Re: DM200 Modem Only fails.

Peter42 · ‎2019-03-15

I have seen similar posts but with inconclusive answers, so I'll try to be precise with my query.

DM200 Firmware version: V1.0.0.61

DM200 connected directly to laptop.

I have configured the DM200 in Router (Router + Modem) mode and it works.

Router Status is green with ticks on Router Information and Internet Port.

The Internet Port shows the IP Address, Subnet Mask and DNS as valid values and the Internet is accessible.

So I switch to Modem (Modem Only) mode:
Again, Router Status is green with ticks on Router Information and Internet Port.

The Internet Port shows the IP Address, Subnet Mask and DNS as 0.0.0.0 and the Internet is inaccessible.

I have tried this with Passthrough VLAN both ticked and blank.

I have rebooted via the browser after applying the change.

I have fully power cycled the DM200 after applying the change.

In each case the same result: the physical connection is there but I have no IP.

If I switch back to Router (Modem + Router) mode everything is fine again.

Anybody? ...

antinode · ‎2019-03-16

> I am changing Service Provider which entails replacing a Cable Modem
> with a DSL Modem.

That would have been useful information at the beginning. Cable-TV
ISPs generally do not use PPPoE. DSL ISPs frequently do. The
client/router configuration is different between these cases.

> [...] my UTM9 is the default gateway.

That, too, would have been useful information at the beginning. So
far as the DM200 is concerned, effectively, that's your router.

> Would having a Static IP Address etc. get around this problem?

Would your ISP still be using PPPoE? If yes, then no.

> I suspect that your best source of advice is Sophos.

Better than some.

My quick Web search for:

Sophos UTM PPPoE

led straight to:

https://community.sophos.com/kb/en-us/119003

Sophos UTM: Creating a DSL (PPPoE) Ethernet Interface

You might start there.

View solution in original post

antinode · ‎2019-03-15

> So I switch to Modem (Modem Only) mode:
> Again, Router Status is green with ticks on Router Information and
> Internet Port.

You're talking to the modem-only DM200 how, exactly?
("192.168.5.1"?)

> I have configured the DM200 in Router (Router + Modem) mode and it
> works.

"configured" could cover many sins. Does your ISP connection use
PPPoA or PPPoE, and are there credentials (username, password)
associated with that? Any other ISP-related DSL settings?

In modem-only mode, is the DM200 now shirking duties like, say, PPPoE
authentication, so that you're relying on your client device
(unspecified "laptop") to deal with them? And, if so, did you configure
this stuff on the (unspecified) "laptop"?

I'd expect the same sort of considerations to apply if you attached a
router to the DM200-as-modem, instead of your (unspecified) "laptop".
(And I'm not sure that PPPoA is possible with a separate device/router.)

Peter42 · ‎2019-03-16

@antinode wrote:

>   You're talking to the modem-only DM200 how, exactly?
>("192.168.5.1"?)

Laptop: Google Chrome <-> 192.168.5.1 <-> DM200

>   "configured" could cover many sins. Does your ISP connection use
>PPPoA or PPPoE, and are there credentials (username, password)
>associated with that? Any other ISP-related DSL settings?

PPPoE : Username Password : VLAN tag 101

In Router mode this configuration works and I have Internet access.

>   In modem-only mode, is the DM200 now shirking duties like, say, PPPoE
>authentication, so that you're relying on your client device
>(unspecified "laptop") to deal with them? And, if so, did you configure
>this stuff on the (unspecified) "laptop"?

I don't know, is it? If it does rely on the client device there is no mention of that in the User Manual and it will not work in my intended application.

So, no I did not configure this stuff on my (unspecified) laptop since it will not be there.

>   I'd expect the same sort of considerations to apply if you attached a
>router to the DM200-as-modem, instead of your (unspecified) "laptop".
>(And I'm not sure that PPPoA is possible with a separate device/router.)

My requirement is for the modem to establish the connection when in Modem mode, exactly as it does in Router mode.

antinode · ‎2019-03-16

> PPPoE : Username Password : VLAN tag 101
> In Router mode this configuration works and I have Internet access.

Those are router parameters, not modem parameters. If you disable
the router in the DM200, then something else needs to deal with PPPoE
(and other router-related features/parameters). Typically, that would
be a router.

I believe that popular operating systems, including, perhaps,
whatever's on your (unspecified) "laptop", can deal with PPPoE; I'm less
sure about VLAN tagging. Why are you disabling the router in your
DM200?

> My requirement is for the modem to establish the connection when in
> Modem mode, exactly as it does in Router mode.

Think again? "modem" and "modem+router" are spelled differently for
a reason.

michaelkenward · ‎2019-03-16

@Peter42 wrote:

My requirement is for the modem to establish the connection when in Modem mode, exactly as it does in Router mode.

Why? Do you have something else performing router functions?

Modem-only mode is designed so that you can use the DM200 with a router.

As the manual says:

"A typical use of such a mode is when the modem is used only for DSL connectivity behind a WiFi router that provides routing, firewall, WiFi, and other features and to which you can connect multiple devices."

Does using the thing in "router" mode mess up something else on your network?

Peter42 · ‎2019-03-16

Hmmm ...

So it looks like the concensus is that my understanding of a modem is wrong.

I am changing Service Provider which entails replacing a Cable Modem with a DSL Modem.

Currently, the Cable Modem takes care of the Internet connection and my UTM9 is the default gateway.

I was expecting that the DSL Modem would work in the same way.

michaelkenward · ‎2019-03-16

@Peter42 wrote:

Hmmm ...

So it looks like the concensus is that my understanding of a modem is wrong.

Not at all.

But maybe you need to check what a modem does. The DM200 is a rare box for Netgear in that it has this modem-only mode and very limited router capability.

Most Netgear "modems" are in reality full blown modem-routers. For example, I also have the D6400 modem router. You have to jump through various hoops to disable the router bit to get it into modem-only mode. I abandoned that for various reasons, mostly because it takes too long to start after a power cut.

What did your cable modem feed into? And was it a simple modem or another modem router?

....my UTM9 is the default gateway.

What's that?

Peter42 · ‎2019-03-16

@michaelkenward wrote:

What's that?

In my case:-

https://www.sophos.com/en-us/products/free-tools/sophos-utm-home-edition.aspx

Peter42 · ‎2019-03-16

Just had another thought whilst reading the User Manual again ...
Would having a Static IP Address etc. get around this problem?

michaelkenward · ‎2019-03-16

So, some sort of software that runs on a PC?

It shows no sign that it provides router features. Doesn't it work when the DM200 is running as a router?

As this is all about having "a separate, dedicated computer", there has to be something that joins up all the kit on the network.

I suspect that your best source of advice is Sophos.

I can find nothing in the Netgear archive on Sophos or UTM.

michaelkenward · ‎2019-03-16

@Peter42 wrote:

Would having a Static IP Address etc. get around this problem?

Your guess is as good as, probably a lot better than, mine.

antinode · ‎2019-03-16

> I am changing Service Provider which entails replacing a Cable Modem
> with a DSL Modem.

That would have been useful information at the beginning. Cable-TV
ISPs generally do not use PPPoE. DSL ISPs frequently do. The
client/router configuration is different between these cases.

> [...] my UTM9 is the default gateway.

That, too, would have been useful information at the beginning. So
far as the DM200 is concerned, effectively, that's your router.

> Would having a Static IP Address etc. get around this problem?

Would your ISP still be using PPPoE? If yes, then no.

> I suspect that your best source of advice is Sophos.

Better than some.

My quick Web search for:

Sophos UTM PPPoE

led straight to:

https://community.sophos.com/kb/en-us/119003

Sophos UTM: Creating a DSL (PPPoE) Ethernet Interface

You might start there.

Peter42 · ‎2019-03-16

Yes, the solution to the actual problem would appear to be far simpler than solving the problem I was having in running tests on the DM200 with the laptop.

A reply in another forum showed that my UTM 9 could be configured for PPPoE, I had just failed to find the relevant settings <insert facepalm here>

Thanks to all for your contributions ... it's been fun

Peter42 · ‎2019-03-16

Just bit the bullet.

Put the DM200 into Modem mode, reconfigured the UTM 9 and gave it a go ...

and here we are. Up and running

antinode · ‎2019-03-16

> A reply in another forum [...]

A link might be useful to someone someday.

> [...] and here we are. Up and running [...]

Thanks for the report. (What could go wrong?)

It's all a division-of-labor problem, and, of course, everything's
complicated. Either way, there's a modem, but there may also be other
layers. Frequently, you don't care, but sometimes you do.

You can drive a long way without knowing whether your front or rear
wheels are doing the work, but sometimes it matters.