See also https://tools.ietf.org/html/draft-vyncke-v6ops-happy-eyeballs-cookie-01
Kind of a well-known problem when "naive" applications/CMS/middleware trust an IP address to protect cookies -éric On 29/04/16 14:46, "ipv6-ops-bounces+evyncke=cisco....@lists.cluenet.de on behalf of re" <ipv6-ops-bounces+evyncke=cisco....@lists.cluenet.de on behalf of re-t...@mur.at> wrote: >dear ipv6-ops list members, > >one of our users is unable to login to webmail, because the ip address is >changing during session. this problem isnt that unusual, but after a check >in the logfiles i realized its switching from ipv4 to ipv6 and so on, >(see below). > >is this phenomenon known? >is it us or the deutsche telekom who is causing the problem? > >thanks in advance, >re - noc.mur.at > >##### > >Apr 29 09:54:34 dovecot: imap-login: Login: user=<>, method=PLAIN, >rip=217.233.160.66 > >Apr 29 09:57:54 dovecot: imap-login: Login: user=<>, method=PLAIN, >rip=2003:88:6c55:4707:b538:efe9:d4fb:bdf7 > >Apr 29 10:05:17 dovecot: imap-login: Login: user=<>, method=PLAIN, >rip=217.233.160.66 > >Apr 29 10:05:19 dovecot: imap-login: Login: user=<>, method=PLAIN, >rip=2003:88:6c55:4707:b538:efe9:d4fb:bdf7 > >Apr 29 11:29:03 dovecot: imap-login: Login: user=<>, method=PLAIN, >rip=217.233.160.66 > >Apr 29 11:45:09 dovecot: imap-login: Login: user=<>, method=PLAIN, >rip=2003:88:6c55:4707:b538:efe9:d4fb:bdf7 > >-- >--mur.at leitnergasse 7-12 8010 graz--