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.
390
questions
0
votes
1
answer
19
views
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 ...
1
vote
0
answers
115
views
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 ...
- 1,868
9
votes
2
answers
2k
views
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 ...
- 91
1
vote
1
answer
35
views
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::...
- 11
1
vote
1
answer
37
views
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 ...
0
votes
1
answer
35
views
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 ...
0
votes
1
answer
27
views
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 ...
- 737
0
votes
0
answers
332
views
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 ...
- 9,424
0
votes
0
answers
121
views
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 ...
- 543
0
votes
0
answers
258
views
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 ...
- 101
0
votes
0
answers
29
views
How to see the percentage of ports being used by an application compared to the total number of ports available
Having some rare port exhaustion issues and was wondering if there is a way to see the number of ports being used by a single application. I would like to have it in a percentage-like manner but ...
16
votes
6
answers
7k
views
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 ...
- 623
0
votes
0
answers
27
views
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 ...
0
votes
1
answer
142
views
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 ...
- 1
-1
votes
1
answer
172
views
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 ...
- 15
0
votes
0
answers
102
views
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 ...
- 1
0
votes
0
answers
499
views
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 ...
- 227
1
vote
2
answers
72
views
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 ...
0
votes
1
answer
146
views
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 ...
- 351
0
votes
1
answer
394
views
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 ...
- 35
2
votes
1
answer
2k
views
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 ...
- 53
0
votes
1
answer
2k
views
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 ...
- 123
1
vote
1
answer
319
views
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 ...
- 21
0
votes
1
answer
90
views
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
* ...
- 2,714
0
votes
4
answers
101
views
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 ...
- 135
1
vote
1
answer
344
views
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 ...
- 21
1
vote
1
answer
617
views
When will the router remove an entry from its NAT table?
When will the router remove an entry from its NAT (net address translation) table?
Most routers used in our homes maintain a NAT table to translate the public IP and port to the private ones. This is ...
1
vote
3
answers
188
views
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 ...
- 111
0
votes
1
answer
575
views
Connect adb wifi without using tcpip android
I am using nokia 5.1 plus amd my computer is Dell lattitude E6430 ETG model
I'm using adb wifi and running it through cmd to run my application in mobile without using cable.
I'm doing all these ...
- 101
0
votes
1
answer
2k
views
Windows 10 Data Usage Not Showing Up Properly
When I try to check my data usage in Windows 10 (ms-settings:datausage) my data usage doesn't show up. On the main screen it says 0MB. When I click "View usage by app" to get more detailed information ...
- 396
2
votes
1
answer
1k
views
Tool to send TCP RST flag
Since yesterday, we have strange traffic to our server that is causing it to consume up all memory over time. This is the pattern:
time (sec) info ...
1
vote
0
answers
52
views
How do Flow Control and Congestion control work together?
I am trying to learn about Flow Control and Congestion Control in TCP.
So far I understand that flow control uses the sliding window method and the receiver advertises a receive window based on how ...
- 13
0
votes
1
answer
45
views
How is network congestion detected in TCP?
I am trying to learn about Congestion Control in TCP and in this video (at 1:56), he says if there is no ack received, it assumes network congestion and cuts back the cwnd, no where he mentions about ...
- 115
1
vote
0
answers
5k
views
How to disable Path MTU Discovery on Windows 10
How can I disable Path MTU Discovery on Windows 10?
Following these instructions for an older Windows version, I tried adding the EnablePMTUDiscovery registry value to HKEY_LOCAL_MACHINE\SYSTEM\...
0
votes
1
answer
159
views
Is an open port on Router a threat if it's forwarded to a host which not exist
Consider we have port 65434 open on router (open for WAN). The port forwarding is done to a host which does not exist. Can a hacker exploit this open port on router which leads nowhere?
- 38
1
vote
0
answers
34
views
Will the MS Windows RDP connection be a security threat if
I have read a lot regarding this subject, but still not much is clear.
So the question is: will it be dangerous to use RDP for connections outside LAN if?:
I have a special module which have ...
- 38
3
votes
1
answer
584
views
How does port triggering know what ports to open?
Port Forwarding as I understand it
When creating a port forwarding rule, the router keeps the specified external port open at all times, and simply forwards all inbound traffic for that port to the ...
- 33
0
votes
1
answer
69
views
What is corel doing on my udp connections for Chrome?
I have a weird mc.corel.com address lingering in Chrome and some parts of svchost processes, what is going on?
0
votes
3
answers
72
views
How these two TCP and IP work together?
I am not able to understand TCP/IP model where in layer 4 it says suppose using TCP means connection is oriented and packets will follow certain path but in layer 3 it says IP is connectionless and ...
- 169
0
votes
0
answers
88
views
UDP between A and B only works if B sends packet first
I have two separate linux computers, A and B, that need to communicate via UDP on port 3000. They are each behind a different router, and I have port forwarding rules set up on each router.
For some ...
- 1
1
vote
3
answers
970
views
What if I spoof the MAC Address of a public device (such as a router)?
MAC addreess should be unique in a particular network. Manufacturers try to keep this unique, but there is no guarantee. Even we can create a virtual device using software.
My question is, what will ...
- 115
0
votes
1
answer
424
views
Router admin page not reachable through WAN port
Let us say , I have a home router which have
LAN port : 192.168.0.1
WAN port : 10.137.141.195
Now , When I do 192.1768.0.1:80 , I am able to open the admin page but when I do 10.137.141.195:80 , I ...
- 547
42
votes
6
answers
199k
views
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
...
- 547
3
votes
1
answer
583
views
Why is the local address the same as the peer one?
A weird issue occurred while I was troubleshooting with ss, the local address is exactly same as the peer one. Same IP address is ok, but how to explain the same port?
- 61
2
votes
1
answer
89
views
Client cannot receive server Retransmission on a Windows 7 client and Windows 7 server setup
I have a Windows 7 server and a Windows 7 client application where the client application sends a query to the server application and the server application would respond. An issue can occur if the ...
- 19
0
votes
0
answers
701
views
No-IP (Public IP) is painfully slow compared to direct IP address access
So I was making a software that sends screen image continuously using VB.NET (TCP) and when I type in my local IP address it sends screen image really fast but when I changed it into my public IP ...
0
votes
0
answers
97
views
Connection failed error for client connected to server over wifi (TCP socket program in c)
Requirement : Need to send and receive message from two devices connected over wifi using TCP socket programming in c.
Receiving connection failed for client socket. I am able to connect same client ...
- 1
0
votes
0
answers
2k
views
What's the fastest way to open TCP/IPv4 Properties? in Windows 10
Is there a shortcut to open TCP/IPv4 properties directly
I go this way
⊞ win+R
ncpa.cpl
Click Ethernet
Properties
Scroll down to TCP/IPv4 and click it
Too many steps
Assume it's for a PC with a ...
- 103
1
vote
0
answers
685
views
Multiple connections on same port using netconn
Trying to develop a MODBUS Slave application via STM32H743BI using LwIP 2.0.3 and FreeRTOS 9.0.0
My app should be able to handle multiple clients simultaneously. I want to create seperate threads for ...
- 11
0
votes
1
answer
244
views
Is it possible to use FTP without filesystem in client?
Is it possible to use FTP protocol (not TFTP) to get file from ftp server to ftp client without using filesystem in client ?
EDIT:
The motives behind the question: I know that tftp can do it, but ...
- 261