--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/net.rst	Sun Dec 04 20:02:54 2011 +0200
@@ -0,0 +1,149 @@
+.. -*- coding: utf-8; -*-
+
+==========
+ Network.
+==========
+
+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
+
+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``.
+
+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
+