Hello Andrew

On 15-Dec-01, you wrote:

>> It makes Genesis act as a packet forwarder: effectively they're passed
>> from one interface to the other and resent out on the other side - useful
>> if, for instance, it was the only common machine in two networks, but
>> it isn't NAT so basically not much actually works with it apart from
>> basic web/irc type stuff.
> 
> Ok, I think I understand.
> 
> NAT?
> 
> Network Address Translation - right?
> 
> Now, a "packet forwarder" does?

NAT copies packets from one interface, manipulates the data to make it
look like it came from another machine (for instance, 192.168.0.3 ->
212.133.97.8, which is your gateway) and then forwards them on a
different interface.

This way, machines can reply to yours and things work - instead of
machines trying to reply to machines on their own local network.

Packet forwarding is like standing in a queue passing buckets of water
towards a fire - you just take the bucket and hand it to the next in
line. No messing around, and hence your packets still have local
addresses in them.

-- 
Matt

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