Suehring, Steve. <br/><br/>
Linux firewalls :  enhancing security with nftables and beyond. 

 - 4th ed. 
 - xxi, 400 pages :  illustrations ;  24 cm 
<br/><br/> Earlier ed. authored by Robert L. Ziegler. 
<br/><br/>Includes bibliographical references (pages 313-314) and index. 
<br/><br/><label>ISBN: </label>9789332552340 
<br/><br/><label>LCCN: </label>2014043643 
<br/><br/><label>Subjects--Uniform Titles: </label><br/>Linux.
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computers--Access control.<br/>Firewalls (Computer security)<br/>Operating systems (Computers)
<br/><br/><label>LC Class. No.: </label>QA76.9.A25  / Z54 2015 
<br/><br/><label>Dewey Class. No.: </label>005.8 SUE