OpenVPN TAP adapter MTU in Windows

Recently I was in need of setting up some windows clients to connect to my OpenVPN server. This server running on Linux, uses a specific MTU value (let’s say 1400) to ensure maximum compatibility with different clients over different links.

In addition to the OpenVPN process itself, the kernel must also know about the correct MTU so packet size could be adjusted before reaching the tun/tap interface.

This is very easy to do in Linux. In fact you most likely do not need to do anything at all. OpenVPN will adjusted the MTU of the tun/tap interface while creating it. You can check the interfaces effective MTU by using ip link show or ifconfig command.

The same however can not be said about Windows. In a typical scenario, OpenVPN is not even directly responsible for creating the said interface. Instead, it requires the interface to be already in placed (which is achieved by calling tapinstall.exe during the initial setup) and then it would connect to it.

So even though you have specified your MTU settings in the OpenVPN profile, at least at the time of writing, this does not reflect the MTU of the interface that Windows kernel would Continue reading

HPC System Delays Stall InfiniBand

Enterprise spending on servers was a bit soft in the first quarter, as evidenced by the financial results posted by Intel and by its sometime rival IBM, but the hyperscale and HPC markets, at least when it comes to networking, was a bit soft, according to high-end network chip and equipment maker Mellanox Technologies.

In the first quarter ended March 31, Mellanox had a 4.1 percent revenue decline, to $188.7 million, and because of higher research and development costs, presumably associated with the rollout of 200 Gb/sec Quantum InfiniBand technology (which the company has talked about) and …

HPC System Delays Stall InfiniBand was written by Timothy Prickett Morgan at The Next Platform.

Rambus, Microsoft Put DRAM Into Deep Freeze To Boost Performance

Energy efficiency and operating costs for systems are as important as raw performance in today’s datacenters. Everyone from the largest hyperscalers and high performance computing centers to large enterprises that are sometimes like them are trying squeeze as much performance as they can from their infrastructure while reining in power consumption and the costs associated with keeping it all from overheating.

Throw in the slowing down of Moore’s Law and new emerging workloads like data analytics and machine learning, and the challenge to these organizations becomes apparent.

In response, organizations on the cutting edge have embraced accelerators like GPUs and …

Rambus, Microsoft Put DRAM Into Deep Freeze To Boost Performance was written by Timothy Prickett Morgan at The Next Platform.

Some notes on #MacronLeak

Tonight (Friday May 5 2017) hackers dumped emails (and docs) related to French presidential candidate Emmanuel Macron. He's the anti-Putin candidate running against the pro-Putin Marin Le Pen. I thought I'd write up some notes.


Are they Macron's emails?

No. They are e-mails from members of his staff/supporters, namely Alain Tourret, Pierre Person, Cedric O??, Anne-Christine Lang, and Quentin Lafay.

There are some documents labeled "Macron" which may have been taken from his computer, cloud drive -- his own, or an assistant.


Who done it?

Obviously, everyone assumes that Russian hackers did it, but there's nothing (so far) that points to anybody in particular.

It appears to be the most basic of phishing attacks, which means anyone could've done it, including your neighbor's pimply faced teenager.

Update: Several people [*] have pointed out Trend Micro reporting that Russian/APT28 hackers were targeting Macron back on April 24. Coincidentally, this is also the latest that emails appear in the dump.


What's the hacker's evil plan?

Everyone is proposing theories about the hacker's plan, but the most likely answer is they don't have one. Hacking is opportunistic. They likely targeted everyone in the campaign, and these were the Continue reading

Email dump hits French candidate Macron ahead of election

Another political campaign has been hit by an email dump. This time, the target is French presidential candidate Emmanuel Macron.On Friday, his campaign said a massive and coordinated hack had breached the email inboxes of several staffers. This came after a mysterious user named “EMLEAKS” apparently dumped the stolen data through torrent files on text storage site Pastebin.It’s unclear if the information in the dump is genuine. Allegedly, the dump contains a 9GB trove of emails and photos. The torrent files, which were hosted on Archive.org, are no longer available there.But Macron’s campaign said the leaked files have been spreading over social media as the country prepares to vote for a new president on Sunday.To read this article in full or to leave a comment, please click here

Email dump hits French candidate Macron ahead of election

Another political campaign has been hit by an email dump. This time, the target is French presidential candidate Emmanuel Macron.On Friday, his campaign said a massive and coordinated hack had breached the email inboxes of several staffers. This came after a mysterious user named “EMLEAKS” apparently dumped the stolen data through torrent files on text storage site Pastebin.It’s unclear if the information in the dump is genuine. Allegedly, the dump contains a 9GB trove of emails and photos. The torrent files, which were hosted on Archive.org, are no longer available there.But Macron’s campaign said the leaked files have been spreading over social media as the country prepares to vote for a new president on Sunday.To read this article in full or to leave a comment, please click here

Patch to fix Intel-based PCs with enterprise bug rolls out next week

Next week, PC vendors will start rolling out patches that fix a severe vulnerability found in certain Intel-based business systems, including laptops, making them easier to hack.   Intel on Friday released a new notice urging clients to take steps to secure their systems.The chipmaker has also released a downloadable tool that can help IT administrators and users discover whether a machine they own has the vulnerability.In addition, vendors including Fujitsu, HP, and Lenovo have released lists showing which products are affected and when the patches will roll out. To read this article in full or to leave a comment, please click here

Patch to fix Intel-based PCs with enterprise bug rolls out next week

Next week, PC vendors will start rolling out patches that fix a severe vulnerability found in certain Intel-based business systems, including laptops, making them easier to hack.   Intel on Friday released a new notice urging clients to take steps to secure their systems.The chipmaker has also released a downloadable tool that can help IT administrators and users discover whether a machine they own has the vulnerability.In addition, vendors including Fujitsu, HP, and Lenovo have released lists showing which products are affected and when the patches will roll out. To read this article in full or to leave a comment, please click here

Red Hat nicely positioned for the turn to cloud

Red Hat CEO James Whitehurst kicked off the company’s Summit meeting in Boston this week, which attracted more than 6,000 people, up 20% from last year. Network World Editor in Chief John Dix caught up with Whitehurst at the show for an update on the company’s position and prospects. One of your keynote speakers said 84% of Red Hat customers have cloud deployment strategies. Is the shift to cloud accelerating your business?I do think the shift to cloud is helping. We have data that shows our customers who use cloud actually grow faster in total with us than ones who don’t. The promise of cloud accelerates the Unix-to-Linux migration as people modernize applications to be able to move to cloud -- whether they move immediately or not -- because clouds primarily run Linux. In general, anything that makes people move to a new architecture is good for us because we have a high share of new architecture relative to old. I think that’s a big, big driver.To read this article in full or to leave a comment, please click here

Worth Reading: Commodifying words

Words (and by extension their constituent letters) are as free to utter and use as is the air sustaining life. No one owns them. There is no toll fee to be paid to dictionary makers who curate them. There are, however, two carve-outs from this public domain, namely words and letters businesses use as designations of origin for their marketplace presence, protected by trademark law; and words and letters arranged expressively by authors, protected by copyright law. The rights accruing to persons under these carve-outs — trademark more ancient than copyright (circa 1610) — have their roots in statutory and common law. —CircleID

The post Worth Reading: Commodifying words appeared first on rule 11 reader.

Are next-generation firewalls legacy technology?

A few years ago, next-generation firewalls (NGFWs) came out of nowhere to become a network security staple. These devices combined traditional L3/L4 packet filtering with deep packet inspection, IPS, and other network security services along with knowledge about users and applications. This broad functionality packaging changed the network security paradigm—everyone needed, or at least wanted a NGFW at the perimeter or within the internal network.Fast forward to 2017, and the bloom is coming off the NGFW rose for several reasons: Requirements have changed. NGFWs followed in the footsteps of earlier firewalls—physical appliances installed inline to protect private networks from the public Internet. Back then, mobile and remote office workers VPNed into the corporate network and traffic was backhauled for Internet ingress/egress. This model is changing rapidly, however. As cloud computing, SaaS, mobility and broadband networks evolved, mobile and remote worker connection are often dual homed, offering direct connections to the public internet. Once this happens, NGFWs lose their usefulness, offering no visibility or control of network traffic. Software is eating the world. Remember Marc Andreessen’s famous essay about the rise of software? Ironically, his publication doesn’t dedicate a single word to cybersecurity, but make no mistake, software is eating Continue reading

Are next-generation firewalls legacy technology?

A few years ago, next-generation firewalls (NGFWs) came out of nowhere to become a network security staple. These devices combined traditional L3/L4 packet filtering with deep packet inspection, IPS, and other network security services along with knowledge about users and applications. This broad functionality packaging changed the network security paradigm—everyone needed, or at least wanted a NGFW at the perimeter or within the internal network.Fast forward to 2017, and the bloom is coming off the NGFW rose for several reasons: Requirements have changed. NGFWs followed in the footsteps of earlier firewalls—physical appliances installed inline to protect private networks from the public Internet. Back then, mobile and remote office workers VPNed into the corporate network and traffic was backhauled for Internet ingress/egress. This model is changing rapidly, however. As cloud computing, SaaS, mobility and broadband networks evolved, mobile and remote worker connection are often dual homed, offering direct connections to the public internet. Once this happens, NGFWs lose their usefulness, offering no visibility or control of network traffic. Software is eating the world. Remember Marc Andreessen’s famous essay about the rise of software? Ironically, his publication doesn’t dedicate a single word to cybersecurity, but make no mistake, software is eating Continue reading

39% off Dell Computer Ultrasharp U2415 24.0-Inch Screen LED Monitor – Deal Alert

The Dell Ultrasharp monitor has virtual borderless viewing ideal for a multi-monitor set-up; with more vertical resolution available on the U2415 16:10 monitor . Fully adjustable features like tilt, swivel, height adjust including pivoting both 90 Degree clockwise or counter-clockwise, allowing the thinnest possible edges to be placed side by side . Connect seamlessly to other peripherals simultaneously without compromising on picture quality via digital connectivity. A high current USB 3.0 charging port supplies twice the power for charging and powering BC1.2 compatible devices, and DP1.2 supports multi-stream transport.  This monitor averages 4.5 out of 5 stars from over 1,00 people on Amazon (read reviews). The typical list price has been reduced 39% to just $244.99. See it now on Amazon.To read this article in full or to leave a comment, please click here

40% off Dell Computer Ultrasharp U2415 24.0-Inch Screen LED Monitor – Deal Alert

The Dell Ultrasharp monitor has virtual borderless viewing ideal for a multi-monitor set-up; with more vertical resolution available on the U2415 16:10 monitor . Fully adjustable features like tilt, swivel, height adjust including pivoting both 90 Degree clockwise or counter-clockwise, allowing the thinnest possible edges to be placed side by side . Connect seamlessly to other peripherals simultaneously without compromising on picture quality via digital connectivity. A high current USB 3.0 charging port supplies twice the power for charging and powering BC1.2 compatible devices, and DP1.2 supports multi-stream transport.  This monitor averages 4.5 out of 5 stars from over 1,00 people on Amazon (read reviews). The typical list price has been reduced 40% to just $239.85. See it now on Amazon.To read this article in full or to leave a comment, please click here

Chromebook shipments surge by 38 percent, cutting into Windows 10 PCs

In a slowing PC market, Chromebooks siphoned market share away from Windows PCs in 2016 as their popularity grew outside the education market.Chromebook shipments grew by a stunning 38 percent in 2016 compared to 2015. Gartner estimated 9.4 million Chromebooks shipped, compared to 6.8 million units in 2015.The number is just a fraction of overall PC shipments, but growth came in an otherwise down PC market. Overall PC shipments in 2016 were about 270 million units, a decline of about 6.2 percent, according to Gartner.Looking forward, 2016 may go down as the best year ever for Chromebook shipment growth. Gartner is estimating shipments to continue growing in the coming years but at a slower pace.To read this article in full or to leave a comment, please click here

Fatboy ransomware adjusts demands based on local price of a Big Mac

A new ransomware-for-hire scheme called Fatboy adjusts the ransom it charges based on international exchange rates so it’s more likely the victims get hit for the largest amount they can reasonably pay.Posted on Exploit, a Russian-language online forum, Fatboy automatically adjusts ransom demands according to where the victim is located, according to the Recorded Future blog.That adjustment is based on the Big Mac Index, which was created by The Economist as a way to show whether official international monetary exchange rates line up with the price charged for a certain product – the Big Mac burger sold by McDonald’s – from country to country. The index tells whether currencies are overvalued or undervalued based on what McDonald’s charges in each country.To read this article in full or to leave a comment, please click here

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