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[Ubuntu/NAT] Configure NAT on Ubuntu Server

Posted on August 23, 2022 By nim No Comments on [Ubuntu/NAT] Configure NAT on Ubuntu Server

OK! Bài hôm nay mình muốn biến 1 con Ubuntu Server thành Nat Outbound – Internet Gateway

Và mình đã tham khảo từ 2 bài biết này
https://linuxhint.com/configure-nat-on-ubuntu/
https://www.linuxsysadmins.com/setup-a-linux-server-as-a-nat-router/

Đơn giản traffic đi vào card tun0 và đi ra bằng card ens33 – NAT
sudo apt install iptables-persistent

vi /etc/sysctl.conf
##edit
# Uncomment the next line to enable packet forwarding for IPv4
net.ipv4.ip_forward=1
sysctl -p /etc/sysctl.conf

sudo iptables -L
sudo iptables -t nat -A POSTROUTING -o ens33 -j MASQUERADE
sudo iptables -t nat -L
sudo sh -c "iptables-save > /etc/iptables/rules.v4"

Giờ bạn cần route các IP cần thiết sang card tun0 là ok

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