Small business may have a small routed network (a few router hops), There is no mechanism to propagate PA address withdrawal through a few hops.
By the way, it should not be RA lifetime because router may have a few connections to ISPs, not all down at the same time. It should be PIO (specific prefix) on the last hop. Eduard > -----Original Message----- > From: Niels Bakker via NANOG <[email protected]> > Sent: Thursday, June 18, 2026 16:22 > To: [email protected] > Cc: Niels Bakker <[email protected]> > Subject: Re: IPv4 flag day > > * Matthew Petach [Wed 17 Jun 2026, 03:24 CEST]: > >Unfortunately, there's nothing that tells the downstream host "hey, > >stop using that address as a source address for connections". > > 0 lifetime RAs. > > > -- Niels. > > -- > _______________________________________________ > NANOG mailing list > https://lists.nanog.org/archives/list/[email protected]/message/YSMCSCI > WCKRYITLTGQ6PJAOL5QCIMXK2/ _______________________________________________ NANOG mailing list https://lists.nanog.org/archives/list/[email protected]/message/2DE2NJDDSK7XXPDYBLRTZZNV5H3F3A2J/
