IPV6 connectivity

[Sunburn74]

Hi. I have an Archer C7 router, internet service from comcast and a rosewill rnx AC 1200 usb adapter.

I cannot get IPV6 internet connectivity to work in windows 7. IPV4 connectivity is working just fine. The same is true on my wifes PC which is an intel NUC which also comes with an AC capable wireless adapter. IPV6 support is enabled on both my router settings and adapter settings and under ipconfig windows is showing an IPV6 address there. None theless, internet connectivity is absent, though connectivity with IPV4 is there.

By all accounts, all my hardware and software should have IPV6 support but I cannot figure out what the issue is. Please assist if you can.

 

[Elixer]

Did you set the C7 to IPv6?
http://www.tp-link.us/faq-881.html
Once that is done, you need to reboot the router, then reboot the machines (or do ipconfig /renew6).

 

[Sunburn74]

Yes I have done that. Within the router setup page I can seen I have an IPV6 address and gateway address as well. Under CMD ipconfig I have a local IPV6 address.

However with windows I don't have connectivity. I have tried some steps I've seen on other websites which involve netsh reset but still no success.

 

[QuietDad]

Your ISP may not be supporting IPv6 yet. Not all of them do and even the one's that do don't necessarily support it thru their whole network. I get IPv6 on the local LAN, but lose it going out.

 

[Sunburn74]

Comcast wouldn't support it? They have an IPV6 DNS server that they have made public...

 

[Elixer]

Yes I have done that. Within the router setup page I can seen I have an IPV6 address and gateway address as well. Under CMD ipconfig I have a local IPV6 address.

However with windows I don't have connectivity. I have tried some steps I've seen on other websites which involve netsh reset but still no success.

You sure it was a valid IPv6 address?
Do you got another device that is IPv6 capable? If so, see if this shows anything http://test-ipv6.com/

 

[QuietDad]

Comcast wouldn't support it? They have an IPV6 DNS server that they have made public...

Comcast support IPv6 in some markets, but not everywhere yet. And in some markets, they don't cover all of it yet.

 

[Sunburn74]

Problem solved. My network adapter doesn't support IPV6. That is the issue after contacting rosewill.

I tested IPV6 on my smart phone and it worked fine.

 

[VirtualLarry]

Problem solved. My network adapter doesn't support IPV6. That is the issue after contacting rosewill.

I tested IPV6 on my smart phone and it worked fine.

That's... weird. The NIC should be Layer2, IPv4 and IPv6 are Layer3. If the Wifi NIC passes Layer2 frames properly, it should work. I'm really curious about this.

Edit: And an AC1200 USB adapter, in this day and age, NOT supporting IPv6? That really doesn't sound right to me.

I have some Rosewill AC1200 adapters, they are like the Edimax ones, Realtek chipset. I use the Edimax drivers with them. When I had them hooked up, I'm pretty sure I had 10/10 on test-ipv6.com .

 

[Puffnstuff]

I know tis is an old thread but I'm seeing strangeness from Comcast here in Jax and IPV6 and I have two ISP's. While using Comcast sometimes one of my routers can connect with them on IPV6 and then it will just go away. I've just installed a new Asus RT-AC88U and using native settings it will not connect to Comcast using IPV6, however, if I set it to 6to4 it can use the IPV6 connection. If I connect using my ATT VDSL router/modem I can stay IPV6 all day long so its not my hardware.

Are there any other's in Jax using Comcast that are having similar issues with IPV6? I contacted Asus tech support to see what they say but I'm beginning to wonder about this. If I connect directly to the cable modem I can stay connected via IPV6 so I'm thinking there's an issue with how they interact with routers since two different models have experienced issues now.

 

[Puffnstuff]

I flashed to AsusWRT-Merlin 380.65_2 firmware this morning and this is the end result for me.

Edit: After a few hours it dropped the IPV6 connection, however, unlike the stock firmware a reboot restores it. It would seem that Asus needs to add something to this router to keep the connection alive so it doesn't get dropped.

 

[Puffnstuff]

I have noticed something about these IPV6 drops. If I have multiple clients on the router it doesn't happen but if my pc is the lone user or if all pc's are shutdown then it drops the IPV6 connection until I reboot. At least Merlin will reconnect to IPV6 once you reboot with it. The stock firmware would only obtain an IPV4 address no matter what I did once the initial allocation was lost.

 

[Puffnstuff]

Now I'm honestly confused. Running Merlin since yesterday morning my router has been able to retain an IPV6 address since I completely powered it down and brought it back up. The stock firmware wouldn't keep an IPV6 address for more than an hour before it dropped the connection and the very first time I came up on Merlin it did the same thing until I powered down and drained it.

 

[[DHT]Osiris]

It shouldn't be 'dropping' your IP address regardless. DHCP should pull a lease for an address, and retain that for however long the lease is for, renewing it prior to expiry. Normally a week or longer for ISP stuff. If your router is dropping connectivity, something is wrong with the router, software, firmware, whatever.

 

[Puffnstuff]

It shouldn't be 'dropping' your IP address regardless. DHCP should pull a lease for an address, and retain that for however long the lease is for, renewing it prior to expiry. Normally a week or longer for ISP stuff. If your router is dropping connectivity, something is wrong with the router, software, firmware, whatever.

I've been going back and forth with Asus technical support over this one and to he honest they aren't much help. Flashing to Merlin seems to be working and this morning it still had its IPV6 address which is exactly as you say it should keep the lease for the designated period until it renews. Asus does want the logs the next time it drops out so I'll provide them plus I informed them of the differences in behavior between their stock firmware and Merlin which is still working. I noticed in the Merlin changelogs that he fixed a IPV6 issue 3 versions ago where Asus had improperly executed one of the protocols. If it continues to work I'll be happy and stick with Merlin.

 

[Puffnstuff]

Well wouldn't you know it that at around 45hrs uptime for IPv6 it dropped out. I sent the logs to Asus but there are multiple complaints from others who've done the same that they don't seem to act upon them. I tried flashing to Merlin's 380.66 alpha software but it only held the connection for 18 minutes and then dropped it so I fell back to his 380.65_4 firmware and will see how this performs. It might just be a problem with the arris surfboard sb6121 modem as Comcast has already EOL'd it and is replacing 3.0 with 3.1 devices and I noticed that they changed the firmware in it removing some features like software based restart/restore to force it to reacquire its settings from Comcast.

 

[VirtualLarry]

Is your firewall on the router passing RA (Router Advisement) packets in both directions (upstream and downstream)?
I had read at one point, lacking those could be a reason, that your ISP's router drops the IPv6 connectivity.

 

[Puffnstuff]

Is your firewall on the router passing RA (Router Advisement) packets in both directions (upstream and downstream)?
I had read at one point, lacking those could be a reason, that your ISP's router drops the IPv6 connectivity.

Larry none of the factory firmware had a prefix designation allocation for IPv6 which is something you pointed out early on, however, Merlin version 380.65 does on its IPv6 settings menu and I'm using that now with excellent results. Once it booted up on that version it immediately established an IPv6 connection which is all any reasonable person can ask of it.

Asus tech support continues to do an end run around without really doing anything to address the elephant in the room and keeps on suggesting the very things that I tried on my own in the beginning which didn't work. I love their products but they've fallen short around router firmware and I'm grateful that RMerlin has devoted so much of his personal time to fixing things on these routers.

 

[Puffnstuff]

Yesterday I swapped out the Ethernet cable between the modem and the router replacing it with a cat 6 in an attempt to rule out all possible causes of the IPv6 drops. If this doesn't work the next weak link in the chain is the sb6121 which is EOL at Comcast. If I can keep my IPv6 connection without any more drops then I'll be happy to keep it as is. Another Asus CS wants the logs when it drops out next time so I'll send them there as well.

 

[Puffnstuff]

Well I've set a record of being connected using IPv6 for over two days now without issue. I'm watching the router logs this time and have noticed that around 10pm at night the wan port loses contact for a few seconds but the dhcp lease isn't due to be renewed.

 

[Puffnstuff]

It's day 3 and I still have an IPv6 address from Comcast. Do you think that the signal quality of the cable could actually affect this? I never lost IPv4 connectivity with the other cable but since moving to the cat 6 cable IPv6 has remained constant without any drops and its the only variable that I'm aware of that has changed in the mix.