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0
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69
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How to prevent resource leaks in Go (based on given TCP connection example)? [closed]
I've been playing with a very simple TCP server in golang (net.Listener + net.Conn). Within my code I open a TCP connection and pass it to a goroutine to read data from it. In that goroutine, I think, ...
-1
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0
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70
views
TcpStream 'misses' packets if it is not polled frequently enough [closed]
I have been facing an issue in Rust with processing TCP packets from a system in Bevy (a game engine based on an entity component system).
The TCP packets in a TcpStream (but NOT in a TcpListener) ...
2
votes
1
answer
62
views
Handshake fails with RST after destination address modification of TCP packets in Netfilter hooks
I am implementing a destination NAT-like behavior by hooking into NF_INET_PRE_ROUTING and NF_INET_LOCAL_OUT to modify the destination IP address and recalculate the checksums.
nf_tracer_handler(void *...
0
votes
1
answer
43
views
tcp-scanning using TCP SYN and having OSError: [WinError 10022] An invalid argument was supplied
i got a task that asks to make a tcp-scanner using method TCP SYN,
from scapy.all import *
from scapy.layers.inet import IP, UDP, ICMP, TCP
def tcp_scan(destination_ip : str, ports : list[int]):
...
0
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0
answers
67
views
Socket TCP connection through Radmin (can't connect) in Console Application
I made a simple console messenger to test the possibility of connecting 2 or more computers for my game using RadminVpn+Sockets but its not working. I can connect to myself using my radmin ip but if I ...
2
votes
1
answer
130
views
Received request message is changed from TCP server after upgrading Spring boot to 3.4.2
After upgrading Spring Boot from 2.7 to 3.4, receiving message from TCP server to our service is getting changed with different code. For example, previously the received message is 1784 after ...
0
votes
0
answers
111
views
Unsubscribe from topic not working when using persistent session Mqtt
I have a Qt application that uses the qtmqtt module to implement a simple MQTT setup.
I’m running two instances — one as a subscriber and one as a publisher.
In the app, users can right-click on any ...
0
votes
1
answer
116
views
MQTT subscriber doesn’t receive queued messages when publisher uses QoS 0?
I’ve been reading the MQTT documentation, and as I understand it, there are two types of Quality of Service (QoS) levels involved:
Publisher QoS: determines the delivery guarantee between the ...
-1
votes
1
answer
87
views
Seastar: per-shard TCP listeners not binding or exiting silently on non-0 shards
I’m trying to start a per-shard TCP listener in Seastar, where each shard binds to its own port (6010 + shard_id). On shard 0, everything works — the listener binds and accepts connections fine. But ...
0
votes
0
answers
92
views
MQL5 SocketConnect fails with error 4014 connecting to local TCP server
I’m developing an MQL5 Expert Advisor that should connect to a local TCP server (127.0.0.1:5001).
The server is running and responds correctly to Telnet.
In MetaTrader, I added 127.0.0.1:5001 in ...
-4
votes
1
answer
54
views
Can we attach a ebpf program after tcp reordering? What mechanism should we use any ready examples folks?
Can we attach a ebpf program after tcp reordering? What mechanism should we use any ready examples folks?
We tried at tc level but see problems of packets not being ordered/assembled as expected!
...
1
vote
1
answer
84
views
Why does the NetworkStream.ReadAsync call end the loop
I have a Task that should continuously read from a Tcp stream and place the data into a ConcurrentQueue for processing. Stepping through the function I notice that the ReadAsync Call does not return.
...
0
votes
0
answers
80
views
Run Pyshark on TCP Port interface?
In order to get the data I need from Tshark I run with the flags:
tshark -i [email protected]:11111 -T ek
and we are streaming data to the TCP port 11111.
I'm trying to recreate this with pyshark:
...
1
vote
2
answers
159
views
TCP Connection Refused Given multiple concurrent connection
I try to play with multiple concurrent tcp connection in Java.
Given 250 concurrent tcp connection, some of them will get connection refused.
It surprises me due to only 250 connection.
In large web ...
0
votes
1
answer
131
views
How can I handle multiple TCP clients concurrently in Node.js without blocking others?
I'm trying to build a lightweight TCP server in Node.js that can handle multiple clients concurrently without blocking any of them — and all of this in a single-threaded manner, staying true to Node....