Linux

Disable IPv6 on Ubuntu 11.10

This is a short HOWTO on disabling IP version 6 support on your ethernet devices like eth0 on Ubuntu 11.10. I guess you can do this on earlier version of Ubuntu as well. Add the following line to the end of the file /etc/sysctl.conf (as root or use sudo) net.ipv6.conf.all.disable_ipv6 = 1 Run the following […]

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Network

NetBackup 7.x port usage

If you are unsure what ports Symantec NetBackup 7.x master or media Windows server uses, just open the following file %SYSTEMROOT%\system32\drivers\etc\services The content in this file could be like this if you have not made any changes to the default configuration bpcd 13782/tcp bprd 13720/tcp vnetd 13724/tcp vopied 13783/tcp bpdbm 13721/tcp bpjobd 13723/tcp bpjava-msvc 13722/tcp […]

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Network

Change ethernet settings using ethtool

Force network speed on a network card to 100 MBit Full Duplex and in the same time disable auto negotiation # ethtool -s eth0 speed 100 duplex full autoneg off These settings are active until you reboot the machine or restart the network. In order to keep this change on each system reboot, append the […]

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Linux

iptables connection tracking table full

I’ve recently experienced that my workstation (Ubuntu Jaunty Jackalope, 9.04, x86_64) “hangs” periodically when my internet browser, Mozilla Firefox, has a lot of active tabs. In my case I had > 100 active tabs in more than 20 windows. I know I should have closed some of them but that is not an option right […]

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