I'm trying to get to grips with IPv6-PD over PPPoE.
I'm on CentOS 8 (NetworkManager 1.30) and have main.dhcp=dhclient. My PPPoE connection is set to ipv6.method=auto.
With no NICs set to ipv6.manual=shared, I can see from a traffic dump that: - PPP link comes up and assigns IPv4 through LCP. - I send an IPv6 router solicitation to my ISP.- ISP responds with a router advertisement, which has the "managed address configuration" and "other configuration" flags set.
- I send DHCPv6 Solicit with an IA_NA option.- ISP responds with a DHCPv6 Advertise, which does NOT contain an IPv6 address.
I end up with an IPv6 default route pointing at the PPP interface, but no public IPv6. IPv6 traffic from me to a public address ends up with my link-local address as the source, which is obviously broken.
Conversely, with one or more NICs set to ipv6.method=shared (even if its only a dummy NIC), I get:
- PPP link comes up and assigns IPv4 through LCP. - I send an IPv6 router solicitation to my ISP.- ISP responds with a router advertisement, which has the "managed address configuration" and "other configuration" flags set.
- I send DHCPv6 Solicit with IA_NA and IA_PD options.- ISP responds with a DHCPv6 Advertise, which does NOT contain an IPv6 address, but does contain my /48 public prefix.
Again, the PPP NIC ends up with no public address, but now the "shared" NIC gets a public v6 address. IPv6 traffic from me to a public address ends up with the "ipv6.method=shared" NIC's address as the source, as this is the only public v6 address available.
Is my ISP behaving in a broken way, by not assigning me an address in response to IA_NA, or is it standard behaviour for ISPs to only respond to IA_PD requests?
It feels as though NetworkManager should always be making both IA_NA and IA_PD requests and, if it didn't receive an IA_NA response from the ISP, it should assign an address from the delegated prefix to the PPP interface. This would prevent the situation where a machine with no "ipv6.method=shared" NICs ends up with no public v6 address at all.
Any insight would be appreciated - many thanks. :) -- - Steve Hill Technical Director | Cyfarwyddwr Technegol Opendium Online Safety & Web Filtering http://www.opendium.com Diogelwch Ar-Lein a Hidlo Gwefan Enquiries | Ymholiadau: sa...@opendium.com +44-1792-824568 Support | Cefnogi: supp...@opendium.com +44-1792-825748 ------------------------------------------------------------------------ Opendium Limited is a company registered in England and Wales. Mae Opendium Limited yn gwmni sydd wedi'i gofrestru yn Lloegr a Chymru. Company No. | Rhif Cwmni: 5465437 Highfield House, 1 Brue Close, Bruton, Somerset, BA10 0HY, England.
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