标题: Home Networking
superdog




UID 1
精华 0
积分 1540
帖子 570
阅读权限 102
注册 2005-4-27
发表于 2007-7-18 10:48 PM  资料  个人空间  短消息  加为好友 
Home Networking



QUOTE:
原帖由 Sunflower 于 2007-7-17 08:00 AM 发表
有兴趣听课,不过不要太technical。首选home networking.

刚刚敲完, 但觉得很可能文不对题, 也许回答地不是你的问题. 而且可能恰恰是枯燥的技术. 已经敲完了, 干脆就贴上吧.

牛吹了, 下当真, 不知能不能得好. I'll start simple. 内行的就包涵着了.

When I talk about "Home networking" here, I refer to those homes that have high speed internet connections (broadband), and have more than one computers at home sharing the same broadband connection to get online.

Most readers can skip the first section, unless you are interested in how to set up your modem.

Section I. Your “modem”

Typical broadband technologies in North America homes are cable modem or DSL (Digital Subscription Line). Some folks also use satellite dish. I believe in China many people still use ISDN.

However, for ordinary folks, me included, the underlying broadband technology should not matter except during your first time install. Afterwards, these connections should generally be stable. I’ll touch very briefly if you do have to install for yourself.

Normally, the broadband vendors provide you with a “modem”. If it is cable modem, there is definitely one port to plug in your coaxial cable in.  If it’s DSL, it has a phone jack to plug in your phone line in. In both cases, they provide the interface to the outside world.

These modems will for sure all have at least one other connection port – Ethernet connection port. This is the one that will connect to your home network.

Since home network all ubiquitously use IP network. Let me throw in a basic concept of “IP address”.  You can safely assume very computer on a network has an IP address. That’s like to say every live phone will have a “phone number”.

The reason I bring up “IP address” at this time is because we are discussing that “modem”. That magic modem brings a dear IP address to your home when you sign up for the internet service with your ISP (Internet service provider) much like your phone line brings in a phone number when you sign up your phone service with your phone company.



If you have only one computer, you use an Ethernet cable (cord, line whatever you call it) to hook up your computer to that Ethernet port on the modem, then you are pretty much done. However, that won’t be much of  a “home network”. For the rest of us, we may have more than one computers at home. We want all of them to access the internet. That’s where your real home network starts.


Section II. Your Router  

If you have read through section I, you most likely have wasted some precious 5 minutes of your life J Why?  In most cases, you perhaps don’t really need to know all those gritty details about the modem.

For all practical purposes, all you really care is that on one port of that “modem” (or whatever thingy-majigger your ISP gives you) will come out a holly IP address.  

The next biggest thing in your home network is a router. A typical home router has one port (normally marked as WAN) that you connect to your modem Ethernet port. Then there are typically four more ports that you can hook up to your computers. (We’ll talk about wireless features in the next section.)

Think of this router as a phone switchboard in a small office. The phone company provides your small business with one phone number, say 602-123-4567, but everybody in the company wants to make outside phone calls. A switchboard comes to the rescue.

A switchboard assigns extension numbers to each phone. Remember those small business answering machines: for John please dial 104, for Lisa dial 105? Those numbers are PRIVATE extension numbers. They are meaningless outside your company. Also note, if either John or Lisa makes an outside call from their respective extension phone, the caller ID will show the company 602-123-4567 number for either of them!  

A router acts similarly to your computers as the switchboard to the company phones. All home routers on the market nowadays (LinkSys, D-link, NetGear to name a few) come with a DHCP server (Dynamic Host Configuration Protocol, blah, blah, don’t worry about these acronyms) that can assign IP addresses to the computers in your home. The home router typically uses 192.168.?.xxx IP address. Any IP address starts with 192.168 is a PRIVATE IP address. They are meaningless on the internet just as those 105, 106 phone extensions are meaningless outside the company.

Here is how the router works. When your computer with a private IP address, say 192.168.0.101, tries to get online to browse www.nawomen.com, the router will piggyback your request onto that “holly IP” address that your ISP assigned to your “modem”. The implication is that no matter how many home computers you have, if you access the internet, they will all show up online with the same public IP address (just like the caller ID example I mentioned earlier).

One side effect of these private IP address is it provides a little extra security from outside attackers. Because a non-sophisticated attackers don’t have a good way to figure out what your internal computer IP addresses are. (Just like those commercial caller may have hard time to call your desk without knowing your phone extension ). Of course, for professional hackers, they don’t present much of an obstacle.

Section III. Basic Configuration

Enough theory!  Now you have got your router, you hooked up your computers. How do you go about configure your router so it can dish out the private IPs to your computers, so they can all share the same “holly IP”? (sorry, it’s actually called a public IP, since it can be routed on the public internet).

You may need to read your install manual that comes with your router at this moment, but if my bet is right, most time your router is accessible from browser as http://192.168.0.1 or http://192.168.1.1. The default user name is “admin” password “admin” or “linksys”. Now this might be a good time to check if that’s still true. If it is, then you should give your significant other some hard time. Because he might have left a big security hole in your home network, hackers can easily get into your network if your wireless connection is not secured, and your password is no-secrete!

Once you browse to your router admin page, you can choose to change the password. You can also choose how it should dish out IP addresses. (You can set IP range, or you can even go static IP – a different topic outside the scope of this discussion).

For the most part, the home router you buy from the local Best Buy store should just work as-is out-of-the-box. The most common task for router configuration is perhaps for wireless router.

Section IV. Wireless Router Configuration

You should always choose secured wireless connection. The common secure connection options are WEP, WAP and MAC address based.

WEP is the most common one. That’s the one I chose. If you chose WEP, then the router admin page will show you the WEP key. Any computer wants to connect to your router needs to provide a correct key.

WAP is more secure than WEP. I don’t remember off the top of my head the parameters. If you choose WAP, just follow the instructions. MAC address is a bit more involved for beginners. I’ll skip.

The bottom line is to make sure you choose a secured wireless option on the router. Otherwise, your neighbor or anybody on the street for that matter can use your wireless connection to surf the net. That can be nasty. So avoid that.

Closing Words

As I finishing typing this home network fluff, I realized I might be off the mark. May be your original “home network” question is entirely a different topic in your mind. Such as how do I configure users, computers or printers, so my home network can work as I want it to.

If that’s the case (now I figure that most likely is the case), I apologize. But I already typed up so much blah blah. So I’m just going to post it as-is.

If you have specific home network question, or if you have questions or criticism about this post, please let me know. I’ll try my best to answer. Until then, so long!


顶部
Sunflower





UID 11827
精华 2
积分 1917
帖子 1621
阅读权限 100
注册 2007-3-17
发表于 2007-7-19 09:31 AM  资料  个人空间  短消息  加为好友 
Thanks Superdog!  

I always appreciate people who is willing to offer their helping hands.   I don't mind you type so much blah balh, I could simply skip some topics if I am not interested and you have already categorized the topics clearly .  In fact, the posting gave me a good overview of the subject.  

I do have specifc question.  I would like to setup our printer to be shared by the laptop and computer.  So I can send the doc to printer directly from laptop.  Could you please touch this topic a bit? Thanks in advance.

I guess the security also could be a good topic,  good anti-virus and anti-spyware freeware you already mentioned.  How to hide IP address from public viewing to protect the potiential attack? I saw there is freeware that is offerring this kind of features, but am not sure if it is useful.  For the people that have kids, any way could prevent the kids from viewing some specific sites?

Thanks again for sharing your knowledge.

[ 本帖最后由 Sunflower 于 2007-7-19 11:32 AM 编辑 ]

顶部

Google
Web nawomen







{/if} 当前时区 GMT-7, 现在时间是 2017-11-19 12:43 PM

    本论坛支付平台由支付宝提供
携手打造安全诚信的交易社区 Powered by Discuz! 5.5.0  © 2001-2007 Comsenz Inc.
清除 Cookies - 联系我们 - 北美女人创作群 - Archiver - WAP
{if }