Name
Source Port
Synopsis
Identifies the application that generated the segment, as referenced by the 16-bit TCP port number in use by the application.
- Size
Sixteen bits.
- Notes
This field identifies the port number used by the application that created the data.
- Capture Sample
In the capture shown in Figure 7.18, the Source Port field is set to hexadecimal 00 50, which is decimal 80 (the well-known port number for HTTP). From this information, we can tell that this segment is a reply, since HTTP servers only send data in response to a request.
Figure 7.18. The Source Port field- See Also
Get Internet Core Protocols: The Definitive Guide now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
