Category Archives: Networking

Issues and news relating to networking.

Over 3 Million Americans Now on IPv6

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In the U.S. the latest numbers for IPv6 are impressive. APNIC’s global survey as of August 1st has IPv6 penetration in the U.S at 1.35 percent. That translates into an estimated IPv6 user base of 3.3 million users, the largest base of IPv6 users in the world.

via Over 3 Million Americans Now on IPv6.

“There are Tier 1 ISPs out there that refuse to go and get either transit or peering with other ISPs,” Nygren said. “So there are places on the IPv6 Internet, in particular in parts of Europe, where there is no path between point A and B.”

Dropbox – What is LAN sync?

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Well, when you add a file to your computer’s Dropbox, the file is then synced with Dropbox servers. Dropbox will then initiate the syncing process as soon as it determines a change has been made to the file. All linked computers and shared folders will then download any new version of the file. With LAN syncing, Dropbox will look for the new file on your Local Area Network first, bypassing the need to download the file from Dropbox servers, thus speeding up the syncing process considerably.

via Dropbox – What is LAN sync? – Simplify your life.

I’m not quite sure if this is a good idea.

From: http://tools.cisco.com/security/center/viewAlert.x?alertId=23896

When synchronizing user data and communicating with the host service, a Dropbox client normally uses TCP port 443.  In addition, the application may also use UDP and TCP port 17500 for communication via the Dropbox LanSync Protocol.

And…

Administrators are advised to implement an intrusion prevention system (IPS) or intrusion detection system (IDS) to help detect and prevent attacks that could detect the presence of Dropbox in a network.

MiFi

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MiFi is a line of compact wireless routers produced by Novatel Wireless that act as mobile Wi-Fi hotspots. MiFi stands for ‘My Wi-Fi’. The MiFi can be connected to a mobile phone (cellular) carrier and provide internet access for up to 5 devices. The MiFi works at a distance up to 10 m (30 ft) and will provide internet or network access to any WiFi enabled peripheral device.

via MiFi – Wikipedia, the free encyclopedia.

Access Server Overview

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OpenVPN Access Server is a full featured SSL VPN software solution that integrates OpenVPN server capabilities, enterprise management capabilities, simplified OpenVPN Connect UI, and OpenVPN Client software packages that accommodate Windows, MAC, and Linux OS environments. OpenVPN Access Server supports a wide range of configurations, including secure and granular remote access to internal network and/ or private cloud network resources and applications with fine-grained access control.

via Access Server Overview.

IPID

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    The 16-bit IPID field carries a copy of the current value of a counter in a host’s IP stack. Many commercial operating systems (including various versions of Windows and Linux versions 2.2 and earlier) implement this counter as a global counter. That is, the host maintains a single IPID counter that is incremented (modulo 216 ) whenever a new IP packet is generated and sent. Other operating systems implement the IPID counter as a per-flow counter (as is done in the current version of Linux), as a random number, or as a constant, e.g., with a value of 0 ([1]).

From: ftp://gaia.cs.umass.edu/pub/Chen04_IPID.pdf

From: Fun with IP Identification Field Values

RFC 791 gives a description about the IP Identification field.

The identification field value is used to uniquely identify the fragments of
a particular datagram. Fragments of a particular datagram are assembled if
they have the same source, destination, protocol, and Identifier. The
identifier is being chosen to be unique for this “this source, destination
pair and protocol for the time the datagram (or any fragment of it) could be
alive in the internet”[1].

TIME dotCom, Facebook And Others Invest In Massive Undersea Internet Cable Project

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TIME is leading up the process, but Facebook as well as a few others are joining in by combining $450 million to the cause. APG is geographically well spread to bridge international capacity hubs such as Japan, Hong Kong, Singapore, Taiwan and Korea as well as connecting emerging markets such as Vietnam and China where demand for capacity is multiplying yearly.

via TIME dotCom, Facebook And Others Invest In Massive Undersea Internet Cable Project – HotHardware.

Intro to OpenFlow

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In a classical router or switch, the fast packet forwarding (data path) and the high level routing decisions (control path) occur on the same device. An OpenFlow Switch separates these two functions. The data path portion still resides on the switch, while high-level routing decisions are moved to a separate controller, typically a standard server. The OpenFlow Switch and Controller communicate via the OpenFlow protocol, which defines messages, such as packet-received, send-packet-out, modify-forwarding-table, and get-stats.

via Intro to OpenFlow.

OpenFlow allows you to easily deploy innovative routing and switching protocols in your network. It is used for applications such as virtual machine mobility, high-security networks and next generation ip based mobile networks.

Snort :: Home Page

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Snort :: Home Page.

Snort® is an open source network intrusion prevention and detection system (IDS/IPS) developed by Sourcefire. Combining the benefits of signature, protocol, and anomaly-based inspection, Snort is the most widely deployed IDS/IPS technology worldwide. With millions of downloads and nearly 400,000 registered users, Snort has become the de facto standard for IPS.

Network coding

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Network coding – Wikipedia, the free encyclopedia.

Network coding is a technique where, instead of simply relaying the packets of information they receive, the nodes of a network will take several packets and combine them together for transmission. This can be used to attain the maximum possible information flow in a network. Network coding is a field of information theory and coding theory.