IPv6 just stop to work

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alexjcgdf
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Joined: 12 Jan 2018
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PostPosted: Wed Apr 14, 2021 16:40    Post subject: IPv6 just stop to work Reply with quote
Hi;

I had just noticed that the IPv6 delegation to my LAN is not working anymore even though no major changes has beeing done on the router configuration.

My ISP is an DHCPv6 with prefix delegations of 64.
I get a IPv6 on my wan interface.
My config on the DNSMasq is:

enable-ra
dhcp-range=::1000,::FFFF,constructor:br0,ra-names,5m
dhcp-option=option6:dns-server,[2001:4860:4860::8888],[2001:4860:4860::8844]
ra-param=br0,10,300
dhcp-option=vendor:MSFT,2,1i
server=2001:4860:4860::8888
server=2001:4860:4860::8844
server=8.8.8.8
server=200.204.0.10

And no device inside is receiving the IPv6 anymore.

what could be happening?

thanks a lot.
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kernel-panic69
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PostPosted: Wed Apr 14, 2021 17:22    Post subject: Reply with quote
I presume this is on your TP-Link TL-WDR4300, but not a clue what build you're running on it. Please provide all applicable information including router model and build number.
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alexjcgdf
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PostPosted: Wed Apr 14, 2021 19:16    Post subject: Reply with quote
kernel-panic69 wrote:
I presume this is on your TP-Link TL-WDR4300, but not a clue what build you're running on it. Please provide all applicable information including router model and build number.


Absolutely let me put all in here:

Router NameDD-WRT
Router ModelNetgear R6700 v3
Firmware VersionDD-WRT v3.0-r42681 std (03/13/20)
Kernel VersionLinux 4.4.216 #1112 SMP Fri Mar 13 12:32:29 +04 2020 armv7l

I have nothing set on the "commands"tab and the SPI is disable at the moment.
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kernel-panic69
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PostPosted: Wed Apr 14, 2021 19:50    Post subject: Reply with quote
Any particular reason you're running a build that's 13 months old? The issue could be tied to older code in the firmware...

https://download1.dd-wrt.com/dd-wrtv2/downloads/betas/2021/04-13-2021-r46329/netgear-r6700v3/
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Wildlion
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PostPosted: Wed Apr 14, 2021 21:33    Post subject: Reply with quote
Are you actually getting the prefix delegation?

Check to make sure that radvd is still working, I have seen that crash.


If you reboot, it takes a little while for the router advertisements to be pass along through ipv6.

When was the last time you noticed it was working...
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alexjcgdf
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PostPosted: Wed Apr 14, 2021 22:53    Post subject: Reply with quote
kernel-panic69 wrote:
Any particular reason you're running a build that's 13 months old? The issue could be tied to older code in the firmware...

https://download1.dd-wrt.com/dd-wrtv2/downloads/betas/2021/04-13-2021-r46329/netgear-r6700v3/


I am using this just because the PPTP connection for VPN is working on that one and was broken for the newer builds. Do you know if that is fixed?

But it was working fine for a while the IPv6 and than just stopped.....
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alexjcgdf
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PostPosted: Wed Apr 14, 2021 22:57    Post subject: Reply with quote
Wildlion wrote:
Are you actually getting the prefix delegation?

Check to make sure that radvd is still working, I have seen that crash.


If you reboot, it takes a little while for the router advertisements to be pass along through ipv6.

When was the last time you noticed it was working...


Yep I am getting the prefix delegation from the ISP. My router receives the IPv6, the only thing is happening is that downstream is not. I am using the DNSMasq for the radvd with the configuration I posted on the first post and disabled on the IPv6 tab page as requested to work with DNSMasq.

I noticed like 1 month ago. Waited for a while and it didn't get back. I made a backup, reinstalled the firmware and pulled the backup config. And even though remains not allocating to the clients....
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Wildlion
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PostPosted: Thu Apr 15, 2021 22:55    Post subject: Reply with quote
so to be honest I have had problems with DNSmasq doing ipv6 on DD-WRT, but not other places...

Here is a reference of getting it setup (on how I did mine):

https://forum.dd-wrt.com/phpBB2/viewtopic.php?p=1220511

otherwise honestly, I do not see anything wrong with your config... but I could be missing it.

Do you know enough to run wireshark and start to monitor for the ipv6 packets?
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kernel-panic69
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PostPosted: Thu Apr 15, 2021 23:53    Post subject: Reply with quote
Well, dnsmasq doesn't handle the IPv6 on DD-WRT, that is something completely separate if I am not mistaken.
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mac913
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PostPosted: Wed Apr 21, 2021 16:58    Post subject: Reply with quote
kernel-panic69 wrote:
Well, dnsmasq doesn't handle the IPv6 on DD-WRT, that is something completely separate if I am not mistaken.


Yes you are mistaken. DNSMasq will handout IPv6 to clients when the ISP has given the IPv6 configured to your Gateway Router.

As Wildlion said, "If you reboot, it takes a little while for the router advertisements to be pass along through ipv6."

I have been with my ISP for a number of years and I would get an IPv6 address on the Gateway Router within a few minutes. But from the being of the Year when I reboot my Gateway Router it now takes 20min to over 4 hours to get the IPv6 configuration from the ISP.

I would reboot the router and wait a fill day (24hours), if still no IPv6 you will need to research on what your ISP has changed.
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Wildlion
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PostPosted: Wed Apr 21, 2021 23:01    Post subject: Reply with quote
mac913 wrote:
kernel-panic69 wrote:
Well, dnsmasq doesn't handle the IPv6 on DD-WRT, that is something completely separate if I am not mistaken.


Yes you are mistaken. DNSMasq will handout IPv6 to clients when the ISP has given the IPv6 configured to your Gateway Router.

As Wildlion said, "If you reboot, it takes a little while for the router advertisements to be pass along through ipv6."

I have been with my ISP for a number of years and I would get an IPv6 address on the Gateway Router within a few minutes. But from the being of the Year when I reboot my Gateway Router it now takes 20min to over 4 hours to get the IPv6 configuration from the ISP.

I would reboot the router and wait a fill day (24hours), if still no IPv6 you will need to research on what your ISP has changed.


that delay is what annoys me some about using IPv6 because I did not want to have a short power drop out or update the router and then have to wait a full day to get back on the net... so I have played with it or select my own and then annoy the ISP Smile until it gets passed out automatically to the full network.

I will actually NAT IPv6 just to make it work faster...

Sorry for the venting
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mac913
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PostPosted: Mon Apr 26, 2021 17:44    Post subject: Reply with quote
Yesterday afternoon I made some configuration changes and rebooted both R7800s...

Rebooted on April 25 at 14:50
ISP IPv6 on April 26 at 08:02

After Reboot it took 17 hours and 52 minutes to get the ISP's IPv6 address setup.
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Home Network on Telus 1Gb PureFibre - 10GbE Copper Backbone
2x R7800 - Gateway & WiFi & 3xWireGuard - DDWRT r53562 Std k4.9
Off Site 1
R7000 - Gateway & WiFi & WireGuard - DDWRT r54517 Std
E3000 - Station Bridge - DDWRT r49626 Mega K4.4
Off Site 2
R7000 - Gateway & WiFi - DDWRT r54517 Std
E2000 - Wired ISP IPTV PVR Blocker - DDWRT r35531

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Per Yngve Berg
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PostPosted: Mon Apr 26, 2021 18:52    Post subject: Reply with quote
I run "dhcp6c eth0" and the address arrives instantly.
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mac913
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PostPosted: Tue Apr 27, 2021 0:40    Post subject: Reply with quote
Per Yngve Berg wrote:
I run "dhcp6c eth0" and the address arrives instantly.


I rebooted the gateway R7800 and ran the command and it gave me 2 instances of dhcp6c and no IPv6. Ran "killall dhcp6c" and ran the original command "dhcp6c -c /tmp/dhcp6c.conf -T LL eth0"

I just have wait "X" hours to get IPv6 back... It's an ISP issue.
_________________
Home Network on Telus 1Gb PureFibre - 10GbE Copper Backbone
2x R7800 - Gateway & WiFi & 3xWireGuard - DDWRT r53562 Std k4.9
Off Site 1
R7000 - Gateway & WiFi & WireGuard - DDWRT r54517 Std
E3000 - Station Bridge - DDWRT r49626 Mega K4.4
Off Site 2
R7000 - Gateway & WiFi - DDWRT r54517 Std
E2000 - Wired ISP IPTV PVR Blocker - DDWRT r35531

YAMon 3.4.6 | DNSCrypt-Proxy V2
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