servers with KVM and VDE

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       Posted by at 9:50 am
      • Michael G

        auto eth0
        iface eth0 inet static
        address 192.168.1.254
        netmask 255.255.255.0
        network 192.168.1.255
        up iptables -t nat -A POSTROUTING -o $IFACE -j MASQUERADE

        Probably a silly thing, but is not the network line here mixed up with the broadcast address? Should it not say something like this:

        broadcast 192.168.1.255
        network 192.168.1.0

      • kajax

        Yes, obviously! You are absolutely right!

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