雜七雜八的小筆記!

此篇會講到以下相關這幾個功能:
    1. CentOS 7.0 啟動OpenVPN service.
    2. 限制VPN Client只能連到公司內部的10.10.0.0/16 網段 (使用iptables)
    3. 將ca.crt , client.crt , client.key , ta.key憑證包進.ovpn檔方便VPN Client使用者方便使用.

查看時區的設定為何?
# timedatectl

The Dell N3048 has to config below,

    1. add "VLAN interface IP"

    2. add "static route"

    3. add command "ip routing"

The Juniper SRX240 has to config below,

    - add a "interface IP", if the SRX240 is routing to N3048. 

Environment:

VLAN 1:

        VLAN 1 interface IP: 10.10.0.254/16

        Laptop A IP: 10.10.1.1/16

VLAN 2:

        VLAN 2 interface IP: 192.168.0.254/16

        Laptop B IP: 192.168.1.1/16

The interface ge-0/0/0 is uplink only.

問題: Windows 8/8.1 預設的「Windows 相片檢視器」看照片時，照片會有偏黃的問題。

原因: ICC色彩設定檔出了問題。

解決方法如下:
至「控制台」→點選「色彩管理」→在"裝置(D):"的下拉選單選擇「<你的顯示器名稱型號>」→打勾「在此裝置使用我的設定(U)」→移除「<原本的ICC設定檔>」→然後新增「sRGB IEC61966-2.1」的ICC設定檔→最後就點選「關閉」。

A very good easy proxy server base on windows.

Name is CCProxy.

Official site: http://www.youngzsoft.net/ccproxy/

1. The table doesn't have foreign key.

>> USE DatabaseName;

>> TRUNCATE TABLE TableName;

2. The table has foreign key.

>> USE DatabaseName;

>> DELETE [TableName];

>> DBCC CHECKIDENT('TableName', RESEED, 0);

1. Open "Sql Server Configuration Manager".

1. 開啟「新增/移除程式」選單:

「cmd」→下指令「appwiz.cpl」

2. 開啟「系統服務」選單:

「cmd」→下指令「services.msc」

step 1: 使用"管理者權限"打開「命令提示字元」

step 2: 下指令> net user administrator /active:yes

Step1)

# vim /etc/udev/rules.d/70-persistent-net.rules
-----------------------------------------------------------------------
# PCI device 0x14e4:0x1680 (tg3)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:7b:d8:06", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eno16777736", NAME="eth0"
-----------------------------------------------------------------------

or

-----------------------------------------------------------------------
# PCI device 0x14e4:0x1680 (tg3)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:7b:d8:06", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eno*", NAME="eth0"
-----------------------------------------------------------------------

環境: CentOS 6.5 64-bit

Download Packages:

----------------------------------------------------------------------------------------

1. http://www.centreon.com/

(1) Centreon Web

http://www.centreon.com/Content-Download/donwload-centreon

2. http://www.nagios.com/

(1) Nagios Core

http://www.nagios.org/download/core/

(2) Nagios Plugins

http://www.nagios.org/download/plugins/

(3) Nagios Addons

NRPE:

http://www.nagios.org/download/addons/

NDOUtils:

http://www.nagios.org/download/addons/

----------------------------------------------------------------------------------------

由下列訊息可以看到紅色部份就是被Firewall擋下來的session.

root@SRX-3400> show security flow cp-session source-prefix 192.168.192.192

上圖為我們的環境架構。

我們主要的設定皆在NAT Server(CentOS 6.5)上，eth0為10.10.1.1/16, Gateway為10.10.0.254，eth1為192.168.212.82/30，eth2為192.168.212.85/30

情境: 由eth1過來的封包且source ip為100.66.1.1/32, 100.66.1.2/32, 100.66.1.3/32. 這些封包將NAT為192.168.212.85並且由eth2出去。