24 articles tagged Networking.
A few months ago I switched from using Cisco’s QuickVPN software to the ShrewSoft VPN Client for Windows. I’m not going to get into the issues that I had with QuickVPN-it wasn’t very reliable. I’ve had ShrewSoft VPN for Windows v2.1.7 connecting to a Cisco RV082 VPN router. ShrewSoft provides…
Read article: ShrewSoft VPN Client Has Problem After Windows 7 Laptop Sleeps with VPN ActiveIn a previous blog post, I listed a number of SOA Specs and Security Specs that I thought were important to be familiar with when working with DataPower and other SOA technologies. In this post, I made a quick (and dirty) Visio diagram that I tend to draw up on a whiteboard when I’m at a new client…
Read article: SOA Specs VisualizedIt is often the case that a DataPower developer will have work to do, but does not yet have a backend Service Provider to point the DataPower service at. In general, anything beyond trivial examples will need to point at something that returns a valid response. In order to satisfy this requirement,…
Read article: SOAP Web Service Mockup tutorial on DataPowerThe definition of the word ownership has varying meanings across organizations, but there is always a group that retains control of the technology. It’s typically the group that sponsored the adoption of the technology and owns day-to-day support of it. But, sometimes, the technology initiative…
Read article: Who Owns DataPower Within An Organization?DataPower has a serial port console that is used during initial bootstrap of the appliance, recovering from problems, and certain configuration changes. Having access to the serial console is the only feasible approach to resolving certain issues that arise with any appliance (or piece of network…
Read article: DataPower and Terminal Servers…I’ve been playing with Cisco switches and routers recently at home to get a handle on VLANs-more about VLANs later. Some people I know who have gotten involved in DataPower started out in system administration or networking and worked their way up the technology stack to SOA Appliances (WebSphere…
Read article: OSI 7-Layer Network ModelI suppose I’m switching gears a bit here back towards something almost philosophical rather than my usual concrete technical info So be it. In the last six months, I’ve been at several clients sites that are using SOA appliances to build XML Gateway and ESB patterns. I answer quite a few client…
Read article: What is an Appliance? What is a SOA Appliance?What is a URL? What is a context root? It’s helpful to understand these things when writing or working with web applications.
Read article: HTTP(S) URLs & Context RootsHave you ever run snoop on Solaris or tcpdump on Linux or AIX and discovered that these tools cannot capture IP-based communication that occurs between two processes on the same machine? Or, Wireshark (formerly, Ethereal) on Windows? Only to discover the same limitation?
Read article: Capturing Network Communication Between Two Processes On the Same Machine…Any time you have a distributed application, there is network communication involved. Capturing this network traffic can be instrumental in diagnosing and solving problems. Generally, to capturing network traffic, superuser privledges, timing, and a bit of luck is needed. Often, the appropriate…
Read article: Capturing JVM TCP Traffic
