You may also be limited by the OS, if it still doesn’t seem to be working. Check the values in: /proc/sys/net/core/rmem_default /proc/sys/net/core/rmem_max If it’s TCP as you say in your example, and not actually a raw socket, you can also check the values in: /proc/sys/net/ipv4/tcp_mem If you run cat on these files they’ll show you … Read more
TCP’s primary design goal is to allow reliable data communication in the face of packet loss, packet reordering, and — key, here — packet duplication. It’s fairly obvious how a TCP/IP network stack deals with all this while the connection is up, but there’s an edge case that happens just after the connection closes. What … Read more
For my suggestion, please read the last section: “When to use SO_LINGER with timeout 0”. Before we come to that a little lecture about: Normal TCP termination TIME_WAIT FIN, ACK and RST Normal TCP termination The normal TCP termination sequence looks like this (simplified): We have two peers: A and B A calls close() A … Read more