Questions tagged [tcpip]
Transmission Control Protocol (TCP) and Internet Protocol (IP) provide end-to-end connectivity specifying how data should be formatted, addressed, transmitted, routed and received at the destination.
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How to switch between DNS suffixes using CMD (netshell)?
at my job, I have to manually switch between:
1) append primary and connection specific DNS suffixes and
2) Append parent suffixes of the primary DNS suffix
a bunch of times per day (due to a ...
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Tunneling all TCP/UDP traffic through one port
My PC doesn't have a public IP, so I want to use a VPN with support for port forwarding for the following applications:
Remote access software
Home Assistant
SSH
LM Studio
A1111 (gradio)
... and ...
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PostgreSQL traffic analysis - Wireshark - how many bytes in total are being received by the client?
<TL;DR>
How many bytes are being received in total when a SELECT * command is issued for a (small) table?
</TL;DR>
I have a PostgreSQL table - very simple (see fiddle here):
CREATE TABLE ...
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Python: TCP/IP Socket Client, how to send login packet?
I wanted to create a bot to send login/join packets to a game server. So it will join then send more packets for it to write something in the chat, but I'm not sure how to do this. If someone could ...
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Does the TCP/IP model have 4 or 5 layers?
In some sites , It is given that the TCP/IP model have 4 layers; network access, internet, transport and application.
But in other references , the model is shown to have 5 layers (instead of network ...
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What does it mean to have a subnet mask /32?
I see in this question, the routing table has:
192.168.1.1/32 link#4 UCS 2 0 en0
openwrt.lan 46:94:fc:63:fc:7 UHLWIir 11 3610 en0 1200
...
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Why are home networks prefixed with 192.168?
Why are home networks prefixed with 192.168 ?
Why those numbers?
For some historical reasons?
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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.
...
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Is there a way to setup manual TCP/IP configuration on MacOS only for specific networks?
I need to have a static IP address only when I connect to the network generated by a custom device that I have. Is there a way to do this operation automatically without having to type IP, gateway and ...
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Windows 11 network settings keep changing to static IP with blank configuration
Dell XPS 15 9510
Windows 22H2 (22621.1485).
This problem has persisted through multiple Windows 11 updates and multiple Dell driver updates.
About half the time when I boot my laptop up at work, the ...
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Send TCP with incorrect checksums
I'm having trouble sending large files to an OpenStack machine.
Our Internet connection is over LTE so bad packets are to be expected. However, even sending data over TCP results in corrupted data ...
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Defining Inbound and Oubound Policies in Windows Firewall,AV Firewall
In Windows Firewall we define Inbound & Outbound Policies for Web, Network, etc. access as we have separate settings for the same...The same if taken in an AV Firewall for example in Quick Heal ...
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How many TCP retransmissions Internet traffic is considered normal for a basic home setup?
Out of curiosity, I connected my laptop with an ethernet cable to the router and fired up Wireshark to understand and 'visualize' what's going on.
Some packets caught my attention.
I was having some ...
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Connection to website fails
I am trying to connect to a website. From my laptop, located in my WLAN, it doesn't work:
joesse@laptop~> ping -c 1 www.ttrss.info
PING www.ttrss.info(vps-4c11fdd7.vps.ovh.net (2001:41d0:304:200::...
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Low Windows bandwidth in google cloud platform
I have an on-premise site with mainly Windows resources and an up-to-date Forti firewall as the central communication device. This site is connected through a partner interconnect created according to ...
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Why has Microsoft never implemented a loopback interface in Windows?
First things first: I know that you can install a sort-of-a Loopback Adapter in Windows.
But what I really found strange is that there exists nothing like lo on Windows. At all. From The missing ...
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How to kill a particular tcp connection in windows?
On Linux we can kill an Established TCP Connection using tcpkill command.
For example, to drop all connection to/from a particular IP:
tcpkill host ipaddr
Or similary to kill all connection ...
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I am not able to send an audio or video file in chat software (such as WhatsApp, etc.)
My question is about data transfer on the Internet...
What is the difference between split packets by open-source software and TCP/IP structure on the internet for split(MTU fragmentation and sequence ...
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What Layer of the OSI model would a hotspot operate on?
What layer of the OSI model would a hotspot operate on? I am seeing conflicting information, and I am unsure which is correct now. I have seen both Data Link layer as well as Physical layer, and I ...
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How to connect to HW device on IP address ending with .255?
I have HW device with web settings interface (similar principle like router, but it isn't router) and I changed the IP address of the device to .255.
I know it is an broadcast address now and I'm ...
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How are IP addresses and port numbers encapsulated down the TCP/IP stack?
This apparently senseless question keeps spinning in my head. I probably wrongly assumed that the Layer 7 headers for different protocols included the source and destination IP addresses and port ...
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Torrenting now fails in Windows 10
qbitTorrent stopped working in Windows 10, so I uninstalled it, and replaced it with Deluge.
64-bit Deluge fails with
"Unhandled exception in script
Failed to execute script 'deluge-script' due ...
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How to resolve VLAN tagging issues with Google Nest WiFi router
I am a software engineer and have some training and experience with TCP/IP networks, but not enough to figure out this intractable issue that appears to be caused by my choice of router colliding with ...
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ICMP 3 / 3 if a port is unreachable
When I want to connect to a non-opened port of my Linux-PC from my Windows PC my IP-stack runs into a timeout after some seconds. So what's happening here ? Does my Windows PC not evaluate any ICMP ...
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How do I stop TCP reset packets?
Full story: This has been quite the odyssee, finding out who is sending these TCP reset packets. The isp pointed me in the direction of the minecraft server, the minecraft server said it has to be the ...
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Is there any SMS/MMS server for LAN environment
I am looking for a solution to send SMS/MMS message to mobile device from desktop or browser in LAN environment. As such, it is most probably using TCP/IP protocol to transmit request/response.
The ...
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User defined mapping hostname-to-address without root privileges
Is it possible to define a mapping hostname to IP address in Linux without root access (ie modify /etc/hosts) nor a DNS server ?
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Why don't we have a usable IP address in 127.0.0.0?
From theory, each part of an IP address is a number between 0 to 255 (256 usable slots in total).
But why is 0 not used in any IP addresses in their 4th part and they always start from 1 in IP ...
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How do computers know how to use TCP
I'm asking from a Windows perspective but any perspective is great.
Are NICs all a computer needs to interface with TCP? Wouldn't they also need some sort of software associated with TCP, or is that ...
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how to change my IP address to another country? [duplicate]
I need to access that website which is allowed to be accessed from Syria.
I have tried to change my IP address to make my device as Syrian device. however my attempt went wrong.
here are my steps:
I ...
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Is there a hard limit of 65536 open TCP connections per IP address on linux?
Is there a hard limit of 65536 open TCP connections per IP address on linux?
I read somewhere that there was, but someone is asking for confirmation and i just can't find it.
I seem to remember it ...
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How to find the MAC address of a remote computer?
I know the IP address of a host on my own LAN. Using that, how can I find its MAC address (without having to physically access it)?
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Why does Windows resolve all IPs of all NICs with the hostname?
I´m having diferents problems with TCP/IP aplications that works through HOSTNAME. The Server where this aplications are installed(WIN Server 2012) have 4 NICs and Windows,resolve his own hostname ...
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VM can access internet despite iptables DROP rules
I have installed VirtualBox and I have 2 Ubuntu VMs running on VirtualBox. Please see the network diagram:
VM 1 (Client VM) has static IP address of 10.0.2.2. Gateway VM has 2 IP addresses - 10.0.2.1 ...
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How can I restore default settings and metrics in Windows Server 2019?
I have a Server 2019. With RAS installed and I have three NICs. I played around with the standard gateways to connect an IIS to the second NIC. Now I want to reset all routing and metric changes to ...
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A Dos attack possibilty using IP Datagram and TTL
So I recently learned about the whole IP Datagram and its headers. We learned about the TTL field that exists because sometimes a packet from a certain network id will be sent to another router, but ...
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Unable to connect Android ADB over TCP/IP
I tried to connect to my phone through WiFi using Android ADB, but I can't connect it.
I tried this steps:
adb kill-server
adb tcpip 5555
adb connect 192.168.1.16:5555
And got this message:
...
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network bridge query with hamachi?
I have an embedded hardware in one city connected with my mac laptop via ethernet.
I wish to connect that hardware to the server in a different city. The server is not on the internet but I have a ...
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How do I see which processes have open TCP/IP ports in Mac OS X?
How do I see which processes have open TCP/IP ports in Mac OS X?
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Address of a Transport layer?
In TCP/IP protocol stack following protocol level addresses exists:
Data Link layer - MAC address
Network layer - IP address
Transport layer - ?
Application layer - Socket address which is ...
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MAC address in TCP Header - HTTP Request?
In the same below, why are there MAC addresses in the respected request packets? Why and how did the client obtain the destination MAC address?
At first I thought it was the router, but can this ...
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How to reset Host Only Adapter Networking for Oracle VirtualBox VM Manager
My Host Only Networking stopped working, how do I reset it ?
I tried disabling and re-enabling Local Area Connection and VirtualBox Host-Only Network but VirtualBox Host-Only Network is still ...
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Scenario where DHCP static lease AND static IP (both with same IP) on same machine?
OK the obvious answer is that "this is stupid", but please read the scenario.
Let say, we have a very sensitive piece of equipment (like an alarm system), that we want to eliminate as many ...
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TCP header option: SACK-permitted (Selective Acknowledgments) negotiation
I'm doing a research project, which needs to split tcp connection.
so I have some pecular questions, which may happen in my development.
The problem is understanding of TCP SACK-permitted negotiation....
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is "Empty reply from server" a deliberate reply, or a default one from the TCP/IP stack?
I have a device whose port 80 is open and I was wondering what is behind:
~ # curl -v http://192.168.10.253 root@srv
* ...
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What are CLOSE_WAIT and TIME_WAIT states?
When I do netstat -a on my Windows machine, I get a listing of the ports with one of the four states:
- LISTENING
- CLOSE_WAIT
- TIME_WAIT
- ESTABLISHED
What do CLOSE_WAIT and TIME_WAIT mean/...
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What is a (sub)network in the context of TCP/IP stack?
In the context of TCP/IP stack (that is the Internet), is a (sub)network defined as IP address + mask?
If not, then how is a (sub)network defined?
Clarificaltion:
Given a complex interconnection of ...
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Tampering TCP data on a Windows application
Is there an application where I can run another application and it will allow me to see and more important manipulate the TCP data sent to another server?
I'm using Wireshark to view the data, but I ...
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Is your MAC address revealed when you hit up a website?
When you hit up a site, such as cnn.com, does the TCP/IP packet contain the MAC address of your network card?
Could cnn.com theoretically record my MAC address?
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How to diagnose issue with browsing websites?
I've had an issue with my PC which started yesterday.
After reboot it works fine for about 10 minutes, then i'm unable to browse any websites from Firefox, Chrome or Edge. Rebooting again fixes it for ...
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