All Questions
Tagged with tcp networking
477
questions
0
votes
3
answers
442
views
Understanding how ports work and how are they different from processes?
I've been a part of a network operations team for quite some time now and was extracting a certificate using this command:
openssl s_client -connect <IP>:<PORT> </dev/null | sed -n -e '/...
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votes
0
answers
68
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Wireshark showing packet exchanges with unconnected IPs
Running Wireshark on a PC for network monitoring and I noticed something strange. Application data is being exchanged with websites that are not open in the browser, or on any other device on the ...
- 9
1
vote
0
answers
113
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Gateway responding with ACK instead of server. Causes RST
I have a service running on my LAN which works very intermittently. It serves a webpage just fine right after I restart the server running macOS 14.1 (I noticed this happening on multiple versions of ...
- 11
1
vote
0
answers
211
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How to remove several Active Connections established by Firefox in the background to seemingly some local API server
When I checked active connection on my Windows with netstat -ab command, I found that Firefox has established several active connections to this seemingly local API. It had the name of a software ...
- 449
0
votes
3
answers
808
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What happens between a TCP handshake and HTTP CONNECT?
When you have a system making HTTPS requests through a web proxy, my understanding is that there is the TCP handshake between the client and the proxy, then the client sends a HTTP CONNECT to ...
- 11
1
vote
1
answer
589
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Retransmission of TCP packets
I have device A (10.10.25.1), which is connected to device B(10.10.25.52) via unmanaged switch. Device A is a computer. Device B is measurement instrument. Device A is continuously(every 1sec) sending ...
- 4,683
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votes
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187
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Windows can't connect more than 64k concurrency outgoing connection
I'm trying to make 100k concurrency outgoing connection from one pc to my local server.
My program can use specific ip on each connection.
Goal : 1 pc have around 100k concurrency outgoing connection.
...
0
votes
0
answers
2k
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How to enable Windows 10 TCP keepalive?
As per this answer TCP keepalive can be enabled by three registry values. However, setting KeepAliveInterval=KeepAliveInterval=30000 miliseconds and TCPMaxDataRetransmissions=5 definitely does not ...
1
vote
1
answer
2k
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Print Related Communication - RPC over TCP vs RPC over Named Pipes
In Windows 11, version 22H2. Microsoft made some changes to enhance security, one of those is the change in the communication of print related operations. Making RPC over TCP the default for client – ...
- 25
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56
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Miktrotik: disconnect TCP connection
I am working on a mobile device project. I have the mobile device connected on a local USB Wifi hotspot on an Ubuntu PC and I can WireShark the TLS connections which the mobile device creates towards ...
- 101
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votes
0
answers
74
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TCP Receiver's Window stop increasing
I'm debugging a high-bandwidth TCP connection whose throughput is significantly lower than the capability of the device and the network. The network between these 2 hosts is expected to be high ...
- 101
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0
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37
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Seeing several thousand retransmits every 10 sec. via iperf3 on TCP traffic through a propritary network bridge device
What is the most likely cause of TCP packet fastACKretransmits when testing with iperf3 on a small 5-7 node Linus AutoIP network running on a TI AM5728 board? Where and what setting should we check ...
1
vote
1
answer
3k
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UDP client to listen to a multicast group/port without setting its own IP?
I have a small microcontroller device that I program via USB using Python. The device has an Ethernet connection, which can be configured either with DHCP or by manually setting the IP/Subnet via USB. ...
- 121
5
votes
1
answer
812
views
Iptables Fail to block inbound from specific ip
Hi I Have a online server which i use like gateway and iptables is acting weird
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -i ...
- 303
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votes
0
answers
43
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Teardrop detected from TCP ACK from myself
I'm experimenting with linux (Debian 5.10) networking to allow me to connect two networks (eg. 192.168.0.0/24 with 172.17.0.0/16) together.
Setup
In my case it is a small server with one NIC, hosting ...
- 126