Wireshark · Ethereal-users: Re: [Ethereal-users] Only Seeing Outgoing Packets

[Ulf Lamping <ulf.lamping@xxxxxx>]

Guy Harris wrote:
> I've expanded that part of the HubReference page to give more detail, 
> describing the scenario I outlined in an earlier message.
Just slightly redesigned that page ...
> I'm assuming there are at least two types of dual-speed hubs - one 
> type with *no* bridge between the speeds, which I assume means that a 
> 10Mb/s host and a 100Mb/s host plugged into the hub can't communicate 
> at all (so there's no traffic between them to capture), 
Yes, the Level One hub I own doesn't have a bridge at all and shows 
exactly that behaviour. The "guy" at the trade fair where I bought it a 
long time ago told me that it *has* a bridge :-(

... and the thing was really expensive at that time ...
> and one type with a switch between them (so that broadcast and 
> multicast traffic are passed between the speeds, and unicast traffic 
> is passed to the port to which it's being sent), which I assume means 
> that a 10Mb/s host and a 100Mb/s host plugged into the hub can 
> communicate, but another host plugged into the hub can only see one 
> side of the conversation.
>
> (Are there any dual-speed hubs that pass *all* traffic?  I could 
> imagine a lot of 100Mb/s traffic flooding a 10Mb/s port in that case.)
Hmmm, never thought about it, but it makes sense that the bridge in a 
dual speed hub must have (at least some) switching like capabilities.

Regards, ULFL