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<!DOCTYPE html>
<html dir="ltr" lang="en">
    <head>
        <meta charset='utf-8'>
        <title>2. Network</title>
    </head>
    <body>
        <a href="index.html">Core OS Index</a>

        <h1>2. Network</h1>

        <p>Operation of the network can be handle with init scripts;</p>

        <dl>
            <dt><a href="conf/rc.d/iptables">/etc/rc.d/iptables</a></dt>
            <dd>Configure iptables, start option loads set of rules from
            file /etc/iptables/rules_file_name, open option allows everything
            to outside and blocks everything from outside, stop will block
            and log everything.</dd>
            <dt><a href="conf/rc.d/net">/etc/rc.d/net</a></dt>
            <dd>Configure Ethernet interface with static or dynamic (dhcp)
            IP, set default route and add default gateway.</dd>
            <dt><a href="conf/rc.d/wlan">/etc/rc.d/wlan</a></dt>
            <dd>Configure Wireless interface, launch wpa_supplicant to handle
            wireless authenticationand dynamic (dhcp)
            connection to router and add as default gateway.</dd>
        </dl>

        <p>Choose wireless or net as connection to outside world and configure
        <a href="conf/rc.conf">/etc/rc.conf</a> to run at startup, example
        connecting using wireless interface;</p>

        <pre>
        #
        # /etc/rc.conf: system configuration
        #

        FONT=default
        KEYMAP=dvorak
        TIMEZONE="Europe/Lisbon"
        HOSTNAME=c9
        SYSLOG=sysklogd
        SERVICES=(lo iptables wlan crond)

        # End of file
        </pre>

        <p>If is first boot after install configure iptables and one of above
        described scripts then proceed to
        <a href="package.html#sysup">update system.</a></p>

        <h2 id="resolv">2.2.1. Resolver</h2>

        <p>This example will use
        <a href="http://www.chaoscomputerclub.de/en/censorship/dns-howto">Chaos Computer Club</a>
        server, edit /etc/resolv.conf and make it immutable;</p>

        <pre>
        # /etc/resolv.conf.head can replace this line
        nameserver 213.73.91.35
        # /etc/resolv.conf.tail can replace this line
        </pre>

        <pre>
        # chattr +i /etc/resolv.conf
        </pre>

        <h2 id="static">2.2.2. Static IP</h2>

        <p>Current example of <a href="conf/rc.d/net">/etc/rc.d/net</a>;</p>

        <pre>
        Address:   192.168.0.1           11000000.10101000.00000000 .00000001
        Netmask:   255.255.255.0 = 24    11111111.11111111.11111111 .00000000
        Wildcard:  0.0.0.255             00000000.00000000.00000000 .11111111
        =>
        Network:   192.168.0.0/24        11000000.10101000.00000000 .00000000 (Class C)
        Broadcast: 192.168.0.255         11000000.10101000.00000000 .11111111
        HostMin:   192.168.0.1           11000000.10101000.00000000 .00000001
        HostMax:   192.168.0.254         11000000.10101000.00000000 .11111110
        Hosts/Net: 254                   (Private Internet)
        </pre>

        <p>Other IP class that can used for private network;</p>

        <pre>
        Address:   10.0.0.1              00001010.00000000.00000000 .00000001
        Netmask:   255.255.255.0 = 24    11111111.11111111.11111111 .00000000
        Wildcard:  0.0.0.255             00000000.00000000.00000000 .11111111
        =>
        Network:   10.0.0.0/24           00001010.00000000.00000000 .00000000 (Class A)
        Broadcast: 10.0.0.255            00001010.00000000.00000000 .11111111
        HostMin:   10.0.0.1              00001010.00000000.00000000 .00000001
        HostMax:   10.0.0.254            00001010.00000000.00000000 .11111110
        Hosts/Net: 254                   (Private Internet)
        </pre>

        <p>Manual configuring like net script;</p>

        <pre>
        # DEV=enp8s0
        # ADDR=192.168.1.9
        # MASK=24
        # GW=192.168.1.254
        </pre>

        <pre>
        # ip addr flush dev ${DEV}
        # ip route flush dev ${DEV}
        # ip addr add ${ADDR}/${MASK} dev ${DEV} broadcast +
        # ip link set ${DEV} up
        # ip route add default via ${GW}
        </pre>

        <h2 id="iptables">2.2.3. Iptables</h2>

        <p>For more information about iptables read
        <a href="https://wiki.archlinux.org/index.php/Iptables">arch wiki</a>.
        You can use
        <a href="conf/iptables/rules.v4">/etc/iptables/rules.v4</a>
        as template, replace interface by the one facing the router/gateway.
        This configuration file is used at boot time by iptables-restore command,
        if you use a script or change the rules of running system you can
        use iptables-save command to save configuration to a file.</p>

        <pre>
        # mkdir /etc/iptables
        # cp c9-doc/core/conf/iptables/rules.v4 /etc/iptables/
        # cp c9-doc/core/conf/rc.d/iptables /etc/rc.d/
        # chmod +x /etc/rc.d/iptables
        </pre>

        <p>Adjust rules.v4 to your needs, then;</p>

        <pre>
        # sh /etc/rc.d/iptables start
        </pre>

        <p>Copy init script, edit if you dont like to
        let drop when you call stop.</p>

        <p>Re-configure your rc.conf and add iptables before (w)lan is up;</p>

        <pre>
        SERVICES=(lo iptables net crond)
        </pre>

        <p>

        <h2 id="wpa">2.2.4. Wpa and dhcpd</h2>

        <p>There is more information on
        <a href="http://crux.nu/Wiki/WifiStartScripts">Wiki Wifi Start Scripts</a> and
        see <a href="conf/rc.d/wlan">/etc/rc.d/wlan</a>. Manual or first time configuration;</p>

        <pre>
        # ip link
        </pre>

        <pre>
        # iwlist wlp2s0 scan
        </pre>

        <pre>
        # iwconfig wlp2s0 essid NAME key s:ABCDE12345
        </pre>

        <h3>2.2.4.1. Wpa Supplicant</h3>

        <p>Configure wpa supplicant edit;</p>

        <pre>
        # vim /etc/wpa_supplicant.conf
        </pre>

        <pre>
        ctrl_interface=/var/run/wpa_supplicant
        update_config=1
        fast_reauth=1
        ap_scan=1
        </pre>

        <pre>
        # wpa_passphrase &lt;ssid&gt; &lt;password&gt; &gt;&gt; /etc/wpa_supplicant.conf
        </pre>

        <p>Now start wpa_supplicant with:</p>

        <pre>
        # wpa_supplicant -B -i wlp2s0 -c /etc/wpa_supplicant.conf
        Successfully initialized wpa_supplicant
        </pre>

        <p>Use <a href="conf/rc.d/wlan">/etc/rc.d/wlan</a>
        init script to auto load wpa configuration and dhcp
        client.</p>

        <h3>2.2.4.2. Wpa Cli</h3>

        <pre>
        # wpa_cli
        &gt; status
        </pre>

        <pre>
        &gt; add_network
        3
        </pre>

        <pre>
        &gt; set_network 3 ssid "Crux-Network"
        OK
        </pre>

        <pre>
        &gt; set_network 3 psk "uber-secret-pass"
        OK
        </pre>

        <pre>
        &gt; enable_network 3
        OK
        </pre>

        <pre>
        &gt; list_networks
        </pre>

        <pre>
        &gt; select_network 3
        </pre>

        <pre>
        &gt; save_config
        </pre>


        <a href="index.html">Core OS Index</a>
        <p>
        This is part of the c9-doc Manual.
        Copyright (C) 2017
        c9 team.
        See the file <a href="../fdl-1.3-standalone.html">Gnu Free Documentation License</a>
        for copying conditions.</p>

    </body>
</html>