more ipv6 fixes

systemd/incubating/iperf3/README.md

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+# Iperf3
+
+## Install
+
+```bash
+ansible-playbook -i ansible/inventory.yaml systemd/incubating/iperf3/install_iperf3.yaml
+```

systemd/incubating/iperf3/install_iperf3.yaml

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+- name: Install iperf3 service
+  hosts: yellow
+  vars_files:
+    - vars.yaml
+  tasks:
+  - name: Ensure iperf3 is installed
+    ansible.builtin.dnf:
+      name:
+        - iperf3
+      state: present
+  - name: Copy iperf3.service
+    template:
+      src: iperf3.service
+      dest: /etc/systemd/system/iperf3.service
+      owner: root
+      group: root
+      mode: '0644'
+  - name: Reload iperf3 timer
+    ansible.builtin.systemd_service:
+      state: restarted
+      name: iperf3.service
+      enabled: true

systemd/incubating/iperf3/iperf3.service

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+[Unit]
+Description=iperf3 server
+After=syslog.target network.target auditd.service
+
+[Service]
+ExecStart=/usr/bin/iperf3 -s
+
+[Install]
+WantedBy=multi-user.target