From Firewalls-Owner%greatcircle.com@ans.net Tue Jan 19 12:57:58 1993 Flags: 000000000001 Received: from interlock.ans.net by home.ans.net with SMTP id AA31728 (5.65c/IDA-1.4.4); Tue, 19 Jan 1993 12:57:43 -0500 Received: from relay2.UU.NET by interlock.ans.net with SMTP id AA37920 (InterLock SMTP Gateway 1.1 for ); Tue, 19 Jan 1993 13:00:11 -0500 Received: from mycroft.GreatCircle.COM by relay2.UU.NET with SMTP (5.61/UUNET-internet-primary) id AA06507; Tue, 19 Jan 93 12:59:27 -0500 Received: by mycroft.GreatCircle.COM (4.1/SMI-4.1/Brent-921015) id AA10554; Tue, 19 Jan 93 09:44:42 PST Received: from oxmail.ox.ac.uk by mycroft.GreatCircle.COM (4.1/SMI-4.1/Brent-921015) id AA10547; Tue, 19 Jan 93 09:44:28 PST Received: from nw-gateway.offices.ox.ac.uk by oxmail.ox.ac.uk with SMTP (PP) id <14366-0@oxmail.ox.ac.uk>; Tue, 19 Jan 1993 17:43:01 +0000 Received: From UNIVERSITY_OFFICES/WORKQUEUE by nw-gateway.offices.ox.ac.uk via Charon-4.0-VROOM with IPX id 100.930119174351.416; 19 Jan 93 17:40:27 +500 Message-Id: To: firewalls@greatcircle.com From: Mark Walters Organization: University of Oxford Date: 19 Jan 93 17:43:44 GMT Subject: Packet filtering Priority: normal X-Mailer: Pegasus Mail v2.3 (R5). Sender: Firewalls-Owner@greatcircle.com Precedence: bulk Hi!, I've been looking at what's available for providing packet filtering between a LAN and a campus network. The requirement is slightly unusual because I need to be able to filter/bridge protocols other than IP, ie IPX and AppleTalk. Most of the software that I've found so far only seems geared up for IP, only the dedicated routers seem to be able to handle multiple protocols. If anybody has any information about software that might be able to help I'd appreciate hearing about it! We're part of an academic setup so cost is a big factor... :-( I have heard of one thing that might also be of interest to other people, I've included the README file below. Thanks! Mark Walters ***** cut here ***** Add Security and Cleanup your network by blocking those unwanted packets with The OSU KarlBridge Version 1.33 (now with full SNMP support and more filters) The OSU KarlBridge is a program, that runs on a 286 or 386 clone. It provides a unique and inexpensive Ethernet to Ethernet bridge that performs sophisticated protocol filtering. The bridge can be configured to filter packets based upon ANY Ethernet protocol such as IP, IPX, DECNET, AppleTalk, and etc. In addition it will filter packets based upon IP address, IP network, IP subnet, and socket. It will also filter packets based upon DECNET address, area, Object number and Object name. Also, AppleTalk packets can be filtered based upon server name, printer name, and/or zone name. Some Examples: You can use OSU KarlBridge as a standard medium performance MAC layer Ethernet to Ethernet bridge with SNMP (MIB II, EtherMIB, BridgeMIB & SNMP MIB). You can assemble your own IBM cloan and use the free software or buy the inexpensive pre-assembled and tested commercial version. You can configure OSU KarlBridge to restrict IP traffic from your public computer labs or dial-in-lines to IP addresses and subnets within your campus or enterprise wide network. This will prohibit unauthenticated access to the your machines and/or the Internet in conformance with RFC 1173). You can configure OSU KarlBridge to keep file servers and printers (Apple, Novell, Banyan, LanManager, etc.) on the same network from interacting with each other in undesirable ways. Join thousands of people worldwide who are using the KarlBridge to relieve some of their networking headaches. The OSU KarlBridge is the most flexible and easily configured bridge you have ever seen! Get a copy, read the README file, run the configuration program on your favorite PC, and let me know what you think. The OSU KarlBridge can be obtained via anonymous ftp from: nisca.acs.ohio-state.edu, 128.146.1.7, in /pub/kbridge. Please send e-mail to kbridge@osu.edu with questions and comments. Doug Karl Senior Computer Specialist The Ohio State University ***** cut here ***** ============================================================================== Mark Walters | Internet: mark@university.offices.ox.ac.uk Micro-Computer Support | JANET: mservmrw@uk.ac.ox.vax University Offices | Compuserve 100010,1511 Wellington Square | Tel: +44 (0)865 270246 Oxford OX1 2JD | FAX: +44 (0)865 270708 ============================================================================== PGP2 public key available on request or by fingering mservmrw@black.ox.ac.uk ==============================================================================