Threat Level: green Handler on Duty: Jim Clausing

SANS ISC: Port 9 (tcp/udp) Attack Activity Port 9 (tcp/udp) Attack Activity

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Port Information
Protocol Service Name
tcp discard Discard
udp discard Discard
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User Comments
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George Assai 2003-11-02 19:25:33
This RFC specifies a standard for the ARPA Internet community. Hosts on the ARPA Internet that choose to implement a Discard Protocol are expected to adopt and implement this standard. A useful debugging and measurement tool is a discard service. A discard service simply throws away any data it receives. >>TCP Based Discard Service One discard service is defined as a connection based application on TCP. A server listens for TCP connections on TCP port 9. Once a connection is established any data received is thrown away. No response is sent. This continues until the calling user terminates the connection. >>UDP Based Discard Service Another discard service is defined as a datagram based application on UDP. A server listens for UDP datagrams on UDP port 9. When a datagram is received, it is thrown away. No response is sent.
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