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.

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10 NICs in 1U box - possible?

I am looking for a device with 10 NICs in one 1U box. The CPU can be anything even a microcontroller as long as it can process TCP packets. I would prefer a sort of Linux on it but is open to other ...
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Proxy which retries failed connection

I have a closed-source Java application which opens many TCP connections to a speific host:port. The problem is that remore server often either fails to open the connection or resets the connection ...
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Apache LB and huge amount of close_wait connections

I use apache as a loadbalancer for servers with some java apps. On the apache host I saw huge number of close_wait state which was around 2500. Is it a problem with apache itself or with app on the ...
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How to calculate average RTT of my clients

I want to calculate the average RTT of my clients when they are trying to establish a connection with my server (let's say a web server on port 3000), is there any ready tool or Linux command ? or is ...
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Which setting is limiting my active connections (ip_conntrack)?

I have a webserver with ispconfig (mysql & php & nginx). My munin statistic shows that there are the connecitons limited to about 9k. But I can't find a settings which is about 9000 which I ...
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Troubleshooting LAN Transfer using IPERF

Apologies in advance, i am very foreign/new to this stuff. I am trying to transfer GoPro files from my desktop PC to an rPi media server. Ive been using WinSCP before, and it always worked great, but ...
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50 views

nginx TCP forwarding with GeoIP

CentOS 7.8 nginx version: nginx/1.18.0 yum install nginx-module-geoip yum install GeoIP GeoIP-data Then, GeoIO runs well with HTTP(S). I need nginx to forward a TCP port, which is only open to CN add ...
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33 views

Using netsh to portforward to a VPN

I have a VPN client set up on my Windows machine connecting to a VPN elsewhere. I have a small embedded Linux device on the same local network as my Windows machine which needs to communicate through ...
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59 views

Delay TCP SYN retransmission on Linux

Our application connects to a device on a radio network. The network has to wake up the device before it can communicate which takes about 3 seconds. In this 3 seconds our CentOS (Linux 3.10.0-957.62....
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URL redirection and TCP proxy in haproxy

In a server with only one ipv4 and running haproxy, i want to redirect an url and proxy another in TCP level, for ssl passthrough purpose. frontend https-frontend bind *:443 mode tcp option ...
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What is TCP-over-TCP and how does OpenVPN under TCP mode avoid the issue?

This article explains why TCP-over-TCP could be a performance disaster. My understanding about the issue is that the 'outer' TCP connection deals with packet loss and congestion of the network and ...
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Redirecting all outbound traffic to loopback for VPN program

I haven't been able to find much information on how a VPN would work from a programming perspective. I figured you'd have to reroute all packets from localhost to a local application, and therefrom ...
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TCP modification in-the-middle and acknowledge number

For some private purposes I need to enrich HTTP header with additional information (which will be handled by app on the HTTP server side). The basic idea was to modify received packet, send it to ...
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How can I isolate a single TCP connection on Wireshark?

I just started using Wireshark for network troubleshooting purposes and I am a little confused about one thing. I requested a webpage and for the next 10s I monitored the data. I then used the filter ...
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229 views

“An existing connection was forcibly closed by the remote host” when trying to connect to azure sql server

I'm trying to deploy a SQL database to my azure SQL server. When I'm trying to connect to my target server, I get the error listed below. I'm using Microsoft SQL Server management studio 18 with ...

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