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By default, IPv6 is disabled when using PPP. This is because the file /etc/ppp/options is as follows:

lock

For IPv6 to work, /etc/ppp/options should be as follows:

lock
ipv6 ,

Note the space and the comma after "ipv6".

Version-Release number of selected component (if applicable): ppp-2.4.5-5.el6.x86_64

Reproducible: Always.

This request was evaluated by Red Hat Product Management for
inclusion in the current release of Red Hat Enterprise Linux.
Because the affected component is not scheduled to be updated
in the current release, Red Hat is unable to address this
request at this time.

Red Hat invites you to ask your support representative to
propose this request, if appropriate, in the next release of
Red Hat Enterprise Linux.

I'm not against such change, but I don't know if ppp is going to be scheduled for update in next maintenance release. Therefore it will be more helpful to file this bug against Fedora. After we resolve issue in Fedora we can easily backport this change to RHEL, if requested and approved by PM.

I cloned the bug against rawhide as #923356 and I am closing this one as WONTFIX.