Archive for June, 2013

How does traceroute work?

It uses the TTL (Time To Live) parameter and UDP to get the path. Each router which is passed needs to decrease the TTL value of a packet and if it is below 1 the router will discard it and send a ICMP (time exceeded) back to the source. So traceroute sends the first packet with a TTL of 1 to reach the first router and one more with a TTL of 2 to reach the second and so on. You get the picture. But how does it know when the destination is reached? Well it useses another trick for that.  Traceroute sends out a UDP Packet with it with a port higher than 3000. It is very unlikely that this port will be opened at the destination so it will get back from the destination a ICMP packet (port unreachable) which is the answer to the question.

Important: Remember that not all packets are going the same way and it’s likely that they use different paths.

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admin on June 27th 2013 in IT, Network

Scam Email: URGENT: “company name” Brand Registration Confirmation!

This is a scam mail where they tell you that somebody is trying to register your domain name with another topleveldomain. If  you answer to it you will probably bid against an imaginary company which doesn’t exist and get an expensive domain name or even just loose the money.  Of course if you ask who wants to buy it they won’t tell you because of privacy issues.

Email Content:

(Please forward to the President or Brand Owner, thank you)

Dear Sir/Madam,
We are a registration agency of Asian Domain Registration Organization in China. I have something to confirm with you. We formally received an application on June 17, 2013 that a company which self-styled "Abtry International Co.,Ltd" were applying to register "company name" as their Brand Name and some domain names through our firm.

Now we are handling this registration, and after our initial checking, we found these names were similar to your company’s, so we need to check with you whether your company has authorized that company to register these names. If you authorized this, we will finish the registration at once. If you did not authorize, please let us know within 7 workdays, so that we will handle this issue better. Out of the time limit we will unconditionally finish the registration for "Abtry International Co.,Ltd". Looking forward to your prompt reply.

Best Regards

Hannah Lin

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admin on June 19th 2013 in Email, IT

Migrate Printers from Windows 2008 to 2012 with Powershell

It is possible to export all printers from Windows 2008 Server and import them again into Windows 2012. I tried this method but got just error messages and I didn’t like the fact, that it imports also the old drivers. So I installed first the necessary printer drivers on the new server and run the script below to create all the printers. It automatically adds the necessary ports and the printers. If you want to add more parameters it is easily possible.

Create CSV file with the printers (printers.csv):
Name, IP, Driver, Location
"PRINTER01", "192.168.1.10", "Xerox Global Print Driver PCL6", "Main Building, First Floor"
"PRINTER02", "192.168.1.11", "Xerox Global Print Driver PCL6", "Main Building, Second Floor"

Script to import the printers (printers.ps1):
$printers = Import-Csv c:\temp\powershell\printers.csv
 
foreach ($printer in $printers) {
    Add-PrinterPort -Name $printer.Name -PrinterHostAddress $printer.IP
    Add-Printer -Name $printer.Name -DriverName $printer.Driver -PortName $printer.Name -Comment $printer.Comment -ShareName $printer.Name
    Set-printer -Name $printer.Name -Shared $true -Published $true
}

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admin on June 6th 2013 in IT, Windows Server

Install SNMP with Powershell on Windows 2012

If you run the command without the management tools then you won’t have the tabs to configure the snmp-service. By the way the argument –Whatif shows you in advance what would be installed if you run the command. So to actually installe it run the command without –WhatIf.

#Add-WindowsFeature -Name SNMP-Service -IncludeAllSubFeature -IncludeManagementTools –Restart –WhatIf

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admin on June 4th 2013 in IT, PowerShell, Windows Server




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