<pre><fontface="Courier"size="2"> #ZONE DISPLAY COMMENTS<br> net Internet Internet<br> me Eastep My Workstation<br> loc Local Local networks<br> dmz DMZ Demilitarized zone<br> tx Texas Peer Network in Dallas Texas<br> #LAST LINE - ADD YOUR ENTRIES ABOVE THIS ONE - DO NOT REMOVE</font></pre>
<p> This is set up so that I can start the firewall before bringing up
my Ethernet interfaces. </p>
</blockquote>
<pre><fontface="Courier"size="2"> #ZONE INTERFACE BROADCAST OPTIONS<br> net eth0 206.124.146.255 routefilter,norfc1918,blacklist,filterping<br> loc eth2 192.168.1.255 dhcp,filterping,maclist<br> dmz eth1 206.124.146.255 filterping<br> net eth3 206.124.146.255 filterping,blacklist<br> - texas - filterping<br> loc ppp+ - filterping<br> #LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE</font></pre>
<pre><fontface="Courier"size="2"> #ZONE HOST(S) OPTIONS<br> me eth2:192.168.1.3,eth2:206.124.146.179<br> tx texas:192.168.9.0/24<br> #LAST LINE -- ADD YOUR ENTRIES ABOVE -- DO NOT REMOVE</font></pre>
<pre><fontsize="2"face="Courier"> . /etc/shorewall/common.def<br> run_iptables -A common -p udp --sport 53 -mstate --state NEW -j DROP<br> run_iptables -A common -p tcp --dport 113 -j REJECT</font></pre>
color="#ff0000">WARNING: You must be running Shorewall 1.3.1 or later for<br></font>#<font
color="#ff0000"> this policy to work as expected!!!</font><br> loc loc ACCEPT<br> loc net ACCEPT<br> $FW loc ACCEPT<br> $FW tx ACCEPT<br> loc tx ACCEPT<br> loc fw REJECT<br> net net ACCEPT<br> net all DROP info 10/sec:40<br> all all REJECT info<br> #LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOTE</font></pre>
<p> Although most of our internal systems use static NAT, my wife's system
(192.168.1.4) uses IP Masquerading (actually SNAT) as do visitors with
laptops. Also, I masquerade wookie to the peer subnet in Texas.</p>
</blockquote>
<pre><fontsize="2"face="Courier"> #INTERFACE SUBNET ADDRESS<br> eth0 192.168.1.0/24 206.124.146.176<br> texas 206.124.146.179 192.168.1.254<br> #LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE</font></pre>
<pre><fontsize="2"face="Courier"> #EXTERNAL INTERFACE INTERNAL ALL LOCAL<br> 206.124.146.178 eth0 192.168.1.5 No No<br> 206.124.146.179 eth0 192.168.1.3 No No<br> #LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE</font></pre>
<pre><fontface="Courier"size="2"> #ACTION SOURCE DEST PROTO DEST SOURCE ORIGINAL<br> # PORT(S) PORT(S) PORT(S) DEST<br> #<br> # Local Network to Internet - Reject attempts by Trojans to call home<br> #<br> REJECT:info loc net tcp 6667<br> #<br> # Local Network to Firewall <br> #<br> ACCEPT loc fw tcp ssh<br> ACCEPT loc fw tcp time<br> #<br> # Local Network to DMZ <br> #<br> ACCEPT loc dmz udp domain<br> ACCEPT loc dmz tcp smtp<br> ACCEPT loc dmz tcp domain<br> ACCEPT loc dmz tcp ssh<br> ACCEPT loc dmz tcp auth<br> ACCEPT loc dmz tcp imap<br> ACCEPT loc dmz tcp https<br> ACCEPT loc dmz tcp imaps<br> ACCEPT loc dmz tcp cvspserver<br> ACCEPT loc dmz tcp www<br> ACCEPT loc dmz tcp ftp<br> ACCEPT loc dmz tcp pop3<br> ACCEPT loc dmz icmp echo-request<br> #<br> # Internet to DMZ <br> #<br> ACCEPT net dmz tcp www<br> ACCEPT net dmz tcp smtp<br> ACCEPT net dmz tcp ftp<br> ACCEPT net dmz tcp auth<br> ACCEPT net dmz tcp https<br> ACCEPT net dmz tcp imaps<br> ACCEPT net dmz tcp domain<br> ACCEPT net dmz tcp cvspserver<br> ACCEPT net dmz udp domain<br> ACCEPT net dmz icmp echo-request<br> ACCEPT net:$MIRRORS dmz tcp rsync<br> #<br> # Net to Me (ICQ chat and file transfers) <br> #<br> ACCEPT net me tcp 4000:4100<br> #<br> # Net to Local <br> #<br> ACCEPT net loc tcp auth<br> REJECT net loc tcp www<br> #<br> # DMZ to Internet<br> #<br> ACCEPT dmz net icmp echo-request<br> ACCEPT dmz net tcp smtp<br> ACCEPT dmz net tcp auth<br> ACCEPT dmz net tcp domain<br> ACCEPT dmz net tcp www<br> ACCEPT dmz net tcp https<br> ACCEPT dmz net tcp whois<br> ACCEPT dmz net tcp echo<br> ACCEPT dmz net udp domain<br> ACCEPT dmz net:$NTPSERVERS udp ntp<br> ACCEPT dmz net:$POPSERVERS tcp pop3<br> #<br> # The following compensates for a bug, either in some FTP clients or in the<br> # Netfilter connection tracking code that occasionally denies active mode<br> # FTP clients<br> #<br> ACCEPT:info dmz net tcp 1024: 20<br> #<br> # DMZ to Firewall -- snmp<br> #<br> ACCEPT dmz fw tcp snmp<br> ACCEPT dmz fw udp snmp<br> #<br> # DMZ to Local Network <br> #<br> ACCEPT dmz loc tcp smtp<br> ACCEPT dmz loc tcp auth<br> ACCEPT dmz loc icmp echo-request<br> # Internet to Firewall<br> #<br> ACCEPT net fw tcp 1723<br> ACCEPT net fw gre<br> REJECT net fw tcp www<br> #<br> # Firewall to Internet<br> #<br> ACCEPT fw net:$NTPSERVERS udp ntp<br> ACCEPT fw net udp domain<br> ACCEPT fw net tcp domain<br> ACCEPT fw net tcp www<br> ACCEPT fw net tcp https<br> ACCEPT fw net tcp ssh<br> ACCEPT fw net tcp whois<br> ACCEPT fw net icmp echo-request<br> #<br> # Firewall to DMZ<br> #<br> ACCEPT fw dmz tcp www<br> ACCEPT fw dmz tcp ftp<br> ACCEPT fw dmz tcp ssh<br> ACCEPT fw dmz tcp smtp<br> ACCEPT fw dmz udp domain<br> #<br> # Let Texas Ping<br> #<br> ACCEPT tx fw icmp echo-request<br> ACCEPT tx loc icmp echo-request<br><br> #LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE</font></pre>
