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linux - iptables error: unknown option --dport - Server Fault First give a -p option like -p tcp or -p udp. Examples: iptables -A INPUT -p tcp --dport 22 -m state --state NEW -j DROP iptables -A INPUT -p udp --dport 53 --sport 1024:65535 -j ACCEPT You could also try -p all but I've never done that and don't find too much support for it in the examples.

linux - Iptables: "-p udp --state ESTABLISHED" - Server Fault let's look at these two iptables rules which are often used to allow outgoing DNS: iptables -A OUTPUT -p udp --sport 1024:65535 --dport 53 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A

What port should I open to allow remote desktop? - Server Fault @BrianZ This is Windows 7/8/10 and to get there, just open Start Menu search for "Firewall" and click on "Advanced Settings" on the left-side panel, click on Inbound Rules on left-side panel and on the main panel find Remote Desktop - User Mode (TCP-In) and Remote Desktop - User Mode (UDP-In) and Allow edge traversal for both of them.

linux - How can I port forward with iptables? - Server Fault How about this: I'm a programmer trying to set up an environment so I can debug my server application in eclipse being called from the innernet. Close enough?

How to match port range using u32 filter - Server Fault with "u32 match ip sport 80" in Linux tc I can match port 80, but how can I match a port range 10000 - 20000 ?

What is the correct way to open a range of ports in iptables What you've been told is right, although you've written it wrong (you've forgotten --dport). iptables -A INPUT -p tcp --dport 1000:2000 will open up inbound traffic to TCP ports 1000 to 2000 inclusive. -m multiport --dports is only needed if the range you want to open is not continuous, eg -m multiport --dports 80,443, which will open up HTTP and HTTPS only - not the ones in between. Note that ...

iptables - How to open port 8080? - Server Fault -A OUTPUT -p tcp -m tcp --sport 8080 -m state --state NEW,ESTABLISHED -j ACCEPT Because your OUTPUT rules block output packets to non-allowed ports, it's allow only access to port 8080.

ubuntu - Iptables allow DNS resolution - Server Fault At first glance you're only allowing DNS responses to be received and don't create any DNS related rules in the OUTPUT chain to actually allow sending DNS queries out. You current rules: #DNS resolution input and output iptables -A INPUT -p udp --dport 53 -d 8.8.8.8,8.8.4.4 -j ACCEPT ^^^^^ iptables -A INPUT -p udp --sport 53 -s 8.8.8.8,8.8.4.4 -j ACCEPT ^^^^^ Additionally, DNS can also use TCP ...

ubuntu - iptables input, output, forward - Server Fault INPUT: packets coming from the network and going to your server. OUTPUT: packets originating from your server and going to the network. FORWARD: packets forwarded by your server, if/when it acts as a router between different networks. In order to allow SSH access to your server, you have to accept the traffic in the INPUT chain.