Fresh install of 18.3, but no ipv6 connectivity (altough it's configured)

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RoFz
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Joined: Thu Jun 07, 2018 9:11 am

Fresh install of 18.3, but no ipv6 connectivity (altough it's configured)

Post by RoFz » Thu Jun 07, 2018 9:45 am

Hello,

we provide IT services to business customers and we are currently evaluating Linux as a desktop platform. Our internal network already works with dynamic /64 IPv6 prefixes provided by our ISP. We also use internally an ULA prefix (fd0). Windows clients and servers, as well as other Linux distributions work fine with IPv6, but we are still trying to achieve this same level of success with IPv6 in Linux Mint.

It happens that, although the Mint device is fully configured with IPv6 (link-local, temp and public addresses received via RA and our internal ULA prefix), absolutely no traffic leaves the cabled or the wireless interfaces. The funny thing is that I can see incoming router advertisements on the interfaces, but nothing goes out, not even a ping6 to the default gateway.

I am currently looking if some default behavior was changed in these apps/systems:

1) selinux
2) sysctl and disabled ipv6 kernel features
3) NetworkManager

Please remember that this is a fresh install of LM 18.3.

Any insights?

---

Here is my info:

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NB000854 ~ # ifconfig 
enp9s0    Link encap:Ethernet  HWaddr <omitted>  
          inet addr:10.250.0.168  Bcast:10.250.0.255  Mask:255.255.255.0
          inet6 addr: fd1c:<omitted>/64 Scope:Global
          inet6 addr: 2804:<omitted>/64 Scope:Global
          inet6 addr: fd1c:<omitted>/64 Scope:Global
          inet6 addr: 2804:<omitted>/64 Scope:Global
          inet6 addr: fe80::1716:7110:4333:b8a8/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:86726 errors:0 dropped:0 overruns:0 frame:0
          TX packets:54209 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:87832690 (87.8 MB)  TX bytes:5435392 (5.4 MB)
          Interrupt:17 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:1561 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1561 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:181356 (181.3 KB)  TX bytes:181356 (181.3 KB)

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NB000854 ~ # route -6 -n
Kernel IPv6 routing table
Destination                    Next Hop                   Flag Met Ref Use If
2804:<omitted>::/64        ::                         Ue   256 0     0 enp9s0
fd1c:<omitted>::/64        ::                         Ue   256 2    63 enp9s0
fe80::/64                      ::                         U    256 2  1882 enp9s0
::/0                           fe80::c225:e9ff:fe56:5950  UG   100 0     0 enp9s0
::/0                           ::                         !n   -1  1  2794 lo
::1/128                        ::                         Un   0   2     4 lo
2804:<omitted>/128 ::                         Un   0   3   162 lo
2804:<omitted>/128 ::                         Un   0   1     0 lo
fd1c:<omitted>/128 ::                         Un   0   3   189 lo
fd1c:<omitted>/128 ::                         Un   0   1     0 lo
fe80::1716:7110:4333:b8a8/128  ::                         Un   0   3   954 lo
ff00::/8                       ::                         U    256 0     0 wlp12s0
ff00::/8                       ::                         U    256 2   561 enp9s0
::/0      
tcpdump output:

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10:37:54.444370 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, echo request, seq 1721, length 64
10:37:54.568363 IP6 fd1c:a9b1:8c4d:f2f:39a1:d5c8:4717:a7d0 > ff02::1:ff00:10: ICMP6, neighbor solicitation, who has fd1c:a9b1:8c4d:f2f::10, length 32
10:37:55.464347 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, echo request, seq 1722, length 64
10:37:55.592468 IP6 fd1c:a9b1:8c4d:f2f:39a1:d5c8:4717:a7d0 > ff02::1:ff00:10: ICMP6, neighbor solicitation, who has fd1c:a9b1:8c4d:f2f::10, length 32
10:37:56.488339 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, echo request, seq 1723, length 64
10:37:57.512586 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, echo request, seq 1724, length 64
10:37:58.536766 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, echo request, seq 1725, length 64
10:37:59.564286 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, echo request, seq 1726, length 64
10:37:59.688437 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, neighbor solicitation, who has fe80::c225:e9ff:fe56:5950, length 32
10:38:00.584521 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, echo request, seq 1727, length 64
10:38:00.712271 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, neighbor solicitation, who has fe80::c225:e9ff:fe56:5950, length 32
10:38:01.608332 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, echo request, seq 1728, length 64
10:38:01.736278 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, neighbor solicitation, who has fe80::c225:e9ff:fe56:5950, length 32
10:38:02.198508 IP6 fe80::c225:e9ff:fe56:5950 > ip6-allnodes: ICMP6, router advertisement, length 128
10:38:02.632552 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, echo request, seq 1729, length 64
10:38:03.656402 IP6 fe80::1716:7110:4333:b8a8 > ff02::1:ff56:5950: ICMP6, neighbor solicitation, who has fe80::c225:e9ff:fe56:5950, length 32
10:38:04.680287 IP6 fe80::1716:7110:4333:b8a8 > ff02::1:ff56:5950: ICMP6, neighbor solicitation, who has fe80::c225:e9ff:fe56:5950, length 32
10:38:05.317071 IP6 fe80::c225:e9ff:fe56:5950 > ip6-allnodes: ICMP6, router advertisement, length 128
10:38:05.317146 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, echo request, seq 1730, length 64
10:38:05.317157 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, echo request, seq 1731, length 64
10:38:05.704510 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, echo request, seq 1732, length 64
10:38:06.728526 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, echo request, seq 1733, length 64
10:38:07.752557 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, echo request, seq 1734, length 64
10:38:08.776544 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, echo request, seq 1735, length 64
10:38:09.439562 IP6 fe80::c225:e9ff:fe56:5950 > ip6-allnodes: ICMP6, router advertisement, length 128
10:38:09.800498 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, echo request, seq 1736, length 64
10:38:10.440277 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, neighbor solicitation, who has fe80::c225:e9ff:fe56:5950, length 32
10:38:10.824359 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, echo request, seq 1737, length 64
10:38:11.464252 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, neighbor solicitation, who has fe80::c225:e9ff:fe56:5950, length 32
10:38:11.848330 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, echo request, seq 1738, length 64
10:38:12.488246 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, neighbor solicitation, who has fe80::c225:e9ff:fe56:5950, length 32
10:38:12.872541 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, echo request, seq 1739, length 64
10:38:13.896386 IP6 fe80::1716:7110:4333:b8a8 > ff02::1:ff56:5950: ICMP6, neighbor solicitation, who has fe80::c225:e9ff:fe56:5950, length 32
10:38:14.733522 IP6 fe80::c225:e9ff:fe56:5950 > ip6-allnodes: ICMP6, router advertisement, length 128
10:38:14.733600 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, echo request, seq 1740, length 64
10:38:14.920400 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, echo request, seq 1741, length 64
10:38:15.944466 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, echo request, seq 1742, length 64
10:38:16.968495 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, echo request, seq 1743, length 64
10:38:17.851657 IP6 fe80::c225:e9ff:fe56:5950 > ip6-allnodes: ICMP6, router advertisement, length 128
10:38:17.992313 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, echo request, seq 1744, length 64
10:38:19.016564 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, echo request, seq 1745, length 64
10:38:19.912261 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, neighbor solicitation, who has fe80::c225:e9ff:fe56:5950, length 32
10:38:20.040293 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, echo request, seq 1746, length 64
10:38:20.936475 IP6 fe80::1716:7110:4333:b8a8 > fe80::c225:e9ff:fe56:5950: ICMP6, neighbor solicitation, who has fe80::c225:e9ff:fe56:5950, length 32
^C
3159 packets captured
3159 packets received by filter
0 packets dropped by kernel
Ping6 on the default gateway not working:

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NB000854 ~ # ping6 -I enp9s0 fe80::c225:e9ff:fe56:5950
PING fe80::c225:e9ff:fe56:5950(fe80::c225:e9ff:fe56:5950) from fe80::1716:7110:4333:b8a8 enp9s0: 56 data bytes
^C
--- fe80::c225:e9ff:fe56:5950 ping statistics ---
4 packets transmitted, 0 received, 100% packet loss, time 3055ms

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