why is my router showing 3 IPv6 and 1 IPv4 for each computer?

[cory733]

My computer is shown four times in my router's (arris tg1672 from time warner) client list. One is IPv4, and the other three are IPv6. This is the same for three computers connected to the router, and for my girlfriends phone. My older phone and another phone only show up as IPv4 and just one. When i check the ip of my computer on a website like ipv6-test, it shows one of the IPv6 ip's. Now i know the ipv4 is used to just to connect my computer and my router, but why three IPv6's? and why does only one show up on the ip checker? Why do they change whenever the computer or phone or whichever device is restarted?

If information being received is sent to the IPv6 ip address, then is my routers firewall useless? i disabled it anyway because it wasnt letting me play my game.

any ideas?

 

[cory733]

On ipv6-test.com, there is a window that has a few suggestions, one is this:

Your router or firewall is filtering ICMPv6 messages sent to your computer. An IPv6 host that cannot receive ICMP messages may encounter problems like some web pages loading partially or not at all.

another is this

The DNS servers that should associate your IPv6 address with a host name are either misconfigured or not responding, this could lead to random latencies when trying to contact many Internet services. DNS servers are usually managed at the ISP level.

Are either of these anything that i should worry about or try to resolve to get a better internet connection?

thanks

 

[bill001g]

It is not common to have IPv6 support from a ISP and even if you do there are not a lot of web sites that support IPv6. Unless you have a actual need I would disable IPv6 in your end devices.

The only real benefit to IPv6 is each machine would have a actual routable address. I feel for most home users this is actually a disadvantage. When you use IPv4 the router must do NAT and traffic can not get to the end machines if you do not port forward. This alone does most of what a firewall does. When you use IPv6 the traffic can get directly to the end devices so now you have a much more complex issue trying to protect stuff. I also tend to not like IPv6 in general because it exposes a unique mac address. It bad enough with all the cookies and other trackers web sites use.

 

[cory733]

It is not common to have IPv6 support from a ISP and even if you do there are not a lot of web sites that support IPv6. Unless you have a actual need I would disable IPv6 in your end devices.

The only real benefit to IPv6 is each machine would have a actual routable address. I feel for most home users this is actually a disadvantage. When you use IPv4 the router must do NAT and traffic can not get to the end machines if you do not port forward. This alone does most of what a firewall does. When you use IPv6 the traffic can get directly to the end devices so now you have a much more complex issue trying to protect stuff. I also tend to not like IPv6 in general because it exposes a unique mac address. It bad enough with all the cookies and other trackers web sites use.

thanks bill,
testmyip.org shows only my IPv6. ipv6-test.com shows both my IPv6 (one of them) and my IPv4 that my router uses and is common for everything connected to it. so im guessing that any websites that dont support IPv6 are still connecting to my routers IPv4?

 

[cory733]

weird, i used this mac to ipv6 converter

http://ben.akrin.com/?p=1347

for every ipv6, none of them match up, except the one android phone that has the actual ff:fe in the ipv6, that one has only one ipv6 and one ipv4 and the ipv6 is made directly from the mac address

 

[cory733]

Dynamic Configuration Settings (IPV6)
A dynamic connection type is the most common. The gateway gets its IP address from a DHCP server at the cable company. If you are not sure of your connection type, use this. For changes to take effect, you must click the Apply button.
Dynamic Configuration (IPV6)
Enable DHCP (IPV6)

this is in the dynamic (ipv6) section of WAN setup. i unchecked the box, Enable DHCP IPv6. now the one android phone that had a mac address revealing ipv6 now only has an ipv4. my other android that before only had ipv4 now has ipv6. my two computers are now showing two IPv6 address instead of three. and none of them are mac address revealing. what is going on here

 

[cory733]

my xbox was on NAT type open before. now its on strict and says "your network is behind a port preserving port symmetric NAT

now the android phone that had a mac address revealing ipv6 now doesnt, and the other phone that didnt now does have a revealing ipv6.

how do i set it to ipv4 only?

 

[bill001g]

I have not used that particular device. Many have the ability to turn off IPv6. No matter how much the vendors claim IPv6 is the greatest thing ever it still causes so many strange issues. Most end devices you can disable the IPv6 support....even though it is nicer if you can do it on the router.