True about the DHCP (and some do DNS too), although that shouldn't
require much speed. That's why I didn't mention that before. You would
get gigabit speed between devices connected to that switch.
BTW, I recently replaced my router. The old one was limited to about
12Mbps for interent, and my ISP got faster than that. The new router
will abow the up to 20Mbps I can get now. It also has 802.11n WiFi and a
gigabit switch. The old router is still there just as an additional
switch for slow devices.
This just shows I don't know how things work:
If I sent a file between two laptops wired to the switch, isn't the
router/DHCP server needed to tell the switch which is which laptop? Or
is it so that once the switch is told by the DHCP server that the blue
wire on port 1 goes to the blue laptop and the black wire on port 4 to
the black laptop, that the DHCP server isn't needed anymore? For how
long does that work?
Or does the switch send the whole file (in packets) to the router/DHCP
server, which then sends it back with the port #/DHCP address of the
DHCP is used by each computer when the PC is first booted or connected
to the network. This is how your computer gets a network address. If is
not used for individual transfers.
The DHCP server does not control the switch. As far as I can tell, the
switch creates a table associating devices with physical ports. It does
this by examining the data passing through it.
A file transfer between computers does not in any way go through your
internet router. It is sent directly to it's destination. Like mail, the
data has a destination address on it. The switch knows where it goes,
and the PC you're sending it to knows it's own address and accepts it.
In most cases, the router never sees it (the switch doesn't send it to
Thanks, I think. But if I turn my router off, how long before the switch
"forgets" the destination addresses?
There have been a few (thankfully just a few) instances were things got
totally muffed up in the sense that I couldn't "go" anywhere anymore
(mostly the internet), and I got things right again by turning everything
off, then turning them on again, starting with the router, then the
switch, then the computers.
The switch should never forget as long as it has power. This might be a
problem when you're rearranging connections. In that case, reset the switch.
DHCP is needed ONLY when a computer first connects to a network, unless
you manually renew a lease (seldom needed) or a lease expires (often 24
DNS could have gotten confused. Restarting everything clears the cache
(memory) and usually fixes it.
You probably don't need DNS for local connections (on your own network).
In my area, the cable company and the phone company are engaged in a
broadband subscriber war. Result: phone company is providing a free
modem, free install, and a bunch of other freebies. No price increase
for five years guaranteed with no contract required.
They made it easy to choose them over Comshaft.
Actually, the cheapest modem on their "approved" list is $54. I'm sure
the $3.95 x 12 has some taxes and "surcharges" added, so it may end up
being about 1 year wash. Even if I had to buy a new modem every year
to stay up to date with any new features they add (which won't happen)
it makes sense to buy, which is my plan.
Comcast has jacked their modem rental fee up to $7 earlier this year. I
bought a cable modem when they first started the rental fee @ $3. I
could have purchased four more since then with the money we saved.
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