Dear Ubuntu team,

this fix does NOT work within linux-image-extra-3.19.0-21-generic and does NOT work within linux-image-3.19.8-031908-generic. Something strange happens, if enabling the wlan1 interface with the network-manager gui: The kernel variable /proc/sys/net/ipv6/conf/wlan1/hop_limit gets zero after connecting to a configured wlan. IPV6 is not working, because of hop limitation, only a link local default gateway is set.

Maybe several other packages are involved, but I can not fiddle it out.

system info:
ubuntu vivid
Linux laptop-stefan 3.19.8-031908-generic #201505110938 SMP Mon May 11 13:39:59 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

lsmod
Module                  Size  Used by
ctr                    13193  3 
ccm                    17856  3 
xt_CHECKSUM            12549  1 
iptable_mangle         12734  1 
ipt_MASQUERADE         12678  3 
nf_nat_masquerade_ipv4    13412  1 ipt_MASQUERADE
iptable_nat            12875  1 
nf_nat_ipv4            14267  1 iptable_nat
nf_nat                 26308  2 nf_nat_ipv4,nf_nat_masquerade_ipv4
nf_conntrack_ipv4      18953  2 
nf_defrag_ipv4         12758  1 nf_conntrack_ipv4
xt_conntrack           12760  1 
nf_conntrack          105683  5 nf_nat,nf_nat_ipv4,xt_conntrack,nf_nat_masquerade_ipv4,nf_conntrack_ipv4
ipt_REJECT             12541  2 
nf_reject_ipv4         13183  1 ipt_REJECT
xt_tcpudp              12924  6 
bridge                114479  0 
stp                    12976  1 bridge
llc                    14441  2 stp,bridge
ebtable_filter         12827  0 
ebtables               35359  1 ebtable_filter
ip6table_filter        12815  0 
ip6_tables             27504  1 ip6table_filter
iptable_filter         12810  1 
ip_tables              27718  3 iptable_filter,iptable_mangle,iptable_nat
x_tables               34103  11 ip6table_filter,xt_CHECKSUM,ip_tables,xt_tcpudp,ipt_MASQUERADE,xt_conntrack,iptable_filter,ebtables,ipt_REJECT,iptable_mangle,ip6_tables
xfrm_user              36115  2 
xfrm4_tunnel           12857  0 
tunnel4                13252  1 xfrm4_tunnel
ipcomp                 12790  0 
xfrm_ipcomp            13606  1 ipcomp
esp4                   17175  0 
ah4                    17133  0 
af_key                 36492  0 
xfrm_algo              15394  5 ah4,esp4,af_key,xfrm_user,xfrm_ipcomp
binfmt_misc            18163  1 
zram                   24692  0 
lz4_compress           12529  1 zram
snd_hda_codec_analog    19240  1 
snd_hda_codec_generic    70069  1 snd_hda_codec_analog
arc4                   12573  2 
iwl3945                74519  0 
pcmcia                 62760  0 
snd_hda_intel          30775  3 
iwlegacy              105101  1 iwl3945
snd_hda_controller     35493  1 snd_hda_intel
snd_hda_codec         144641  4 snd_hda_codec_generic,snd_hda_intel,snd_hda_controller,snd_hda_codec_analog
coretemp               13638  0 
mac80211              751896  2 iwl3945,iwlegacy
snd_hwdep              17709  1 snd_hda_codec
snd_pcm               106401  3 snd_hda_codec,snd_hda_intel,snd_hda_controller
joydev                 17538  0 
thinkpad_acpi          86562  0 
i915                 1087204  2 
nvram                  14413  1 thinkpad_acpi
lpc_ich                21176  0 
serio_raw              13434  0 
cfg80211              551242  3 iwl3945,iwlegacy,mac80211
snd_seq_midi           13564  0 
snd_seq_midi_event     14899  1 snd_seq_midi
yenta_socket           45447  0 
snd_rawmidi            31148  1 snd_seq_midi
pcmcia_rsrc            18591  1 yenta_socket
pcmcia_core            23715  3 pcmcia,pcmcia_rsrc,yenta_socket
snd_seq                63540  2 snd_seq_midi_event,snd_seq_midi
nsc_ircc               29832  0 
drm_kms_helper        123797  1 i915
snd_seq_device         14875  3 snd_seq,snd_rawmidi,snd_seq_midi
snd_timer              30069  2 snd_pcm,snd_seq
irda                  203831  1 nsc_ircc
drm                   341489  4 i915,drm_kms_helper
snd                    83976  17 snd_hwdep,snd_timer,snd_pcm,snd_seq,snd_rawmidi,snd_hda_codec_generic,snd_hda_codec,snd_hda_intel,thinkpad_acpi,snd_seq_device,snd_hda_codec_analog
8250_fintek            12924  0 
crc_ccitt              12707  1 irda
soundcore              15091  2 snd,snd_hda_codec
shpchp                 37216  0 
i2c_algo_bit           13564  1 i915
video                  24803  1 i915
mac_hid                13275  0 
parport_pc             32909  0 
ppdev                  17711  0 
sunrpc                334694  1 
lp                     17799  0 
parport                42432  3 lp,ppdev,parport_pc
autofs4                39306  2 
pata_acpi              13053  0 
psmouse               118539  0 
ahci                   34220  2 
libahci                32353  1 ahci
e1000e                230013  0 
ptp                    19534  1 e1000e
pps_core               19332  1 ptp

Please fix!