Install Squid Proxy allowing IPv4 address and OpenVPN 110 Port on VPS Debian 12

[HK-VPN]

1. Should be logged in as root or run this command in your console:

sudo su

2. Update and upgrade the VPS, run this command in your console:

apt-get clean && apt-get update && apt-get upgrade -y && apt-get full-upgrade -y && apt-get --fix-missing install -y && apt-get autoremove -y && reboot

3. Install Squid Proxy, run this command in your console:

apt install squid -y

4. Replace /etc/squid/squid.conf, with this:

acl localnet src 0.0.0.1-0.255.255.255    # RFC 1122 "this" network (LAN)
acl localnet src 10.0.0.0/8        # RFC 1918 local private network (LAN)
acl localnet src 100.64.0.0/10        # RFC 6598 shared address space (CGN)
acl localnet src 169.254.0.0/16     # RFC 3927 link-local (directly plugged) machines
acl localnet src 172.16.0.0/12        # RFC 1918 local private network (LAN)
acl localnet src 192.168.0.0/16        # RFC 1918 local private network (LAN)
acl localnet src fc00::/7           # RFC 4193 local private network range
acl localnet src fe80::/10          # RFC 4291 link-local (directly plugged) machines

acl Safe_ports port 110
http_access deny !safe_ports

http_access allow localhost manager
http_access deny manager

http_access allow localhost

acl my_ipv4 dst x.x.x.x/24     # Replace x.x.x.x with your VPS IPv4 address
http_access allow my_ipv4

http_access deny all

http_port 8000

coredump_dir /var/spool/squid

refresh_pattern ^ftp:        1440    20%    10080
refresh_pattern ^gopher:    1440    0%    1440
refresh_pattern -i (/cgi-bin/|\?) 0    0%    0
refresh_pattern .        0    20%    4320

* Make sure you allow listening port on your firewall

6. FINALLY, reboot your VPS, run this command in your console:

reboot

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