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14 posts


#48255 13-Nov-2009 23:22
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I've got a question (a fairly tricky one) - does anyone know if it is possible to setup a Linksys Am300 (basic ADSL2+ 1 port ethernet + usb) router to work as a switch / modem only rather than a full blown router?

OK so here's what I currently have: Linksys AM300 adsl router, Sonicwall TZ170 hardware firewall (with 5 port switch RJ45 + 2 wan RJ45 - primary and fail over) and Netgear WGR514 v7 Wireless router + 4 port RJ45 switch.

Currently, Linksys runs in PPPoA mode (the ethernet port has a an address in range 192.168.10.x range) and forwards all of the traffic to the firewall (as DMZ host). Firewall assigns addresses in 192.168.11.x range to the internal ports. One of these ports has the Netgear router connected to it. Netgear router in its turn assigns addresses in 192.168.12.x range to anything connected though wireless / internal Ethernet ports.

Everything works together ok at the moment. However I'm looking to get rid of the initial hop between the Linksys and the firewall. (NATting things is a nightmare) as I'm running couple of servers (HTTP / SMTP / POP).

FOr the WAN port configuration the firewall has a number of different options: Static IP, DHCP, PPPoE (provides an option to pass username / password), PPTP. CUrrently I'm using the Static IP option.

I also have a static IP address on my ADSL line (I'm with slingshot).

Ok, so is there any way to configure my Linksys to run in a bridge mode? Here are some option on linksys that i have: 
Encapsulation: RFC 1483 Bridged, RFC 1483 Routed, RFC 2516 PPPoE, RFC 2364 PPPoA, and Bridged Mode Only (currently RFC 2364 PPPoA)
VCI (currently 0)
VPI (currently 100)
Multiplexing: LLC and VC (currently VC)

DSL Modulation: Auto, T1.413i2, G.992.1 (G.DMT), G.992.2 (G.Lite), G.922.3(ADSL2), G.992.5(ADSL2+) (currently set to Auto)

So far trying various combinations of Encapsulation / VCI /VPI - i have not been able to get anywhere. But I'm sure this must be possible.

Has anyone attempted a similar setup in the past? Not a complete noob (CCNA from a few years back - but have not really been dealing with networks much in the past couple of years)

Any help is greatly appreciated! (I'm currently reluctant to call Slingshot helpdesk as I'm sure I'll get a "We don't support this type of configuration" response)...

Thanks in advance,

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  #272922 14-Nov-2009 01:09
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I think this should work...

1: Enable half bridge in the AM300 (under PPoA settings)

2: Set the Sonicwall to get it's WAN IP via DHCP, this means it will pickup the ip address and gateway from the AM300, since the AM300 is in half bridge this will be the isp assigned external ip address and gateway.  This should remove NAT between the AM300 and the Sonicwall and remove the need to use the DMZ and forwarding.

3: Use your Sonicwall's DHCP to give out ip addresses to your computers and devices, this includs the Netgear wireless router which should get it's wan side ip address via DHCP from the Sonicwall.

4: Disable NAT and DHCP in the Netgear wireless router and just use it as an access point, clients connected wirelessly get their ip address from the Sonicwall.

Make sure your AM300 has the latest firmware 1.19.04 for Half Bridge to work properly.

Assuming you're on a Slingshot connection provided over by Telecom Wholesale equipment (rather than the next big thing which uses Vodafone equipment) you have to use RFC 2364 PPPoA.

If you're on Slingshot Next Big Thing (Vodafone Red equipment in the exchange) you might be able to use PPOE in raw/full bridge mode in the AM300 (not sure about that).

Since you have a static ip address you might be able to just set the sonicwall's wan interface manually to your external ip address and gateway, try with DHCP first I guess.

Let us know how it goes...

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