WAN_DHCP6 pending / unknown and dhcpv6 server not working
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@jimp Thank you for your reply. I'm not using any special settings, although I am probably in the minority of users that depend on "Do not wait for a RA". I'm also using "Request only an IPv6 prefix", with a /56. One other thing that may be of interest is that all of the flags are unset in the RA message from the ISP router. I'm wondering if this is causing there to be no /tmp/hn0_defaultgwv6 file for the IPv6 gateway.
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It is entirely possible it's related to the "do not wait for RA" option. There are not many people who need it, and if the setup doesn't need it, it's not really an accurate test to just check the box and see what happens. There is some code that is duplicated when that option is set and it's possible a change was made to the code path without that option that didn't get mirrored inside that block.
Does it log anything noteworthy in the DHCP log or the system log?
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@jimp Agreed, it's not a valid test to check "Do not wait for a RA" when it's not required. I will take a look at the log of my 2.6.0 system and compare it with the log of the 2.7.0 system. I'm wondering why the file /tmp/hn0_defaultgwv6 is not being created. Does the system use rtsold? If so, I wonder if the M and O flags not being set in the RA are causing a problem. If rtsold is being invoked with scripts to handle M and O, they will not run.
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@jimp There are notable differences in running processes.
Below are the dhcp processes running on 2.6.0:
Lines 1, 6 and 7 are not running on 2.7.0. Also, the dpinger process for the IPv6 gateway is not running. It dies with exiting on signal 15.
Does that help? Let me know if you need any additional information. If you would like to come on my system to take a look, that's easy to arrange.
I'm suspicious about the missing file /tmp/hn0_defaultgwv6. As I mentioned before, the ISP router does not set the M or O flags in the RA message. Could this be causing rtsol to not work properly?
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@jimp said in WAN_DHCP6 pending / unknown and dhcpv6 server not working:
It is entirely possible it's related to the "do not wait for RA" option. There are not many people who need it, and if the setup doesn't need it, it's not really an accurate test to just check the box and see what happens. There is some code that is duplicated when that option is set and it's possible a change was made to the code path without that option that didn't get mirrored inside that block.
Does it log anything noteworthy in the DHCP log or the system log?
I originally thought this might be related to the "do not wait for RA" option, but if that was the problem, IPv6 would not be working at all. The ISP router does not send an RA in response to an RS until after the DHCP solicit has been done. Since IPv6 is working, it must have been done. So there must be some other problem, which I think is related to the missing /tmp/hn0_defaultgwv6 file for the IPv6 gateway.
I can make my hyper-v system available for you or someone else if you want to take a look. I can also send you the packet capture from wireshark.
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@jimp I can see that you're busy with so many developments going on. If there is anything that I can do to help to identify the problem, let me know. If you or someone else from the development team wants to take a look at my system, I just need to know when.
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@bimmerdriver I tried a past development release of 22.05 and had the exact same issue you are experiencing. Traffic flows without any issue but the gateway shows pending. I rolled back when I noticed the issue and haven't tried since.
I also have "Do not wait for a RA" and "Request only an IPv6 prefix" selected.
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@nedyah700 said in WAN_DHCP6 pending / unknown and dhcpv6 server not working:
@bimmerdriver I tried a past development release of 22.05 and had the exact same issue you are experiencing. Traffic flows without any issue but the gateway shows pending. I rolled back when I noticed the issue and haven't tried since.
I also have "Do not wait for a RA" and "Request only an IPv6 prefix" selected.
@bimmerdriver and @jimp I would also add that my Gateway / Monitor IP is an fe80, link-local, address. I swear I remember having this issue a year or so ago and it was resolved with an update.
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@nedyah700 said in WAN_DHCP6 pending / unknown and dhcpv6 server not working:
@nedyah700 said in WAN_DHCP6 pending / unknown and dhcpv6 server not working:
@bimmerdriver I tried a past development release of 22.05 and had the exact same issue you are experiencing. Traffic flows without any issue but the gateway shows pending. I rolled back when I noticed the issue and haven't tried since.
I also have "Do not wait for a RA" and "Request only an IPv6 prefix" selected.
@bimmerdriver and @jimp I would also add that my Gateway / Monitor IP is an fe80, link-local, address. I swear I remember having this issue a year or so ago and it was resolved with an update.
In my situation, it has always been the case the gateway address is a link-local address. That does not cause a problem on 2.6.0 and it didn't cause a problem on 2.7.0 up to the point where this regression was introduced. As I pointed out above, I think this problem is related to the missing file /tmp/hn0_defaultgwv6.
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I created a new bug in redmine, https://redmine.pfsense.org/issues/13238.
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I think I've spotted the problem here. In #6880 the scripts were changed around a bit and the withoutra path isn't getting the script header that should be setting the router file(s).
Try the attached patch and see if it helps for you.
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The fix on #13238 fixed the gateway with "do not wait for RA"
The DHCPv6 daemon not running was a regression from https://redmine.pfsense.org/issues/12527 and it wasn't related to "do not wait for RA".
The attached patch here should fix the DHCPv6 daemon problem. It worked for me in my lab on several systems.
Fixes for both are going to be in 22.05.
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@jimp Thank you! I haven't had a chance to try yet but I will in the next day or so if I can. Thanks again for your help!
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@jimp said in WAN_DHCP6 pending / unknown and dhcpv6 server not working:
The fix on #13238 fixed the gateway with "do not wait for RA"
The DHCPv6 daemon not running was a regression from https://redmine.pfsense.org/issues/12527 and it wasn't related to "do not wait for RA".
The attached patch here should fix the DHCPv6 daemon problem. It worked for me in my lab on several systems.
Fixes for both are going to be in 22.05.
I installed the second patch and I can confirm that it fixes the dhcpv6 problem.
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@jimp I backed out both patches, then upgraded to the latest snapshot. Pleased to report that both issues are resolved. Thank you very much.
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Wondering if those recent changes could somehow be related to rtsold not running, IPv6 WAN (DHCP) keeps losing connectivity
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@luckman212 What version are you on? I believe this issue was specific to 22.05 / 2.7.0
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@nedyah700 I'm on the latest 22.05 RC snapshot: 22.05.r.20220614.1944
