Yum(Full name Yellow dog Updater, Modified) Is anFedoraandRedHatas well asSUSE、CentOSThe front-end package manager Shell。based onRPMPackage Management，Can be automatically downloaded from the specified serverRPMAnd the installation package[……]
How do network also has a year，Speaking today, a fewAgreement with "arp" in accordance withSome confused old，So I come here to be a simple distinction。
This is not difficult to understand，arp protocol used in the computer artTao own MAC address and IP addressin the case of，It used to get the peer IP address corresponding to theMAC address。of course，MAC table of a switch is acquired from here，This is why you generally installed network，PING test of timeThe first package always MISS[……]
Some time ago I wroteA simple example Cisco routers DHCP and DHCP relay configuration，Article uses a command to achieve theDHCP forwarding，But this function is exactly how to achieve it? Now let's learn more about this command。
When the terminal equipment andDHCP serverWhen not on the same broadcast domain，Intermediate devices need to specify an address to be broadcast packet forwarded out，That needs to be sethelper_addressTo achieve relay。
In fact，In the enterprise generally only need one or two DHCP servers to provide sufficient redundancy，complete[……]
These days began playing with a BlackBerry，Engineering mode，Java development environment is installed on the computer，But always after the installation prompts
'javac’ Not an internal or external command balabalabala ... ...
Google ~ solution：
- Right-computer--> Properties-> The left side of the "advanced system settings"-> The "Advanced" tab –> Under the "environment variables"
- System variables，Creates a new variable named JAVA_HOME，Variable values[……]
Off the grid is the default tag cloud tag cloud wp，Sizes，Color is actually very unified，This does not look very beautiful。
Is there any way to make it look better tag cloud? In fact, it is there，There are many plug-ins，All kinds，But for a tag cloud，Is again in the fast flip add a plugin seems quite wasteful。
So I found some simple ways to not use plug-in also implements the color tag cloud，This would seem better。
This is accomplished by such：
Edit the corresponding theme in the background functions.php[……]
Packet Tracer is an auxiliary company published by Ciscolearning tools，Learning courses for beginners to Cisco network design、Configuration、excludeNetwork failureProviding network simulation environment。Users cansoftwareofGraphical User InterfaceUse drag method to establish directNetwork topology，And provide detailed process data packets traveling in the network，Real-time observation of network operation。You can learn IOS configuration、Exercise troubleshooting capability。softwareAlso comes with more than four semesters have established a good demo environment、Challenging task，The latest version is Packet T[……]
Today came across configurationDHCP relayThe problem，Suddenly I found that I had actually not noticed，Even sometimes do not know how to engage，And later I had to Google it very awkward ......，Now recorded as follows：
I was not on the map topology，Simple words to describe：
R1(f0/1)————-(f0/1)R2(f0/0)——S1——PC0
192.168.1.0/24 172.16.0.0/16
For convenience，I'll do[……]
In order to better manage statistics and blog subscriptions，Off the grid to replace the rss subscription address
due toFlying HandsThis oneDomestic pitIt is people helpless，So back to the route or replace native Feed。
Other，Still full subscription。
Subscription address is
www.logcg.com/feed
And used as a plug-in to subscribe to blog statistics，This plug-in is calledMy Feed StatsTap to view the article description。
The following is a brief introduction to this widget
This Wordpress plugin statistics[……]
This is before the time of learning 5.8xen virtualizationThe study notes
Although always feltxenBut fast become a zombieVirtualizationThis aspect is undeniable his powerful
especiallyredhat6Cancelledxen，xenGiving a feeling to be eliminated but canceled support for xen in my opinion it would be unwise
Or talkxenThe other pull much hurt the body
First, create a file，I was hard enough because I of course you can also use lvm directly under the root directory created
[crayon-662aec5c9d[……]