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82 posts

Master Geek
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# 139407 7-Feb-2014 23:10
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Ok, need to get some brains on this little problem, as mine's not working any more...

I have signed up to Big Pipe VDSL offering. I bought myself a Draytek Vigor DV130, which works wonderfully.

I have now connected it up to my Netgear D6300 Router via the LAN port, using the recommended PPPoE Passthru settings, and configured the Netgear to 'dial out'. All works great for general internet access. No problems here.

However, when I want to run a server behind the Netgear router (say, a Minecraft server on port 255xx), the port appears to be blocked.

Looking at the internet settings on the Netgear, the ISP supplied IP address is different to the one on the Vigor modem. Confusing, as I thought in this passthrough mode, the Vigor acted as a dumb modem and just passed along the IP address to the Nertgear router? I'm assuming this is the problem, as any inbound traffic is being stopped at the modem.

Any ideas how I can get the Netgear port forwarding through the Vigor to the outside world? The images below show the current settings on the Draytek Vigor and Netgear router.

Vigor internet settings:

Vigor PPPoE Settings:

Netgear Internet Settings:

If anyone can shed any light on this, it would much appreciated!

(Both devices have the latest firmware installed)

As an aside, when I used to connect to an ADSL service directly with the Netgear router, the port forwarding worked flawlessly. No changes have been made on this router, other than the internet settings to get it to work with the new Draytek Vigor.

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82 posts

Master Geek
+1 received by user: 6

  # 982139 7-Feb-2014 23:57
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Actually, I've just noticed that when I check my IP address from an external source (, for instance), it gives me a COMPLETELY different IP (No VPN's running), and the location is set around Auckland CBD (IP address

The IP range given by the ISP to my modem is in the range 100.64.1.x.

Now, totally confused. Is this block being done at ISP (Big Pipe) level?

6434 posts

Uber Geek
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  # 982141 7-Feb-2014 23:58
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They use cgnat by default. Which means you need to request to be put on a public ip.


Mr Snotty
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  # 982142 8-Feb-2014 00:00
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Yep. They use CG-Nat. If you /really/ need it you can ask them for a public IP but if you feel like you can get away with not having forwarded ports (torrents etc will still work) it's best to leave them for the others. I think they only have a /24 IP range so very limited addresses to give out :)

82 posts

Master Geek
+1 received by user: 6

  # 982145 8-Feb-2014 00:28
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Thanks for the info. Never heard of GG-NAT, but it all makes sense now... :)

I'll drop them an email, as I need my forwarded ports.

82 posts

Master Geek
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  # 984372 11-Feb-2014 18:51
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Just to round off the thread, as I hate leaving things hanging...

BigPipe have kindly provided me with a public IP (switched off the GG-Nat thing), and it worked straight away. My settings were actually fine too, in case anyone's interested.

All working now. Thanks for the heads up. :)

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Uber Geek
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Biddle Corp
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  # 984424 11-Feb-2014 19:54
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Carrier Grade NAT is essentially an ISP putting lots of customers behind a single IPV4 public IP.

It has the potential to break lots of different applications and services.

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