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Questions tagged [tcp]

TCP stands for Transmission Control Protocol and is one of the core protocols of the Internet Protocol Suite. TCP complements the Internet Protocol (IP), and therefore the entire suite is commonly referred to as TCP/IP.

TCP is just one communications protocol on the web. Others include:

  • User Datagram Protocol (UDP)
  • Internet Control Message Protocol (ICMP)
  • Hypertext Transfer Protocol (HTTP)
  • Post Office Protocol (POP3)
  • File Transfer Protocol (FTP)
  • Internet Message Access Protocol (IMAP)

TCP on Wikipedia

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[Send mail with attachment]: TCP Retransmission, Duplicate ACK => TCP Reset

So, we have a linux box with postfix running on LAN site A which sends emails to an Microsoft exchange server sitting on site B. This runs perfectly when there is no attachment to the mail. But as soon as there is an attachment with a size of around…
Michael Muller
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Unable to connect to local DB2 instance

I have installed an Enterprise version of DB2 on my local Windows 11 pro laptop for some development tasks. Installation proceeded without errors but, it seems I cannot connect using TCP. If I try to stop/start from the admin console, it says I do…
Andrea Girardi
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TCP connect <--> accept with INADDR_LOOPBACK range

I have some production code for a distributed system. Part of this code works by looking up (already established tcp) connections in a hash table, indexed by remote ip address. This code works correctly in a real cluster, with each server running on…
aspen100
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failure time out during tcp connection establishment stage

I want to learn VPX ADC in virtural environment. All the below 3 machines are connected via VMWare Workstation Bridged Network. Host-Windows 11, IP Address is 192.168.2.60 VM 1 - ubuntu20 ,apache server, IP Address is 192.168.2.56 VM 2 - Citrix ADC…
yunpei zhang
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TCP communication to internet broken - no SYN-ACK received

Given following network setup: Debian bullseye host (Proxmox VE) -> OPNsense firewall doing NAT -> DSL modem (connected via PPPoE) -> Internet The host isn't able to establish a tcp connection to any host in the internet. I tried to reach different…
Christian Rudolph
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Causes of packet loss on multiple persistent tcp connections simultaneously?

The issue was detected while analyzing some application logs, which reported few seconds long spike periods when messages from multiple clients are received on the server with a substantial delay (up to a couple of seconds). The application itself…
tonso
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LWIP TCP SERVER Hangs

I'm using LWIP v2.1.3 with TI F28388D Controller. I'm using LWIP as TCP server only mostly in ping-pong mechanism like : Client Server PSH--> <-- ACK <-- PSH ACK--> A windows client(host PC typically) will be connected to…
Pranay Gupta
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Why are certain TCP connections extremely slow, except while running a packet capture on the router?

I have a weird issue with my MikroTik RouterBOARD hEX - RB750Gr3 (running Router OS 7.8). Certain TCP connections are extremely slow, for example this 93 KB file takes ages to download from the clients in the router’s LAN: curl…
aaronk6
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Can't connect to MariaDB from internal VM Structure

S1 Virtual Machine 1: Ubuntu app server Virtual Machine 2: MariaDB 1 S2 Virtual Machine 3: Ubuntu app server Virtual Machine 4: MariaDB 2 from vm04 and 03 I can connect to DB1 with connection string with port 3306 but I can't connect DB2 from vm01…
gegentierversuche
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How to allow a tcp service (not http) on custom port inside kubernetes

I have a container running an OPC-server on port 4840. I am trying to configure my microk8s to allow my OPC-Client to connect to the port 4840. Here are examples of my deployment and service: (No namespace is defined here but they are deployed…
Viktor Eriksson
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OCF resource agent/script for permanently checking tcp socket on layer 4?

How to utilize the OCF, Pacemaker and Corosync to permanently check the availability of a tcp socket? For the handling of certain services from within Pacemaker/Corosync I would like to constantly monitor a remote tcp socket. Similar to a…
M. Schmidt
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ssh tunnel high latency with multiple connections

hi I'm running an Ubuntu 20.04.5 server I'm using it for dynamic port forwarding kinda like a vpn but the problem is when I'm downloading something or there is multiple connections ping increases drastically 500ms-1000ms but if I run two tunnels…
Aria5641
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Is there a way to exclude a network interface from being bound via INADDR_ANY?

In network programming, it's common to pass INADDR_ANY (or IN6ADDR_ANY) as part of the second argument to bind(), telling the networking stack that you want the socket to receive connections/traffic from any network interface that the machine…
Jeremy Friesner
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tcp syn is blocked, cant make a connection

so this is my current setup of openvpn+stunnel user>>internal-server-A(as stunnel client)>>main-out-of-country-server(running openvpn and stunnel as server) it worked fine in a restricted country for a while. but now tcp and udp connection from…
IMIEEET
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Routing only tcp outgoing traffic through a tun0 interface

I have an ubuntu 20 system, and I'm trying to create a tunnel between my system and a remote server since my client system can't have any incoming/outgoing TCP traffic. I created a tun0 virtual interafce and I only want TCP packets to be routed to…
Yarden
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