Re: [tlug] Class B Hubs not suitable for data center use?

[bruno raoult <br@example.com>]

Sumimasen... Wakarimashita...

Thanks,

br.


On Sat, 2002-08-31 at 21:30, Jean-Christian Imbeault wrote:
> >From: bruno raoult <br@example.com>
> >
> >This was the meaning of my first question: This mean they have a default
> >gateway or a routing protocol, no?
> 
> I'm not following you. Maybe yu are confused between MAC addresses (layer 2) 
> and IP addresses (layer 3)?
> 
> If your machine knows that a packet is for a machineon anothernetwork, it 
> addresses the packet for the default gateway (addressing it at both the 
> layer 2 and layer 3 levels). Your machine puts the MAC address of the 
> default gateway into the ethernet packet destination address.
> 
> All the switch does is check which MAC address a packet is destined for 
> (layer 2). It does not check the IP address the packet is for (layer 3).
> 
> The switch has no default gateway information at all.
> 
> Your machine on the other hand does ... that's why it was able to put the 
> MAC address of the default gateway into the packet in the first place ;)
> 
> Hope that clears things up?
> 
> Jc
> 
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