" Linux "

How to convert a Multicast IP Address to the corresponding MAC Address. Converting Decimal to Binary and Hexadecimal.

Recently I was working to track down a multicast problem for a client on an enterprise network and needed to determine what the exact multicast MAC address would be. I knew that any mac address that started with 01-00-5E was a multicast address, but wasn’t sure how the rest of it was calculated. I’ll explain below exactly how to determine the multicast MAC address from the multicast IP as well as provide a few helpful websites. (more…)

Samsung Galaxy S3 SGH-T999 stock supported USSD codes

There may have been a time when you called in to get support on your phone and they had you type in some random numbers under your phone to set something up. These codes are called USSD and there are a number of them that developers use to troubleshoot problems and configure devices without having to contact the cell company for support. Below is a list of the known supported codes. (more…)

How to sync or copy files between servers and/or workstations using RSYNC under CentOS Linux

Here’s a few quick tips on how to sync files between servers or workstations using rsync. (more…)