ip switching from ipv4 to ipv6

[Eric Vyncke (evyncke)]

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.com at lists.cluenet.de on
behalf of re" <ipv6-ops-bounces+evyncke=cisco.com at lists.cluenet.de on
behalf of re-tech at 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--