Re: [MiNT] Weird ping reply

[Adam Klobukowski <atari@gabo.pl>]

Standa Opichal napisał(a):
> Hi,
>
> OK, I found out that the HW address I am getting is my HUB's one. It 
> seems that the bridge or the NAT in the HUB exchanged this. I don't know 
> exactly why, but it is definitely not a mintnet fault.
>
> Anyway, does anyone have idea what was it going there?

If I understand it correctly, addreses you shown are MAC adressed of the 
network cards (and aport in the hub). They are used by Ethernet protocols.

Ping howewer works on the higher level. It works on the IP protocol level.

When you ping or hust tty to connect something using IP protocol), your 
computer first uses ARP (Address resolution protocol) to question the 
network where to send packets. Why? Becouse IP addres may be world-wide, 
and MAC is locally. IP packets gets encapsulated into Ethernet packets, 
and then sent into network. But where? This is where ARP comes handy. 
ARP allows you to ask: "What is a MAC addres of the device that I sgould 
sent IP packets with the following IP address (ie. gateway)".

Maybe it is a bit complicated, and my english is not good enough, but 
basically this is how it works.

--
Semper Fidelis

Adam Klobukowski
atari@gabo.pl