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SIGTERM vs. SIGKILL
Sending signals to processes using kill on a Unix system is not a new topic for most systems administrators, but I’ve been asked many times about the difference between kill and kill -9. Read more…
Moving your applications into “the cloud” means that round-trip times and protocol and application latency can become a serious issue.
The Riverbed Virtual Steelhead Appliance, a software version of Riverbed Technology’s WDS solution is worth considering:
Read more…
Bob Gilbert discusses how Riverbed Technology RSP provides “one-box” solution for local delivery of virtualized industry-standard applications, speeding up your network:
When multiple WAEs exist in a service group, WCCPv2 automatically distributes redirected traffic across all WAEs in the service group. When traffic passes through an IOS device with WCCPv2 redirection configured, the IOS device assigns traffic for that connection to a bucket. Read more…
The routers and WAEs participating in the same service constitute a service group. A service group defines a set of characteristics about what types of traffic should be intercepted, as well as how the intercepted traffic should be handled. There are two types of service groups:
Well-known services, also referred to as static services, have a fixed set of characteristics that are known by both IOS and WCCPv2 client devices. Read more…
ngrep is a “network grep” utility that can be used to match regular expressions within network packet payloads. This is a very handy utility as many network analysers (”packet sniffers”) can examine the packet header, but either do not display or cannot filter based on packet payload. Read more…
Active FTP:
In active mode FTP the client connects from a random unprivileged port (N > 1023) to the FTP server’s command port, port 21. Then, the client starts listening to port N+1 and sends the FTP command PORT N+1 to the FTP server. The server will then connect back to the client’s specified data port from its local data port, which is port 20.
From the server-side firewall’s standpoint, to support active mode FTP the following communication channels need to be opened: Read more…
Introduction
Riverbed Steelhead as WAN accelerator is deployed in WAN environment when traffic between WAN network (i.e. MPLS, Frame Relay) need to be optimized, hence creating so-called “WAN acceleration”. With “standard” WAN network consists of WAN routers and LAN switches, typically the Riverbed Steelhead is in place inline between the WAN routers and LAN switches. The f9llowing is an illustration: Read more…
Here is a list of NetFlow reporting software: Read more…
Copy this text into a file with a “.reg” extension, then double click to update registry (caution: backup registry beforehand)
[HKEY_CLASSES_ROOT\telnet\shell\open\command]
@=”putty.exe %1″