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Many people who send spam use programs called mail harvesters to search the Web looking for e-mail addresses This means any time your e-mail address is listed, displayed, or otherwise included on a web page, you open yourself to potential spam What tips these harvesting programs off is the at symbol (@) in your e-mail address, because we all know an e-mail address can t exist without one of those symbols So the key to spam-proofing your e-mail address is not to display it with an @ symbol Using [at] Instead of the @ Symbol A quick, pure-text way to avoid displaying your complete e-mail address on a web page is to replace the @ symbol with something like [at] so that savvy visitors can still get your e-mail address, but the harvesting programs miss it This might make your e-mail address look something like this: me[at]mailcom This only works if you merely display the e-mail address, and don t link to it For more on that, keep reading Using an Image to Replace the @ Symbol The second easiest way to spam-proof displayed e-mail addresses is to replace the text @ symbol with a graphic @ symbol This causes your site s visitors to see the e-mail address in its entirety, but fools e-mail harvesters because they don t read images However, this and the previous technique only work to hide e-mail addresses that are merely displayed in the browser If you re linking your e-mail address so people can click it to send an e-mail, you must also hide the version of the e-mail address embedded in the a tag To do so, try one of the following two tricks

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12 presents the migration from IPv4 to IPv6 and explains that NAT between IPv4 and IPv6 is not a mandatory feature according to IETF Cisco decided to provide the NAT feature related to both protocols and address translation between IPv6 and IPv4 in IOS from the beginning This is an important value-added feature that will greatly simplify the introduction of IPv6 in Enterprise Networks

Using Code to Replace the @ Symbol The problem with the first two ways to spam-proof your e-mail address is that they only work if the e-mail address is displayed and not linked For example, consider the following:

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While the e-mail address is not displayed in the browser view, it s still embedded in the code When you include your actual e-mail address in the code of a mailto link, harvesting programs reading the actual HTML will still find it! One way to hide the e-mail address in the mailto link is to replace the @ symbol and period with their decimal equivalents This means me@homecom might look like:

Table 11-19

Here, @ is the decimal equivalent of the @ symbol and . is the equivalent of a period The complete a tag using this technique looks like this:

11:

NAT devices would enable the interconnection of hosts that have IPv6only addresses (hosts that do not have IPv4-compatible addresses) with hosts that have IPv4-only addresses If assigning globally unique IPv4 addresses would become impossible (due to the exhaustion of the IPv4 address space) before a sufficient number of the Internet hosts would transition to IPv6, then NAT devices would allow continuing (and completing) the transition, even in the absence of the globally unique IPv4 addresses Cisco IPv6 NAT is designed to allow an IPv6 network to access and be accessed by the IPv4 Internet

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The vast majority of e-mail programs recognize these decimal characters and will replace them with the appropriate equivalents when preparing the actual e-mail Using JavaScript to Hide the E-Mail Address Arguably the most effective way to avoid spammers and still include a mailto link is to hide the e-mail address with some sort of scripting language or other type outside of HTML, such as JavaScript The following sample script would be placed within your HTML code exactly where your <a href="mailto: me@homecom"> should have been

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<script language="JavaScript"> <!-var name = "me" var domain = "mail" var ext = "com" documentwrite('<a href=" + 'mail' + 'to:' + name + '@' + domain + '' + ext + ">E-mail Me</a>'); //--> </script>

Define the Products table as follows: ProductNumber, number, primary key ProductName, VARCHAR UnitPrice, long

When displayed in a browser, this script prints E-mail Me and links it to me@mailcom, all the while never displaying the complete e-mail address in a way spammers can interpret

With the design decision made in the implementation of IPv6, Cisco confirms to be the leading company in IP routing The Internet is today mostly powered by Cisco routers and so are many Intranets The Cisco implementation of IPv6 will greatly simplify the migration phase from IPv4 to IPv6 and the unavoidable coexistence of IPv4 and IPv6 nodes From the end of 1998 IPv6 will be a standard feature of Cisco s strategic IOS-based routing and switching platforms

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