QOTD
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| The five layer TCP/IP model |
| 5. Application layer |
|
DHCP • DNS • FTP • HTTP • IMAP4 • IRC • NNTP • XMPP • MIME • POP3 • SIP • SMTP • SNMP • SSH • TELNET • BGP • RPC • RTP • RTCP • TLS/SSL • SDP • SOAP • L2TP • PPTP • … |
| 4. Transport layer |
| 3. Network layer |
| 2. Data link layer |
|
ATM • DTM • Ethernet • FDDI • Frame Relay • GPRS • PPP • ARP • RARP • … |
| 1. Physical layer |
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Ethernet physical layer • ISDN • Modems • PLC • SONET/SDH • G.709 • Wi-Fi • … |
The Quote Of The Day (QOTD) service is an Internet protocol defined in RFC 865. It is intended for testing and measurement purposes.
A host may connect to a server that supports the QOTD protocol, on either TCP or UDP port 17. The server then returns a short arbitrary message. This was traditionally a random selection from a list of notable quotes.
The QOTD service is rarely enabled, and is in any case often firewalled to avoid 'pingpong' attacks (www.securityspace.com).
Current testing and measurement of IP networks is more commonly done with ping and traceroute.
[edit] QOTD servers
- quotes4all.net (tcp, udp) - Serves the quotes of the site.
- ota.iambic.com (tcp) - Agendus, a PIM for the Palm OS, has a 'Today' screen that includes a 'Quote Of The Day'.
[edit] Additional Info
You can test/learn about the server by opening a command prompt and typing telnet ota.iambic.com 17 A random quote will appear and the connection will close.
Interesting ideas include setting-up your own company QOTD server and providing your users with some useful information. Or you can add a connection to a QOTD server to the end of your login script to start your day with a refreshing insight.
