--- title: "#netfilter articles | Hashnode" description: "Explore 7 articles tagged #netfilter on Hashnode. Tutorials, guides, and how-tos from the community." url: "https://hashnode.com/tag/netfilter" --- Tag # #netfilter 7 posts · 1 followers [Kaustubh Awasthi](https://hashnode.com/@kawasthi2889) · [4d ago](https://hashnode.com/posts/the-docker-ufw-bypass-why-your-protected-ports-are-wide-open-to-the-internet/6af0701a824ca175265c8857) ### [The Docker UFW Bypass: Why Your "Protected" Ports Are Wide Open to the Internet](https://network2889.hashnode.dev/the-docker-ufw-bypass-why-your-protected-ports-are-wide-open-to-the-internet?utm_source=hashnode&utm_medium=feed) Tracing Netfilter packet paths through PREROUTING and FORWARD to explain why UFW rules get bypassed 5 min read · [network2889.hashnode.dev](https://network2889.hashnode.dev/the-docker-ufw-bypass-why-your-protected-ports-are-wide-open-to-the-internet?utm_source=hashnode&utm_medium=feed) [Ronald Bartels](https://hashnode.com/@Mastelek) · [Mar 3, 2025](https://hashnode.com/posts/netfilter-the-backbone-of-linux-packet-filtering/67c5ec51f1de1fc3d95716e6) ### [Netfilter | The Backbone of Linux Packet Filtering 🚀🔥💡](https://hubandspoke.amastelek.com/netfilter-the-backbone-of-linux-packet-filtering?utm_source=hashnode&utm_medium=feed) Discover how Netfilter supports Linux's network security with packet filtering & NAT 4 min read · [hubandspoke.amastelek.com](https://hubandspoke.amastelek.com/netfilter-the-backbone-of-linux-packet-filtering?utm_source=hashnode&utm_medium=feed) [Ronald Bartels](https://hashnode.com/@Mastelek) · [Sep 19, 2024](https://hashnode.com/posts/breaking-the-misrepresentation-netfilter-as-a-powerful-on-prem-firewall-solution/66ec5c70d4de1eb28f944138) ### [💔Breaking the Misrepresentation | Netfilter as a Powerful On-Prem Firewall Solution💪](https://hubandspoke.amastelek.com/breaking-the-misrepresentation-netfilter-as-a-powerful-on-prem-firewall-solution?utm_source=hashnode&utm_medium=feed) Why Netfilter is a Strong Competitor to High-Cost Proprietary Firewalls in Network Security 5 min read · [hubandspoke.amastelek.com](https://hubandspoke.amastelek.com/breaking-the-misrepresentation-netfilter-as-a-powerful-on-prem-firewall-solution?utm_source=hashnode&utm_medium=feed) [Ronald Bartels](https://hashnode.com/@Mastelek) · [May 1, 2024](https://hashnode.com/posts/cntgate-script-to-block-access-to-all-countries-except-south-africa-for-a-host/6632bb7a5e6e05ce9bf9040e) ### [🇿🇦 cntgate - script to block access to all countries except South Africa for a host 📜](https://hubandspoke.amastelek.com/cntgate-script-to-block-access-to-all-countries-except-south-africa-for-a-host?utm_source=hashnode&utm_medium=feed) Script to accept only South African connections on a Linux host using nftables 5 min read · [hubandspoke.amastelek.com](https://hubandspoke.amastelek.com/cntgate-script-to-block-access-to-all-countries-except-south-africa-for-a-host?utm_source=hashnode&utm_medium=feed) [Ronald Bartels](https://hashnode.com/@Mastelek) · [Apr 29, 2024](https://hashnode.com/posts/threat-intelligence-script-updated-for-use-with-nftables/662fc318624d48708ca1650c) ### [🛡️🔒Threat intelligence script updated for use with nftables🗜️](https://hubandspoke.amastelek.com/threat-intelligence-script-updated-for-use-with-nftables?utm_source=hashnode&utm_medium=feed) 🔥 Enhance your network security with this article on the extra threat intelligence script installed on SD-WAN aggregators! 🚀 Learn how this powerful script helps scrub level 1 threats, ensuring your network stays protected from potential risks. Don't leave your network vulnerable – dive into our article now to discover how to bolster your security defenses!🛡️🔒 6 min read · [hubandspoke.amastelek.com](https://hubandspoke.amastelek.com/threat-intelligence-script-updated-for-use-with-nftables?utm_source=hashnode&utm_medium=feed) [Ronald Bartels](https://hashnode.com/@Mastelek) · [Apr 28, 2024](https://hashnode.com/posts/dnsgate-script-to-block-access-to-doh-so-that-a-business-is-able-to-implement-content-filtering/662df4202eabebebfce6d58e) ### [🌉DNSgate - Script to block access to DoH so that a Business is able to implement Content Filtering 🍴](https://hubandspoke.amastelek.com/dnsgate-script-to-block-access-to-doh-so-that-a-business-is-able-to-implement-content-filtering?utm_source=hashnode&utm_medium=feed) 🔒 Secure your Linux network with DNSgate: Block DNS over HTTPS easily! 5 min read · [hubandspoke.amastelek.com](https://hubandspoke.amastelek.com/dnsgate-script-to-block-access-to-doh-so-that-a-business-is-able-to-implement-content-filtering?utm_source=hashnode&utm_medium=feed) [Jay Miracola](https://hashnode.com/@miracola) · [Feb 9, 2024](https://hashnode.com/posts/how-conntrack-could-be-limiting-your-k8s-gateway/65c666cfd685b5910f9bd3b0) ### [How conntrack Could Be Limiting Your k8s Gateway](https://blog.miraco.la/how-conntrack-could-be-limiting-your-k8s-gateway?utm_source=hashnode&utm_medium=feed) Under high load in specific scenarios, a Kubernetes gateway may be limited by more than just its obvious CPU and Memory limits or requests if Karpenter is aggressively sizing the node (a different topic!). You may be hitting a wall in conntrack exhau... 3 min read · [blog.miraco.la](https://blog.miraco.la/how-conntrack-could-be-limiting-your-k8s-gateway?utm_source=hashnode&utm_medium=feed)