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--- proxmox:troubleshooting:no_internet_on_vm [2021/06/17 12:41] – peter
+++ proxmox:troubleshooting:no_internet_on_vm [2021/06/19 09:26] (current) – peter
@@ Line 72: / Line 72: @@
 E: SYSTEMD_ALIAS=/sys/subsystem/net/devices/eth0
 E: TAGS=:systemd:
+</code>
+----
+===== Check the Network Link file shown by udev =====
+<code bash>
+cat /usr/lib/systemd/network/99-default.link
+</code>
+returns:
+<code bash>
+#  SPDX-License-Identifier: LGPL-2.1+
+#
+#  This file is part of systemd.
+#
+#  systemd is free software; you can redistribute it and/or modify it
+#  under the terms of the GNU Lesser General Public License as published by
+#  the Free Software Foundation; either version 2.1 of the License, or
+#  (at your option) any later version.
+[Link]
+NamePolicy=keep kernel database onboard slot path
+MACAddressPolicy=persistent
+</code>
+----
+===== Check the Journal =====
+<code bash>
+journalctl -b -u systemd-networkd.service -u systemd-udevd.service --no-hostname
+</code>
+returns:
+<code bash>
+Mar 10 07:11:36 systemd[1]: Starting udev Kernel Device Manager...
+Mar 10 07:11:36 systemd[1]: Started udev Kernel Device Manager.
+Mar 10 07:11:36 systemd[1]: Starting Network Service...
+Mar 10 07:11:36 systemd-udevd[296]: link_config: autonegotiation is unset or enabled, the speed and duplex are n
+Mar 10 07:11:37 systemd-networkd[269]: Enumeration completed
+Mar 10 07:11:37 systemd-networkd[269]: lo: Removing non-existent address: ::1/128 (valid forever), ignoring
+Mar 10 07:11:37 systemd[1]: Started Network Service.
+Mar 10 07:11:37 systemd-udevd[279]: Using default interface naming scheme 'v240'.
+Mar 10 07:11:37 systemd-networkd[269]: eth0: Gained carrier
+Mar 10 07:11:37 systemd-networkd[269]: eth0: Could not bring up interface: Invalid argument
+Mar 10 07:11:37 systemd-networkd[269]: eth0: could not set address: Permission denied
+</code>
+<WRAP info>
+**NOTE:**  The following messages seems interesting:
+  * **link_config: autonegotiation is unset or enabled, the speed and duplex are n**.
+  * **Using default interface naming scheme 'v240'**.
+  * **eth0: Could not bring up interface: Invalid argument**.
+</WRAP>
+----
+===== link_config: autonegotiation is unset or enabled =====
+<code bash>
+	Supported ports: [ ]
+	Supported link modes:   10baseT/Half 10baseT/Full
+baseT/Half 100baseT/Full
+baseT/Full
+baseT/Full
+	Supported pause frame use: Symmetric
+	Supports auto-negotiation: Yes
+	Supported FEC modes: Not reported
+	Advertised link modes:  10baseT/Half 10baseT/Full
+baseT/Half 100baseT/Full
+baseT/Full
+baseT/Full
+	Advertised pause frame use: Symmetric
+	Advertised auto-negotiation: Yes
+	Advertised FEC modes: Not reported
+	Speed: 1000Mb/s
+	Duplex: Full
+	Port: Twisted Pair
+	PHYAD: 0
+	Transceiver: internal
+	Auto-negotiation: on
+	MDI-X: off (auto)
+	Current message level: 0x00000007 (7)
+			       drv probe link
+	Link detected: yes
 </code>