Date   : Sun, 05 Jul 2009 17:47:19 +0100
From   : sai2791@... (Steve Inglis)
Subject: econet bridge protocol

There is some information on the packets sent from a bridge on Rick  
Murrays site, http://www.heyrick.co.uk/econet/bridge/detect.html.   
There is also a message that the malware pages reported have been  
deleted so it may be ok to visit.

Steve

On 4 Jul 2009, at 20:42, Phil Blundell wrote:

> Does anybody have documentation on the port &9c protocol used by
> bridges?  Chapter 10 of the MDFS book gives some details but doesn't
> describe the messages with control bytes &80 and &81.
>
> Observing the single bridge that I have here, at power up it seems to
> send a broadcast with control byte &80, containing in its payload the
> number of its other local network; I guess this is the "reset packet"
> that the MDFS book talks about.
>
> If I send the bridge one of those packets (cb &80) then it responds  
> with
> a series of packets with control byte &81 and, again, the network  
> number
> of its far side in the payload.  I'm not entirely sure what the  
> meaning
> of these packets is, or how (if at all) I am meant to respond to them.
>
> Can anybody shed any light on that?  Or, absent any documentation, is
> there anybody with two or more bridges who would be prepared to  
> capture
> some packet dumps showing them talking to each other?
>
> thanks
>
> p.
>
>
>
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