Prefer IPv4 on Ubuntu 16.04 LTS xenial – /etc/gai.conf

New Ubuntu 16.04 LTS Xenial prefers IPv6 connections. In some networks, this breaks software updates. You can easily fix this by making Ubuntu prefer IPv4 connections over IPv6.

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Security Researcher Ali Dehghantanha visits Haaga-Helia – w14 Wednesday 09:00

Doctor Ali Dehghantanha will visit HH from Salford University. He’ll give a presentation on computer security. Haaga-Helia auditorium, w14 Tuesday Wednesday 2016-04-05 09:00 … 12:00 The event is open for Haaga-Helia students and staff. UPDATE: Day changed to WEDNESDAY. Time … Continue reading

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Forensic File Recovery with Linux – Undelete

Want your deleted files back? Plan A: have backups. Plan B: take a disk image and use a tool to undelete your files. If you are doing forensic analysis, file recovery is your only option. Prequisites: fluency with the command … Continue reading

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Cyber Security Day in Haaga-Helia

Protect your systems against cyber crime. Preliminary agenda and description in Finnish. The event is completely in English. Free registration, open to all. Auditorium in Haaga-Helia Pasila, Helsinki. w39 Tue 2013-09-24 at 13:00.

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PGP – Sähköpostin salakirjoitus

< ![CDATA[showTocToggle("+","-")]]>Table of Contents PGP – Sähköpostin salakirjoitus Asenna Linuxissa Windowsissa Luo avainpari (kaikissa käyttöjärjestelmissä) PGP – Sähköpostin salakirjoitus Kun salakirjoitat sähköpostisi, ulkopuoliset eivät pääse urkkimaan tietojasi. PGP on suosituin tapa salata sähköpostia, eikä suotta. Se on ilmainen ja toimii … Continue reading

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Ssh public key authentication

Ssh public key authentication How to set up public key authorization with linux distributions using openssh, such as Fedora, Red Hat or Debian. In this howto, you are on your own computer (whose name is local) as user erkki. You … Continue reading

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NAT iptables – share internet connection and ip-number

NAT iptables – share internet connection and ip-number Network Address Translation (NAT) means that one computer shares single internet connection and single ip to many computers. Internet connection is a critical part of network, so stability and security make Linux … Continue reading

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Ssh-uploadkeys – Automate SSH Login with Public Key Authentication

< ![CDATA[showTocToggle("+","-")]]>Table of Contents Ssh-uploadkeys – Automate SSH Login with Public Key Authentication Usage How does it work? Install See also Ssh-uploadkeys – Automate SSH Login with Public Key Authentication Automate login to an ssh account. This is necessary if … Continue reading

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Skype in a Sandbox

< ![CDATA[showTocToggle("+","-")]]>Table of Contents Skype in a Sandbox Get Skype Run Apparmor, run Skype Run Skype with Restrictions Readymade Profile Limiting Network Access Where are Open Source Encrypting Phones? Skype in a Sandbox Skype is a closed source VoIP phone … Continue reading

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Firewall for Single Host with Iptables

< ![CDATA[showTocToggle("+","-")]]>Table of Contents Firewall for Single Host with Iptables Why This Firewall Links Adminstrivia Firewall for Single Host with Iptables Firewall protects computers conneted to the internet by filtering incoming traffic. Every workstation and server should have a firewall, … Continue reading

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mount_sshfs

< ![CDATA[showTocToggle("+","-")]]>Table of Contents Mount Remote SSH Filesystem with FUSE Requirements Install SSHFS Load FUSE kernel module Mount SSH Filesystem Create mountpoint Mount Remote Filesystem Notes Troubleshooting Couldn’t find package sshfs fuse: failed to exec fusermount: Permission denied Fuse device … Continue reading

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Firewall for Single Host with Iptables

Moved: LATEST VERSION OF THIS FIREWALL IS NOW http://www.iki.fi/karvinen/iptables_firewall.html Firewall for Single Host with Iptables Firewall protects computers conneted to the internet by filtering incoming traffic. Every workstation and server should have a firewall, even if company has a firewall … Continue reading

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