Admins eHow SysAdmin Tips & Tricks

May 12, 2014

SPF Policy Tester & Syntax Validator

Filed under: dns — Tags: , , , , — admin @ 1:54 pm

This website is super useful for verifying and testing SPF records :

SPF Syntax Validator : http://vamsoft.com/support/tools/spf-syntax-validator
SPF Policy Tester : http://vamsoft.com/support/tools/spf-policy-tester

April 10, 2010

Benchmark network throughput between 2 systems

Filed under: General,Windows — Tags: , , , , , , — admin @ 2:22 pm

Today I had 2 systems connected to each other with Mellanox MT25208 InfiniBand cards with 40Gbps speed ( it is fast , isnt it ? 😀 ) , after setting up IPoIB ( IP on InfiniBand ) on cards. I wanted to make sure I really have 40Gbps speed , so I searched the net for a network throughput benchmark utility and I found a great software named PCAUSA Test TCP (PCATTCP)
You can download its latest version from its original site : Original Download Page
Or from my site : PCATTCP-0111.zip
Usage :
you have to run a receiver on one of systems by following command :

PCATTCP.exe -r

the default setting was not optimized for testing a 40Gbps line , so I used the following command on transmitter part :

PCATTCP.exe -t -l 819200 -n 1024 10.0.0.1

10.0.0.1 is the IP of receiver part.
You are curious to know the result ? 😀 Here it is :

PCAUSA Test TCP Utility V2.01.01.11
Started TCP Transmit Test 0...
TCP Transmit Test
  Transmit    : TCP -> 10.0.0.1:5001
  Buffer Size : 819200; Alignment: 16384/0
  TCP_NODELAY : DISABLED (0)
  Connect     : Connected to 10.0.0.1:5001
  Send Mode   : Send Pattern; Number of Buffers: 1024
  Statistics  : TCP -> 10.0.0.1:5001
838860800 bytes in 1.97 real seconds = 416683.62 KB/sec +++
numCalls: 1024; msec/call: 1.97; calls/sec: 520.85

Yes , I have a working 40Gbps line 😀

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