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Problem: I cannot get a static IP on the ethernet port.

Aim: Trying to setup a static IP on the Realtek built-in ethernet (enp3s0) port so I can connect the server to my desktop via a crossover cable. At the moment, there is no cable connected between the 2.

Setup: Ubuntu Bionic server edition with Intel WiFi card and a Reaktek ethernet port. During installation, I had to connect the ethernet port to my modem/router as the Ubuntu installer cannot recognize my WiFi card.

Things I've tried:

1. I disabled my WiFi card and then I've tried using just "dchp4: true" and then connected a cable from the port to my modem/router. No issues getting an IP and pinging a site.




2. I've tried with and without "renderer: networkd", no difference.




3. I've tried with and without "dhcp4" false", no difference.




4. I've tried with and without gateway4, no difference.




5. I've tried with and without nameservers, no difference.




6. sudo netplan --debug apply doesn't show any errors




7. I looked at the generated config inside /run/systemd/network (included below) and looks ok.




8. Debugged systemd-networkd as suggested by this page (https://wiki.ubuntu.com/DebuggingSystemd) and I can see this line: "enp3s0: Link is not managed by us". That doesn't seemed right as I don't have anything else managing my interfaces and as I said in no.1, using DHCP worked.

Here's my current config:

>cat /etc/netplan/01-wireless.yaml

network:

  version: 2

  renderer: networkd

  wifis:

    wlp2s0:

      dhcp4: true

      access-points:

        "insert-access-point-here":

          password: "insert-password-here"



>cat /etc/netplan/02-ethernet.yaml

network:

  version: 2

  renderer: networkd

  ethernets:

    enp3s0:

      dhcp4: no

      dhcp6: yes

      addresses: [192.168.100.40/24]

      gateway4: 192.168.100.1

      nameservers:

        addresses: [8.8.8.8,8.8.4.4]





>cat /run/systemd/network/10-netplan-wlp2s0.network 

[Match]

Name=wlp2s0

[Network]

DHCP=ipv4

LinkLocalAddressing=ipv6

[DHCP]

UseMTU=true

RouteMetric=600



>cat /run/systemd/network/10-netplan-enp3s0.network 

[Match]

Name=enp3s0

[Network]

LinkLocalAddressing=ipv6

Address=192.168.2.1/24

Gateway=192.168.2.254

Results of netplan --debug apply

sudo netplan --debug apply                      

** (generate:13784): DEBUG: 03:16:37.754: Processing input file /etc/netplan/01-wireless.yaml..

** (generate:13784): DEBUG: 03:16:37.755: starting new processing pass

** (generate:13784): DEBUG: 03:16:37.755: wlp2s0: adding wifi AP 'myhotspot'

** (generate:13784): DEBUG: 03:16:37.755: Processing input file /etc/netplan/02-ethernet.yaml..

** (generate:13784): DEBUG: 03:16:37.755: starting new processing pass

** (generate:13784): DEBUG: 03:16:37.755: wlp2s0: setting default backend to 1

** (generate:13784): DEBUG: 03:16:37.755: enp3s0: setting default backend to 1

** (generate:13784): DEBUG: 03:16:37.755: Generating output files..

** (generate:13784): DEBUG: 03:16:37.755: wlp2s0: Creating wpa_supplicant configuration file run/netplan/wpa-wlp2s0.conf

** (generate:13784): DEBUG: 03:16:37.755: Creating wpa_supplicant service enablement link /run/systemd/system/multi-user.target.wants/netplan-wpa@wlp2s0.service

** (generate:13784): DEBUG: 03:16:37.755: NetworkManager: definition wlp2s0 is not for us (backend 1)

** (generate:13784): DEBUG: 03:16:37.755: NetworkManager: definition enp3s0 is not for us (backend 1)

DEBUG:netplan generated networkd configuration exists, restarting networkd

DEBUG:no netplan generated NM configuration exists

DEBUG:wlp2s0 not found in {}

DEBUG:enp3s0 not found in {}

DEBUG:Merged config:

network:

  bonds: {}

  bridges: {}

  ethernets:

    enp3s0:

      addresses:

      - 192.168.100.40/24

      dhcp4: false

      dhcp6: true

      gateway4: 192.168.100.1

      nameservers:

        addresses:

        - 8.8.8.8

        - 8.8.4.4

  vlans: {}

  wifis:

    wlp2s0:

      access-points:

        insert-access-point-here:

          password: insert-password-here

      dhcp4: true



DEBUG:Skipping non-physical interface: lo

DEBUG:device wlp2s0 operstate is up, not changing

DEBUG:{}

DEBUG:netplan triggering .link rules for lo

DEBUG:netplan triggering .link rules for enp3s0

DEBUG:netplan triggering .link rules for wlp2s0

Results of systemd networkd debugging:

>sudo SYSTEMD_LOG_LEVEL=debug /lib/systemd/systemd-networkd



Failed to read $container of PID 1, ignoring: Permission denied

Found container virtualization none.

Bus n/a: changing state UNSET → OPENING

Bus n/a: changing state OPENING → AUTHENTICATING

Failed to open configuration file '/etc/systemd/networkd.conf': No such file or directory

timestamp of '/etc/systemd/network' changed

timestamp of '/run/systemd/network' changed

Ignoring /run/systemd/network/10-netplan-enp3s0.network, because it's not a regular file with suffix .netdev.

Ignoring /run/systemd/network/10-netplan-wlp2s0.network, because it's not a regular file with suffix .netdev.

Ignoring /lib/systemd/network/99-default.link, because it's not a regular file with suffix .netdev.

Ignoring /lib/systemd/network/80-container-ve.network, because it's not a regular file with suffix .netdev.

Ignoring /lib/systemd/network/80-container-vz.network, because it's not a regular file with suffix .netdev.

Ignoring /lib/systemd/network/80-container-host0.network, because it's not a regular file with suffix .netdev.

Ignoring /lib/systemd/network/99-default.link, because it's not a regular file with suffix .network.

wlp2s0: Flags change: +UP +LOWER_UP +RUNNING +MULTICAST +BROADCAST

wlp2s0: Link 3 added

wlp2s0: udev initialized link

wlp2s0: Saved original MTU: 1500

enp3s0: Flags change: +UP +MULTICAST +BROADCAST

enp3s0: Link 2 added

enp3s0: udev initialized link

enp3s0: Saved original MTU: 1500

lo: Flags change: +LOOPBACK +UP +LOWER_UP +RUNNING

lo: Link 1 added

lo: udev initialized link

lo: Saved original MTU: 0

wlp2s0: Adding address: fe80::3613:e8ff:fe41:a078/64 (valid forever)

wlp2s0: Gained IPv6LL

lo: Adding address: ::1/128 (valid forever)

wlp2s0: Adding address: 192.168.1.2/24 (valid forever)

lo: Adding address: 127.0.0.1/8 (valid forever)

rtnl: received address with invalid family 129, ignoring

Enumeration completed

Bus n/a: changing state AUTHENTICATING → HELLO

Sent message type=method_call sender=n/a destination=org.freedesktop.DBus path=/org/freedesktop/DBus interface=org.freedesktop.DBus member=Hello cookie=1 reply_cookie=0 signature=n/a error-name=n/a error-message=n/a

Sent message type=method_call sender=n/a destination=org.freedesktop.DBus path=/org/freedesktop/DBus interface=org.freedesktop.DBus member=RequestName cookie=2 reply_cookie=0 signature=su error-name=n/a error-message=n/a

Sent message type=method_call sender=n/a destination=org.freedesktop.DBus path=/org/freedesktop/DBus interface=org.freedesktop.DBus member=AddMatch cookie=3 reply_cookie=0 signature=s error-name=n/a error-message=n/a

Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1/link/_33 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=4 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a

Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1/link/_32 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=5 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a

Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1/link/_31 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=6 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a

Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1/link/_33 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=7 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a

Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1/link/_33 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=8 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a

Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=9 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a

wlp2s0: Link state is up-to-date

wlp2s0: found matching network '/run/systemd/network/10-netplan-wlp2s0.network'

enp3s0: Link is not managed by us

lo: Link is not managed by us

LLDP: Started LLDP client

wlp2s0: Started LLDP.

wlp2s0: Acquiring DHCPv4 lease

DHCP CLIENT (0x8f3ad0c0): STARTED on ifindex 3

wlp2s0: Discovering IPv6 routers

NDISC: Started IPv6 Router Solicitation client

Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1/link/_33 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=10 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a

Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1/link/_33 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=11 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a

Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1/link/_33 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=12 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a

NDISC: Sent Router Solicitation, next solicitation in 3s

Got message type=method_return sender=org.freedesktop.DBus destination=:1.12 path=n/a interface=n/a member=n/a cookie=1 reply_cookie=1 signature=s error-name=n/a error-message=n/a

Bus n/a: changing state HELLO → RUNNING

DHCP CLIENT (0x8f3ad0c0): DISCOVER

Got message type=signal sender=org.freedesktop.DBus.Local destination=n/a path=/org/freedesktop/DBus/Local interface=org.freedesktop.DBus.Local member=Connected cookie=4294967295 reply_cookie=0 signature=n/a error-name=n/a error-message=n/a

Got message type=signal sender=org.freedesktop.DBus destination=:1.12 path=/org/freedesktop/DBus interface=org.freedesktop.DBus member=NameAcquired cookie=2 reply_cookie=0 signature=s error-name=n/a error-message=n/a

Got message type=signal sender=org.freedesktop.DBus destination=:1.12 path=/org/freedesktop/DBus interface=org.freedesktop.DBus member=NameAcquired cookie=3 reply_cookie=0 signature=s error-name=n/a error-message=n/a

Got message type=method_return sender=org.freedesktop.DBus destination=:1.12 path=n/a interface=n/a member=n/a cookie=4 reply_cookie=2 signature=u error-name=n/a error-message=n/a

Successfully acquired requested service name.

Got message type=method_return sender=org.freedesktop.DBus destination=:1.12 path=n/a interface=n/a member=n/a cookie=5 reply_cookie=3 signature=n/a error-name=n/a error-message=n/a

Match type='signal',sender='org.freedesktop.login1',path='/org/freedesktop/login1',interface='org.freedesktop.login1.Manager',member='PrepareForSleep' successfully installed.

enp3s0: Link state is up-to-date

enp3s0: found matching network '/run/systemd/network/10-netplan-enp3s0.network'

lo: Link is not managed by us

wlp2s0: Link does not request DHCPv6 prefix delegation

LLDP: Started LLDP client

enp3s0: Started LLDP.

Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1/link/_32 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=13 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a

lo: Link state is up-to-date

No virtualization found in DMI

No virtualization found in CPUID

Virtualization XEN not found, /proc/xen does not exist

This platform does not support /proc/device-tree

No virtualization found in /proc/cpuinfo.

This platform does not support /proc/sysinfo

Found VM virtualization none

lo: Unmanaged

Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1/link/_31 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=14 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a

wlp2s0: Removing address: 192.168.1.2/24 (valid forever)

Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1/link/_33 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=15 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a

Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=16 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a

DHCP CLIENT (0x8f3ad0c0): OFFER

DHCP CLIENT (0x8f3ad0c0): REQUEST (requesting)

DHCP CLIENT (0x8f3ad0c0): ACK

wlp2s0: DHCPv4 address 192.168.1.2/24 via 192.168.1.1

wlp2s0: Updating address: 192.168.1.2/24 (valid forever)

Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1/link/_33 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=17 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a

Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=18 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a

wlp2s0: DHCP error: could not get routes: No data available

wlp2s0: Configured

Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1/link/_33 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=19 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a

NDISC: Sent Router Solicitation, next solicitation in 7s

NDISC: Sent Router Solicitation, next solicitation in 14s

NDISC: No RA received before link confirmation timeout

NDISC: Invoking callback for 't'.