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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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Are extra flags discarded in TCP exchanges?

A "normal" TCP handshake looks like this: MachineA → SYN → MachineB Machine B → SYN,ACK → MachineA MachineA → ACK → MachineB This means that for each step, a flag (or set of flags) is ...
WoJ's user avatar
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0 votes
1 answer
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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 ...
glibg10b's user avatar
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1 vote
1 answer
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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 ...
Vérace's user avatar
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0 answers
146 views

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. ...
ekomonimo's user avatar
1 vote
1 answer
108 views

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 ...
Ale TheFe's user avatar
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0 votes
1 answer
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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 ...
CrazyFirewall's user avatar
1 vote
1 answer
4k 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 ...
THE JOATMON's user avatar
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8 votes
2 answers
4k 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 ...
Netu30's user avatar
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1 vote
1 answer
41 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::...
Joesse's user avatar
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1 vote
1 answer
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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 ...
aleksei stukov's user avatar
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1 answer
42 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 ...
hami zahedi's user avatar
0 votes
1 answer
191 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 ...
Antonio23249's user avatar
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0 answers
727 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 ...
K7AAY's user avatar
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312 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 ...
Bonita Montero's user avatar
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0 answers
635 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 ...
doej1367's user avatar
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16 votes
6 answers
8k 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 ...
Mojtaba Rezaeian's user avatar
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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 ...
devoloper's user avatar
0 votes
1 answer
200 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 ...
imgs's user avatar
  • 1
-1 votes
1 answer
492 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 ...
Meester Moo's user avatar
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0 answers
131 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 ...
suyash's user avatar
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0 votes
0 answers
851 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 ...
xMRi's user avatar
  • 247
1 vote
2 answers
111 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 ...
the cool sheep's user avatar
0 votes
1 answer
264 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 ...
thevikas's user avatar
  • 361
0 votes
1 answer
726 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 ...
AJ HUNTER's user avatar
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 ...
Usernamehere's user avatar
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 ...
Ollie C's user avatar
  • 133
1 vote
1 answer
529 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 ...
NLS's user avatar
  • 21
0 votes
1 answer
210 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 * ...
WoJ's user avatar
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0 votes
4 answers
128 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 ...
croraf's user avatar
  • 145
1 vote
1 answer
523 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 ...
AldaFalda's user avatar
2 votes
1 answer
968 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 ...
Scientific.RAT's user avatar
1 vote
3 answers
190 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 ...
Ben's user avatar
  • 111
0 votes
1 answer
974 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 ...
zinonX's user avatar
  • 101
0 votes
1 answer
3k 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 ...
user324747's user avatar
3 votes
1 answer
3k 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 ...
Evgeniy Berezovsky's user avatar
1 vote
0 answers
80 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 ...
Sally Ashton's user avatar
0 votes
1 answer
93 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 ...
akellas's user avatar
  • 135
1 vote
0 answers
7k 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\...
Danilo Piazzalunga's user avatar
0 votes
1 answer
289 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?
A.Bras's user avatar
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1 vote
0 answers
39 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 ...
A.Bras's user avatar
  • 38
3 votes
1 answer
1k 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 ...
Cyber's user avatar
  • 33
0 votes
1 answer
76 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?
somerandomguy83's user avatar
0 votes
3 answers
106 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 ...
shivaniverma6991's user avatar
0 votes
0 answers
200 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 ...
pcdangio's user avatar
  • 101
1 vote
3 answers
2k 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 ...
SRaj's user avatar
  • 115
0 votes
1 answer
640 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 ...
Number945's user avatar
  • 597
47 votes
6 answers
269k 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 ...
Number945's user avatar
  • 597
3 votes
1 answer
781 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?
choes's user avatar
  • 61
2 votes
1 answer
116 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 ...
Vincent Tang's user avatar
0 votes
0 answers
261 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 ...
APS's user avatar
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