How Multiple Server Hosting impacts your web site's uptime

Written by Godfrey Heron

Continued from page 1

Failover Monitoring

However,repparttar round robin DNS strategy solves this predicament, by mapping your domain name to more than one IP address. Select hosting companies now employrepparttar 142037 DNS round robin technique in conjunction with 'failover monitoring'.

The DNS round robin failover monitoring process starts by a web hosting company setting up your site on two or more independent web servers (preferably with different IP blocks assigned to them). Your domain name will therefore have 2 or more IP Addresses assigned to it.

Thenrepparttar 142038 failover monitor watches your web server(s) by dispatching data to a URL you specify and looking for particular text inrepparttar 142039 results. Whenrepparttar 142040 system detects that one of your IP addresses is returning an error, andrepparttar 142041 others aren't, it pulls that IP address out ofrepparttar 142042 list. The DNS then points your domain name torepparttar 142043 working IP address/s

If any of your IP's come back online they are restored torepparttar 142044 IP pool. This effectively and safely keeps your site online – even if one of your web servers is down.

The average failure detection and recovery time with a system like this can be as low as 15 minutes. This time varies depending onrepparttar 142045 speed of your site andrepparttar 142046 nature ofrepparttar 142047 failure and also how long other ISP's cache (save) your DNS information.

The time taken for other ISP's caching your information can be manipulated inrepparttar 142048 failover monitor by loweringrepparttar 142049 "time to live" (TTL) cache settings. These arerepparttar 142050 settings that other ISP's will use to determine how long to cache your DNS information.

Of course you must bear in mindrepparttar 142051 matter of how frequently data is synchronized between your website's servers. This will berepparttar 142052 hosting company's responsibility, and this may become complicated where databases and user sessions are involved.

The very expensive hardware based failover monitoring systems that point a virtual IP address to other ISP's, while behindrepparttar 142053 scenes juggling a number of unique IP addresses on different servers, is of courserepparttar 142054 most 'elegant' solution to multi server hosting.

That way,repparttar 142055 whole issue of ISP's caching your information does not come into play.

Therefore, for websites that need to have true 99.99995% uptime, without huge outlays of money,repparttar 142056 technology is readily available and certain proprietary failure monitoring systems are now relatively cheap to apply.

Godfrey Heron is the Website Manager of Irieisle Multiple Domain Hosting Services. Sign up for your free trial, and host multiple web sites on one account.

YAWNA - Yet Another Wireless Networking Article

Written by Erich Heintz

Continued from page 1

So here’s what Johnny does. First he configures his computer to use your wireless network instead of his own, taking an extra minute to make sure that he spoofs any information that may uniquely identify his computer. Next, he searches repparttar web a bit forrepparttar 142009 perfect online vendor to acquire his product. He avoidsrepparttar 142010 biggest andrepparttar 142011 smallest vendors. The largest vendors tend to be very thorough in credit card validation as they have solid resources at their disposal. The smallest vendors are often quite thorough as well as loss due to fraudulent transactions impacts them dramatically. He searches for a middle ofrepparttar 142012 road vendor, one with a reputation for lousy customer service, inrepparttar 142013 hopes they won’t bother verifying thatrepparttar 142014 shipping address is valid forrepparttar 142015 credit card being used.

Once he locates a suitable vendor he placesrepparttar 142016 order and has it shipped to your next door neighbor. Why there? Well, he doesn’t actually know thatrepparttar 142017 wireless network he is using is yours and doesn’t really care. What he does know is your next-door neighbor leaves repparttar 142018 house every morning promptly at 7:30 and doesn’t return until at least 6:00 inrepparttar 142019 evening. This leaves opportunity to safely retrieverepparttar 142020 “tried to deliver while you were out” slip that will be left behind byrepparttar 142021 parcel delivery driver. The following morning he will reattachrepparttar 142022 delivery slip torepparttar 142023 door, with instructions to leaverepparttar 142024 package onrepparttar 142025 doorstep. A few hours later he picks up his package, leaving no trail leading back to him.

Conclusion ---------- More than likely this single incident will disappear without further involving you or Johnny. The owner ofrepparttar 142026 credit card will disputerepparttar 142027 charge, andrepparttar 142028 credit card company or vendor will end up eatingrepparttar 142029 loss andrepparttar 142030 story ends. Of course, there’s alwaysrepparttar 142031 chance that some motivated investigator will followrepparttar 142032 trail back through your internet provider and ultimately to you. You may not be going to jail over it, but you’ll likely be having a few uncomfortable discussions with some gentlemen wearing badges.

The fact is this isn’t an original scenario. This type of scam has been run over and over again and dates back decades beforerepparttar 142033 internet explosion. It has dozens of variations and permutations. What is important is that this time around you have become part ofrepparttar 142034 equation. By ignorance or by apathy you are inrepparttar 142035 middle of something bad that you never imagined could have happened.

About The Author ---------------- Erich currently specializes in providing network and security solutions for small to medium businesses that frequently have to resolve the conflict of need versus budget. His commitment to precision and excellence is eclipsed only by his fascination with gadgets, particularly ones that are shiny, or that blink, or that beep. If you would like to contact Erich you can e-mail him at

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