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ICMP is just different protocol from UDP. There's field "Protocol" in IP packet. 0x01 = ICMP, 0x06 = TCP, 0x11 = UDP. I think that this article gets terminolog

ICMP is just different protocol from UDP. There's field "Protocol" in IP packet. 0x01 = ICMP, 0x06 = TCP, 0x11 = UDP. I think that this article gets terminology wrong. It's not UDP socket that gets created here, but Datagram socket. Seems to be bad API naming in Rust library.

stavros 11mo ago
> It's not UDP socket that gets created here, but Datagram socket A datagram socket is a UDP socket, though. That's what the D stands for.
- jmgao 11mo ago
  Wrong way around: UDP sockets are datagram sockets, there are datagram sockets that are not UDP.
- jdndbdbd 11mo ago
  No? Why would you think a datagram socket is UDP?
  - stavros 11mo ago
    What a reasonable question to be asked today.
    - messe 11mo ago
      What networks are you using without ICMP? Presumably you're also using systems that don't support Unix Domain Sockets which can be configured as SOCK_STREAM, SOCK_DGRAM, and even gasp SOCK_SEQPACKET (equivalent to SOCK_DGRAM in this case admittedly).
    - cstrahan 11mo ago
      Let me rephrase GP into (I hope) a more useful analogy. — actually, here’s the whole analogous exchange: “A rectangle is an equal-sided rectangle (i.e. “square”) though. That’s what the R stands for.” “No? Why would you think a rectangle is a square?” Just as not all rectangles are squares (squares are a specific subset of rectangles), not all datagram protocols are UDP (UDP is just one particular datagram protocol).
      - stavros 11mo ago
        The obvious answer is "I didn't know datagrams were a superset of UDP". I don't really understand how "how do you not know this" is a reasonable or useful question to ask.
- Quarrel 11mo ago
  To give a more nuanced reply versus the "you're wrong" ones already here, the difference is that UDP adds send and receive ports, enabling most modern users (& uses) of UDP. Hence, it is the "User" datagram protocol. (it also adds a checksum, which used to be more important than it is nowadays, but still well worth it imho.)
- meindnoch 11mo ago
  Not every cola is Coca-Cola, even though "Cola" stands for cola.
- pwdisswordfishy 11mo ago
  In related news, all rectangles are squares and all animals are dogs.

stavros 11mo ago

> It's not UDP socket that gets created here, but Datagram socket A datagram socket is a UDP socket, though. That's what the D stands for.

jmgao 11mo ago
Wrong way around: UDP sockets are datagram sockets, there are datagram sockets that are not UDP.
jdndbdbd 11mo ago
No? Why would you think a datagram socket is UDP?
- stavros 11mo ago
  What a reasonable question to be asked today.
  - messe 11mo ago
    What networks are you using without ICMP? Presumably you're also using systems that don't support Unix Domain Sockets which can be configured as SOCK_STREAM, SOCK_DGRAM, and even gasp SOCK_SEQPACKET (equivalent to SOCK_DGRAM in this case admittedly).
  - cstrahan 11mo ago
    Let me rephrase GP into (I hope) a more useful analogy. — actually, here’s the whole analogous exchange: “A rectangle is an equal-sided rectangle (i.e. “square”) though. That’s what the R stands for.” “No? Why would you think a rectangle is a square?” Just as not all rectangles are squares (squares are a specific subset of rectangles), not all datagram protocols are UDP (UDP is just one particular datagram protocol).
    - stavros 11mo ago
      The obvious answer is "I didn't know datagrams were a superset of UDP". I don't really understand how "how do you not know this" is a reasonable or useful question to ask.
Quarrel 11mo ago
To give a more nuanced reply versus the "you're wrong" ones already here, the difference is that UDP adds send and receive ports, enabling most modern users (& uses) of UDP. Hence, it is the "User" datagram protocol. (it also adds a checksum, which used to be more important than it is nowadays, but still well worth it imho.)
meindnoch 11mo ago
Not every cola is Coca-Cola, even though "Cola" stands for cola.
pwdisswordfishy 11mo ago
In related news, all rectangles are squares and all animals are dogs.