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

• https://makandracards.com/makandra/661-how-to-change-your-dm-crypt-passphrase

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

 https://discussions.apple.com/thread/4152122?start=0&tstart=0

how to migrate VirtualBox

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

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