IPv6: Direct, or NAT?

[socal87]

I've been running Asuswrt-Merin for a good while now, first on my AC66, then the AC87 I recently bought. I have IPv6 enabled, and I noticed a few things that don't quite seem right.

First, I used specific DNS servers (Google's) in the DNS server spaces. However, my network clients are showing my router's LAN IP as their IPv6 server.

Second, I noticed that when using whatismyipv6.com, it shows the client IP - not the router's WAN IP. That's a bit disturbing. IPv4 tests show the router's WAN IP.

As a feature addition suggestion, it would be nice to extend the manual IP assignment of the DHCP server to IPv6 as well.

 

[sfx2000]

Ok, so you've entered in:

Google Public DNS (IPv4):

• 8.8.8.8
• 8.8.4.4

The Google Public DNS (IPv6):

• 2001:4860:4860::8888
• 2001:4860:4860::8844

For asus, might have to expand the IPv6 DNS, but I don't think so...

• 2001:4860:4860:0:0:0:0:8888
• 2001:4860:4860:0:0:0:0:8844

The Router will use those for IPv4/IPv6 resolution - this is how dnsmasq works...

To test... here's some test links...

• http://ipv6-test.com/
• http://test-ipv6.com/
• http://ipv6.google.com/
• vsix.us
• Comcast Speedtest
  

Might have to restart all clients and the Router/AP after turning on IPv6

 

[john9527]

First, I used specific DNS servers (Google's) in the DNS server spaces. However, my network clients are showing my router's LAN IP as their IPv6 server.

This is how it works...dnsmasq (the router) acts as a caching DNS server for your clients.

Second, I noticed that when using whatismyipv6.com, it shows the client IP - not the router's WAN IP. That's a bit disturbing. IPv4 tests show the router's WAN IP.

This is how IPv6 works....there is no NAT on IPv6.

 

[sfx2000]

This is how IPv6 works....there is no NAT on IPv6.

Yes and no - while IPv6 is pretty much direct, IPv4 likely will still be NAT'ed, and increasingly so...

And while NAT is likely not an issue, IPv6 subnetting at the ISP layer is going to introduce some interesting things...

Many of the BigTelco/CableCO ISP's are still trying to get their collective minds around this...