Linux-Servers.md: Wireguard problem hinzugefügt; Neu: Steuererklärungen.md

2026-03-21 22:10:19 +01:00
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+# Wireguard problem
+
+Please help troubleshooting and repairing a Wireguard connection.
+
+## Setup
+
+WireGuard IP-Addresses:
+10.8.0.1 DesTEngSsv005
+10.8.0.6 DesTEngSsv006
+10.8.0.3 DesTEngSnb003
+
+### DesTEngSsv005
+
+DesTEngSsv005 is a datacenter Linux server
+with public IP-address 65.108.193.31 .
+In the Wireguard setup the server is the bridge between an office server
+and a notebook.
+I am the system administrator and have root access.
+
+### DesTEngSsv006
+
+DesTEngSsv006 is an office Linux server with a dynamic IP-address for 
+Internet access.
+
+### DesTEngSnb003
+
+DesTEngSnb003 is my personal Windows notebook with a dynamic IP-address for 
+Internet access.
+
+## Symptoms
+
+Today I noticed that from DesTEngSnb003 the Wireguard connection to
+DesTEngSsv006 is not working anymore: The connection could not be established.
+
+I can ping DesTEngSsv005 from DesTEngSnb003.
+
+
+
+
+The latest handshake with 10.8.0.6 happened 21 hours ago:
+
+```
+root@sv005 ~ # wg show
+interface: wg0
+  public key: Fww9ON7EvuRom7M9BN97bRpxduIM4V54z/Ij6eunrgo=
+  private key: (hidden)
+  listening port: 51820
+
+peer: YUOO8IHL218cmeaS1c/VH9STQRGryrlWk0oXvtCbqFY=
+  endpoint: 87.152.118.183:49669
+  allowed ips: 10.8.0.3/32
+  latest handshake: 4 seconds ago
+  transfer: 21.22 MiB received, 633.64 MiB sent
+
+peer: XTC0cB4R3hurXh9NTIhPfDlam3ahrau21F/ezJUJSRs=
+  endpoint: 89.244.105.89:49166
+  allowed ips: 10.8.0.6/32
+  latest handshake: 21 hours, 32 minutes, 20 seconds ago
+  transfer: 1.13 GiB received, 115.96 MiB sent
+```
+
+The Wireguard connection was working well before, I am the only admin of
+all three machines and I have not intentionally changed any firewall
+settings or FORWARD chains.
+
+```traceroute 10.8.0.6``` does not work on my notebook in a CMD window;
+likely because the notebook has Windows and not Linux.
+
+On the weekend I'm not in the office; therefore, I cannot check anything
+on DesTEngSsv006 now. Are there any helpful and promising checks I could
+do right now with my access limited to DesTEngSsv005 and DesTEngSnb003?
+
+
+
+
+
+The notebook can reach the hub:
+```
+C:\Users\tlg>tracert -d 10.8.0.6
+
+Routenverfolgung zu 10.8.0.6 über maximal 30 Hops
+
+  1    50 ms    49 ms    49 ms  10.8.0.1
+  2     *        *        *     Zeitüberschreitung der Anforderung.
+  3     *        *        *     Zeitüberschreitung der Anforderung.
+  4     *        *        *     Zeitüberschreitung der Anforderung.
+  5     *     ^C
+```
+
+I started this:
+```
+root@sv005 ~ # ping 89.244.105.89
+PING 89.244.105.89 (89.244.105.89) 56(84) bytes of data.
+```
+For more than one minute no answer arrived.
+So likely the office Internet connection is down.
+
+Thank you, I will proceed troubleshooting on Monday in the office.