This issue may be resolved by providing a newer version of
networkmanager (= 0.9.10.2)
In this version a patch was introduced to mitigate CVE-2015-2922 (don't allow
setting the HL smaller than it was before)
This patch also makes sure a HL 10 does not get set.
[ 1 ] The changelog of version
This bug is due to a failure in handling router advertisments.
According to RFC 4861 (page 20) a _Cur Hop Limit_ set to 0 means, that
the Hop Limit is unspecified. Ubuntu 15.04 takes this literally and sets
HL to 0.
Fortunately my router provided the option to set this field to a manual
value,
