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uk.telecom.broadband (UK broadband) (uk.telecom.broadband) Discussion of broadband services, technology and equipment as provided in the UK. Discussions of specific services based on ADSL, cable modems or other broadband technology are also on-topic. Advertising is not allowed.

ADSL Modem Router?



 
 
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  #1  
Old August 10th 04, 11:45 PM posted to uk.telecom.broadband
Chris
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Posts: 2
Default ADSL Modem Router?

Hi,

I have seen adevrts for ADSL Modems and ADSL Router Modems.
What difference is there between an ADSL Modem and a 1 port ADSL Router
Modem.
I know what a 4 port is and the use but what about the above.
Also recommend any cheap and good ADSL modems that connect by the Ethernet?

Thanx for the info




  #2  
Old August 10th 04, 11:57 PM posted to uk.telecom.broadband
Homer
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Posts: 9
Default ADSL Modem Router?

"Chris" wrote in message
...
Also recommend any cheap and good ADSL modems that connect by the

Ethernet?


This one seems cheap and good going by the reviews, I've bought one and it
works well as a router but don't have broadband yet to try.
http://www.ebuyer.com/customer/produ...duct_uid=48449




  #3  
Old August 11th 04, 12:52 AM posted to uk.telecom.broadband
Paul King
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Posts: 83
Default ADSL Modem Router?

"Chris" wrote in message
...
Hi,

I have seen adevrts for ADSL Modems and ADSL Router Modems.
What difference is there between an ADSL Modem and a 1 port ADSL Router
Modem.
I know what a 4 port is and the use but what about the above.
Also recommend any cheap and good ADSL modems that connect by the

Ethernet?

Thanx for the info



An ADSL modem is simply that - an ADSL modem. It has no switching (routing)
or firewall capability. An ADSL Router/Modem with 1port Ethernet outlet may
have a (rudimentary) firewall capability. Like you - I can't see the point
in a 1port Router!
I use a DLink DSL 300G+ ADSL Modem (now superceded by the DSL 300T) from
DLink. It has an Ethernet outlet which I connect to a DLink DI 624 4port +
wireless Router.
--

Reply address is spamtrapped. Remove theobvious for valid e-mail address


  #4  
Old August 11th 04, 01:01 AM posted to uk.telecom.broadband
Dominic
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Posts: 149
Default ADSL Modem Router?

Paul King wrote:
"Chris" wrote in message
...
Hi,

I have seen adevrts for ADSL Modems and ADSL Router Modems.
What difference is there between an ADSL Modem and a 1 port ADSL
Router Modem.
I know what a 4 port is and the use but what about the above.
Also recommend any cheap and good ADSL modems that connect by the
Ethernet?


I can't see the point in a 1port Router!


As you said yourself, a modem does no routing, that's what the router is
for. If you want to connect an existing network to the internet, you would
not need (or want) a router with a built in network hub/switch - which is
all a 4-port router is. Hence the need for a router with a single ethernet
port. Routers with built in hubs (i.e. what is known as a 4-port router) is
generally designed for those who are sharing an internet connection at home,
or setting up a new, small, network.

Hope this helps.

Dominic


  #5  
Old August 11th 04, 01:31 AM posted to uk.telecom.broadband
Colin Wilson
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Posts: 850
Default ADSL Modem Router?

What difference is there between an ADSL Modem and a 1 port ADSL Router
Modem. I know what a 4 port is and the use but what about the above.


Well, the router will almost certainly use NAT to seperate the internal
and external network.

While it might seem like overkill to only apply this to a single port, it
will block the majority of port scans and hack attempts before they even
get to your machine - if your PC hadn`t asked for data from a particular
source or via opened ports in the router, the router will typically
"drop" the packet without it being passed on to your PC.

A stand-alone ADSL modem will send them all to your PC, so you will have
to have a software firewall in place or some other method to try to
prevent "spurious" activity.

--
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--- My new email address has "ngspamtrap" & @btinternet.com in it ;-) ---
  #6  
Old August 11th 04, 02:00 AM posted to uk.telecom.broadband
Alex Heney
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Posts: 123
Default ADSL Modem Router?

On Tue, 10 Aug 2004 21:45:05 GMT, "Chris" wrote:

Hi,

I have seen adevrts for ADSL Modems and ADSL Router Modems.
What difference is there between an ADSL Modem and a 1 port ADSL Router
Modem.
I know what a 4 port is and the use but what about the above.


A modem is not *directly* shareable. A modem/router is.

A single port modem/router would be intended to have that port plugged
in to a network hub, from where it can be accessed by any PC on the
network.

A straight modem has to be plugged in to a PC, and to share it,
Internet Connection Sharing must be set up with that PC as the host.

--
Alex Heney, Global Villager
Nunnery - Where nuns are hatched

To reply by email, my address is aDOTjDOTheneyATbtinternetDOTcom
  #7  
Old August 11th 04, 11:27 AM posted to uk.telecom.broadband
Eric Lee
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Posts: 18
Default ADSL Modem Router?

On Tue, 10 Aug 2004 22:45:05 +0100, Chris wrote:

Hi,

I have seen adevrts for ADSL Modems and ADSL Router Modems. What
difference is there between an ADSL Modem and a 1 port ADSL Router
Modem.
I know what a 4 port is and the use but what about the above. Also
recommend any cheap and good ADSL modems that connect by the Ethernet?

Thanx for the info


"1-Port ADSL/Modem/Router" and the like generally means 1 ethernet port
and why is this a Router? Read on.

A device is a Router if it implements IP protocol and thus has a built-in
routing table and has the capability to act as a Gateway. Routing
capability is necessary because your external (WAN) IP address is on a
diffent Network Number than your internal (LAN) address, which will
normally be one of the RFC-1918 adresses from the 192.168.x.x block.
The route table is in this case trivial:

Don't route 192.168.x.x
Route everything else via PPP over WAN to ISP

The second entry allows your router to act as an Internet Gateway on
behalf of your LAN

Whether the device has one or four ethernet ports is a separate issue, if
it's got more that 1 port it's a switch (archaicically hub). Hence some
descriptions read: "Combined ADSL Modem, Router and 4-port Switch"

ADSL Modems which are USB connected are typically Bridges and operate at
a protocol layer one lower than IP, they thus don't implement IP and are
not Routers. These devices forward the frames to a PC which becomes the
PPP endpoint and thus has a real WAN IP address, not a private RFC-1918
address and thus doesn't require a routing table.

Regards

Eric Lee

Refs

ftp://ftp.uu.net/inet/rfc/rfc1918.Z

Glossary:

PPP - Point-to-Point Protocol - used to pass (IP) datagrams over another
bearer protocol eg PPPoA

PPPoA - PPP over ATM - What your ADSL modem does.

ATM - Asynchronous Transfer Mode - BT's Backbone protocol used to
transport various payloads.

LAN - Local Area Network

WAN - Wide Area Network
  #8  
Old August 11th 04, 12:42 PM posted to uk.telecom.broadband
Chris Watts
external usenet poster
 
Posts: 99
Default ADSL Modem Router?


"Eric Lee" wrote in message
...
Whether the device has one or four ethernet ports is a separate issue, if
it's got more that 1 port it's a switch (archaicically hub). Hence some
descriptions read: "Combined ADSL Modem, Router and 4-port Switch"

I think that you will fnd that a switch and a hub are quite different. IIRC
a hub broadcasts all receieved packets to every port; a switch builds up a
routing table and sends only on the port to which the destination device is
attached. Hence a switch can support several simultaneous logical
connections, which a hub cannot, giving it a greater througput. It is true
that switches have effectively replaced hubs for that reason.

Chris


  #9  
Old August 11th 04, 12:58 PM posted to uk.telecom.broadband
[email protected]
external usenet poster
 
Posts: 1
Default ADSL Modem Router?

On Wed, 11 Aug 2004 10:27:19 +0100, Eric Lee
wrote:

On Tue, 10 Aug 2004 22:45:05 +0100, Chris wrote:

Hi,

I have seen adevrts for ADSL Modems and ADSL Router Modems. What
difference is there between an ADSL Modem and a 1 port ADSL Router
Modem.
I know what a 4 port is and the use but what about the above. Also
recommend any cheap and good ADSL modems that connect by the Ethernet?

Thanx for the info


"1-Port ADSL/Modem/Router" and the like generally means 1 ethernet port
and why is this a Router? Read on.

A device is a Router if it implements IP protocol and thus has a built-in
routing table and has the capability to act as a Gateway. Routing
capability is necessary because your external (WAN) IP address is on a
diffent Network Number than your internal (LAN) address, which will
normally be one of the RFC-1918 adresses from the 192.168.x.x block.
The route table is in this case trivial:

Don't route 192.168.x.x
Route everything else via PPP over WAN to ISP

The second entry allows your router to act as an Internet Gateway on
behalf of your LAN

Whether the device has one or four ethernet ports is a separate issue, if
it's got more that 1 port it's a switch (archaicically hub). Hence some
descriptions read: "Combined ADSL Modem, Router and 4-port Switch"

ADSL Modems which are USB connected are typically Bridges and operate at
a protocol layer one lower than IP, they thus don't implement IP and are
not Routers. These devices forward the frames to a PC which becomes the
PPP endpoint and thus has a real WAN IP address, not a private RFC-1918
address and thus doesn't require a routing table.

Regards

Eric Lee

Refs

ftp://ftp.uu.net/inet/rfc/rfc1918.Z

Glossary:

PPP - Point-to-Point Protocol - used to pass (IP) datagrams over another
bearer protocol eg PPPoA

PPPoA - PPP over ATM - What your ADSL modem does.

ATM - Asynchronous Transfer Mode - BT's Backbone protocol used to
transport various payloads.

LAN - Local Area Network

WAN - Wide Area Network


I`m confused now.

I want the best way to connect a stand alone XP PC to broadband.

My studies so far indicate I should use a router rather than a modem,
and presumably a single port router. Can you recommend a value for
money component for a modest user?

Thank you.
 




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