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Questions tagged [tcpip]

TCP and IP are two important protocols used in networking today. Due to their importance, the Internet Protocol Suite is also commonly known as "TCP/IP"

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TCP Session drops because of FIN signal

I have two servers communicating with each other through ISO 8385 messages over TCP sessions. Basically host-to-host interface between two payment switches. The problem is that the session keeps dropping and when we investigated the reason (TCP…
Mohammed Tellesy
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How to cause a network down event on a server?

This may seem weird, but I actually would like to cause a network failure on a project I'm working on. It's a microcontroller that is running tcp/ip and I just want to see what would happen if the network got dropped somehow. I want to ensure the…
user3308807
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What exactly makes TCP limit Cwnd with "cubic" congestion control

I have slower than expected download speed from a server (Debian sever->Windows PC, if that matters). Iperf3 shows no retries but confirms the slow bitrate. Iperf3 output (iperf3 -s on windows PC, then iperf3 -c from the problematic…
user984716
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TCP packets being lost

I have some TCP packets being lost. I have monitored the interface with tcpdump pcap file - https://www.dropbox.com/s/7m3hr1b7065tenx/tcp.pcap?dl=0 I noticed that when I lose packets I only get 5 frames whereas I usually see 9. Example lost…
Ruby dev
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Is there a registry value to force a connection to close?

I have an ethernet connection that I want to close if it's not sending or receiving any data. Is there a registry value I can set or any configurations I can change? For windows 10, thanks Edit: Maybe something like TcpTimedWaitDelay set to 1 would…
user1416658
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Having Trouble Identifying TCP Congestion Control Provider option: Default

I am running a Windows 10 (Version 1909) OS and when I am entering the following command in CMD ... netsh interface tcp show global ...I am able to see add-on congestion control provider set to "Default" I would like to know what do you mean by…
DeathS7roke
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http timeout with docker bridge network, but port 80 is opened in firewall

I'm trying to install mailcow-dockerized in my server, but I'm having trouble with Docker network. I tried several ways, but I get lots of connection timeouts in containers. In order to breakdown the issue, I decided to leave Mailcow behind and…
marcofons
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APIPA ARP requests are send all over the network

We have ~200 hosts running windows 10 and ~40 ip cameras all working with ip addresses from 10.100.0.0/16 almost all of them sending arp requests to 169.254.0.0/16. We have also virtual machines running on VMWare equipment and some of them are also…
v.doro2
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Routing Issue: Cannot reach target server from local network

1. my setup: I've got an optical fibre ZTE router from my ISP for internet and telephone. My old analog phone is connected directly to the router using the dedicated phone port on my router. (For illustration I draw a network diagram down below.) 2.…
hans2020dieter
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HA Proxy TCP Content Rejection

I am looking for an option or a work around where I can accept or reject the TCP Content based on the the size of a file which is getting uploaded This settings is required on TCP IP layer only also we have tried options like req_len(not working),…
Suketu Shah
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How to forward client ip to App server via Haproxy TCP/IP loadbalancer?

I have configured HAproxy for TCP/IP loadbalancing but in app server I am not getting IP address of source instead of that I'm getting haproxy IP address as client ip address. I searched on google and I got so many article to setup proxy-forwarding…
John The Hacker
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TCP/IP: can i REMOTELY (via VPN) access mis-addressed device on remote LAN?

i sent a pre-configured box to client to drop onto their LAN. while i was sure i left it as DHCP, when i connect to the LAN through the VPN i'm not seeing it pull an address from the router and it isn't showing up on the ARP tables. sooo... maybe…
WhiteRau
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Linux TCP stack does not send a RST after giving up on retransmissions

Several sources (one being my colleague and the other being TCP/IP Illustrated by Stevens) indicate that there should be a RST sent after the TCP retransmission attempts have been exhausted. I have not been able to find something that would mandate…
Zvej
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Login attempts from 255 IP? (3.0.115.255)

today I see some login attempts from an unusual IP: 3.0.115.255 and I ask myself: how can this happen, that an IP ends with 255? I thought it's for broadcasting - can it be assigned to a single machine? Greetings mathse
mathse
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What would be the possible reason for server not send syn/ack pack for specific IP address?

we have a server that do not respond to a specific internet IP address. We have looked into firewalls but no obvious setting showing block the IP. From wireshark, we found that the server received syn package, but do not send back syn/ack…
Shore
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