Half Bridge and Double NAT..

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woody99

165 posts

Master Geek

#35159 4-Jun-2009 17:01

OK my quest to get Back to my Mac working continues..

I purchased an Apple Airport Express as my current Orcon Home Hub has "issues" with uPNP so will not work correctly with BTMM. Sadly I did not realise that the Airport does not support PPPOA, as my intention was to stick the Home Hub in bridge mode and run the whole thing from the Airport Express, which would give me the NAT-PMP I needed for BTMM.

So.....

I am trying to see if I can get things going with a DSL-502 GenII modem in half bridge mode. If my understanding is correct, which is highly unlikely, in half bridge, the modem provides login to my ISP but pipes that internet staright to a router (in this case the APX) to do all the DHCP and NAT type stuff. Problem I have is that when I disable NAT in the DSL-502, I have not internet from the APX. If I have NAT enabled on the DSL, I either disable it in the APX, thereby losing the NAT-PMP function I'm after, or I end up double NAT-ed.

So, can someone tell me if I'm:

1. Totally barking up the wrong tree here or..
2. How can I disable NAT on the DSL modem and maintain the internet feed to the APX.

I'm a novice here but it's good fun learning. Any help greatly appreciated.

Cheers

Darryn

Ragnor

8279 posts

Uber Geek
+1 received by user: 585

Trusted

#222120 5-Jun-2009 23:48

PPOA half bridge basically a hack but it has worked successfully for me with both a Linksys AM300 modem and a Dynalink 1320 modem, the reason I mention this is the DLink modems have been known to have a odd implementation of half bridge that doesn't work very well.

In the 502 all you should need to do is set the wan setting to half bridge, enabling or disabling NAT should be irrelevant when the router is in half bridge mode.

Also I would make sure the firmware is updated to the latest version.

woody99

165 posts

Master Geek

#222145 6-Jun-2009 09:15

Thanks for that! Yep tried half-bridge with NAT enabled on the modem for a start, and connected via ethernet to Airport Express which in turn provided wireless internet around the house. As soon as I switched off NAT on the modem, all internet was lost. Time to learn a bit more about NAT..