jwbensley

8 ms·

31.
by jwbensley 8y ago
NetEng here, I'm usually troubleshooting lower layer issues (Ethernet, MPLS, IP) than HTTP however, tcpdump is one of my go-to tools every time. If anyone is interested I've made some notes here: https://null.53bits.co.
32.
by jwbensley 8y ago
BBC R&D gave a talk on this very project a couple of years ago at a UKNOF meeting, it was very interesting: https://m.youtube.com/watch?v=yLL8wl8YUwA
33.
by jwbensley 8y ago
A lot of people in here are talking about securing their DNS setups but not their BGP setups. For any BGP operators out there, you could automate your inbound/outbound BGP prefix filters using IRR/LIR databases, peeringdb.com, RAD
34.
by jwbensley 8y ago
iPerf but for Ethernet/MPLS/layer 2. This is at the more serious end of the scale and something I've been working on for a while now. I use it to test a link or device speed at different frame sizes, check that different Ethe
35.
by jwbensley 9y ago
A great talk, thanks! This is a great talk from another networking legend: "Network Protocols: Myths, Missteps, and Mysteries" by Radia Perlman. I love her personality and sense of humor, and it has tech content that is completely
36.
by jwbensley 9y ago
Are you saying humour isn't allowed on HN?
37.
by jwbensley 9y ago
It's very common that someone hasn't heard of everything. It's why down votes without explanation are bad, like on StackOverflow. It was in reference to That Mitchell and Webb Look: https://youtu.be/AIxz6BDmTN
38.
by jwbensley 9y ago
Whats with the downvotes? That guys username is and my comment are both references to a TV show.
39.
by jwbensley 9y ago
Its not brain surgery!
40.
by jwbensley 9y ago
@brendangregg - superb work! Do you (or anyone else here) know if something like this exists already, or is in the pipeline, for raw sockets in Linux?
41.
by jwbensley 9y ago
Hello author, NetEng department here, good article, thanks! I'm sad to say this problem affects IPv4 too and its not that uncommon when using layer 3 switches. The TCAM allocation for IPv4/6 is usually a fraction of the size alloc
42.
by jwbensley 9y ago
If the author sees this message, thank you! Just the kind of tutorial I was looking for! I'd love to see one that built on this a little and showed a packet from kernel space in one device being sent over a PCIe NIC and then bring rece
43.
by jwbensley 9y ago
Are you referring to this? "GbE is 1250Mbps" 1.25Gbps is the "gross" bit rate for 1000BASE-T Ethernet. This is because it uses 8b/10b encoding on the wire (meaning there is a 25% overhead): https://en.wik
44.
by jwbensley 9y ago
You're not a NetEng until you've done this! I've done it more than once, so I must be great :)
45.
by jwbensley 9y ago
Is there no chance that Apple and/or the FBI have the list of phone serial numbers and matching AES key? (If that sounds sarcastic it's not meant to, genuine question as I don't know much a about this stuff!).
46.
by jwbensley 9y ago
Self modifying code is wandering into the (very interesting IMO) realms of metamorphic and polymorphic code. I started an SO questionable here: https://stackoverflow.com/questions/10113254/metamorphic-cod... I&#x2
47.
by jwbensley 9y ago
It does say quite near the start that Jon joined SO in 2008 and further on "In the near decade since then, Jon has answered over 34,000 questions, which works out to about 10 questions per day!" So I don't think he's jus
48.
by jwbensley 9y ago
A very easy assembly game to start with if you find assembly intimidating is Box256: http://box-256.com It has a very limited/basic instruction set do it's easy to get going and WebGL based so it runs in your browser.
49.
by jwbensley 9y ago
A good introduction but through my personal journey to learn about raw socket programming in Linux, I can't recommend just diving in and reading the kernel source code enough. I feared this as C is a hobby for me so I assumed it would
50.
by jwbensley 9y ago
"In this web based tutorial. First we give a brief overview about the impact of addressing on lookup operations. We then present a series of different address lookup algorithms along with their advantages and disadvantages. Finally, we
51.
Comparison of trie structures used for IP address lookups(raminaji.wordpress.com)
2 points by jwbensley 9y ago|1 comments