What does “Blocked” really mean in the Firefox developer tools Network monitoring?

We changed the Firefox setting (about:config) ‘network.http.max-persistent-connections-per-server’ to 64 and the blocks went away. We changed it back to 6. We changed our design/development method to a more ‘asynchronous’ loading method so as not to have a large number simultaneous connections. The blocks were mostly loading a lot of png flags for locale settings.

Check incoming network traffic in real time?

Ifstat: rilindo@ubuntu:~$ sudo apt-get install ifstat [sudo] password for rilindo: Reading package lists… Done Building dependency tree Reading state information… Done The following NEW packages will be installed: ifstat 0 upgraded, 1 newly installed, 0 to remove and 3 not upgraded. Need to get 23.4kB of archives. After this operation, 94.2kB of additional disk space … Read more

Key differences between Nagios and Open NMS?

Wikipedia has a comparative table which helps a lot I think the key differences are: language: Nagios is written in C and OpenNMS in Java. It makes nagios a lot faster on older hardware. Data collection: Nagios performs very little data collection. Other software (like cacti for example) will be required for a more extensive … Read more

How do I deal with the removal/eradication of an unknown worm on our network?

These are my general suggestions for this kind of process. I appreciate you’ll have covered some of them already but its better to be told something twice than miss something important. These notes are orientated towards malware that’s spreading on a LAN but could easily be scaled back to deal with more minor infections. Stopping … Read more

How to monitor network calls made from iOS Simulator

Personally, I use Charles for that kind of stuff. When enabled, it will monitor every network request, displaying extended request details, including support for SSL and various request/reponse format, like JSON, etc… You can also configure it to sniff only requests to specific servers, not the whole traffic. It’s commercial software, but there is a … Read more

Free open source alternative to pingdom? [closed]

I’m not familiar with Pingdom, but I think Smokeping will do everything you want. If you specifically want to monitor an HTTP/HTTPS server and not just general connectivity (by way of ICMP), check out the EchoPingHttp and EchoPingHttps probes. There are also probes that will monitor DNS and SSH services. We use smokeping for general … Read more

Solution to route/proxy SNMP Traps (or Netflow, generic UDP, etc) for network monitoring?

A co-worker just showed me samplicator. This tool looks to be just about a perfect solution what I was looking for. From the tool’s website: This simple program listens for UDP datagrams on a network port, and sends copies of these datagrams on to a set of destinations. Optionally, it can perform sampling, i.e. rather … Read more

Is there a way to get wireshark to capture packets sent from/to localhost on Windows?

There’s a WIKI Entry about exactly this issue on the wireshark homepage. They also mention specifics about the loopback interface regarding Windows – you could be running just into that. You can’t capture on the local loopback address 127.0.0.1 with a Windows packet capture driver like WinPcap.

View installed programs on remote machine?

You can use one of the Sysinternals tools PSinfo: http://technet.microsoft.com/en-us/sysinternals/bb897550 PsInfo v1.77 – Local and remote system information viewer Copyright (C) 2001-2009 Mark Russinovich Sysinternals – www.sysinternals.com PsInfo returns information about a local or remote Windows NT/2000/XP system. Usage: psinfo [-h] [-s] [-d] [-c [-t delimiter]] [filter] [\computer[,computer[,..]]|@file [-u Username [-p Password]]] -u Specifies optional … Read more