Sponsored Links

IPv6 and OpenWRT: Any tips + Community Fibre claims to delegate only /64?

strideynet

Casual Member
I've read through a few of the threads here - and am at wits end.

I've been a CF customer for 2-3 years but only renewed my contract last week ( meaning I'm now enrolled in CGNAT... - which has prompted me to investigate my IPv6 connectivity.)

IPv4 connectivity is working fine.

I'm operating a WRT1900ACSv2 flashed with OpenWRT - this has been the same router in use for 2 or so years but I don't recall if IPv6 worked before renewing my contract.

In terms of IPv6, the ICMPv6 router solicitation and announcement seems to work correctly, but my router receives no response when sending the DHCPv6 solicitation to start the process of receiving a delegated prefix. (See TCPDump here: https://gist.github.com/strideynet/e5f9ef1ae503267628d18dc454a6e09b)

I reached out to Community Fibre to check if I should expect to receive a delegated prefix and if so, what size, and was puzzled to be informed they only delegate a /64 (contrary to what I've read here!) which is quite disappointing:
1695281929486.png


I then rang them up, since a few of you on here have suggested asking them to clear the registered MAC address, this supposedly took place but after an ONT/Modem restart I still do not receive a DHCPv6 response with a prefix delegation.

If anyone has any further suggestions or things they had to configure to get this working (especially OpenWRT users) - that would be appreciated ! I've wasted a day on this already and am close to just giving up.
 
Aha ! I cracked it, I had to use a DUID LLT rather than a DUID LL - weirdly a DUID LLT with a timestamp of 0 works but hey hoh.

My current OpenWRT config for anyone curious:

config interface 'wan6'
option device 'wan'
option proto 'dhcpv6'
option reqaddress 'none'
option reqprefix 'auto'
option clientid '000100010000000034430320D4D6'

The last part of the clientid is the MAC of the interface.


I then received a /48 - clearly there was some miscommunication between the networking team and support.
 
Yeah, don't bet on CF's abismal customer support for anything technical. However, It's unusual that you need Client ID for IPv6-DP from WAN as mine was issued straight away with the default settings on my openwrt router (wan6 is an alias interface of wan set up as dhcpv6 client)
 
Sponsored Links
According to OPNsense I receive a /56 (1Gb, CGNAT on IPv4). I've no reason to doubt its wrong because nothing will work if I set it to anything else!
 
Top
Cheapest Superfast ISPs
  • Hyperoptic £17.99
    Speed 33Mbps, Unlimited
    Gift: None
  • UtilityWarehouse £19.99
    Speed 35Mbps, Unlimited (FUP)
    Gift: None
  • NOW £23.00
    Speed 63Mbps, Unlimited
    Gift: None
  • Vodafone £24.00
    Speed 73 - 82Mbps, Unlimited
    Gift: None
  • Shell Energy £24.99
    Speed 38Mbps, Unlimited
    Gift: None
Large Availability | View All
Cheapest Ultrafast ISPs
  • Gigaclear £17.00
    Speed: 200Mbps, Unlimited
    Gift: None
  • Zzoomm £19.95
    Speed: 150Mbps, Unlimited
    Gift: None
  • YouFibre £19.99
    Speed: 150Mbps, Unlimited
    Gift: None
  • Community Fibre £20.00
    Speed: 150Mbps, Unlimited
    Gift: None
  • BeFibre £21.00
    Speed: 150Mbps, Unlimited
    Gift: £25 Love2Shop Card
Large Availability | View All
Helpful ISP Guides and Tips
»
»
»
»
»
»
»
»
»
»
»
»
»
»
»
»
»
»
»
»
»
»
»
»
»
»
»
Sponsored Links
The Top 20 Category Tags
  1. FTTP (5385)
  2. BT (3490)
  3. Politics (2494)
  4. Openreach (2275)
  5. Business (2221)
  6. Building Digital UK (2215)
  7. FTTC (2038)
  8. Mobile Broadband (1940)
  9. Statistics (1763)
  10. 4G (1639)
  11. Virgin Media (1589)
  12. Ofcom Regulation (1438)
  13. FTTH (1379)
  14. Wireless Internet (1378)
  15. Fibre Optic (1375)
  16. 5G (1215)
  17. Vodafone (1126)
  18. EE (1111)
  19. TalkTalk (927)
  20. O2 (914)
Sponsored

Copyright © 1999 to Present - ISPreview.co.uk - All Rights Reserved - Terms  ,  Privacy and Cookie Policy  ,  Links  ,  Website Rules