TCP MD5

TCP_MD5 (RFC 2385) is something that doesn’t come up often. There’s a couple fo reasons for that, good and bad.

I used it with tlssh, but this should explain why I didn’t enable it by default.

What it is

In short it’s a TCP option that adds an MD5-based signature to every TCP packet. It signs the source and destination IP address, and the ports, and the payload. That way the data is both authenticated and integrity protected.

When an endpoint enables TCP MD5, all unsigned packets (including SYN packets) are silently dropped. For a signed connection it’s not even possible for an eavesdropper to reset the connection, since the RST would need to be signed.

It’s used by the BGP protocol to set a password on the connection, instead of sending the password in the handshake. If the password doesn’t match the TCP connection doesn’t even establish.

But outside of BGP it’s essentially not used, which is a shame. If we could enable it for any TCP service it’d add a preshared key and completely replace the silly port knocking. It probably couldn’t replace user passwords, but it could add a layer and greatly reduce attack surface much Continue reading

Cisco Networking Trends Report: ‘Intent-Based Networking Is Coming’

Worth Reading: Hard Work

Seth Godin published an interesting article on the value of hard work (and what hard work really is). Go and read it first, then we’ll translate it into networking terms.

Already back? Good, let’s go.

The first worker is a traditional networking technician (it wouldn’t be fair to call him an engineer) – he’s busy configuring VLANs, ACLs, firewall rules… the whole day.

Why Micron is Getting into the AI Accelerator Business

Micron has a habit of building interesting research prototypes that offer a vague hope of commercialization for the sheer purpose of learning how to make its own memory and storage subsystem approaches more tuned to next generation applications. …

Why Micron is Getting into the AI Accelerator Business was written by Nicole Hemsoth at The Next Platform.

AWS Invests In Iron And People To Court Enterprises

In the early years of Amazon Web Services, the collection of compute, storage, networking, and platform services (database, analytics, and such) were so good that Amazon, its parent company, did not have to spend a lot of money on sales and marketing to get startups to flock in droves to this public cloud to use it as their computing platform. …

AWS Invests In Iron And People To Court Enterprises was written by Timothy Prickett Morgan at The Next Platform.

Heavy Networking 481: Enhancing Cloud Security With Network Detection And Response From ExtraHop (Sponsored)

ExtraHop is our sponsor for today's Heavy Networking podcast. We dive into Network Detection and Response (NDR) with CTO and co-founder Jesse Rothstein. We explore how to enhance your security posture with NDR, how to use it in the cloud, ExtraHop's ability to take advantage of native cloud traffic mirroring, how ExtraHop deals with encrypted traffic, and more.

The post Heavy Networking 481: Enhancing Cloud Security With Network Detection And Response From ExtraHop (Sponsored) appeared first on Packet Pushers.

Slow Service Provider Sales Muddle Juniper’s Q3 Earnings

Cloud Wars: Amazon, Microsoft Report Declining Cloud Growth

Verizon Touts 5G Scenarios Amid ‘Worrisome Signs’

Hyperscalers And Cloud Builders Resume Their Spending Spree

After two and a half quarters of tightening the purse strings, the world’s largest consumers of infrastructure – the eight major hyperscalers and cloud builders – plus their peers in the adjacent communications service provider space all started spending money on servers and storage again, and Intel can breathe a sigh of relief as it works to get its 10 nanometer manufacturing on track for the delivery of “Ice Lake” Xeon SP processors sometime in the second half of next year. …

Hyperscalers And Cloud Builders Resume Their Spending Spree was written by Timothy Prickett Morgan at The Next Platform.

Stuff The Internet Says On Scalability For October 25th, 2019

 Wake up! It's HighScalability time:

Number Stuff: 

The End of SD-WAN’s Party In China

As I was listening to Network Break Episode 257 from my friends at Packet Pushers, I heard Greg and Drew talking about a new development in China that could be the end of SD-WAN’s big influence there.

China has a new policy in place, according to Axios, that enforces a stricter cybersecurity stance for companies. Companies doing business in China or with offices in China must now allow Chinese officials to get into their networks to check for security issues as well as verifying the supply chain for network security.

In essence, this is saying that Chinese officials can have access to your networks at any time to check for security threats. But the subtext is a little less clear. Do they get to control the CPE as well? What about security constructs like VPNs? This article seems to indicate that as of January 1, 2020, there will be no intra-company VPNs authorized by any companies in China, whether Chinese or foreign businesses in China.

Tunnel Collapse

I talked with a company doing some SD-WAN rollouts globally in China all the way back in 2018. One of the things that was brought up in that interview was that Continue reading

So, what exactly is NFA?

The post So, what exactly is NFA? appeared first on Noction.

Nominations Now Open for 2020 Internet Society Board of Trustees Elections

The Internet Society Nominations Committee is now inviting nominations for candidates to serve on the Board of Trustees.

The Board provides strategic direction, inspiration, and oversight to advance the Internet Society’s mission of preserving the open, globally-connected, trustworthy and secure Internet for everyone.

In 2020 Chapters will elect two (2) Trustees; Organization Members will elect one (1) Trustee; and the IETF will appoint one (1) Trustee. The term of office is 3 years, beginning in August 2020 and ending mid-year 2023.

The Internet Society is a global non-profit organization that champions the open Internet for everyone. With offices in Washington, DC, USA and Geneva, Switzerland, as well as regional bureaus throughout the world, it is dedicated to ensuring the open development, evolution, and use of the Internet for the benefit of people globally. ISOC is also the organizational home of the Internet Engineering Task Force (IETF) and other Internet-related bodies who together play a critical role in ensuring that the Internet develops in a stable and open manner. ISOC has more than 100 Organization Members, over 130 Chapters and Special Interest Groups, and more than 60,000 individual members that play a role in driving the mission and work of the Continue reading

Noction Flow Analyzer is now in Open Beta

The post Noction Flow Analyzer is now in Open Beta appeared first on Noction.

Weekly Wrap: Ex-Cisco Execs Launch Pensando, Target Amazon

Sprint Rouses IoT Offensive as CEO Skips MWC LA Keynote

Public keys are not enough for SSH security

If your organization uses SSH public keys, it’s entirely possible you have already mislaid one. There is a file sitting in a backup or on a former employee’s computer which grants the holder access to your infrastructure. If you share SSH keys between employees it’s likely only a few keys are enough to give an attacker access to your entire system. If you don’t share them, it’s likely your team has generated so many keys you long lost track of at least one.

If an attacker can breach a single one of your client devices it’s likely there is a known_hosts file which lists every target which can be trivially reached with the keys the machine already contains. If someone is able to compromise a team member’s laptop, they could use keys on the device that lack password protection to reach sensitive destinations.

Should that happen, how would you respond and revoke the lost SSH key? Do you have an accounting of the keys which have been generated? Do you rotate SSH keys? How do you manage that across an entire organization so consumed with serving customers that security has to be effortless to be adopted?

Cloudflare Access launched support Continue reading

NICT successfully demos petabit-per-second network node

Petabit-class networks will support more than 100-times the capacity of existing networks, according to scientists who have just demonstrated an optical switching rig designed to handle the significant amounts of data that would pour through future petabit cables. One petabit is equal to a thousand terabits, or a million gigabits.Researchers at the National Institute of Information and Communications Technology (NICT) in Japan routed signals with capacities ranging from 10 terabits per second to 1 petabit per second through their node. Those kinds of capacities, which could send 8K resolution video to 10 million people simultaneously, are going to be needed for future broadband video streaming and Internet of Things at scale, researchers believe. In-data-center applications and backhaul could benefit.To read this article in full, please click here

NICT successfully demos petabit-per-second network node

Petabit-class networks will support more than 100-times the capacity of existing networks, according to scientists who have just demonstrated an optical switching rig designed to handle the significant amounts of data that would pour through future petabit cables. One petabit is equal to a thousand terabits, or a million gigabits.Researchers at the National Institute of Information and Communications Technology (NICT) in Japan routed signals with capacities ranging from 10 terabits per second to 1 petabit per second through their node. Those kinds of capacities, which could send 8K resolution video to 10 million people simultaneously, are going to be needed for future broadband video streaming and Internet of Things at scale, researchers believe. In-data-center applications and backhaul could benefit.To read this article in full, please click here