Sunday, March 31, 2013

how to change your dm-crypt passphrase

  1. Assuming your encrypted partition is /dev/sda5 (crypttab would say sda5_crypt)
  2. add new key: cryptsetup luksAddKey /dev/sda5
  3. reboot and test
  4. remove old key: cryptsetup luksRemoveKey /dev/sda5

Reference


Friday, March 29, 2013

how to mount read/write ntfs in macosx

Well .. i was facing same problem and i've found a solution that works perfectly for me and i can write on NTFS:

1- Install OSXFUSE == > The most important part is to check the compatibility layer within installation otherwise it wont work
2- Install fuse_wait pkg
3- Install ntfs-3g 2010.10.2 and remove the MacFuse from the customized installation (if you couldn't, just after installation, go to preference and remove the MacFuse)
4- Reboot your macbook, et Voila .. it'll work

i've got this info from this link
https://github.com/osxfuse/osxfuse/wiki/NTFS-3G

Hope that would help

Cheers, Soha

how to migrate VirtualBox

  1. delete all snapshots
  2. file > virtual media manager
  3. edit VirtualBox.xml

Saturday, March 23, 2013

how to limit number of connections to our server per period of time with iptables

sample - allow 2 hits once every 3 seconds

iptables -A INPUT -p tcp --dport 80 -i eth0 -m state --state NEW -m recent --set
iptables -A INPUT -p tcp --dport 80 -i eth0 -m state --state NEW -m recent --update --seconds 3 --hitcount 2 -j DROP