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700 posts

Ultimate Geek


#67597 4-Sep-2010 12:02
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Hi,

Finally grabbed a 8840 to use in half bridge mode with my router/firewall. Just got one question, should the 8840 have DHCP enabled or disabled? I assume enabled so it can pass its IP address to the router?

Cheers

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  #376578 4-Sep-2010 14:22
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If using in half bridge then use it as just a modem, dont ask of it for anything else. Regardless I am pretty sure if in half bridge it wont offer DHCP service to your LAN anyway, so turn it off and use the router to perform all those services for you LAN.

Cyril

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  #376596 4-Sep-2010 14:56
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I think that DHCP is required to pass the ip address from your ISP and give it to the first computer (your firewall router) that asks for it on the lan port.




Ray Taylor
Taylor Broadband (rural hawkes bay)
www.ruralkiwi.com

There is no place like localhost
For my general guide to extending your wireless network Click Here




 
 
 
 


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  #376621 4-Sep-2010 15:57
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ahhh, yes ray your probably correct, part of the cludge we call half bridge

Cyril



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Ultimate Geek


  #376772 5-Sep-2010 08:39
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After much trial and error it turns out I needed the following settings:

1. IP Extension enabled.
2. DHCP Server disabled
3. Chanage the IP subnet

If DHCP is enabled the modem passes an IP address in the 192.168.1.X range, thus it needs to be disabled so it passes the WAN IP address. Also needed to change the IP address to 192.168.0.1 as I was using 192.168.1.X on the LAN.

thanks for all the help.

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  #376834 5-Sep-2010 11:38
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That makes sense
My US Robotics is the other way around.
It uses DHCP enabled and will assign the wan ip address to the first computer that asks for it, then it will assign 192.168.x to all subsequent computers.




Ray Taylor
Taylor Broadband (rural hawkes bay)
www.ruralkiwi.com

There is no place like localhost
For my general guide to extending your wireless network Click Here




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  #376866 5-Sep-2010 13:48
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Yeah it depends on the implementation. Some brands/models just ignore the dhcp setting and do what they need to do, others require it on or off.

It's slightly different on all the models I've used TP Link 8840, RTA1320, Linksys AM300.  

A scientific approach is called for (change one option at a time and see what happens heh!).

Separate subnet is always required on the models mentioned above.

Other solutions for getting around the lack of full bridging with PPPoA are:

Draytek Vigor - PPPoA to PPPoE mapping/bridging
Thomson range - Point to point tunnel



700 posts

Ultimate Geek


  #376942 5-Sep-2010 17:56
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Other solutions for getting around the lack of full bridging with PPPoA are:

Draytek Vigor - PPPoA to PPPoE mapping/bridging
Thomson range - Point to point tunnel


Tried a Thomson 536 from TradeMe and thought I had a winner for $8, it was a complete mission to work with. The way the web interface works is terrible, and the crippled firmware used by Telecom just made me give up.

Was tempted by the Draytek but @ $120ish I decided I couldn't justify the money.

With the 8840 setup and running I'm pretty happy, will be interesting to see how stable the connection is.

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