Hello Matthias,
 In a message dated 31 Aug 95 you wrote to All :


 MS> you wrote in <memo.603679@cix.compulink.co.uk>:
>pineapple /netbsd: arp info overwritten for 89ef0115 by 00:00:c0:56:4b:af  >pineapple /netbsd: arp info overwritten for 89ef0115 by 00:47:43:22:35:24 
 MS> The ethernet interface of the host with the IP number 137.239.1.21 (or
 MS> maybe the complete host?) was replaced with another one and put back
 MS> afterwards. Nothing to worry about.

I don't believe that it is really the problem because he had 3 message. I had the same thing when packets sent by another system ( A PC running Trumpet Winsock ) was bad : the parameters MTU, RWIN was random!
Check the system 137.239.1.21.

I hope this can help you. 
<regisr>