Category Archives: Linux

Creating Serial Console Access in VMware ESXi v5.5

Creating Serial Console Access in VMware ESXi v5.5 1. Power off the VM. 2. Right-click the VM and configure the virtual serial port settings. 2.1 Choose Edit Settings > Add. 2.2 Choose Device Type > Serial port, and Next. 2.3 … Continue reading

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Protocol Overhead

Protocol Overhead How fast can you really go using a given media and protocol stack? We examine how much bandwidth is left for applications. Ethernet Ethernet frame format: 6 byte dest addr 6 byte src addr [4 byte optional 802.1q … Continue reading

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Wireshark v1.6.7 supports SNMP v3 Traps decode

Wireshark v1.6.7 supports SNMP v3 Traps decode 1.  WireShark -> Edit -> Preferences -> Protocols -> SNMP 2. Add SNMPv3 username, passwords 3. It supports MD5 and DES decodes only, anything else crashes Wireshark.

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Diable IPv6 in Ubuntu 12.10

Put the follow lines into /etc/sysctl.conf and execute ‘sudo sysctl -p’. net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1 net.ipv6.conf.lo.disable_ipv6 = 1  

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How To Remove Unused Old Kernels On Ubuntu/Debian

The original post can be found here http://www.upubuntu.com/2011/11/how-to-remove-unused-old-kernels-on.html I’d like to keep a copy here for personal record. If you update your current Ubuntu or Debian kernel, then the old kernel image will remain installed on your hard drive, despite it … Continue reading

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Writeable TFTP Server

Submitted by edwin on Wed, 12/08/2010 – 09:41 Ubuntu Ubuntu 10.04 LTS TFTP is used for example to back-up and restore network device configurations or firmware. These steps are required to set up a writeable tftp server on Ubuntu server 10.04 1. sudo apt-get install tftpd-hpa 2. … Continue reading

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