Cisco ip helper-address 详解

The internet

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[……]

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'Javac' is not an internal or external command solutions

Java Programming Development

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：

  1. Right-computer--> Properties-> The left side of the "advanced system settings"-> The "Advanced" tab –> Under the "environment variables"
  2. System variables，Creates a new variable named JAVA_HOME，Variable values[……]

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Color tag cloud WordPress without a plugin

Wordpress

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[……]

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Packet Tracer 5.0 6.0 mutiuser multiplayer Internet Guide

The internet
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[……]

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A simple example Cisco routers DHCP and DHCP relay configuration

The internet

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[……]

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Pocketed replaced rss address，Please resubscribe friends!

Exchange of Experience

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[……]

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Linux Redhat Xen Virtualization study notes

Linux

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-6782e88972[……]

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Wordpress theme how to adjust the default font size

Wordpress

2013November 4 New ......

Find style.css file，Edit this paragraph wherein the bottom

among themtitle aHere's edgeheightHome blog can adjust the height of the name，SuchThe name will not get together and dividing linesLa!

...... Updated，The following is the original -

The blog theme is being used off the grid I think we are not familiar hehe

Quite good looking

but，The default font is really little people catch chicken -word[……]

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The method of manually generating yum repository Redhat6

Linux

In Redhat6 future systems will exist yum repositoryYum database manually generatedThis issue

And several previous versions of the database are automatically generated

May be mirrored with redhat6 about it .xml files and package files are not in a place that no detailed research to explore next time

First determine yum of these packages have been fitted

There areyum yum-updatesd yum-security yum-metadata-parser yum-rhh-plu[……]

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