Path: utzoo!utgpu!watmath!att!tut.cis.ohio-state.edu!ucbvax!proteon.com!tvm From: tvm@proteon.com (Tom Miceli) Newsgroups: comp.sys.proteon Subject: p4200 gives alignment errors Message-ID: <8908152146.AA27775@monk.proteon.com> Date: 15 Aug 89 21:46:01 GMT References: <6549@oregon.uoregon.edu> Sender: daemon@ucbvax.BERKELEY.EDU Organization: The Internet Lines: 27 Dale, The "errors" you have been seeing on the ethernet segment are generated by the interlan IL3010 board that is used in the Proteon P4200. This occurs every 4 seconds when the interface sends out maintenance packets. The details are as follows: "The IL3010 sends packets to itself, making use of the controller, the transceiver cable and connectors, the transceiver itself and the Ethernet coaxial cable. All the ethernet rules are observed including backoff on collision detect and aborting a transmission after 16 attempts. This maintenance sequence causes the IL3010 to transmit two minimum length ethernet packets with source and destination address of 2 7 1 0 0 0. The first of these is sent with an incorrect CRC byte appended, causing a CRC error at all receiving stations. The second packet is sent with valid CRC bytes appended." You have a few options to deal with this issue: 1) We can generate you a load that turns these maintenance packets off. The pitfall to this is that the interface will not know that it is down if something should happen to it. 2) You can replace the interlan interface board with a Proteon Ethernet interface card (P4215). 3) Ignore the "errors" that show up on the receiving stations. If you have any further questions let us know. Thanks, Tom Miceli