shorewall_code/STABLE/documentation/ping.html
teastep 16906234c8 Shorewall 1.4.2
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2003-04-13 15:28:32 +00:00

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<title>ICMP Echo-request (Ping)</title>
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<h1 align="center"><font color="#ffffff">ICMP Echo-request (Ping)</font></h1>
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<br>
Shorewall 'Ping' management has evolved over time with the latest change
coming in Shorewall version 1.4.0. <br>
<h2>Shorewall Versions &gt;= 1.4.0</h2>
In order to accept ping requests from zone z1 to zone z2 where the policy
for z1 to z2 is not ACCEPT, you need a rule in /etc/shoreall/rules of the
form:<br>
<blockquote>ACCEPT&nbsp;&nbsp;&nbsp; <i>z1&nbsp;&nbsp;&nbsp; z2&nbsp;&nbsp;&nbsp;
</i>icmp&nbsp;&nbsp;&nbsp; 8<br>
</blockquote>
Example: <br>
<br>
To permit ping from the local zone to the firewall:<br>
<blockquote>ACCEPT&nbsp;&nbsp;&nbsp; loc&nbsp;&nbsp;&nbsp; fw&nbsp;&nbsp;&nbsp;
icmp&nbsp;&nbsp;&nbsp; 8<br>
</blockquote>
If you would like to accept 'ping' by default even when the relevant
policy is DROP or REJECT, create <b>/etc/shorewall/icmpdef </b>if it doesn't
already exist and in that file place the following command:<br>
<blockquote>
<pre><b><font color="#009900">run_iptables -A icmpdef -p icmp --icmp-type 8 -j ACCEPT<br></font></b></pre>
</blockquote>
With that rule in place, if you want to ignore 'ping' from z1 to z2 then
you need a rule of the form:<br>
<blockquote>DROP&nbsp;&nbsp;&nbsp; <i>z1&nbsp;&nbsp;&nbsp; z2&nbsp;&nbsp;&nbsp;
</i>icmp&nbsp;&nbsp;&nbsp; 8<br>
</blockquote>
Example:<br>
<br>
To drop ping from the internet, you would need this rule in /etc/shorewall/rules:<br>
<br>
<blockquote>DROP&nbsp;&nbsp;&nbsp; net&nbsp;&nbsp;&nbsp; fw&nbsp;&nbsp;&nbsp;
icmp&nbsp;&nbsp;&nbsp; 8<br>
</blockquote>
<h2>Shorewall Versions &gt;= 1.3.14 with OLD_PING_HANDLING=No in /etc/shorewall/shorewall.conf</h2>
In 1.3.14, Ping handling was put under control of the rules and policies
just like any other connection request. In order to accept ping requests
from zone z1 to zone z2 where the policy for z1 to z2 is not ACCEPT, you need
a rule in /etc/shoreall/rules of the form:<br>
<blockquote>ACCEPT&nbsp;&nbsp;&nbsp; <i>z1&nbsp;&nbsp;&nbsp; z2&nbsp;&nbsp;&nbsp;
</i>icmp&nbsp;&nbsp;&nbsp; 8<br>
</blockquote>
Example: <br>
<br>
To permit ping from the local zone to the firewall:<br>
<blockquote>ACCEPT&nbsp;&nbsp;&nbsp; loc&nbsp;&nbsp;&nbsp; fw&nbsp;&nbsp;&nbsp;
icmp&nbsp;&nbsp;&nbsp; 8<br>
</blockquote>
If you would like to accept 'ping' by default even when the relevant
policy is DROP or REJECT, create <b>/etc/shorewall/icmpdef </b>if it doesn't
already exist and in that file place the following command:<br>
<blockquote>
<pre><b><font color="#009900">run_iptables -A icmpdef -p icmp --icmp-type 8 -j ACCEPT<br></font></b></pre>
</blockquote>
With that rule in place, if you want to ignore 'ping' from z1 to z2 then
you need a rule of the form:<br>
<blockquote>DROP&nbsp;&nbsp;&nbsp; <i>z1&nbsp;&nbsp;&nbsp; z2&nbsp;&nbsp;&nbsp;
</i>icmp&nbsp;&nbsp;&nbsp; 8<br>
</blockquote>
Example:<br>
<br>
To drop ping from the internet, you would need this rule in /etc/shorewall/rules:<br>
<blockquote>DROP&nbsp;&nbsp;&nbsp; net&nbsp;&nbsp;&nbsp; fw&nbsp;&nbsp;&nbsp;
icmp&nbsp;&nbsp;&nbsp; 8<br>
</blockquote>
<blockquote> </blockquote>
<h2>Shorewall Versions &lt; 1.3.14 or with OLD_PING_HANDLING=Yes in /etc/shorewall/shorewall.conf<br>
</h2>
There are several aspects to the old Shorewall Ping management:<br>
<ol>
<li>The <b>noping</b> and <b>filterping </b>interface options in <a
href="Documentation.htm#Interfaces">/etc/shorewall/interfaces</a>.</li>
<li>The <b>FORWARDPING</b> option in<a
href="Documentation.htm#Conf"> /etc/shorewall/shorewall.conf</a>.</li>
<li>Explicit rules in <a href="Documentation.htm#Rules">/etc/shorewall/rules</a>.</li>
</ol>
There are two cases to consider:<br>
<ol>
<li>Ping requests addressed to the firewall itself; and</li>
<li>Ping requests being forwarded to another system. Included here
are all cases of packet forwarding including NAT, DNAT rule, Proxy ARP
and simple routing.</li>
</ol>
These cases will be covered separately.<br>
<h3>Ping Requests Addressed to the Firewall Itself</h3>
For ping requests addressed to the firewall, the sequence is as follows:<br>
<ol>
<li>If neither <b>noping</b> nor <b>filterping </b>are specified for
the interface that receives the ping request then the request will be responded
to with an ICMP echo-reply.</li>
<li>If <b>noping</b> is specified for the interface that receives the
ping request then the request is ignored.</li>
<li>If <b>filterping </b>is specified for the interface then the request
is passed to the rules/policy evaluation.</li>
</ol>
<h3>Ping Requests Forwarded by the Firewall</h3>
These requests are <b>always</b> passed to rules/policy evaluation.<br>
<h3>Rules Evaluation</h3>
Ping requests are ICMP type 8. So the general rule format is:<br>
<br>
&nbsp;&nbsp;&nbsp; <i>Target&nbsp;&nbsp;&nbsp; Source&nbsp;&nbsp;&nbsp;
Destination&nbsp;&nbsp;&nbsp; </i>icmp&nbsp;&nbsp;&nbsp; 8<br>
<br>
Example 1. Accept pings from the net to the dmz (pings are responded
to with an ICMP echo-reply):<br>
<br>
&nbsp;&nbsp;&nbsp; ACCEPT&nbsp;&nbsp;&nbsp; net&nbsp;&nbsp;&nbsp; dmz&nbsp;&nbsp;&nbsp;
icmp&nbsp;&nbsp;&nbsp; 8<br>
<br>
Example 2. Drop pings from the net to the firewall<br>
<br>
&nbsp;&nbsp;&nbsp; DROP&nbsp;&nbsp;&nbsp; net&nbsp;&nbsp;&nbsp; fw&nbsp;&nbsp;&nbsp;
icmp&nbsp;&nbsp;&nbsp; 8<br>
<h3>Policy Evaluation</h3>
If no applicable rule is found, then the policy for the source to the
destination is applied.<br>
<ol>
<li>If the relevant policy is ACCEPT then the request is responded
to with an ICMP echo-reply.</li>
<li>If <b>FORWARDPING</b> is set to Yes in /etc/shorewall/shorewall.conf
then the request is responded to with an ICMP echo-reply.</li>
<li>Otherwise, the relevant REJECT or DROP policy is used and the request
is either rejected or simply ignored.</li>
</ol>
<p><font size="2">Updated 2/14/2003 - <a href="support.htm">Tom Eastep</a>
</font></p>
<p><a href="copyright.htm"><font size="2">Copyright</font> &copy; <font
size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a></p>
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