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docs/uninstall.md

+# Uninstall the VPN
+
+*Read this in other languages: [English](uninstall.md), [简体中文](uninstall-zh.md).*
+
+Follow these steps to remove the VPN. Commands must be run as `root`, or with `sudo`.
+
+## Steps
+
+* [First step](#first-step)
+* [Second step](#second-step)
+* [Third step](#third-step)
+* [Fourth step](#fourth-step)
+* [Optional](#optional)
+* [When finished](#when-finished)
+
+## First step
+
+```bash
+service ipsec stop
+service xl2tpd stop
+rm -rf /usr/local/sbin/ipsec /usr/local/libexec/ipsec
+rm -f /etc/init/ipsec.conf /lib/systemd/system/ipsec.service \
+      /etc/init.d/ipsec /usr/lib/systemd/system/ipsec.service
+```
+
+## Second step
+
+### Ubuntu/Debian
+
+`apt-get purge xl2tpd`
+
+### CentOS/RHEL
+
+`yum remove xl2tpd`
+
+## Third step
+
+### Ubuntu/Debian
+
+Edit `/etc/iptables.rules` and remove unneeded rules. Your original rules (if any) are backed up as `/etc/iptables.rules.old-date-time`. In addition, edit `/etc/iptables/rules.v4` if the file exists.   
+
+### CentOS/RHEL
+
+Edit `/etc/sysconfig/iptables` and remove unneeded rules. Your original rules (if any) are backed up as `/etc/sysconfig/iptables.old-date-time`.
+
+**Note:** If using CentOS/RHEL 8 and firewalld was active during VPN setup, nftables may be configured. Edit `/etc/sysconfig/nftables.conf` and remove unneeded rules. Your original rules are backed up as `/etc/sysconfig/nftables.conf.old-date-time`.
+
+## Fourth step
+
+Edit `/etc/sysctl.conf` and remove the lines after `# Added by hwdsl2 VPN script`.   
+Edit `/etc/rc.local` and remove the lines after `# Added by hwdsl2 VPN script`. DO NOT remove `exit 0` (if any).
+
+## Optional
+
+**Note:** This step is optional.
+
+Remove these config files:
+
+* /etc/ipsec.conf*
+* /etc/ipsec.secrets*
+* /etc/ppp/chap-secrets*
+* /etc/ppp/options.xl2tpd*
+* /etc/pam.d/pluto
+* /etc/sysconfig/pluto
+* /etc/default/pluto
+* /etc/ipsec.d (directory)
+* /etc/xl2tpd (directory)
+
+Copy and paste for fast removal:
+
+```bash
+rm -f /etc/ipsec.conf* /etc/ipsec.secrets* /etc/ppp/chap-secrets* /etc/ppp/options.xl2tpd* \
+      /etc/pam.d/pluto /etc/sysconfig/pluto /etc/default/pluto
+rm -rf /etc/ipsec.d /etc/xl2tpd
+```
+
+## When finished
+
+Reboot your server.