IPv4 CIDR Subnet Mask Notation The CIDR number comes from the number of 1’s in the subnet mask when converted to binary. The common subnet mask 255.255.255.0 is 11111111.11111111.11111111.00000000 in binary. This adds up to 24 1’s, or /24 (pronounced […]
Private IPv6 address range If you have multiple locations/sites/networks, you should assign each one a different “Subnet ID”, but use the same “Global” ID for all of them. The IPv6 address space is so huge (2128) that everyone should be […]
IPv6: Goodbye to broadcast, say hello to Multicast » IPv6 while broadcast sends the traffic to all computers in the network – multicast follows a “subscribe to service” model. broadcast -> a computer using ARP sends a packet to FF:FF:FF:FF:FF:FF […]
the DNS system is basically the yellow pages – the phone book of the internet or any network. starting of as a single file (/etc/hosts) – to a world wide self-synchronizing system – that has grown over decades – meaning […]
routing is all about – TCP/IP and the route traffic/packages must/need/can take to the target (webserver, mailserver, youtube.com) and back. alias = “virtual network card” = you can have multiple ip-addresses per phyisical network card. under linux the naming is: […]
ip is the new ifconfig # show all network interfaces (physical and virtual) and their properties ip address show # or in short: ip a s 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback […]
you can check your machine’s current ip with: ip addr show to modify your network interface address setting simply use the nmtui tool: this failed me once with “no Update2” method… so let’s move on to the… manual way: terminal […]
“IPv4 was implemented in 1981, the Internet has grown dramatically, and there are no more available IPv4 addresses – Get Your Network Ready for IPv6 – The last block of IPv4 addresses have been allocated, and it’s time to get […]
EDIMAX EW-7612UAn V2 THE ONLY (?) GNU Linux WIFI WLAN Adapter that works OUT OF THE BOX on all GNU Linux systems (ODROID RASPBERRY AND Desktop GNU Linux) WPA2: (presharedkey = PSK) a lot of guides out there are incomplete. […]
Hardware Assembly: (i think 512MByte should be enough, 1GByte probably pretty good) Software Installation: including squid-proxy and web advertisement-filtering in the next part: OpenVPN 🙂 Thanks man! Amazing tutorials! by https://internetz.me Related Links: https://www.howtoforge.com/pfsense-squid-squidguard-traffic-shaping-tutorial http://www.shallalist.de/Downloads/shallalist.tar.gz
ip address add 192.168.100.200/24 dev eth0 will add ip 192.168.100.200 to your eth0 / LAN, in case you need to access more subnets than the default DHCP-subnet. please also checkout this amazingly cool youtube video tutorial on how to build […]
FOR SECURITY REASONS, KEEP ROUTER FIRMWARE UPDATED! Freifunk updates its router firmware and closes a critical security vulnerability that could allow attackers to install their own firmware on the devices. (src: heise.de) welcher router/welche hardware verwenden/zukunftstauglich? (ändert sich von Jahr […]
http://mirror.switch.ch/ftp/mirror/zeroshell/ZeroShell-3.6.0.iso -> fire this up in a VirtualBox machine… using “Generic Linux” settings. explanation later. as seen on: http://www.pcwelt.de/ratgeber/DSL-Optimierung_-_So_tunen_Sie_Ihr_Netzwerk-Multi-WAN_und_Co.-8913906.html Firewall Router Zeroshell is a Linux distribution for servers and embedded devices aimed at providing the main network services a LAN […]
IPv6 is great for everything that is (more or less) DIRECTLY connected to the internet (needs a public accessible address): firewalls / routers modems servers (using firewalls / routers and modems to connect) but it seems completely “overkill” and even […]
ifconfig shall be replaced by “ip” but many users are very used to ifconfig 🙂 is not anymore installed per default, and needs to be installed manually. the problem: ifconfig might not be sufficient anymore, because it might for example, not […]
A simple example, assuming your primary network interface is eth0 and has an ip of 192.168.1.1 and the new ip is 192.168.1.2: auto eth0 iface eth0 inet static address 192.168.1.1 netmask 255.255.255.0 gateway 192.168.1.254 auto eth0:0 iface eth0:0 inet static […]
tested on: Linux Debian 3.16.0-4-686-pae #1 SMP Debian 3.16.7-ckt25-2+deb8u3 (2016-07-02) i686 GNU/Linux #install software #centos7 yum update && yum install samba-client samba-common cifs-utils #debian apt-get update && apt-get install cifs-utils mkdir /mnt/cifs; # create mountpoint mount -t cifs //FILE-SERVER-IP-ADDRESS/NAME_OF_SHARE /mnt/cifs […]
what service/program is using what port: # list all open ports and listening services/programs lsof -i -P -n; web gui based -> https://dwaves.de/2018/04/04/monitoring-your-network/ watch traffic on terminal -> https://dwaves.de/2017/06/20/linux-bash-terminal-monitor-watch-network-traffic-in-real-time/ resource monitoring -> https://dwaves.de/2017/07/17/debian9-stretch-basic-web-based-ressource-monitoring-with-basic collectd/ nmap returns a nice overview… but […]
Creditz: Linode orginal article: https://www.linode.com/docs/tools-reference/tools/limiting-access-with-sftp-jails-on-debian-and-ubuntu Did you know SFTP has NOTHING to do with FTP 🙂 You do not need a complicated ssl-ftp-server-setup to provide encrypted up and downloads… no you only need an ssh-server, that you probably have installed […]
setting dynamic and fixed ips from bash-terminal – when given care to detail – is working just fine. there are also more or less working network-manager guis. mixing both is not recommended any network-manager gui software should respect the manual […]
rsync is a neat utility that lets you transfer whole directories ssh-encrypted over the internet. So it is perfect for online-backup purposes off servers etc. pp. It even can do partial-transfer which means: if 1 bit changed in a 1TB […]