Hopefully this will start a new conversation. I've tried to describe the
difference between Ports and Sockets. Your thoughts are welcome...
Port Numbers are used by IP to pass information to the upper layers; they
provide the mechanism for cooperating applications to communicate. Numbers
below 1024 are well known ports, and above 1024 are dynamically assigned
ports. You will usually find registered ports are for vendor specific
applications in the range above 1024.
Here are some common IP Ports:
20/21 FTP
23 Telnet
25 SMTP
37 Time Service
49 TACACS
53 DNS
67 BootP Server
68 BootP Client
69 TFTP
110 POP3
161 SNMP
IPX sockets are part of the IPX stack, and are used much like port numbers
in IP; they direct data encapsulation in the IPX Header to the appropriate
upper layer protocols. There are well-known ones, others that are assigned
to proprietary applications, and a series of numbers used randomly by
clients, just like in IP. Also like IP ports, they identify the process on
the server or client that needs to get the data in the packet.
Here are some common IPX sockets:
0x451 NCP
0x452 SAP
0x453 RIP
0x455 NetBios
0x456 Diagnostic
0x457 Serialization
0x85be IPX EIGRP
0x9001 NLSP
0x9004 IPXWAN
0x9086 IPX Ping
The AppleTalk protocol suite also uses sockets. Socket numbers 1-127 are
statically assigned (RTMP uses 1, ZIP uses 6, etc).
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