Lit Fibre (UK) IPv6 stopped after powercut
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Firstly thank you for the repies. So i am at a complete loss on this as I rebooted to do a packet capture and now IPv6 works like a charm.
But in case it helps i'll attach the pcaps etc.
packetcapture-igc0-20250316134737.pcap
I do have KEA for IPv4 addresses but not for IPv6 as that interface is set to track on the WAN.
As i say though after a boot she's happy again.
Thank you all again
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@F022Y said in Lit Fibre (UK) IPv6 stopped after powercut:
But in case it helps i'll attach the pcaps etc.
I see you didn't follow my directions. Instead of just the DHCP6 stuff, that file includes a lot of irrelevant stuff.
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Apologies i followed this:-
The pfsense box is down next to the ONT so by the time i got down and back up my PC had fallen asleep so assume UDP part was cleared
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@F022Y said in Lit Fibre (UK) IPv6 stopped after powercut:
Apologies i followed this:-
Including the instructions about the UDP port to filter on? By filtering on UDP port 546 or 547, doesn't matter which, you would have captured only the DHCPv6 packets.
Here's one I did a while ago. You'll see it contains only the 4 DHCPv6 packets and nothing else.
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So spoke to soon as it stopped again after scheduled maintence at 2am UTC today so ran through the advise you guys gave again.
Again after halting the system removing WAN cable booting up setting the following:-
Upon plugging the WAN cable back in IPv6 works again, as i'm in the middle of CDM upgrades on a rubrik cluster can't spend to much time poking.
Going to leave it overnight to check as another maintenance and see what happens.
@JKnott I know what i did wrong last time and will make sure not to repeat, now i assume the captured port is WAN? Just want to double check.
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@F022Y said in Lit Fibre (UK) IPv6 stopped after powercut:
I know what i did wrong last time and will make sure not to repeat, now i assume the captured port is WAN? Just want to double check.
Yes, that is correct. When you filter on those UDP ports, you will have 4 packets captured. You can look at the capture file with Wireshark, as I demonstrated with a screen capture.
Was that scheduled maintenance yours or your ISPs?
BTW, DHCP6 works exactly like DHCP4, with the solicit, advertise, request and reply packets. However, once that's completed, then the LAN prefix has to be obtained from the reply packet and applied to the LAN. There is nothing comparable to that in IPv4.
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It was ISP based, due to merging networks with their new owners CityFibre.
I do appreciate the assist.
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It died again, this time no IPv6 at all
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@F022Y said in Lit Fibre (UK) IPv6 stopped after powercut:
about 2 hours ago
It died again, this time no IPv6 at all
Here's what the reply packet shows:
The IA address should be the WAN interface address and the prefix address is your LAN prefix. Are you saying you're not seeing either of those? I also see you're getting a /48 prefix size. Nice you can get one that big. I only have a /56.
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Just logged back into pfsense after grabbing that pcap and the interface shows connections.
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Are you seeing the IPv6 pings leave your network? Perhaps there's a routing issue from your ISP. You can see the pings in packet capture, by filtering on ICMP6. You should see both the request and reply in the capture. What happens if you ping something closer than netgate? One thing you can do is traceroute to netgate or other and see how far it goes. Given the ISP is doing stuff, bad routes are a definite possibility.
You might also try this by tethering to a cell phone and seeing if you get the same results there. If the cell connection works, you can see if your pings can reach it from your Lit Fibre connection. You may want to use Wireshark on the computer tethered to the phone.
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Nope nothing.
packetcapture-igc0-20250318201715.pcap
Looks like my 3 cell connection doesn't support IPv6 so unable to test like that.
I am right with the LAN config tho, with it being tracked to the WAN?
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@F022Y said in Lit Fibre (UK) IPv6 stopped after powercut:
Looks like my 3 cell connection doesn't support IPv6 so unable to test like that.
????
IPv6 is mandatory for 4G & 5G, though some companies do a poor job with it for tethered devices. What happens if you do that IPv6 test from the phone?
PfSense running on Qotom mini PC
i5 CPU, 4 GB memory, 32 GB SSD & 4 Intel Gb Ethernet ports.
UniFi AC-Lite access pointI haven't lost my mind. It's around here...somewhere...
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That packet capture shows you're pinging a link local address:
Are you pinging the ISPs MAC on the WAN interface? Or something on your local LAN? Link local packets do not pass through a router, so it has to be something directly connected to whichever network you're on.
In that traceroute, I see 4 successful hops, then nothing. This could indicate a routing problem beyond that last one.
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@JKnott android on 4G and any attempts to ping or routetrace bbc.co.uk it defaults to IPv4.
Address i'm pinging is either bbc or netgate i'll do another now pinging bbc.co.uk...........
Just for giggles i've done 2 for comparison.
Capture the LAN port
packetcapture-igc0-20250318212104.pcapCapture the WAN port
packetcapture-igc1-20250318211922.pcap -
@F022Y said in Lit Fibre (UK) IPv6 stopped after powercut:
android on 4G and any attempts to ping or routetrace bbc.co.uk it defaults to IPv4.
Try test-ipv6.com. You should have IPv6 with 4G. However, your cell company may be preventing tethering from working.
Also, you should be trying this when connected to the cell network and not your WiFi, as the pfSense problem would affect it too.
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@JKnott just tested, WiFi off and still not playing
Image doesn't want to appear so I'll share when back on desktop.
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Wow, that's imho quiet unique : an Phone 4G/5G ISP without IPv6 ... ?
What does this mean :
as I always considered that "test-ipv6.com" is clean and exempt of publicity or other stiff.
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@Gertjan it's brave browser so the left icon is that the the inbuilt "shields" are active the right one is Brave rewards.
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Yeah, get that
And why the red triangle with the warning ?
"test-ipv6.com is script based, and the script ... tests the IPv6 capabilities. If something failed, it shows you are IPv4 only, and maybe this isn't the case.I find it still hard to believe yo use a phone connection without IPv6 ... There are no free
IPv6IPv4 ! left, no where, and people didn't stop buying phones, so IPv6 isn't really an option these days.Are you sure IPv6 isn't disabled in your phone ? Just asking, as I don't recognize what phone OS you are using, it doesn't look like mine.
