Author Topic: Allowing Port 0 and 0.0.0.0/8? [Solved]  (Read 145 times)

Offline 5Lqep

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Allowing Port 0 and 0.0.0.0/8? [Solved]
« on: September 21, 2022, 06:58:52 AM »
What is wrong with my global Rules?
Does allowing port 0 also allows IGMP and mDNS. I have blocked both in global rules
Do I have to allow port 0

Explain this According to Wikipedia

Port 0 - In programming APIs (not in communication between hosts), requests a system-allocated (dynamic) port
https://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers#:~:text=0-,Reserved,-In%20programming%20APIs

0.0.0.0/8 - Current network (Wikipedia is vague and wrong for this)
https://en.wikipedia.org/wiki/Reserved_IP_addresses#:~:text=Description-,0.0.0.0/8,-0.0.0.0%E2%80%930.255.255.255
« Last Edit: October 06, 2022, 03:21:57 PM by 5Lqep »

Offline futuretech

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Re: What is wrong with my global Rules? Allowing Port 0?
« Reply #1 on: September 21, 2022, 11:25:56 AM »
Using port 0 in firewall rules means any port. The 0.0.0.0/8 addresses means any/all IPv4 addresses, so your first logging rule is why you are seeing logged allowed connections.

Offline ZorKas

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Re: Allowing Port 0 and 0.0.0.0/8?
« Reply #2 on: September 22, 2022, 01:38:12 PM »
Do I have to allow port 0

For information about port 0

Port 0 and network security
Network traffic sent over the Internet to hosts listening on port 0 can be generated by network attackers or accidentally by incorrectly programmed applications. Reply messages generated by hosts in response to port 0 traffic can help hackers learn more about the behavior and potential network vulnerabilities of these devices.
Many Internet Service Providers (ISPs) block port 0 traffic (incoming and outgoing messages) to guard against these exploits.

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