Greg Ferro
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Greg Ferro
Tools: Dropping and Shaping Packets with iptables and tc on Linux
You can drop packets using iptables on a Linux host with some level of randomness. iptables -A INPUT -m statistic --mode random --probability 0.8 -s example.com -p icmp -j DROP I also did not know that Linux has a traffic control tool for packet shaping ‘tc’: tc qdisc change dev eth0 root netem loss 5% […]
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QNA: Breakouts Cables Are Not Splitters
Question on Reddit Ok, this is a weird question and I’ll probably get some flak for this, but is there any real proof that an SFP (1000BASE) transceiver cannot be at the end of a QSFP+ breakout? Afaik QSA type adapters are just splitters but leave the other 3 out as evidenced by how they […]
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Network Dictionary: Greyfield
Define the term 'Greyfield'
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Why Would Cisco Buy Luxtera ?
Cisco announced it is buying Luxtera for $660M. Luxtera make SFP modules for Ethernet switches including the critical laser components. Interesting Things Just before the Christmas break when fewer people are watching. Background of US/China trade problems Cisco get control of part of the supply chain Silicon photonics is about using existing silicon manufacturing processes […]
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Geo IP Databases are Highly Inaccurate
Lots of network monitoring platforms use GeoIP databases to track/monitor sources. These databases are, perhaps, 75% accurate (for some definition of accurate). This is your regular reminder to have a sense of caution about location based on public IP address. John S. and his mother Ann live in the house, which is in Pretoria, the […]
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Percentage of HTTPS (TLS) Encrypted Traffic on the Internet ?
Reviewing a Threat report from Fortinet Networks suggests that 73% of internet traffic is now encrypted. Thats a substantial change in five years for a network protocol. More than I expected but good news that the status quo CAN be changed. I wonder what happened to telcos that were selling data extracted from capturing HTTP […]
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Windstream sells EarthLink consumer internet business
Another nail in the “telco cannot provide customised services” folder. Windstream sells its consumer business: “This transaction enables us to divest a non-core segment and focus exclusively on our two largest business units. In addition, it improves our credit profile and metrics in 2019 and beyond,” said Tony Thomas, president and CEO of Windstream. As […]
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Announcing Heavy Networking
In January 2019, Packet Pushers Weekly Podcast will rebrand to Heavy Networking.
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Response: Modchips, Hardware Implants and Bloomberg falsehoods
This video was presented at the 35C3 conference in Germany last week. The presenter is highly credible on the topic. Hardware implants and supply chain attacks have been in the news recently, but how feasible are they and what can we do about them? In this talk we’ll examine the design of a proof of […]
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AT&T Sells Its Colocation Data Centres
AT&T has finally found a buyer for its colocation business. AT&T Inc announced today that it has completed the sale of its data center colocation operations and assets to Brookfield Infrastructure and its institutional partners (“Brookfield”). The company previously announced a strategic alliance with Brookfield that included the transfer of these operations and assets. Why […]
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Weekly Show 422: Hardware Supply Chains And Trusted Execution
Today's show dives into issues around IT supply chain security and mechanisms such as trusted execution. We examine how they work and how they're implemented, and look at similar measures in routing and switching.
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Response: A Chief Security Concern for Executive Teams
Krebs looked at how many Top 500 companies have security people in executive management roles
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Are Telcos Secure ? Not provably, so No.
Why did we trust telco networks until now ?
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QAA: How Important is it to Understand Hardware Architecture?
This question on reddit For example, I’m going through a Cisco Live presentation on troubleshooting ASR routers, and the first 50 slides or so are completely dedicated to describing the Route Processors, Packet Engines, ASICs, Buffers, etc., and the different paths that packets can take through the hardware. While that’s all obviously important to the […]
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Response: Australian Encryption Laws Explained
Stilgherrian is a long time IT journalist in Australia and trustworthy source for news. This article details the laws that Australia has passed.
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Tools: Dark Mode Chrome Extension
“Eye Care” Add dark mode to Chrome via extension. Source seems to check out. Source Web Site: Dark Reader – https://darkreader.org/ Also has extension for Firefox and Safari. Link: Dark Reader – Chrome Web Store – https://chrome.google.com/webstore/detail/dark-reader/eimadpbcbfnmbkopoojfekhnkhdbieeh/related Side Note: All those years of brightest possible monitors declaiming about number of NITS a screen and now […]
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Weekly Show 420: Real-World Network Design Part 2
The Weekly Show returns to the University of Idaho to continue the real-world network design session we started in Show 418. Today's episode focuses on the university's wireless architecture and design with guests Brian Jemes, Mike Rusca, and Jake Snyder. We cover 5Ghz, PoE, next-gen APs, and more.
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Has Anyone Actually Sued Their Vendor ?
An oft-quoted reason for buying technology from a commercial vendor is legal recourse. If it fails, the company imagines that it could sue the supplier for negligence or reparations. Vendors offer zero guarantees that their products work. If you read the purchase contracts, the customer waives all rights when using the products including the right […]
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Research: The Guidelines On Cyber Security Onboard Ships
This report is good reading and a useful template for writing your own IT security strategy.
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Video: Top 10 Misconceptions About 5G For Beginners
Breaks down the reality and practical considerations so that you can decode whether someone in marketing wrote those hypetastic 5G articles that you see everywhere.
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