Yeah just for some peoples clarification a hub is totally differenet than a
switch. A hub brodcast all the packets to every machine. A swich connects
directly to another socket.
~Brandon
----- Original Message -----
From: "David Oberbeck" <[EMAIL PROTECTED]>
To: "Rusty Carruth" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Sent: Wednesday, August 08, 2001 11:24 AM
Subject: Re: Re[2]: [expert] Why I can't see all packets on my network
segment?
> On Wednesday 08 August 2001 08:50, Rusty Carruth wrote:
> > David Oberbeck <[EMAIL PROTECTED]> wrote:
> > > Greetings,
> > >
> > > Is your network using hubs or a switches?
> >
> > Um, not meaning to be rude, but: He already said that his
> > computer is plugged into a hub. However, I was wondering
> > what THAT hub was plugged into, and if there are any other
> > computers plugged into that hub that he could make access
> > the network.
>
> Yes, your question is a valid one - what is the rest of the network
> topology? Are there switches upstream?
>
> (Somewhat OT: Sadly, rudeness is what I have come to expect, even
> in forums such as this.
> Many times, when attempting to help people, it is necessary to
> 'calibrate' the level at which you are communicating. I have found a
> surprising number of people who use the terms 'hub' and 'switch'
> interchangeably)
>
> > >
> > > > BTW: The label on the box where my ws is plugged into plainly says
> > > > "Dual speed 16-port Ethernet/Fast Ethernet Hub" so this is not
switch.
> > > > ;-)
>
> > Hmm. Question - what are the network speeds for all the NICs
> > hooked to that 'hub'? What's the uplink speed?
>
> > *IF* the uplink is 100, and YOU are 10, then it seems like
> > the 'hub' cannot act ENTIRELY like a 'dumb hub', else you'd
> > not be able to get all the packets that might be sent to
> > you. (Anybody know what happens to a 10/100 HUB when a 100
> > side streams more than 10 MB/s at a 10MB side???? Or, more
> > to the point of THIS situation - what happens when the
> > total traffic on all segments is greater than the rx bandwidth
> > of one of the receivers? In other words, HOW can a 10/100
> > 'HUB' be a PURE hub???? (and not have any features of a
> > switch)).
>
> It's not a 'pure hub'. Older hubs were single-speed: Analog
> wigglies came in, they were re-clocked then re-transmitted to all
> (other, e.g. not the one the packet came in on) ports. Multi-speed
> hubs are digital in between the goes-inta and goes-outa, and do not
> have a strict time relationship between the ports.
>
> FYI, in the case of a multi-speed configuration (e.g. 10/100 mix) a
> digital hub spools some (small) number of packets, then dumps the
> rest. If the destination was on the slow side, the originating host
> will re-transmit the packet when it doesn't get a response from the
> packet(s) that the hub dropped. Switches generally have larger buffers
> when going from a faster to slower ports, but if there is too much
> higher-speed traffic then it, too, will dump packets as with a hub.
>
> Managed switches can be interrogated for statistics on exactly this
> kind of occurrance.
>
> > Its early, and I'm incoherent, so I hope this makes sense ;-)
> >
> > rc
> >
> >
> > Rusty E. Carruth Email: [EMAIL PROTECTED] or
> > [EMAIL PROTECTED] Voice: (480) 345-3621 SnailMail: Schlumberger ATE
> > ___ FAX: (480) 345-8793 7855 S. River Parkway,
> > Suite 116 \e/ Ham: N7IKQ @ 146.82+,pl 162.2 Tempe, AZ 85284-1825
> > V ICBM: 33 20' 44"N 111 53' 47"W
> > http://tuxedo.org/~esr/ecsl/index.html
>
>
> --
>
> "Entropy Requires No Maintenance"
>
>
