Router problem

[CluelesPasty]

Anyone got any idea if there is a way of using a Netgear mr 314 DSL router to connect using a ADSL modem? It's too nice a piece of kit to sell and my mate has tried everything with modems.

[nvening]

i swaer dsl and adsl are basically the same, i have dsl and use an adsl modem

[RVF500]

Having looked briefly at the set up diagram on the Netgear website the router connects to the cable/DSL modem via Ethernet. Given that I would think that an ADSL modem with an Ethernet port would do the trick. Theorietically. The rest would depend on the routing that you set up.

Generically speaking, as I don't know the exact functionality of the Netgear device.

You would need to set up a default route on the router pointing toward the ADSL Modem.
If the modem carries out NAT then disable NAT on the router. 2 lots of NAT running will simply confuse the issue and routing will not take place. The public IP address (assigned by the ISP) goes on the interface facing the 'net' on the modem (sorry if I'm teaching you to suck eggs)
With the above scenario you would need to use a fixed internal IP address on the router port towards the modem and if the modem port is configurable do the same towards the router. The internal IP address should be an RFC 1918 address, the most common format used is 192.168.0.0 255.255.255.0 Might I suggest a network for your point to point of 192.168.1.1 255.255.255.252 and 192.168.1.2 255.255.255.252 and let DHCP take care of your internal network from the router back.

If you NAT from the router you will need at least 3 public IP addresses from the ISP. 1 for the 'net' interface and two for the point to point network between the router and the modem. This is because they will be visible to the outside world without the benefit of hiding behind a NAT configuration. I would doubt that the modem would have the facility to set up a passive interface towards the 'net' to prevent route leaking of private routes.

Hope this helps. Hope I haven't told you a bunch of stuff you already know.

[RVF500]

ADSL is a 'flavour' of DSL as is g.SHDSL (which you will begin to see coming out in future) VDSL which was the video over the telephone network that BT was tinkering with a few years back. There are a few others too which are not in common usage as ADSL is the most adaptive for residential and corporate use at the present time.

Cable modems are different as the utilise the RF capabilities of a broadband TV signal. DSL uses the electrical spectrum above 4 kHZ by taking individual sections of 64 kB channels and transmitting packets seperately down each channel. Hence broadband. The most data you can transmit down a 64 kB voice channel over copper wire is 33.3 Kbps (54k uses compression to fool the modem) so a group of 64 k channels is used, each one running at 33.3 kBps.

[Matt1eD]

Shoudn't this be in connectivity?