iptables (and/or the successor tool nftables) is the user-space utility program that allows a system administrator to configure the IP packet filter rules of the Linux kernel firewall, which is implemented as different Netfilter modules. (summary from Wikipedia) Since iptables and nftables are a user-space utility … See more A little background: To be the most efficient the rules for the packet filters in the Linux kernel are also stored with the values for the IP protocol, port numbers and IP … See more That is generally speaking safe and does not lead to any unnecessary confusion. The file /etc/protocols is used by default to translate protocol names to protocol … See more The default file /etc/networks could be used to translate network names used in the destinations and/or sources. At least according to the manual, I have … See more Although safe this also seems to generate some confusion. The file /etc/services is used to translate the service name to port number when instead of a port … See more WebThe iptables service starts before any DNS-related services when a Linux system is booted. This means that firewall rules can only reference numeric IP addresses (for example, 192.168.0.1). Domain names (for example, host.example.com) in such rules produce errors.
linux - iptables - use service name or port number, IP …
WebJan 27, 2024 · Iptables is easy to use and requires almost no maintenance. It requires no daemon restarts and it is available for all Linux systems. One of the first things you … WebAug 14, 2014 · - name: Allow nginx firewall ufw: proto=tcp port=80 rule=allow - name: Allow nginx ssl firewall ufw: proto=tcp port=443 rule=allow So all my nginx servers have ports 80 and 443 opened. This way you can build whatever common configuration you want and add additional rules in more specific roles. dwight newspaper
iptables(8) - Linux man page - die.net
WebIn most cases, you can use the short module name iptables even without specifying the collections: keyword. However, we recommend you use the FQCN for easy linking to the module documentation and to avoid conflicting with other collections that may have the same module name. ... This can either be a service name or a port number. An inclusive ... WebAug 12, 2024 · add a virtual IP in iptables. When a Kubernetes Service is created a ClusterIP is assigned for that new service. Conceptually, a ClusterIP is a virtual IP. kube-proxy in iptables-mode is responsible for creating iptables rules to handle these virtual IP addresses as described in Virtual IPs and service proxies. Let’s make a simple iptables rule to see … WebThe iptables, ip6tables, ebtables and arptables tools are replaced by nftables-based drop-in replacements with the same name. While external behavior is identical to their legacy counterparts, internally they use nftables with legacy netfilter kernel modules through a compatibility interface where required. dwight nichols obituary