Note that the second example on the first page, two different addresses and subnets having the same broadcast address, is totally bogus. I apologize for the mistake. The following example is correct.
<p>

<table>
<tr><td>&nbsp;</td><td>source</td><td>&nbsp;&nbsp;</td><td>forwarding</rd></tr>
<tr><td>address</td><td>198.168.10.178</td><td>&nbsp;&nbsp;</td><td>198.168.10.138</td></tr>
<tr><td>subnet mask</td><td>255.255.255.240</td><td>&nbsp;&nbsp;</td><td>255.255.255.192</td></tr>
<tr><td>subnet</td><td>198.168.10.176</td><td>&nbsp;&nbsp;</td><td>198.168.10.128</td></tr>
<tr><td>address</td><td>198.168.10.191</td><td>&nbsp;&nbsp;</td><td>198.168.10.191</td></tr>
</table>
Dennis O'Brien pointed this out at the time of publication. My thanks to Mr. O'Brien.
<p>
<img src="IP_forwarding/page-1.jpg" width=95%>
<br>
<img src="IP_forwarding/page-2.jpg" width=95%>