Arp cache aging time

Cisco routers
    4 hours
Cisco switches
    5 min
Windows Server 2003 and before
    2 min ( 10 min, if the address is reused )
Windows Vista and after
    Between 15 sec and 45 sec (random)
Linux box
    Various aging time

Switches are able to learn destination MAC addresses from client stations' arp request/query (because switches have longer aging time than client hosts). Those time differences keep them from flooding.

Refferences for Windows box
View the Address Resolution Protocol (ARP) cache
http://technet.microsoft.com/en-us/library/cc786759%28v=WS.10%29.aspx

Description of Address Resolution Protocol (ARP) caching behavior in Windows Vista TCP/IP implementations
http://support.microsoft.com/kb/949589

Change of .vimrc

Change log:
1) Added tab settings for html
2) Enabled filetype plugins
3) Enabled matchit

  1 "
  2 " This file (.vimrc) is modified on 2012/3/19
  3 "
  4
  5 " General
  6 set number " to display lines
  7 set title " display filename on the title bar
  8 set ignorecase " search not casesensitively
  9 set showmatch " hilight a pair of parenthesis and braces
 10 set matchtime=2 " limit the showmatch's hilight time, ms
 11 set wildmenu " compliment vim's commandline instructions
 12 set tabstop=4
 13 set shiftwidth=4
 14 set softtabstop=4
 15 set autoindent " Enable autoindent
 16 set ruler  " Ruler on
 17 set incsearch
 18 set hlsearch
 19 set backup
 20 set backupdir=~/.tmp_vim
 21 set dir=~/.tmp_vim
 22
 23 " Plugins
 24 filetype on           " Enable filetype detection
 25 filetype indent on    " Enable filetype-specific indenting
 26 filetype plugin on    " Enable filetype-specific plugins
 27 runtime macros/matchit.vim
 28
 29 " Ruby
 30 autocmd FileType ruby,eruby compiler ruby
 31 autocmd FileType ruby,eruby set tabstop=2
 32 autocmd FileType ruby,eruby set shiftwidth=2
 33 autocmd FileType ruby,eruby set softtabstop=2
 34 autocmd FileType ruby,eruby set expandtab
 35
 36 " HTML
 37 autocmd FileType html set tabstop=2
 38 autocmd FileType html set shiftwidth=2
 39 autocmd FileType html set softtabstop=2
 40
 41
 42 " For GUI
 43 if has("gui_running")
 44   colorscheme oceandeep
 45   set clipboard+=unnamed  " Yanks to clipboard
 46 endif
 47

Windows 7 Professional の 表示言語変更

手順：こちらの手順を参考 hinoji の Winodws 7 表示言語の変更の秘密

参考： Windows 7 SP1 Language Pack (English)
http://download.windowsupdate.com/msdownload/update/software/updt/2011/02/windows6.1-kb2483139-x64-en-us_9b9c8a867baff2920507fbf1e1b4a158572b9b87.exe

Ruby 1.9.3 を Mac にインストール

ruby-1.9.3-p0 を Snow Leopard にインストールした際に、yaml.h が無いというエラーがでた。

yaml.h is missing. Please install libyaml. Failed to configure psych. It will not be installed.

LibYAML をインストールしてから ruby-1.9.3-p0 をインストールするとエラーを回避できる。
参考：http://collectiveidea.com/blog/archives/2011/10/31/install-ruby-193-with-libyaml-on-centos/

LibYAML のインストール方法：

$ curl -O http://pyyaml.org/download/libyaml/yaml-0.1.4.tar.gz
$ tar xzvf yaml-0.1.4.tar.gz
$ cd yaml-0.1.4
$ ./configure --prefix=/usr/local
$ make
$ sudo make install

Kindle for Mac がもっさり

Programming Language Ruby の Kindle 版が $10 以下と大変お値打ち価格だったので初めてKindle の本を購入してみた。Kindle for Mac で読んでいるのだけれど動きがもっさり。さらには、Kindle for Mac の検索がうまく動かないので、Kindle の本を PDF に変換してみた。

calibre
http://calibre-ebook.com/

設定を変えて何度かPDFに変換をしてみたが、ページレイアウトが崩れて残念な結果に。終わったとさ。

Key bind for Vim

In an insert mode,
  "C - [", "C - {" are bound to ESC
  "C - h" is bound to BS
  "C - m" is bound to Enter