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Mike's Computer Resources（转）
edle 发表于 2005-6-30 4:23:00

Mike's Computer Resources

Computer Information Resources

This page provides some starting points for exploration, with an emphasis on computers. If you have suggestions for additions to this list, please send mail to mikep@noc.utoronto.ca.

On this page: [General] [Security] [Spam] [Networking] [Nameservice (DNS / 'named')] [Time Service (NTP / 'xntpd')] [IPv6] [WWW Info] [Unix Info] [Sun Info] [SGI Info] [HP Info] [Windows 9x/2000/XP Info] [MSDOS Info] [USENET News Info] [UPS Info] [Network and Systems Management Info] [Database Info]

General

Security

Spam

The following measures have been taken to reduce (eliminate if possible) the use of systems I manage from receiving e-mail spam. I have filters at the initial SMTP connection, and the "MAIL FROM:"/"RCPT TO:" addresses are checked for validity.

I maintaining "blocking lists" (the 'rc.antispam' IP route blocking list, and the 'access' SMTP MAIL FROM:/RCPT TO: pattern blocking list) of hosts and/or IP addresses and/or e-mail addresses from which my servers will not accept mail (or any other kinds of connections such as HTTP) under any circumstances.

There are 3 categories of sites that may appear on the list:

  • dedicated junk mailers (e.g. 'cyberpromo.com') / cracker havens.
  • sites that are the source of a lot of spam, have non-responsive administrators, but also have legitimate users. [This category may be problematic, as I may want to exchange mail with some of these domains.]
  • temporary offenders.

The addition and removal of sites to/from the "blocking" list is also of concern. The following policy is used for adding sites to the list:

  • After the second incident if there is no response from the ISP responsible for the offender.
  • After the third incident regardless.
Note that a site can be added to the blocking list for other abuses other than spamming - e.g. continued TELNET / FTP / HTTP attacks on our servers.

The following policy will be used for removals from the list:

  • Contact from an administrator at the ISP responsible for the offender saying the account has been closed or some such similar action has been taken.

Other useful anti-spam links:

Networking

Nameservice (DNS / 'named')

Time Service (NTP / 'xntpd')

IPv6

WWW Info

Notes on WWW search engines, courtesy of e-mail/spam from The Did-it Team, supposedly about inside information revealed in "Did-it's Search Engine Secrets:"

Alta Vista - References first 30 words on page for description unless you use META TAGS. Alta Vista determines the priority of matches by indexing the words closest to the beginning of the front page.

Infoseek Indexes the first 200 characters of your site after the HTML <BODY> tag unless you use META TAGS in the creation of your site. Your description can include up to 200 characters of text.

The Lycos engine compares each page to your query and gives higher scores to pages that contain the words as you typed them into your Web Site. It also looks for pages that mention these words early on, rather than far down.

Yahoo searches for words in URL, title & description (<25 words) YOU ENTERED when submitting URL!

Webcrawler - Webcrawler computes its confidence rating by considering how many times the terms in your search occur in that document. The more frequent, the more relevant.

Unix Info

Sun Info

SGI Info

HP Info

Windows 9x/2000/XP Info

MS-DOS Info

USENET News Info

UPS Info

Network and Systems Management Info

Database Info

This page is maintained by Mike Peterson, mikep@noc.utoronto.ca.
Created January 15, 1997. Last updated June 20, 2005.

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