How to install iptables as a systemd service and allow outgoing connection to Synology NAS

Subject: How to install iptables as a systemd service and allow outgoing connection to Synology NAS


Author: Mr. Turritopsis Dohrnii Teo En Ming (TARGETED INDIVIDUAL)

Country: Singapore

Date: 22 August 2021 Sunday Singapore Time


Type of Publication: Plain Text


Document version: 20210822.01


DETAILED STEPS

===============


Save the existing iptables firewall rules to a file named /etc/sysconfig/iptables.


# iptables-save > /etc/sysconfig/iptables


Add the following lines to /etc/sysconfig/iptables, to allow outgoing connection to Synology NAS.

Assume 192.168.1.5 is the IP address of the Synology NAS.


# nano /etc/sysconfig/iptables


-A OUTPUT -d 192.168.1.5/32 ! -o lo -p tcp -m tcp --dport 135:139 -j ACCEPT

-A OUTPUT -d 192.168.1.5/32 ! -o lo -p udp -m udp --dport 135:139 -j ACCEPT

-A OUTPUT -d 192.168.1.5/32 ! -o lo -p tcp -m tcp --sport 135:139 -j ACCEPT

-A OUTPUT -d 192.168.1.5/32 ! -o lo -p udp -m udp --sport 135:139 -j ACCEPT

-A OUTPUT -d 192.168.1.5/32 ! -o lo -p tcp -m tcp --dport 445 -j ACCEPT

-A OUTPUT -d 192.168.1.5/32 ! -o lo -p udp -m udp --dport 445 -j ACCEPT

-A OUTPUT -d 192.168.1.5/32 ! -o lo -p tcp -m tcp --sport 445 -j ACCEPT

-A OUTPUT -d 192.168.1.5/32 ! -o lo -p udp -m udp --sport 445 -j ACCEPT


Reload iptables firewall rules from /etc/sysconfig/iptables.


# iptables-restore < /etc/sysconfig/iptables


Install iptables systemd service.


# yum install iptables-services


Start iptables systemd service.


# systemctl start iptables


Allow iptables systemd service to start across reboots.


# systemctl enable iptables


# service iptables save


Above command will save iptables firewall rules into /etc/sysconfig/iptables.


Mr. Turritopsis Dohrnii Teo En Ming, 43 years old as of 22 August 2021, is a TARGETED INDIVIDUAL living in Singapore. He is an IT Consultant with a System Integrator (SI)/computer firm in Singapore. He is an IT enthusiast.





REFERENCES

===========


[1] https://marc.info/?l=netfilter&m=162962284603250&w=2

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