Help with Linksys AM200 and DD-WRT

[WarningHPB]

Hi, firstly i'd like to say that I'm not really that experienced in the whole networking thing, but i can get a network together and working.

At the moment i have my AM200 and WRT54GL (DDWRT v23 SP2) setup as in this this link,

http://jelnet.free.fr/forum/viewtopic.php?t=303

but with a few alteration such as the AM200's LAN IP address as 192.168.1.1

the WAN Port IP of the WRT as 192.168.1.2

the LAN side of the WRT as 192.168.2.1

therefore my computers are all in the 192.168.2.xxx range

But, would like to set up the AM200 in Half bridge mode, as i understand it, all i do is tick the box for "Half Bridge" and then turn on the DHCP on, on the AM200 and then i can change the "internet connection type" to "Auto Configuration - DHCP" on the WRT54GL

but when i do this i can't seem to get access to the internet or the AM200, so i have to revert back to the settings in the link (but with my alterations).

Am i doing something wrong? and to be really honest i don't understand fully what the advantages or disadvantages of having it in "half bridge" are

Thanks for any help

Victor

[_tux_]

i've got the same router and modem as you (in half bridge).

the way i've got it setup is the modem is 192.168.0.1. router 192.168.1.1.

modem in half bridge with dhcp on, nat off.

the router's WAN is set to use dhcp.

i hope that helps :)

[+BudMan MVC]

In half bridge mode you would not setup dhcp on the am200.

Half bridge mode means your gateway (modem/router combo) am200 will log into your PPPoE/PPPoA account for you -- but instead of doing nat, it will bridge your ISPs connection to the wan interface of your router. So your router will get the public IP from your ISP, not the am200.

But you would not have the am200 dhcp server enabled if that is what your wanting to do.. The dhcp client of the wan interface of your wrt54 would get its IP from your isp's dhcp server.

[ruskie666]

I've got the same setup AM200 + WRT54GL. I've been using the double NAT/DMZ way since day one as I was unable to get the PPPOA half bridge method to work! The WRT54GL does not receive the public IP Address from the AM200.

Does this really work?

[WarningHPB]

Hi there, thanks for all the replys, but im stil not sure what im doing wrong cause i still can't seem to get internet access, i've even gone the the extent of reverting the AM200 and WRT54GL all back to factory settings and then modifying the settings, and heres a few of the settings i've got:

The AM200 (modem) settings:

ADSL Settings:

Encapsulation: RFC 2364 PPPoA

Autodetect: Disable

Virtual Circuit ID:

0 VPI

38 VCI

Multiplexing: VC

DSL Modulation: Auto

PPPoA Settings:

User Name: (is entered and correct)

Password: (is entered and correct)

Keep Alive: (is selected)

Redial Period: 0

Half Bridge: Ticked

Modem IP

IP: 192.168.1.1

Subnet Mask: 255.255.255.0

DHCP

Local DHCP Server: Disabled

The WRT54GL (DD-WRT) Settings:

Internet Connection Type

Connection Type: Automatic Configuration - DHCP

STP: Enabled

Router IP

Local IP Adress: 192.168.2.1

Subnet Mask: 255.255.255.0

Gateway: 0.0.0.0

Local DNS: 0.0.0.0

DHCP:

DHCP Type: DHCP server

DHCP server: enabled

Start IP Address: 192.168.2.100

Maximum DHCP Users: 5

Client Lease Time: 1440 minutes

Static DNS 1: 208.67.222.222

Static DNS 2: 208.67.220.220

Static DNS 3: 0.0.0.0

WINS: 0.0.0.0

Use DNSMasq for DHCP: Ticked

Use DNSMasq for DNS: Ticked

DHCP-Authoritative: Ticked

Here's the thing is when the AM200 modem has its DHCP server enabled, it passes the ISP's issued IP address etc to the WRT54GL, but from there I can't seem to get any internet access.

But then the AM200 modem has its DHCP server disabled, the WRT5GL doesn't get anything at all, it just sits there with 0.0.0.0

I forgot to mention 2 things in my first post my AM200 Modem is running 1.19.02 Firmware, and my ISP is Tiscali who use PPPoA not PPPoE

Thanks

Victor

[+BudMan MVC]

disable STP on your linksys

[Al Grant]

I have got a very similar setup. I have a AM300 modem and a DD-WRT v24 router. It was a bit tricky to setup but heres what I did:

1) Got the modem working with just the PC and the AM300 in half bridge - ie the AM300 was passing the real world IP to my PC. Once I got that bit working then I knew that AM300 was doing its bit ok.

2) Then I introduced my DD-WRT into the equation. Firstly I checked that it was handing out a LAN IP to my PC ok, and it was. As you have said the tricky bit seems to be getting the AM300 to pass the address to the DD-WRT. With the AM300, and I dont know why, the AM300 DSL connection must be up before it will (a) handout an IP to the DD-WRT, which will be the real world IP and (b) the DSL must be up for you to be able to access the setup pages for the AM300.

The AM200 might be slightly different to the AM300 but thats what I did.

Also not that if you get it to work and for some reason you modem drops off line and reconnects, thus getting a new IP, it wont automatically pass the new IP to the router, until the DHCP release/renew time is up.

If you look on the DD-WRT forums there is a script which will ping the gateway every 10 seconds to make sure it is up and if not will automatically do a DHCP renew.

I am sorry but I cant remember if I had to have DHCP on in the Am300 or not, you would think that you wouldnt need to because its halfbridge, but then again it was so picky when setting it up, i just cant remember at the mo.

Anyways try the way I said one step at a time.....

HTH

-Al

[ruskie666]

I'll just bump this thread seeing as nobody has posted in nearly a week.

I've setup my AM200 + WRT54GL as the original poster (with slightly different IP addresses), to recap thats PPPOA with half bridge, NAT off and DHCP turned on. On the WRT54GL side, I've set the WAN port to retrieve the public IP address from the AM200 via DHCP.

The same problem occurs, although the router receives the public address you cannot ping remote sites by name/IP from the PC side or when you telnet into the router.

The reason is definately down to an invalid routing table. If I run the 'route' command on the router, I receive only the routes for the LAN side of the network. There is no default route out to the internet on the WAN interface.

If I connect the AM200 directly to my PC, effectively giving my PC a public IP, everyting works correctly! When I run the 'route -print' command in a dos window I can see the default routes out to the modem.

Looking at another post on this forum with a different router (Buffalo I think), the same problem occurs. The question is why isn't the default routes being created in the routing table? I've looked how to turn on a routing protocol (RIP) but I can't find it.

[lexecutil]

I've read about problems like this. It may be that your ISP's default gateway is on a different subnet to your external IP. Apparently windows handles this fine but linux, which I assume your modem is based on has a problem with this. I can't remember what the solution was but I will try to hunt it down. In the mean time can you check if they are both on the same subnet?

Daniel

[ruskie666]

My modems public IP and default address are not on the same subnet. My ip is in the 79.x.x.x range and the DGW is on 212.x.x.x

I've found the same problem here (with a possible solution):

http://www.linksysinfo.org/forums/showthread.php?p=323112

I haven't tried it as yet.

[lexecutil]

Yeah check out this page:

http://www.wlug.org.nz/Half%20bridge%20with%20PPPoA

Good luck. :) Let us know if that fixes it.

[+BudMan MVC]

Nice catch on the default route thing!

[WarningHPB]

well sorry to have bothered u all with this thread, as i've tried so many times to get it working, and it didn't work at all, now im sad to report my AM200 Modem is now dead :(

i was changing the settings on the modem screen when it decided to go up in smoke just a matter of a few minutes ago...

RIP AM200

(i swear sometimes its good to have old router/modems lying around :))

any one got any suggestions on a decent modem that half bridge works with?

Edited July 17, 2008 by WarningHPB

[+BudMan MVC]

The article linked to above about the issue has a listing of modems on the bottom.. example

http://www.wlug.org.nz/Half%20bridge%20with%20PPPoA

The following ADSL2 modems are reported to have better than average half bridge implementation:

* Linksys AM300 (Firmware 1.19.04 )

[WarningHPB]

i think the AM300 is a New Zealand based product, as i can't seem to find it on the Linksys UK site or on the usual E-tailers websites (well the ones I've tried are Dabs.com, Scan.co.uk, ebuyer.com or amazon.co.uk), but only one the New Zealand Linksys website

[+BudMan MVC]

Not sure -- but the UK linksys page shows downloads for the am300. So I am guessing you can get it somewhere.

[_crazy_]

I confirm that the firmware for the Linksys AM300 can be used also for the AM200, tested and now my PPP in half bridge is working well !!

Many thank. :)

[LtTanker]

Hi everybody!!

My config is router WRT-54GL with DD-WRT v24 and modem AM200 with lastest firmware

Soooo I have this problem:

HALF BRIDGE:

I have a half bridge configuration which works just fine.

The problem:

When my IP provided from my ISP is changing (every 3 days) the router is not getting automatically the new one from the modem until "DHCP Lease time" has reached 0. Only when it reach 0 the router will update the adress by himself. It means that I regulary need to update the router's "DHCP lease time" manually to get the connection again!

FULL BRIDGE:

A subsidiary question is: I'm not able to make the WRT-54GL get the IP from AM200 when AM200 is in full bridge mode. But connecting my AM200 in full bridge mode directly to my computer is working, the computer gets the adress...

My connection is PPPoE.

Thanks in advance for your help, advice, recommandation and and and :-)))

Cheers

Fred

[+BudMan MVC]

and your setting up PPPoE on your router when in full bridge mode? are you running sp1 of v24?

[LtTanker]

Yes exactly... PPPoE on the router and it's SP1 v24...