On 16/06/2021 10:36, Andrei Borzenkov wrote:
SLAAC is used by your own system, not ISP. ISP sends RA. Your system uses SLAAC to build address using these RA. You yourself said they are present (you mentioned M an O flags).
SLAAC is only supposed to be performed if the RA's M flag is not set. I don't think I've ever seen an ISP offering IPv6 without setting the M flag. When the M flag is set, the client is expected to use DHCPv6 instead of SLAAC.
Do you mean these RAs do not contain any valid prefix?
Correct, they do not contain a prefix and set the M flag. -- - Steve Hill Technical Director | Cyfarwyddwr Technegol Opendium Online Safety & Web Filtering http://www.opendium.com Diogelwch Ar-Lein a Hidlo Gwefan Enquiries | Ymholiadau: sales opendium com +44-1792-824568 Support | Cefnogi: support 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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