IpTables based port forwarding make sure to disable ufw or set rule to make it work

iptable-port-forwarding-vpn.md

udp port forwarding for any service like postgresql,rtp etc

PUB_IF="eth0"
WG_IF="wg0"

# Forward incoming UDP:8964 on public IP → laptop (10.7.0.2:8964)
sudo iptables -t nat -A PREROUTING -i $PUB_IF -p udp --dport 8964 -j DNAT --to-destination 10.7.0.2:8964

# Allow the traffic to be forwarded
sudo iptables -A FORWARD -i $PUB_IF -o $WG_IF -p udp --dport 8964 -d 10.7.0.2 -j ACCEPT

# Masquerade (so return packets go back through VPS)
sudo iptables -t nat -A POSTROUTING -o $WG_IF -p udp --dport 8964 -d 10.7.0.2 -j MASQUERADE
# check status
sudo iptables -t nat -L -n -v
sudo iptables -L -n -v

make pupeteer work on arm64 (raspberry pi or orangepi)

1. Install deps

sudo apt install chromium-browser chromium-codecs-ffmpeg

and specify flags and path

const browser = await puppeteer.launch({
          headless: true,
          executablePath: '/usr/bin/chromium-browser',
          args: ['--no-sandbox', '--disable-setuid-sandbox']
  });

Emulate Display for pupeteer

in non headless mode you can Install xvfb

sudo apt install xvfb x11-apps x11-xkb-utils libx11-6 libx11-xcb1

Then run the following command

Xvfb -ac :99 -screen 0 1280x1024x16 & export DISPLAY=:99

Enable port forwarding in linux

sysctl -w net.ipv4.ip_forward=1

Routing rules

iptables -t nat -A PREROUTING -p tcp --dport 3124 -j DNAT --to-destination 10.7.0.3:80
iptables -t nat -A POSTROUTING -j MASQUERADE

List all iptables nat

iptables -L -n -t nat

Flush nat changes

iptables -t nat -F && iptables -F

start up wireguard

sudo wg-quick up wg0

stop wireguard

sudo wg-quick down wg0

link wireguard for linux

sudo install -o root -g root -m 600 ~/Downloads/desktop.conf /etc/wireguard/wg0.conf

show wireguard status

sudo wg show

Add on System Startup

sudo systemctl enable wg-quick@wg0.service
sudo systemctl daemon-reload
sudo systemctl start wg-quick@wg0

in case openresolv not found

sudo apt install openresolv

Virtualbox local-remote host setup guide

• create two adapters that is adapter1 with NAT and adapter 2 with host only network lets say vboxnet0 with ip range as (192.168.56.3/3) lower and upper respectively.

Now on guest machine perform following actions

• copy yaml below to /etc/netplan/00-installer-config.yaml

network:
  ethernets:
    enp0s3:
      dhcp4: true
    enp0s7:
      addresses:
        - 192.168.57.1/24
      dhcp4: no
    enp0s8:
      addresses:
        - 192.168.56.1/24
      dhcp4: no
  version: 2

then finalize

sudo netplan try
sudo netplan generate
sudo netplan apply