(Message inbox:43) Return-Path: netsec-approval@ece.pdx.edu Delivery-Date: Thu Apr 15 08:43:03 2004 Return-Path: Received: from iron.cat.pdx.edu (Majordomo@localhost [127.0.0.1]) by iron.cat.pdx.edu (8.12.10/8.12.10) with ESMTP id i3FFgB2a004338 (version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=NO) for ; Thu, 15 Apr 2004 08:42:17 -0700 (PDT) Received: (from Majordomo@localhost) by iron.cat.pdx.edu (8.12.10/8.12.8/Submit) id i3FFgBEr004335 for netsec-outgoing; Thu, 15 Apr 2004 08:42:11 -0700 (PDT) X-Authentication-Warning: iron.cat.pdx.edu: Majordomo set sender to owner-netsec@cs.pdx.edu using -f Received: from sirius.cs.pdx.edu (root@sirius.cs.pdx.edu [131.252.208.57]) by iron.cat.pdx.edu (8.12.10/8.12.10) with ESMTP id i3FFfo2a004297 (version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=NO); Thu, 15 Apr 2004 08:41:55 -0700 (PDT) Received: from sirius.cs.pdx.edu (jrb@localhost [127.0.0.1]) by sirius.cs.pdx.edu (8.12.10/8.12.10) with ESMTP id i3FFfkLJ020619; Thu, 15 Apr 2004 08:41:46 -0700 (PDT) Message-Id: <200404151541.i3FFfkLJ020619@sirius.cs.pdx.edu> To: netsec@cs.pdx.edu cc: jrb@cs.pdx.edu Subject: ports Date: Thu, 15 Apr 2004 08:41:46 -0700 From: Jim Binkley X-Virus-Scanned: by amavisd-new Sender: owner-netsec@cs.pdx.edu Precedence: bulk It should be becoming blindingly obvious that it is important to know what you can about tcp and udp ports ... due to 1. services you have up on your box that you don't understand and would like to shut down. 2. attacks launched at you over the Internet 3. ACL examples offered up in class that mention port XYZZY So here are some class study questions. Please answer on-line. 1. What sources of information exist on ports on the web or on your computer? 2. How can you determine which ports you are using? 3. How can you determine which ports are under attack? 4. What are these ports used for? tcp/1241 tcp/6881 udp/6970 udp/6257 tcp/8080 j.