Why Do INPUT Rules Block My Server’s Outbound Connections?
I'm trying to tighten a server's firewall rules without accidentally locking myself out of remote administration. Instead of using a default DROP policy, I inserted these rules near…
iptables
Why Do These iptables INPUT Rules Break Outbound Connections?
I'm trying to harden a server with iptables without accidentally locking myself out of remote access. Instead of using a default DROP policy, I inserted these rules near…
How can I access a Docker service bound to localhost through an SSH tunnel?
I'm running Uptime Kuma in Docker with the host port bound only to localhost: 127.0.0.1:3005 -> 3001/tcp. I want the service to remain inaccessible from the public network…
How can I access a Docker service bound to localhost through an SSH tunnel?
I'm running Uptime Kuma in Docker with the host port mapped only to localhost: 127.0.0.1:3005 on the host forwarding to port 3001 in the container. I want the…
Is nftables really better than iptables, or just harder to learn?
After upgrading a Rocky Linux 10 server, I found that the newest kernel no longer loads the legacy iptables modules I was using. I started looking at nftables,…
Why doesn’t iptables MASQUERADE hide my API container’s IP in Docker Compose?
I'm trying to simulate an AWS-style NAT gateway with Docker Compose. The nat-gateway container is attached to both a private and a public bridge network, while the api…
How to Block an IP Address with iptables in Docker?
I'm trying to block a specific IP address while using Docker, but I'm running into issues because Docker integrates with iptables. I attempted to use UFW, but it…
How to Set Up iptables Rules for Docker on Raspberry Pi?
Hey folks! I've recently installed Docker on my Raspberry Pi 5, and everything seems to be running smoothly. However, when I enable iptables, my website loses internet access.…
Best UI Tools for Managing Firewall Rules with Iptables
I'm curious if anyone uses a user interface to create, manage, or delete iptables rules across a large number of servers. I'm looking for tools or UIs that…
How can I isolate my Docker containers while still allowing outbound access?
I'm starting to get into Docker networking and want to securely isolate my application stacks. I've hit a snag because some of my services need to connect to…
How Do I Get Docker to Work with UFW Firewall?
I'm having a tough time getting Docker to function properly behind my UFW firewall. I've come across many discussions about Docker altering iptables, which leads to conflicts with…
Why Can't I Access My Docker Bridge Network After the Update?
I've been facing a problem recently with my home server running Docker. I have several containers connected to a bridge network (10.4.0.0/24) that I've set up for local…
Help! Docker Won't Start on My Raspberry Pi
I've been using Docker on various devices without issues, but I'm having trouble on my Raspberry Pi 4B. After following the official installation instructions, everything seemed fine, but…
How Do Packets Reach a Docker Container Without Iptables?
I recently decided to switch from using `iptables` to `nftables` for managing my Docker firewall rules. However, I'm running into some confusion about how traffic still reaches my…
How Does this DaemonSet Affect iptables Across the Cluster?
Hey everyone! I recently deployed a DaemonSet related to the nginx CVE-2025-1974, which you can check out [here](https://blog.abhimanyu-saharan.com/posts/ingress-nginx-cve-2025-1974-what-it-is-and-how-to-fix-it). The strange part is that while this DaemonSet modifies iptables…