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Add new example to the Multi-ISP doc including the output of 'shorewall show routing'
git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@9245 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
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@ -1255,4 +1255,172 @@ wlan0 192.168.0.0/24</programlisting><note>
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</note></para>
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</section>
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</section>
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<section>
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<title>A Complete Working Example</title>
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<para>This section describes the network at shorewall.net early in 2009.
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The configuration is as follows:</para>
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<itemizedlist>
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<listitem>
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<para>Two providers:</para>
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<itemizedlist>
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<listitem>
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<para>Avvanta -- A slow (1.5mb/384kb) DSL service with 5 static IP
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addresses.</para>
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</listitem>
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<listitem>
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<para>Comcast -- A fast (20mb/10mb) Cable circuit with a single
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<emphasis>dynamic</emphasis> address.</para>
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</listitem>
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</itemizedlist>
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</listitem>
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<listitem>
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<para>A local network consisting of wired and wireless client systems.
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A Linksys WRT300N wireless router is used as an access point for the
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wireless hosts; the WAN port on the router is unused as is the builtin
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DHCP server. The firewall runs a DHCP server.</para>
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</listitem>
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<listitem>
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<para>A DMZ hosting a single server (lists.shorewall.net aka
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www1.shorewall.net, ftp1.shorewall.net,etc.)</para>
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</listitem>
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</itemizedlist>
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<para>The network is pictured in the following diagram:</para>
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<graphic align="center" fileref="images/Network2009.png" />
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<para>Because of the speed of the cable provider, all traffic uses that
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provider unless there is a specific need for the traffic to use the DSL
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line. As a consequence, I have disabled all route filtering on the
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firewall and do not use the <emphasis role="bold">balance</emphasis>
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option in <filename>/etc/shorewall/providers</filename>.</para>
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<para><filename>/etc/sysctl.conf</filename>:</para>
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<programlisting>net.ipv4.conf.all.rp_filter = 0</programlisting>
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<para><filename>/etc/shorewall/providers</filename>:</para>
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<programlisting>#NAME NUMBER MARK DUPLICATE INTERFACE GATEWAY OPTIONS COPY
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Avvanta 1 0x100 main eth0 206.124.146.254 track,loose eth2,eth4,tun*
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Comcast 2 0x200 mai eth3 detect track eth2,eth4,tun*
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#LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE</programlisting>
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<para>The <emphasis role="bold">loose</emphasis> option on Avvanta results
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in fewer routing rules. The first two routing rules below insure that all
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traffic from Avvanta-assigned IP addresses is sent via the Avvanta
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provider. Note that because the Comcast line has a dynamic IP address, I
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am not able to use USE_DEFAULT_RT=Yes in
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<filename>/etc/shorewall/shorewall.conf</filename>.</para>
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<para><filename>/etc/shorewall/route_rules</filename>:</para>
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<programlisting>#SOURCE DEST PROVIDER PRIORITY
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206.124.146.176/30 - Avvanta 26000
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206.124.146.180 - Avvanta 26000
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- 216.168.3.44 Avvanta 26000 # Avvanta NNTP Server -- verifies source IP address
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#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE</programlisting>
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<para>The <filename>/etc/shorewall/route_rules </filename>entries provide
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all of the provider selection necessary so my
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<filename>/etc/shorewall/tcrules</filename> file is used exclusively for
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traffic shaping of the Avvanta line.</para>
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<para>Here is the output of <command>shorewall show
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routing</command>:</para>
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<programlisting>Routing Rules
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0: from all lookup local
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10000: from all fwmark 0x100 lookup Avvanta
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10001: from all fwmark 0x200 lookup Comcast
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20256: from 71.227.156.229 lookup Comcast
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26000: from 206.124.146.176/30 lookup Avvanta
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26000: from 206.124.146.180 lookup Avvanta
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26000: from all to 216.168.3.44 lookup Avvanta
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32766: from all lookup main
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32767: from all lookup default
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Table Avvanta:
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206.124.146.254 dev eth0 scope link src 206.124.146.176
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206.124.146.177 dev eth4 scope link
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172.20.1.0/24 dev eth2 proto kernel scope link src 172.20.1.254
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206.124.146.0/24 dev eth0 proto kernel scope link src 206.124.146.176
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169.254.0.0/16 dev eth0 scope link
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default via 206.124.146.254 dev eth0 src 206.124.146.176
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Table Comcast:
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206.124.146.177 dev eth4 scope link
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71.227.156.1 dev eth3 scope link src 71.227.156.229
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172.20.1.0/24 dev eth2 proto kernel scope link src 172.20.1.254
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71.227.156.0/23 dev eth3 proto kernel scope link src 71.227.156.229
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default via 71.227.156.1 dev eth3 src 71.227.156.229
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Table default:
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Table local:
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broadcast 127.255.255.255 dev lo proto kernel scope link src 127.0.0.1
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broadcast 172.20.1.0 dev eth2 proto kernel scope link src 172.20.1.254
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broadcast 206.124.146.255 dev eth0 proto kernel scope link src 206.124.146.176
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local 206.124.146.179 dev eth0 proto kernel scope host src 206.124.146.176
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local 206.124.146.178 dev eth0 proto kernel scope host src 206.124.146.176
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local 206.124.146.176 dev eth0 proto kernel scope host src 206.124.146.176
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local 206.124.146.176 dev eth4 proto kernel scope host src 206.124.146.176
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broadcast 71.227.157.255 dev eth3 proto kernel scope link src 71.227.156.229
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broadcast 71.227.156.0 dev eth3 proto kernel scope link src 71.227.156.229
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local 172.20.1.254 dev eth2 proto kernel scope host src 172.20.1.254
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local 127.0.0.2 dev lo proto kernel scope host src 127.0.0.1
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broadcast 172.20.1.255 dev eth2 proto kernel scope link src 172.20.1.254
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local 71.227.156.229 dev eth3 proto kernel scope host src 71.227.156.229
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broadcast 206.124.146.0 dev eth0 proto kernel scope link src 206.124.146.176
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broadcast 127.0.0.0 dev lo proto kernel scope link src 127.0.0.1
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local 206.124.146.180 dev eth0 proto kernel scope host src 206.124.146.176
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local 127.0.0.1 dev lo proto kernel scope host src 127.0.0.1
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local 127.0.0.0/8 dev lo proto kernel scope host src 127.0.0.1
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Table main:
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206.124.146.177 dev eth4 scope link
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172.20.1.0/24 dev eth2 proto kernel scope link src 172.20.1.254
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206.124.146.0/24 dev eth0 proto kernel scope link src 206.124.146.176
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71.227.156.0/23 dev eth3 proto kernel scope link src 71.227.156.229
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169.254.0.0/16 dev eth0 scope link
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127.0.0.0/8 dev lo scope link
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default via 71.227.156.1 dev eth3 </programlisting>
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<para><filename>/etc/shorewall/interfaces</filename>:</para>
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<programlisting>#ZONE INTERFACE BROADCAST OPTIONS
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loc eth2 detect dhcp,routeback
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dmz eth4 detect
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net eth0 detect dhcp,blacklist,tcpflags,optional
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net eth3 detect dhcp,blacklist,tcpflags,optional
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#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE</programlisting>
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<para><filename>/etc/shorewall/masq</filename>:</para>
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<programlisting>#INTERFACE SOURCE ADDRESS PROTO PORT(S) IPSEC
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COMMENT Masquerade Local Network
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eth3 0.0.0.0/0
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eth0 !206.124.146.0/24 206.124.146.179
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#LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE
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</programlisting>
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<para>All traffic leaving eth3 must use the dynamic IP address assigned to
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that interface as the SOURCE address. All traffic leaving eth0 that does
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not have an address falling within the Avvanta subnet (206.124.146.0/24)
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must have its SOURCE address changed to 206.124.146.179.</para>
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</section>
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</article>
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docs/images/Network2009.dia
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docs/images/Network2009.dia
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docs/images/Network2009.png
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docs/images/Network2009.png
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