shorewall_code/Shorewall-docs2/kernel.xml

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  <!--$Id$-->

  <articleinfo>
    <title>Kernel Configuration</title>

    <authorgroup>
      <author>
        <firstname>Tom</firstname>

        <surname>Eastep</surname>
      </author>
    </authorgroup>

    <pubdate>2004-11-01</pubdate>

    <copyright>
      <year>2001-2004</year>

      <holder>Thomas M. Eastep</holder>
    </copyright>

    <legalnotice>
      <para>Permission is granted to copy, distribute and/or modify this
      document under the terms of the GNU Free Documentation License, Version
      1.2 or any later version published by the Free Software Foundation; with
      no Invariant Sections, with no Front-Cover, and with no Back-Cover
      Texts. A copy of the license is included in the section entitled
      <quote><ulink url="GnuCopyright.htm">GNU Free Documentation
      License</ulink></quote>.</para>
    </legalnotice>
  </articleinfo>

  <note>
    <para>For information regarding configuring and building GNU/Linux
    kernels, see <ulink
    url="http://www.kernelnewbies.org">http://www.kernelnewbies.org</ulink>.</para>
  </note>

  <section>
    <title>Network Options Configuration</title>

    <para>Here's a screen shot of my Network Options Configuration:<graphic
    align="center" fileref="images/netopts.jpg" /></para>

    <para>While not all of the options that I've selected are required, they
    should be sufficient for most applications. Here's an excerpt from the
    corresponding .config file (Note: If you are running a kernel older than
    2.4.17, be sure to select CONFIG_NETLINK and CONFIG_RTNETLINK):</para>

    <blockquote>
      <programlisting>#
 # Networking options
 #
 CONFIG_PACKET=y
 # CONFIG_PACKET_MMAP is not set
 # CONFIG_NETLINK_DEV is not set
 CONFIG_NETFILTER=y
 # CONFIG_NETFILTER_DEBUG is not set
 CONFIG_FILTER=y
 CONFIG_UNIX=y
 CONFIG_INET=y
 CONFIG_IP_MULTICAST=y
 CONFIG_IP_ADVANCED_ROUTER=y
 CONFIG_IP_MULTIPLE_TABLES=y
 CONFIG_IP_ROUTE_FWMARK=y
 CONFIG_IP_ROUTE_NAT=y
 CONFIG_IP_ROUTE_MULTIPATH=y
 CONFIG_IP_ROUTE_TOS=y
 CONFIG_IP_ROUTE_VERBOSE=y
 # CONFIG_IP_ROUTE_LARGE_TABLES is not set
 # CONFIG_IP_PNP is not set
 CONFIG_NET_IPIP=y
 CONFIG_NET_IPGRE=y
 # CONFIG_NET_IPGRE_BROADCAST is not set
 # CONFIG_IP_MROUTE is not set
 # CONFIG_ARPD is not set
 CONFIG_INET_ECN=y
 CONFIG_SYN_COOKIES=y</programlisting>
    </blockquote>
  </section>

  <section>
    <title>Netfilter Configuration</title>

    <para>Here's a screen shot of my Netfilter configuration:<graphic
    align="center" fileref="images/menuconfig1.jpg" /></para>

    <para>Note that I have built everything I need as modules. You can also
    build everything into your kernel but if you want to be able to deal with
    FTP running on a non-standard port then you <emphasis
    role="bold">must</emphasis> modularize FTP Protocol support.</para>

    <para>Here's the corresponding part of my .config file:</para>

    <blockquote>
      <programlisting>#
#&nbsp;&nbsp; IP: Netfilter Configuration
#
CONFIG_IP_NF_CONNTRACK=m
CONFIG_IP_NF_FTP=m
CONFIG_IP_NF_AMANDA=m
CONFIG_IP_NF_TFTP=m
# CONFIG_IP_NF_IRC is not set
# CONFIG_IP_NF_QUEUE is not set
CONFIG_IP_NF_IPTABLES=m
CONFIG_IP_NF_MATCH_LIMIT=m
CONFIG_IP_NF_MATCH_MAC=m
CONFIG_IP_NF_MATCH_PKTTYPE=m
CONFIG_IP_NF_MATCH_MARK=m
CONFIG_IP_NF_MATCH_MULTIPORT=m
CONFIG_IP_NF_MATCH_TOS=m
CONFIG_IP_NF_MATCH_ECN=m
CONFIG_IP_NF_MATCH_DSCP=m
CONFIG_IP_NF_MATCH_AH_ESP=m
CONFIG_IP_NF_MATCH_LENGTH=m
# CONFIG_IP_NF_MATCH_TTL is not set
CONFIG_IP_NF_MATCH_TCPMSS=m
CONFIG_IP_NF_MATCH_HELPER=m
CONFIG_IP_NF_MATCH_STATE=m
CONFIG_IP_NF_MATCH_CONNTRACK=m
CONFIG_IP_NF_MATCH_UNCLEAN=m
# CONFIG_IP_NF_MATCH_OWNER is not set
CONFIG_IP_NF_FILTER=m
CONFIG_IP_NF_TARGET_REJECT=m
# CONFIG_IP_NF_TARGET_MIRROR is not set
CONFIG_IP_NF_NAT=m
CONFIG_IP_NF_NAT_NEEDED=y
CONFIG_IP_NF_TARGET_MASQUERADE=m
CONFIG_IP_NF_TARGET_REDIRECT=m
CONFIG_IP_NF_NAT_AMANDA=m
CONFIG_IP_NF_NAT_LOCAL=y
# CONFIG_IP_NF_NAT_SNMP_BASIC is not set
CONFIG_IP_NF_NAT_FTP=m
CONFIG_IP_NF_NAT_TFTP=m
CONFIG_IP_NF_MANGLE=m
CONFIG_IP_NF_TARGET_TOS=m
CONFIG_IP_NF_TARGET_ECN=m
CONFIG_IP_NF_TARGET_DSCP=m
CONFIG_IP_NF_TARGET_MARK=m
CONFIG_IP_NF_TARGET_LOG=m
CONFIG_IP_NF_TARGET_ULOG=m
CONFIG_IP_NF_TARGET_TCPMSS=m
CONFIG_IP_NF_ARPTABLES=m
CONFIG_IP_NF_ARPFILTER=m
# CONFIG_IP_NF_COMPAT_IPCHAINS is not set
# CONFIG_IP_NF_COMPAT_IPFWADM is not set</programlisting>
    </blockquote>
  </section>

  <section>
    <title>Kernel 2.6 Netfilter Options</title>

    <para>Here's a screenshot of my modularized 2.6 Kernel config (Navigation:
    Device Drivers → Networking Support → Networking Options → Network Packet
    Filtering (replaces ipchains) → IP: Netfilter configuration):</para>

    <graphic align="center" fileref="images/netfilter2.6.png" valign="middle" />

    <para>Here is the corresponding part of the .config file:</para>

    <blockquote>
      <programlisting>CONFIG_IP_NF_CONNTRACK=m
CONFIG_IP_NF_FTP=m
CONFIG_IP_NF_IRC=m
CONFIG_IP_NF_TFTP=m
CONFIG_IP_NF_AMANDA=m
CONFIG_IP_NF_QUEUE=m
CONFIG_IP_NF_IPTABLES=m
CONFIG_IP_NF_MATCH_LIMIT=m
CONFIG_IP_NF_MATCH_IPRANGE=m
CONFIG_IP_NF_MATCH_MAC=m
CONFIG_IP_NF_MATCH_PKTTYPE=m
CONFIG_IP_NF_MATCH_MARK=m
CONFIG_IP_NF_MATCH_MULTIPORT=m
CONFIG_IP_NF_MATCH_TOS=m
CONFIG_IP_NF_MATCH_RECENT=m
CONFIG_IP_NF_MATCH_ECN=m
CONFIG_IP_NF_MATCH_DSCP=m
CONFIG_IP_NF_MATCH_AH_ESP=m
CONFIG_IP_NF_MATCH_LENGTH=m
CONFIG_IP_NF_MATCH_TTL=m
CONFIG_IP_NF_MATCH_TCPMSS=m
CONFIG_IP_NF_MATCH_HELPER=m
CONFIG_IP_NF_MATCH_STATE=m
CONFIG_IP_NF_MATCH_CONNTRACK=m
CONFIG_IP_NF_MATCH_OWNER=m
CONFIG_IP_NF_MATCH_PHYSDEV=m
CONFIG_IP_NF_FILTER=m
CONFIG_IP_NF_TARGET_REJECT=m
CONFIG_IP_NF_NAT=m
CONFIG_IP_NF_NAT_NEEDED=y
CONFIG_IP_NF_TARGET_MASQUERADE=m
CONFIG_IP_NF_TARGET_REDIRECT=m
CONFIG_IP_NF_TARGET_NETMAP=m
CONFIG_IP_NF_TARGET_SAME=m
CONFIG_IP_NF_NAT_LOCAL=y
CONFIG_IP_NF_NAT_SNMP_BASIC=m
CONFIG_IP_NF_NAT_IRC=m
CONFIG_IP_NF_NAT_FTP=m
CONFIG_IP_NF_NAT_TFTP=m
CONFIG_IP_NF_NAT_AMANDA=m
CONFIG_IP_NF_MANGLE=m
CONFIG_IP_NF_TARGET_TOS=m
CONFIG_IP_NF_TARGET_ECN=m
CONFIG_IP_NF_TARGET_DSCP=m
CONFIG_IP_NF_TARGET_MARK=m
CONFIG_IP_NF_TARGET_CLASSIFY=m
CONFIG_IP_NF_TARGET_LOG=m
CONFIG_IP_NF_TARGET_ULOG=m
CONFIG_IP_NF_TARGET_TCPMSS=m
# CONFIG_IP_NF_ARPTABLES is not set
# CONFIG_IP_NF_COMPAT_IPCHAINS is not set
# CONFIG_IP_NF_COMPAT_IPFWADM is not set
# CONFIG_IP_NF_RAW is not set
CONFIG_IP_NF_MATCH_ADDRTYPE=m
# CONFIG_IP_NF_MATCH_REALM is not set
CONFIG_IP6_NF_QUEUE=m
CONFIG_IP6_NF_IPTABLES=m
CONFIG_IP6_NF_MATCH_LIMIT=m
CONFIG_IP6_NF_MATCH_MAC=m
CONFIG_IP6_NF_MATCH_RT=m
CONFIG_IP6_NF_MATCH_OPTS=m
CONFIG_IP6_NF_MATCH_FRAG=m
CONFIG_IP6_NF_MATCH_HL=m
CONFIG_IP6_NF_MATCH_MULTIPORT=m
CONFIG_IP6_NF_MATCH_OWNER=m
CONFIG_IP6_NF_MATCH_MARK=m
CONFIG_IP6_NF_MATCH_IPV6HEADER=m
CONFIG_IP6_NF_MATCH_AHESP=m
CONFIG_IP6_NF_MATCH_LENGTH=m
CONFIG_IP6_NF_MATCH_EUI64=m
CONFIG_IP6_NF_FILTER=m
CONFIG_IP6_NF_TARGET_LOG=m
CONFIG_IP6_NF_MANGLE=m
CONFIG_IP6_NF_TARGET_MARK=m
# CONFIG_IP6_NF_RAW is not set
CONFIG_DECNET_NF_GRABULATOR=m
CONFIG_BRIDGE_NF_EBTABLES=m
</programlisting>
    </blockquote>
  </section>
</article>