Linux 4.11 kernel extends packet sampling support
Introduce psample, a general way for kernel modules to sample packets, without being tied to any specific subsystem. This netlink channel can be used by tc, iptables, etc. and allow to standardize packet sampling in the kernel commitThe psample netlink channel delivers sampled packet headers along with associated metadata from the Linux kernel to user space. The psample fields map directly into sFlow Version 5 sampled_header export structures:
| netlink psample | sFlow | Description |
|---|---|---|
| PSAMPLE_ATTR_IIFINDEX | input | Interface packet was received on. |
| PSAMPLE_ATTR_OIFINDEX | output | Interface packet was sent on. |
| PSAMPLE_ATTR_SAMPLE_GROUP | data source | The location within network device that generated packet sample. |
| PSAMPLE_ATTR_GROUP_SEQ | drops | Number of times that the sFlow agent detected that a packet marked to be sampled was dropped due to lack of resources. Agent calculates drops by tracking discontinuities in PSAMPLE_ATTR_GROUP_SEQ |
| PSAMPLE_ATTR_SAMPLE_RATE | sampling_rate | The Sampling Rate specifies the ratio of packets observed at the Data Source to the samples generated. For example a sampling rate of 100 specifies that, on Continue reading |
Rough Guide to IETF 99: IPv6
In this post for the Internet Society Rough Guide to IETF 99, I’m reviewing what’ll be happening at IETF 99 in Prague next week.
Mr. Kevin Meynell
BGP Configurations on HP Routers
Today I am going to talk about the BGP configurations on the HP routers. I already posted the articles on the BGP configurations earlier where i defined the basic configurations on the Cisco and Juniper routers. Apart from these configurations I already put the basic information of the BGP as well. Below are some of the articles for which you can refer to study yourself step by step.
BGP Basics
BGP basics on Juniper Routers
BGP configurations on Cisco routers
Today I am going to have the basic configurations on HP routers with the topology. Below is the basic topology and the basic BGP configuration as below. The Topology and the IP addresses used here are only for the demo purposes and has no relevance with any of the live or enterprise networks.
Below is the demo topology showing the use of the HP routers where BGP is configured in the MPLS environment. This is just a example to showcase the topology. I will come up with the configurations on HP routers in the MPLS environment in later stage. As of now first we need to talk about the basic BGP on the HP routers and step by step we Continue reading
BGP Basics
BGP basics on Juniper Routers
BGP configurations on Cisco routers
Today I am going to have the basic configurations on HP routers with the topology. Below is the basic topology and the basic BGP configuration as below. The Topology and the IP addresses used here are only for the demo purposes and has no relevance with any of the live or enterprise networks.
Below is the demo topology showing the use of the HP routers where BGP is configured in the MPLS environment. This is just a example to showcase the topology. I will come up with the configurations on HP routers in the MPLS environment in later stage. As of now first we need to talk about the basic BGP on the HP routers and step by step we Continue reading
OpenStack Neutron Components and Concepts
Learn about the cloud networking service in this excerpt from Packt's "OpenStack: Building a Cloud Environment."
(Not-so-very) Early Network Automation
If you’re not old enough to know otherwise, you’d think (based on recent hype) that we discovered network automation a few years ago. Not true. One of my readers sent me a link to excellent Managing IP Networks with Free Software presentation from NANOG26 (October 2002).
I found the presentation awesome, nothing new, and extremely sad… all at the same time.
Read more ...TCPDump Quick Reference
TCPDump quick reference guide.TCPDump Quick Reference
TCPDump is a tool for sniffing packets on a network. This is not a comprehensive tutorial, only a quick reference source. Consult the man pages and/or documentation for indepth explanation of commands. Capturing Traffic All Traffic for an interface -i <interface-name> specifies an...Another Service Provider Picks VeloCloud for SD-WAN
The company will initially market the service to its existing customers.
Latest Fedora Project OS Tips its Hat to Container Upgrades
The containerized Kubernetes option supports running of different orchestration versions.
SK Telecom Creates its Own In-House NFV MANO
The operator got fed up with separate NFV management for different equipment.
Getting started with Cloudflare Apps
We recently launched our new Cloudflare Apps platform, and love to see the community it is building. In an effort to help people who run web services such as websites, APIs and more, we would like to help make your web services faster, safer and more reliable using our new Apps Platform by leveraging our 115 points of presence around the world. (Skip ahead to the fun part if you already know how Cloudflare Apps works)
How Cloudflare apps work
Here is a quick diagram of how Cloudflare apps work:
The “Origin” is the server that is providing your services, such as your website or API. The “Edge” represents a point of presence that is closest to your visitors. Cloudflare uses a routing method known as Anycast to ensure the end user, pictured on the far right, is routed through the best network path to our points of presence closest to them around the world.
Historically, to make changes or additions to your site at the edge changes to a site, you needed to be a Cloudflare employee. Now with apps, anyone can quickly make changes to the pages rendered to their users via Javascript and CSS. Today, you Continue reading
Edgewise Brings Zero-Trust Security to the Data Center and Cloud
Investors include Carbon Black and Threat Stack CEOs.