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Written by Oleksandr Gavenko (AKA gavenkoa), compiled on 2017-01-30 from rev ccaa2f364422+.

Network.

Network managers.

Mainstream in Debian:

connman
Intel Connection Manager daemon.
network-manager
Network management framework (daemon and userspace tools).
wicd
Wired and wireless network manager.

Misc:

netctl
Come under systemd umbrella, absent in Debian.
WiFi Radar
Python scripts that lanches another applications.

Ukraine internet provider.

Utel.

User - none, password - none, phone - *99***1# or *99#.

Peoplenet.

User and password you get by sending SMS message to 920 number. Phone #777.

DNS to IP address.

$ nslookup example.com

IP to DNS address.

$ nslookup 192.168.1.1

NetBIOS to IP address.

By nbtstat.exe command from MS you can print NetBIOS name cache with name-to-IP address mappings:

$ nbtstat -c
$ nbtstat -a NETBIOSNAME

IP to NetBIOS address.

$ nbtstat -A xxx.xxx.xxx.xxx

List of NetBIOS name.

$ nbtstat -r

List of open ports.

List of open ports under Windows.

cmd> netstat        # with DNS name resolution, TCP only
cmd> netstat -n     # without name resolution, TCP only
cmd> netstat -a -n  # TCP and UDP
cmd> netstat -s     # show IP, ICMP, TCP, and UDP statistics.

List of open ports under Linux.

-t tcp, -u udp, -l local, -p process:

$ sudo netstat -tulp

or to use port number instead of protocol name:

$ sudo netstat -tulpn

Which processes open port?

Windows

cmd> netstat -o     # show PID
cmd> netstat -b     # show also cmd name
cmd> netstat -b -v  # show all modules (.exe and .dll) with full path

Linux.

$ sudo netstat -tulpn

or:

$ sudo lsof -i

How disable IPv6?

Debian kernel 2.6/Ubuntu ("official" method)/Fedora Core.

Comment in /etc/modprobe.d/aliases "alias net-pf-10 ipv6" and add alias "net-pf-10 off", "alias ipv6 off":

$ sudo emacs /etc/modprobe.d/aliases
...
$ cat /etc/modprobe.d/aliases
...
# alias net-pf-10 ipv6
alias net-pf-10 off
alias ipv6 off
...

Reboot or:

$ sudo update-modules

Another way is adding to /etc/modprobe.d/blacklist.local lines:

blacklist ipv6

You can safely wipe out any IPv6 reference in /etc/hosts and /etc/network/interfaces.

http://wiki.debian.org/DebianIPv6
DebianIPv6

RHEL4/Centos4.

As for Debian, but /etc/modprobe.d/aliases has name /etc/modprobe.conf.

KDE.

$ cat /etc/environment
...
KDE_NO_IPV6=true
...

Firefox.

See about:config page, set network.dns.disableIPv6 to true.

Clear saved Windows networking passwords.

cmd> rundll32.exe keymgr.dll, KRShowKeyMgr
cmd> control userpasswords2                 # another way

Proxy auto-config.

http://en.wikipedia.org/wiki/Proxy_auto-config