How to disable IPv6 on CentOS / RHEL 7

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Disable IPv6 in kernel module (requires reboot) 1. Edit /etc/default/grub and add ipv6.disable=1 in line GRUB_CMDLINE_LINUX, e.g.: # cat /etc/default/grub GRUB_TIMEOUT=5 GRUB_DEFAULT=saved GRUB_DISABLE_SUBMENU=true GRUB_TERMINAL_OUTPUT=”console” GRUB_CMDLINE_LINUX=”ipv6.disable=1 crashkernel=auto rhgb quiet” GRUB_DISABLE_RECOVERY=”true” 2. Regenerate a GRUB configuration file and overwrite existing one: # grub2-mkconfig -o /boot/grub2/grub.cfg 3. Restart system and verify no line “inet6” in “ip addr show” … Read more

Get the multi-row tab bar back in Firefox

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github.com: MrOtherGuy/firefox-csshacks github.com: Aris-t2/CustomCSSforFx C:\Users\$user\AppData\Roaming\Comodo\IceDragon\Profiles\ $profile_name .default\chrome\userChrome.css C:\Users\$user\AppData\Roaming\Mozilla\Firefox\Profiles\$profile_name.default\chrome\ userChrome.css Sample userChrome.css for Firefox on Linux: sample userChrome.css for Firefox on Windows:

Cleaning up Network Connections in Windows 7 – Rename Local Area Network

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Windows makes a mess of all the network adapters when installing NIC cards. Sometimes, you remove network adapters, and you’re left with something like “Local Area Network 3” that can’t be renamed back to “Local Area Network”. The problem is, Windows remembers the previous adapter (even if it is physically removed), so you can’t rename … Read more

ipconfig tunneling adapter

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Both Teredo and ISATAP are mechanisms for IPv6 connectivity on IPv4-only networks. Since Windows 7 comes with IPv6 enabled, I wouldn’t be surprised if they were always on, just didn’t appear in ipconfig for some strange reason. (On one of my test VMs, the ISATAP adapter shows up, but not Teredo. Also strange.) ISATAP is … Read more

Ubuntu – Force fix errors on a mounted drive – fschk

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You cannot repair sda because it is mounted. # fsck -nf /dev/sda1 fsck from util-linux 2.27.1 e2fsck 1.42.13 (17-May-2015) Warning!  /dev/sda1 is mounted. Warning: skipping journal recovery because doing a read-only filesystem check. Pass 1: Checking inodes, blocks, and sizes Pass 2: Checking directory structure Pass 3: Checking directory connectivity Pass 4: Checking reference counts … Read more

Enable admin share windows 8

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Errors encountered : Unable to connect to the network share ‘xxxx\ADMIN$ Can’t access ADMIN$ share using a local user account To enable the hidden admin share in Windows 8, follow this procedure: Launch the Registry editor by typing regedit.exe in the Start Screen. Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System. Create a new entry by right-clicking System and then … Read more

Check ESXi logs via Web browser

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Open a browser and go to http://$ESXhost/host . You will then be prompted to login. Here is a review of the logs and their content http://kb.vmware.com/kb/2004201