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Maintaining a high-density connection pool on Linux requires a balance between resource reclamation and connection stability. When peers crash or network partitions occur without a proper FIN/RST handshake, sockets can remain in an ESTABLISHED state indefinitely, leading to pool exhaustion. The Linux kernel provides TCP Keepalive mechanisms via net.ipv4.tcp_
I pulled off my patch panel today to discover that I had originally punched down the green pair (3/6) incorrectly? I never noticed because it all just worked? If it matters, the wiring is CAT6, in a CAT6A patch panel. I pulled off one of the wall jacks to ensure it’s wired correctly... and it is. I just want to know why it worked? The panel in question:
Fedora utilizes systemd-resolved as the primary DNS manager, operating a stub resolver at 127.0.0.53 . While this manages per-link DNS routing and local caching, a behavioral discrepancy occurs when applications bypass the D-Bus interface to read /etc/resolv.conf directly. The standard configuration relies on /etc/resolv.conf being a symlink to /run/systemd/
I've written a custom jail and filter in fail2ban for logging into my service. The log file is located in /var/log/motion/motion.log and a failed login generates a line like this: [0:ml1] [ALR] [STR] [Nov 02 11:42:59] handle_basic_auth: motion-stream - failed auth attempt from <ip> My jail in /etc/fail2ban/jail.local looks like this: [motion-auth] enab
I have a DB server running as a Compute Engine VM, and an API running on Cloud Run. Both are part of the same project. I want the DB VM to only be accessible from the Cloud Run code. At first I thought this should just work because the firewall has a "default-allow-internal" rule that should apply to every machine in the project. However I was still getting
Suppose that test.example.com don't exists and gives NXDOMAIN when runnning dig on it , but i know that subdomain.test.example.com exists and gives NOERROR when doing the same, is there a way to check that a deep subdomain exists even though the intermediate subdomain may not be there necessarily. Specifically, I'm looking for hints when probing or querying
I have a Centos7 VM instance running in Azure. It has a public IPv4 address reachable from the internet. I would like to add a public IPv6 address to this instance's network interface but I cannot figure out how to do this. There does not seem to be a way to add it to the interface from the portal. I have consulted the documentation but it seems to have conf
Setup: Ubuntu 20.04 on a box with 5 physical ethernet ports (let's call them eth1 - eth5). I have joined them all to a bridge ("br0") with brctl and they can all ping each other. What I'm trying to do: allow eth2 - eth5 to all continue chatting freely with each other while limiting what can come in via eth1. (Ultimately eth1 will be the "outside connection"
I see Google has 8.8.8.8 and CloudFlare has 1.1.1.1 . How do I get myself a distinctive IP address? What's involved in acquiring something that has a pattern in it?
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