Re: Experts Help Please Settle Arguement - Hub or Switch if ISP offers several IPs
- From: Duane Arnold <notme@xxxxxxxxx>
- Date: Sun, 04 Dec 2005 03:40:36 GMT
Jim Beam <jb@xxxxxxx> wrote in
news:MPG.1dfbb070febd152e989680@xxxxxxxxxxxxxxxxx:
> Subject: Experts Help Please Settle Arguement - Hub or Switch if ISP
> offers several IPs From: Jim Beam <jb@xxxxxxx>
> Newsgroups: alt.internet.wireless
>
> I know this is not a Wireless question but I know the experts here
> that I can be trusted for an accurate answer. (One in particular - Hi
> Jeff) Conditions:
> 1) Cable ISP DHCP server offers multiple IPs
> 2) Common non-routing cable modem.
> 3) Two computers: different IPs desired for online gaming, browsing
> etc. 4) No LAN required
> 5) Using a Router or firewall not part of this discussion
>
> Are these two statements correct?
> "As I said, you don't use a switch in this kind of arrangement.
> Switches break the network into segments but hubs broadcast to
> everyone because it doesn't know where to route packets.
> Switches an algorithim for routing packets at Layer 2. If the switch
> has determined that packets should go to User A, packets destined for
> User B will go to user A first.
> When the switch realizes User A was the wrong destination, it will
> send out a broadcast across the network at which time User B will
> respond. The end result is all the other users get robbed of available
> bandwidth.
>
> With a hub in place, a broadcast is sent out over the network and a
> response is sent back to the hub from the right destination node. The
> first segment gets dedicated on a first-come basis."
You need to understand the basics.
http://www.homenethelp.com/web/explain/about-hubs-and-switches.asp
>
>
>
> "If the ISP will allow you to pull 2 or 3 addresses, you need a hub,
> not a switch.
You need a FW appliance or NAT router that can work with more than one IP
from the ISP. I guess there are some modems that can do it too like
Motorola that can work with more than one IP from the ISP.
> The cable modem can't route. If there is a switch in place, packets
> will get routed to USER A. When packets come in for USER B, they will
> continue to be routed to USER A with a switch in place. In the mean
> time, USER B sits and waits. Then the switch realizes USER A is
> rejecting the packets so it sends a broadcast across the network. USER
> B says, "Hey, I'm over here". Now incoming packets start going to USER
> B. When packets come in destined for USER A, they continue to go to
> USER B, and so and and so on and so on..."
A hub will broadcast to all ports because it doesn't know what machine on
what port wants the inbound traffic. Therefore, you have traffic
collision when a machine on a port using a hub sends outbound while
inbound traffic that doesn't belong to it comes down the port, which
slows the traffic on a hub down. A swicth eliminates this problem as it
knows from what port inbound traffic belongs to based on the NIC's MAC
and (port number I think) it applies in the traffic along with the other
features a smart switch has that a dumb hub doesn't have.
A hub or switch doesn't route traffic by IP to a machine a router or FW
appliance does that.
Routers have built in switch technology and a router can be configured to
be just a switch and plugged into a router that is a gateway router as an
example.
Duane :)
.
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