ping6 (ping IPv6) does not work inside CentOS 7 virtual machine

[dompan]

Hello,

I setup CentOS 7 in an virtual machine of VMware workstation with NAT.

In IPv4, everything works (including ping to other addresses, Internet access etc…). In VMware Virtual Network Editor, for NAT, in IPv4,

the IP range and default gateway are automatically provided. But for IPv6, only the prefix is provided fd15:4ba5:5a2b:1008::/64, there is no indication of gateway.

So I assign to the server the static IP fd15:4ba5:5a2b:1008::6/64, but I do not know how to fill the IPv6 default gateway (IPV6_DEFAULTGW directive).

And I cannot ping6 to external IPv6 address like ipv6.google.com.

[code]

#cat /etc/sysconfig/network-scripts/Ifcfg-eth0

TYPE="Ethernet"

PROXY_METHOD="none"

BROWSER_ONLY="no"

BOOTPROTO="none"

DEFROUTE="yes"

IPV4_FAILURE_FATAL="no"

IPV6INIT="yes"

IPV6_AUTOCONF="no"

IPV6ADDR="fd15:4ba5:5a2b:1008::6/64"

#IPV6_DEFAULTGW="fd15:4ba5:5a2b:1008::2"  # don't know how to fill the value

IPV6_DEFROUTE="yes"

IPV6_FAILURE_FATAL="no"

IPV6_ADDR_GEN_MODE="stable-privacy"

NAME="ens33"

UUID="583c9e4b-5df6-48c6-acf2-4f04a2470d53"

DEVICE="eth0"

ONBOOT="yes"

IPADDR="192.168.145.6"

PREFIX="24"

GATEWAY="192.168.145.2"

DNS1="8.8.8.8"

DNS2="1.1.1.1"

IPV6_PRIVACY="no"

[/code]

[code]

# ip addr

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000

    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

    inet 127.0.0.1/8 scope host lo

       valid_lft forever preferred_lft forever

    inet6 ::1/128 scope host

       valid_lft forever preferred_lft forever

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000

    link/ether 00:0c:29:4c:b3:e6 brd ff:ff:ff:ff:ff:ff

    inet 192.168.145.6/24 brd 192.168.145.255 scope global noprefixroute eth0

       valid_lft forever preferred_lft forever

    inet6 fd15:4ba5:5a2b:1008::6/64 scope global noprefixroute

       valid_lft forever preferred_lft forever

    inet6 fe80::8318:1893:112e:ae94/64 scope link noprefixroute

       valid_lft forever preferred_lft forever

[/code]

[code]

# ip route show

default via 192.168.145.2 dev eth0 proto static metric 100

192.168.145.0/24 dev eth0 proto kernel scope link src 192.168.145.6 metric 100

[/code]

[code]

# cat /etc/resolv.conf

nameserver 8.8.8.8

nameserver 1.1.1.1

Without IPV6_DEFAULTGW directive:

[/code]

[code]

# ping6 ipv6.google.com

connect: Network is unreachable

With IPV6_DEFAULTGW directive:

# ping6 ipv6.google.com

PING fd15:4ba5:5a2b:1008::2(fd15:4ba5:5a2b:1008::2) 56 data bytes

From fd15:4ba5:5a2b:1008::6 icmp_seq=1 Destination unreachable: Address unreachable

[/code]

- I can ping6 another VMware machine which has ipv6="fd15:4ba5:5a2b:1008::7

- Of course I cannot ping6 the Ipv6 gateway with its wrong value fd15:4ba5:5a2b:1008::2.

My question is how to be able to do "ping6 ipv6.google.com". I assume I have to fill the IPV6_DEFAULTGW directive but with what value?

Is it possible from the prefix to deduce the gateway?

Many thanks in advance.

[yanw]

Actually VMware Workstation provides the stateless IPv6 configuration to VM and no need to config the gateway.  Would you please make sure you can ping  "ping6 ipv6.google.com" on your host?

[dompan]

Thank you for your response.

I cannot ping6, following are the results :

# ping6 ipv6.google.com

connect: Network is unreachable

# ping ipv6.google.com

ping: ipv6.google.com: Name or service not known

# ping -6 ipv6.google.com

connect: Network is unreachable

[yanw]

VM's IPv6 connection depends on your host network. If your host can not connect to the external IPv6 address, VM also can not

[dompan]

Oh thank you, you pointed out the right problem.

With my current Windows host, the ping -6 (Windows) or ping6 (CentOS 7 in virtual manchine) both work correctly.

I have another Windows host, the ping -6 (Windows) or ping6 (CentOS 7 in virtual manchine) both do no work.

So now I have to investigate why the ping.exe -6 does not work on my current Windows installation.

[dompan]

Hello,

Unfortunately I have to reopen the question because the problem is still alive.

I found thanks to suggestion to check my Windows host. IPv6 functions are all OK except for the ping -6.

In fact this is due to Malwarebytes Web Protection function. By deactivating it, ping -6 now works on my Windows host,

but the problem is still alive inside my CentOS 7 virtual machine.

# ping6 ipv6.google.com

connect: Network is unreachable

Same problem for any other IPv6 address, by name or by IP value.

So is it a route problem? There is no default gateway needed in IPv6 for VMware as said, so what is the problem?

How to solve it?

Thank you.

[yanw]

Can CentOS VM ping with your host ipv6 address in NAT mode? If the CentOS7 VM works in Bridge mode, is that possible to ping the ipv6.google.com?

[dompan]

In NAT mode (current and default mode of my virtual machine): I can ping6 my Windows host IPv6 addresses

fd15:4ba5:5a2b:1008:c8fe:1cca:bb95:2f9a

fd15:4ba5:5a2b:1008:64b2:acac:ae72:2798

(I found these 2 addresses by using ipconfig /all, and look at the values given at Ethernet VMware Network Adapter VMnet8). Is it OK?

Note: th IPv6 prefix given by VMware Virtual Network editor is: fd15:4ba5:5a2b:1008::/64

In Bridged mode (a mode I don't use and I do not understand much): I just edit the machine configuration, change to Bridged mode, than reboot the machine,

without changing (because no knowledge) anything in the network configuration. Result: nothing works, nor IPv4 nor IPv6. So I switch back to NAT mode

which is the default mode suggested by VMware at machine creation, and I am more used to this mode.

Thank you.

[yanw]

I think the physical network adapter on your windows host also has a valide IPv6 address, right? I mean ipv6 ping to that physical network adapter (not vmnet8). Would you please paste the output of "ipconfig /all" on your windows host?

[dompan]

I ping the 2 public IPv6 of my Windows host from my virtual machine without success:

# ping6 2a01:cb1d:303:e800:a4f5:e771:16dd:XXXX

connect: Network is unreachable

# ping6 2a01:cb1d:303:e800:3d68:11aa:dd68:YYYY

connect: Network is unreachable

Following is the output of my ipconfig /all:

15/09/2020 10:25:38,46

>ipconfig.exe  /all       

Configuration IP de Windows

   Nom de l'hôte . . . . . . . . . . : XXXX

   Suffixe DNS principal . . . . . . :

   Type de noeud. . . . . . . . . .  : Hybride

   Routage IP activé . . . . . . . . : Non

   Proxy WINS activé . . . . . . . . : Non

   Liste de recherche du suffixe DNS.: home

Carte Ethernet Ethernet :

   Suffixe DNS propre à la connexion. . . : home

   Description. . . . . . . . . . . . . . : Realtek PCIe GbE Family Controller

   Adresse physique . . . . . . . . . . . : B4-A9-FC-5F-D3-A4

   DHCP activé. . . . . . . . . . . . . . : Oui

   Configuration automatique activée. . . : Oui

   Adresse IPv6. . . . . . . . . . . . . .: 2a01:cb1d:303:e800:a4f5:e771:16dd:XXXX(préféré)

   Adresse IPv6 temporaire . . . . . . . .: 2a01:cb1d:303:e800:3d68:11aa:dd68:YYYY(préféré)

   Adresse IPv6 de liaison locale. . . . .: fe80::a4f5:e771:16dd:1c24%6(préféré)

   Adresse IPv4. . . . . . . . . . . . . .: 192.168.1.14(préféré)

   Masque de sous-réseau. . . . . . . . . : 255.255.255.0

   Bail obtenu. . . . . . . . . . . . . . : lundi 14 septembre 2020 18:08:52

   Bail expirant. . . . . . . . . . . . . : mercredi 16 septembre 2020 06:13:33

   Passerelle par défaut. . . . . . . . . : fe80::42f2:1ff:fe67:c9c%6

                                 192.168.1.1

   Serveur DHCP . . . . . . . . . . . . . : 192.168.1.1

   IAID DHCPv6 . . . . . . . . . . . : 95726076

   DUID de client DHCPv6. . . . . . . . : 00-01-00-01-25-9C-C7-26-B4-A9-FC-5F-D3-A4

   Serveurs DNS. . .  . . . . . . . . . . : fe80::42f2:1ff:fe67:c9c%6

                                 8.8.8.8

                                 8.8.4.4

   NetBIOS sur Tcpip. . . . . . . . . . . : Activé

   Liste de recherche de suffixes DNS propres à la connexion :

                                 home

Carte Ethernet Ethernet 3 :

   Suffixe DNS propre à la connexion. . . :

   Description. . . . . . . . . . . . . . : VirtualBox Host-Only Ethernet Adapter

   Adresse physique . . . . . . . . . . . : 0A-00-27-00-00-12

   DHCP activé. . . . . . . . . . . . . . : Non

   Configuration automatique activée. . . : Oui

   Adresse IPv6 de liaison locale. . . . .: fe80::c987:e623:20cd:a2d2%18(préféré)

   Adresse IPv4. . . . . . . . . . . . . .: 192.168.56.1(préféré)

   Masque de sous-réseau. . . . . . . . . : 255.255.255.0

   Passerelle par défaut. . . . . . . . . :

   IAID DHCPv6 . . . . . . . . . . . : 470417447

   DUID de client DHCPv6. . . . . . . . : 00-01-00-01-25-9C-C7-26-B4-A9-FC-5F-D3-A4

   Serveurs DNS. . .  . . . . . . . . . . : fec0:0:0:ffff::1%1

                                 fec0:0:0:ffff::2%1

                                 fec0:0:0:ffff::3%1

   NetBIOS sur Tcpip. . . . . . . . . . . : Activé

Carte réseau sans fil Connexion au réseau local* 1 :

   Statut du média. . . . . . . . . . . . : Média déconnecté

   Suffixe DNS propre à la connexion. . . :

   Description. . . . . . . . . . . . . . : Microsoft Wi-Fi Direct Virtual Adapter

   Adresse physique . . . . . . . . . . . : C8-09-A8-1C-F5-76

   DHCP activé. . . . . . . . . . . . . . : Oui

   Configuration automatique activée. . . : Oui

Carte réseau sans fil Connexion au réseau local* 2 :

   Statut du média. . . . . . . . . . . . : Média déconnecté

   Suffixe DNS propre à la connexion. . . :

   Description. . . . . . . . . . . . . . : Microsoft Wi-Fi Direct Virtual Adapter #2

   Adresse physique . . . . . . . . . . . : CA-09-A8-1C-F5-75

   DHCP activé. . . . . . . . . . . . . . : Non

   Configuration automatique activée. . . : Oui

Carte Ethernet Ethernet 2 :

   Statut du média. . . . . . . . . . . . : Média déconnecté

   Suffixe DNS propre à la connexion. . . :

   Description. . . . . . . . . . . . . . : AnchorFree TAP-Windows Adapter V9

   Adresse physique . . . . . . . . . . . : 00-FF-71-4E-A6-F9

   DHCP activé. . . . . . . . . . . . . . : Oui

   Configuration automatique activée. . . : Oui

Carte Ethernet VMware Network Adapter VMnet1 :

   Suffixe DNS propre à la connexion. . . :

   Description. . . . . . . . . . . . . . : VMware Virtual Ethernet Adapter for VMnet1

   Adresse physique . . . . . . . . . . . : 00-50-56-C0-00-01

   DHCP activé. . . . . . . . . . . . . . : Non

   Configuration automatique activée. . . : Oui

   Adresse IPv6 de liaison locale. . . . .: fe80::a819:f389:a081:7155%22(préféré)

   Adresse IPv4. . . . . . . . . . . . . .: 192.168.11.1(préféré)

   Masque de sous-réseau. . . . . . . . . : 255.255.255.0

   Passerelle par défaut. . . . . . . . . :

   IAID DHCPv6 . . . . . . . . . . . : 117461078

   DUID de client DHCPv6. . . . . . . . : 00-01-00-01-25-9C-C7-26-B4-A9-FC-5F-D3-A4

   Serveurs DNS. . .  . . . . . . . . . . : fec0:0:0:ffff::1%1

                                 fec0:0:0:ffff::2%1

                                 fec0:0:0:ffff::3%1

   NetBIOS sur Tcpip. . . . . . . . . . . : Activé

Carte Ethernet VMware Network Adapter VMnet8 :

   Suffixe DNS propre à la connexion. . . :

   Description. . . . . . . . . . . . . . : VMware Virtual Ethernet Adapter for VMnet8

   Adresse physique . . . . . . . . . . . : 00-50-56-C0-00-08

   DHCP activé. . . . . . . . . . . . . . : Non

   Configuration automatique activée. . . : Oui

   Adresse IPv6. . . . . . . . . . . . . .: fd15:4ba5:5a2b:1008:c8fe:1cca:bb95:2f9a(préféré)

   Adresse IPv6 temporaire . . . . . . . .: fd15:4ba5:5a2b:1008:64b2:acac:ae72:2798(préféré)

   Adresse IPv6 temporaire . . . . . . . .: fd15:4ba5:5a2b:1008:a92f:19e:f8c3:856e(déprécié)

   Adresse IPv6 temporaire . . . . . . . .: fd15:4ba5:5a2b:1008:e1e4:34ec:634d:eebc(déprécié)

   Adresse IPv6 de liaison locale. . . . .: fe80::c8fe:1cca:bb95:2f9a%20(préféré)

   Adresse IPv4. . . . . . . . . . . . . .: 192.168.145.1(préféré)

   Masque de sous-réseau. . . . . . . . . : 255.255.255.0

   Passerelle par défaut. . . . . . . . . : fe80::250:56ff:fec0:2222%20

   IAID DHCPv6 . . . . . . . . . . . : 318787670

   DUID de client DHCPv6. . . . . . . . : 00-01-00-01-25-9C-C7-26-B4-A9-FC-5F-D3-A4

   Serveurs DNS. . .  . . . . . . . . . . : fec0:0:0:ffff::1%1

                                 fec0:0:0:ffff::2%1

                                 fec0:0:0:ffff::3%1

   NetBIOS sur Tcpip. . . . . . . . . . . : Activé

Carte réseau sans fil Wi-Fi :

   Statut du média. . . . . . . . . . . . : Média déconnecté

   Suffixe DNS propre à la connexion. . . : home

   Description. . . . . . . . . . . . . . : Intel(R) Wi-Fi 6 AX201 160MHz

   Adresse physique . . . . . . . . . . . : C8-09-A8-1C-F5-75

   DHCP activé. . . . . . . . . . . . . . : Oui

   Configuration automatique activée. . . : Oui

Carte Ethernet Connexion réseau Bluetooth :

   Statut du média. . . . . . . . . . . . : Média déconnecté

   Suffixe DNS propre à la connexion. . . :

   Description. . . . . . . . . . . . . . : Bluetooth Device (Personal Area Network)

   Adresse physique . . . . . . . . . . . : C8-09-A8-1C-F5-79

   DHCP activé. . . . . . . . . . . . . . : Oui

   Configuration automatique activée. . . : Oui

15/09/2020 10:25:38,51

---

Thank you.

[yanw]

Seems you have also installed virtuabox on your windows host? Would you please remove the virtualbox and have a another try? And also make sure there is not any third-party software that would cause the network issue. Ideally the ipv6 ping from VM to Host physical adapter should work

[dompan]

I uninstalled Oracle Virtual Box and tried again without success :-(.

I searched a lot and there are few articles with similar environment. Either I need an IPv6 gateway (not provided by VMware), or an IPv6 address that is routeable (how to set it up?).

Currently I only have local IPv6 addresses (fd15:4ba5:5a2b:1008::6/64 and fe80::8318:1893:112e:ae94/64).

# ip addr

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000

    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

    inet 127.0.0.1/8 scope host lo

       valid_lft forever preferred_lft forever

    inet6 ::1/128 scope host

       valid_lft forever preferred_lft forever

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000

    link/ether 00:0c:29:4c:b3:e6 brd ff:ff:ff:ff:ff:ff

    inet 192.168.145.6/24 brd 192.168.145.255 scope global noprefixroute eth0

       valid_lft forever preferred_lft forever

    inet6 fd15:4ba5:5a2b:1008::6/64 scope global noprefixroute

       valid_lft forever preferred_lft forever

    inet6 fe80::8318:1893:112e:ae94/64 scope link noprefixroute

       valid_lft forever preferred_lft forever

From IPv6 routing table, it seems that I can not go out anywhere:

# ip -6 route

unreachable ::/96 dev lo metric 1024 error -113 pref medium

unreachable ::ffff:0.0.0.0/96 dev lo metric 1024 error -113 pref medium

unreachable 2002:a00::/24 dev lo metric 1024 error -113 pref medium

unreachable 2002:7f00::/24 dev lo metric 1024 error -113 pref medium

unreachable 2002:a9fe::/32 dev lo metric 1024 error -113 pref medium

unreachable 2002:ac10::/28 dev lo metric 1024 error -113 pref medium

unreachable 2002:c0a8::/32 dev lo metric 1024 error -113 pref medium

unreachable 2002:e000::/19 dev lo metric 1024 error -113 pref medium

unreachable 3ffe:ffff::/32 dev lo metric 1024 error -113 pref medium

fd15:4ba5:5a2b:1008::/64 dev eth0 proto kernel metric 100 pref medium

fe80::/64 dev eth0 proto kernel metric 100 pref medium

This article talks about necessity of an IPv6 gateway:

https://askubuntu.com/questions/645008/ipv6-connect-network-is-unreachable

This article indicates that I need public routable IPv6 address:

https://unix.stackexchange.com/questions/293800/i-dont-get-ipv6-why-cannot-i-ping-ipv6-google-com/29...

"But even currently you only have a link-local address so that will not work. You need a IPv6 address that is routable to be able to ping outwards."

So am I still stuck !

Thank you for your help.

[dompan]

Latest update:

I had same problem witn an Ubuntu server as virtual machine.

By changing from NAT to Bridged, it works (ping IPv4 and IPv6).

So I will change my CentOS 7 from NAT to Bridged too, it would solve my ping6 problem.

[sly_gryphon]

I have had a lot of trouble getting IPv6 NAT to work in the past as well, but the latest version. Workstation Pro 17, now seems to be working correctly.

I am running on a Ubuntu host, and I can ping from both Ubuntu and Windows guests, although DNS may not resolve immediately, and there is a preference for IPv4 for dual-stack destinations.

## Default gateway ##

Note that NAT mode uses NAT66, so it provides a ULA range (default is fd15:4ba5:5a2b:1008::/64) that will use stateless autoconfigure, providing the prefix and default route/gateway (via Router Advertisement).

Note that a machine will usually have multiple IPv6 addresses: a link-local address, auto-configured address, temporary addresses, and static addresses. (Unlike IPv4 where you generally only have one).

You want to leave IPV6_AUTOCONF="yes", so that it will autoconfigure the gateway (IPv6 is normally auto-configuring, one of the benefits over IPv4). You can both autoconfigure *and* assign a fixed address (it will get both).

As seen in `ip -6 route`, there is no auto-configure gateway. This will be the link-local address of the upstream router, e.g. on my Ubuntu guest:

```

sly@ubuntu:~$ ip -6 route

...

default via fe80::250:56ff:fec0:2222 dev ens33 proto ra metric 100 pref medium

```

It is not normal to manually configure the IPv6 gateway, but if you really want to, then you need to work out the link local address of the virtual network. Enable IPV6_AUTOCONF="yes" to find it, or maybe `ip neigh` will show it -- but leaving auto-configure on is better.

As mentioned, in previous versions of Workstation Pro this did not work correctly, but the latest version (Workstation 17) is.

## IPv6 addresses ##

Normally you would use a global IPv6 address, but in NAT mode the host is using Network Address Translation and providing Unique Local Addressses (ULA) to guests (ULAs are the rough equivalent of IPv4 private ranges).

Just like with NAT44, the internet will see your host's IPv6 address, which is translated to the internal ranges.

While NAT66 does not have a lot of uses, a default configuration for a virtual machine host is one of them, as there is no guarantee that your host will get more than one IPv6 address.

Using global addresses for your IPv6 guests is possible via Bridge mode, where the host simply configures (and advertises) as many IPv6 addresses as needed; in this case the default gateway is the same as the host.

With IPv6 (but not IPv4) there would be a third option, where the virtual machine host could request a prefix delegation (route an entire prefix to it), that it uses a whole subnet for the virtual machines (all auto-configured), although this has not yet been implemented in VMWare Workstation.

## Examples ##

Here are some recent tests from a Ubuntu guest, running on Workstation Pro 17, on a Ubuntu host, using NAT network (vmnet8). Just auto-configure (no static address).

Note that I am using a different ULA prefix than the VMWare default, so blanked it out to xxxx in the output.

```

sly@ubuntu:~$ ping -6 ipv6-test.com

PING ipv6-test.com(2001:41d0:701:1100::29c8 (2001:41d0:701:1100::29c8)) 56 data bytes

64 bytes from 2001:41d0:701:1100::29c8 (2001:41d0:701:1100::29c8): icmp_seq=1 ttl=255 time=324 ms

64 bytes from 2001:41d0:701:1100::29c8 (2001:41d0:701:1100::29c8): icmp_seq=2 ttl=255 time=324 ms

64 bytes from 2001:41d0:701:1100::29c8 (2001:41d0:701:1100::29c8): icmp_seq=3 ttl=255 time=324 ms

64 bytes from 2001:41d0:701:1100::29c8 (2001:41d0:701:1100::29c8): icmp_seq=4 ttl=255 time=324 ms

64 bytes from 2001:41d0:701:1100::29c8 (2001:41d0:701:1100::29c8): icmp_seq=5 ttl=255 time=324 ms

^C

--- ipv6-test.com ping statistics ---

5 packets transmitted, 5 received, 0% packet loss, time 4003ms

rtt min/avg/max/mdev = 323.532/323.926/324.366/0.298 ms

sly@ubuntu:~$ ping ipv6-test.com

PING ipv6-test.com (51.75.78.103) 56(84) bytes of data.

64 bytes from muscaria.t0x.net (51.75.78.103): icmp_seq=1 ttl=128 time=422 ms

64 bytes from muscaria.t0x.net (51.75.78.103): icmp_seq=2 ttl=128 time=446 ms

^C

--- ipv6-test.com ping statistics ---

2 packets transmitted, 2 received, 0% packet loss, time 1001ms

rtt min/avg/max/mdev = 422.136/434.012/445.889/11.876 ms

sly@ubuntu:~$ ping v6.ipv6-test.com

PING v6.ipv6-test.com(2001:41d0:701:1100::29c8 (2001:41d0:701:1100::29c8)) 56 data bytes

64 bytes from 2001:41d0:701:1100::29c8 (2001:41d0:701:1100::29c8): icmp_seq=1 ttl=255 time=324 ms

64 bytes from 2001:41d0:701:1100::29c8 (2001:41d0:701:1100::29c8): icmp_seq=2 ttl=255 time=323 ms

^C

--- v6.ipv6-test.com ping statistics ---

2 packets transmitted, 2 received, 0% packet loss, time 1001ms

rtt min/avg/max/mdev = 323.378/323.485/323.593/0.107 ms

sly@ubuntu:~$ ip -6 route

::1 dev lo proto kernel metric 256 pref medium

fdxx:xxxx:xxxx:1008::/64 dev ens33 proto ra metric 100 pref medium

fe80::/64 dev br-fb38f8cf6f06 proto kernel metric 256 pref medium

fe80::/64 dev veth426aa2d proto kernel metric 256 pref medium

fe80::/64 dev veth7e2bc1c proto kernel metric 256 pref medium

fe80::/64 dev ens33 proto kernel metric 1024 pref medium

default via fe80::250:56ff:fec0:2222 dev ens33 proto ra metric 100 pref medium

```