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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Why TCP connection disconnected?
I have two hosts: a client and a server. The client is syncing data to another; it suddenly has an error: java.net.SocketTimeoutException: timeout. It seems like a read timeout. Client config:
return ...
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Can TCP Packets Be Spoofed? How to handle fake SYN requests / identify who is responsible for these packets?
Long story short, my server's system load is off the charts, but nothing is taxing the CPU script or program wise. It appears that it is under a TCP Syn flood attack, but I cannot figure out how to ...
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DNS re-resolution and failover of TCP connections
I manage some stateless services that work over TCP, and we are working to ensure reliability and recoverability in case of a regional outage. I find that I lack enough understanding about the ...
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Linux automatically timeouts incoming connections just after accepting
We have a dedicated server that works fine and accepts incoming connections fine.
it receives and sends data fine as well.
Works great for some hours, but after that all accepted connections ...
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Apisix kubernetes Discovery not work
I am using official helm chart to install the APISIX in my Kubernetes.
I only override the following values from the official helm chart:
useDaemonSet-> true
serviceAccount -> set create to ...
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Fortigate 40F syslog over TCP not working, but UDP works
Trying to send syslog over TCP from Fortigate 40F does not work, but it works over UDP.
The config for the syslogd settings are:
config log syslogd setting
set status enable
set server "...
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Why would a server not send ACK in response to PSH, ACK?
We have a client/server implementation, where the client continuously, periodically sends data at 800Hz over ethernet. The packets are small so we're significantly under the network bandwidth limit.
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The TCP connection is always reset while transmitting a 6M file
I have a web server, which allows user to upload or download files through HTTP requests.
Internet Internet loopback interface LAN
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TCP source port sharing
My understanding of TCP connection is that a source PORT remains exclusive to one connection, no matter the destination is, so the number of connections from local port 12345 for example can never ...
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Linux Kernel keeps retransmitting data already ACKed by peer
I have the strange issue that a session without obvious cause hangs and timeouts. The session is a syslog stream with rather high volume, and traffic only flows from client to server. In capture files ...
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TCP stream ends with retransmission of last FIN,ACK packet
The TCP network connection between an Haproxy server in TCP mode (.94) and Postfix (.137) randomly ends with the retransmission of last FIN,ACK packet from the Postfix server:
It only happens for ...
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TCP CWND and RWND Mismatch
currently I am doing some Measurements (using iperf3, TCP-Tracepoints (for monitoring the Congestion-Window (CWND)) and tcpdump).
While altering the TCP-Window (RWND) Field (using a nf-hook kernel ...
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SCP Transfer Interrupted with 'Broken Pipe Client Disconnect' Error - Self-Developed Modems"
I'm encountering an issue with SCP transfers between two systems connected via self-developed modems. When attempting to transfer a large file(around 7GB), the transfer starts successfully but ...
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Can I make TCP_NODELAY a default setting for all connections on a GNU/Linux system?
This article:
It’s always TCP_NODELAY. Every damn time.
suggests, as a bottom line, to set TCP_NODELAY by default, always. Can I do that on a (recent) GNU/Linux system...
As root, for all sockets ...
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What factors determine the TCP window size?
We have a network throughput issue, but cannot find a bottleneck. We have spent four weeks looking at router logs, FW logs, and monitoring and we are now looking into the TCP window size on client.
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