Network grep
Thresher
Ngrep is a pattern-matching tool that sorts the wheat from the chaff and doubles as a lightweight packet sniffer.
You might want to inspect your network at a very detailed level for a number of legitimate reasons. Much of the time, it’s to debug an application that’s misbehaving and connecting to a server on the wrong port, or maybe a colleague has noticed a slowdown on a particular network link, and you need to diagnose where the sudden flood of multidirectional traffic is coming from.
On the other hand, you might need to check the exact nature of an attack and perform some realtime forensic diagnostics to circumvent it. Leaving the networking aspects aside for a moment, even an admin solely responsible for systems and not networks (an exceptionally rare remit these days, admittedly) needs a highly functional packet sniffer available at all times. Because systems rely so heavily on connectivity for multifaceted Internet usage, it’s imperative for admins to be able to inspect the contents of the network deeply and interpret the results proficiently.
Buy this article as PDF
(incl. VAT)
Buy Linux Magazine
US / Canada
UK / Australia
Subscribe to our Linux Newsletters
Find Linux and Open Source Jobs
Subscribe to our ADMIN Newsletters
Support Our Work
Linux Magazine content is made possible with support from readers like you. Please consider contributing when you’ve found an article to be beneficial.
News
-
Wayland 1.24 Released with Fixes and New Features
Wayland continues to move forward, while X11 slowly vanishes into the shadows, and the latest release includes plenty of improvements.
-
Bugs Found in sudo
Two critical flaws allow users to gain access to root privileges.
-
Fedora Continues 32-Bit Support
In a move that should come as a relief to some portions of the Linux community, Fedora will continue supporting 32-bit architecture.
-
Linux Kernel 6.17 Drops bcachefs
After a clash over some late fixes and disagreements between bcachefs's lead developer and Linus Torvalds, bachefs is out.
-
ONLYOFFICE v9 Embraces AI
Like nearly all office suites on the market (except LibreOffice), ONLYOFFICE has decided to go the AI route.
-
Two Local Privilege Escalation Flaws Discovered in Linux
Qualys researchers have discovered two local privilege escalation vulnerabilities that allow hackers to gain root privileges on major Linux distributions.
-
New TUXEDO InfinityBook Pro Powered by AMD Ryzen AI 300
The TUXEDO InfinityBook Pro 14 Gen10 offers serious power that is ready for your business, development, or entertainment needs.
-
LibreOffice Tested as Possible Office 365 Alternative
Another major organization has decided to test the possibility of migrating from Microsoft's Office 365 to LibreOffice.
-
Linux Mint 20 Reaches EOL
With Linux Mint 20 at its end of life, the time has arrived to upgrade to Linux Mint 22.
-
TuxCare Announces Support for AlmaLinux 9.2
Thanks to TuxCare, AlmaLinux 9.2 (and soon version 9.6) now enjoys years of ongoing patching and compliance.