Lit Fibre (UK) IPv6 stopped after powercut

F022Y

It was ISP based, due to merging networks with their new owners CityFibre.

I do appreciate the assist.

F022Y

It died again, this time no IPv6 at all

packetcapture-igc0-20250318162548.pcap

JKnott

@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.

F022Y

Just logged back into pfsense after grabbing that pcap and the interface shows connections.

JKnott

@F022Y

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.

F022Y

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?

JKnott

@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?

JKnott

@F022Y

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.

F022Y

@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.pcap

Capture the WAN port
packetcapture-igc1-20250318211922.pcap

JKnott

@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.

F022Y

@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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