IPv6 with two or more LAN-side interfaces
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First, find out what your ISP provides. Did you check /var/log/dhcpd.log as @jimp suggested? In it, you will see something like:
Feb 12 09:19:18 firewall dhcp6c[18217]: <3>[prefix] (6)
Feb 12 09:19:18 firewall dhcp6c[18217]: <3>[::] (2)
Feb 12 09:19:18 firewall dhcp6c[18217]: <3>[/] (1)
Feb 12 09:19:18 firewall dhcp6c[18217]: <3>[56] (2)
Feb 12 09:19:18 firewall dhcp6c[18217]: <3>[infinity] (8)
Feb 12 09:19:18 firewall dhcp6c[18217]: <3>end of sentence [;] (1)The 56 above is my prefix length.
You might also mention your ISP, so that someone else here might offer advice.
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@JKnott Nothing like this in the logs.
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You have Start DHCP6 client in debug mode enbled on the WAN interface ?
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@NogBadTheBad Not till now, will give it a try.
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@Bob-Dig said in IPv6 with two or more LAN-side interfaces:
@NogBadTheBad Not till now, will give it a try.
Just a thought, not sure if it will give you the answer you need.
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@NogBadTheBad Looks like it:
Feb 14 17:01:41 pfSense dhcp6c[73783]: get DHCP option IA_PD, len 41 Feb 14 17:01:41 pfSense dhcp6c[73783]: IA_PD: ID=0, T1=302400, T2=483840 Feb 14 17:01:41 pfSense dhcp6c[73783]: get DHCP option IA_PD prefix, len 25 Feb 14 17:01:41 pfSense dhcp6c[73783]: IA_PD prefix: 2a02:xxxx:xxxx:xxxx::/64 pltime=604800 vltime=1209600 Feb 14 17:01:41 pfSense dhcp6c[73783]: get DHCP option preference, len 1 -
Might want to hide part of the IPv6 address.
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So is there any option left with that ISP-IPv6 or no?
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What lengths did you try? Only 64, 63, and 60? You should at least try some other common ones: 56, 48, etc. before ruling them out.
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@jimp Ok, tried them now, not working.
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@Bob-Dig said in IPv6 with two or more LAN-side interfaces:
So is there any option left with that ISP-IPv6 or no?
You could try mentioning what ISP that is. There might be someone here who has experience with them.
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Well, it's hard to know what to believe, when you won't mention who the ISP is. If all you get is a single /64, then you can't do much, as both SLAAC and DHCPv6 require a full /64 to work properly. One option would be to use he.net for a 6in4 tunnel.
They provide a /48. -
Interesting, never thought something like that with all the IPv6-addresses we got, little that I know.
The ISP is
https://www.pyur.com/Thanks @ all
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@JKnott said in IPv6 with two or more LAN-side interfaces:
Or, if you're handy with Packet Capture and Wireshark, you can see what is provided. The prefix size and address are provided in both the Advertise XID and Reply XID lines.
Could you help me with that? I have downloaded Wireshark and also captured something and then loaded it in Wireshark.
But what should I capture in the first place and how to look for it in Wireshark would be much appreciated.
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To capture with Wireshark, you need some way to insert a computer running it between the modem and the pfSense computer. This is can be done with a managed switch, configured for port mirroring. Failing that, you can use the Packet Capture that's built in to pfSense. You can then capture the packets when you disconnect/reconnect the WAN port. You can then download the capture to view in Wireshark. If you use a managed switch, you can capture everything from power up, instead of just disconnecting the WAN port. You want to filter on DHCPv6, which is port 546 or 547. You can use either. That should leave you with the XID packets, which you can then open and find the info.
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@JKnott So is that it? Or is it not?
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@JKnott Just to be sure, this is what my ISP is giving out or what I asked for? I want to be absolute sure about this once and for all.
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I see your prefix length is 64, which means you get a single /64. My length is 56, which leaves room for 256 /64s.
Can your ISP provide a better prefix? As I mentoned, I have a /56, but other ISPs provide a /60 for 16 /64s or a /48, for 65536.
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@JKnott Thank you.
No, as far I can tell, my ISP is not changing that. Could you call comcast and ask for a larger prefix? Sure you could, but it would took ages to get someone on the phone who is even capable of understanding it. I am almost not.Thanks again and I replaced the picture.
