Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

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.

0
votes
2answers
26 views

Exploring TCP/IP Communications

According to the Lab, "The ping fails because the IP address assigned to the switch is not on the same subnet as the IP address assigned to the workstation. Even though they are on the same network ...
-1
votes
0answers
16 views

Steel Series Engine Not Working

2019-01-19T06:34:58.403Z: Encountered error during sockets.retryConnection (ws://default@127.0.0.1:50813/sock) 2019-01-19T06:36:51.929Z: Encountered error during sockets.retryConnection (ws://...
0
votes
0answers
32 views

Windows ignores ICMP:Destination Unreachable

There are sites whose firewalls reject forbidden tcp connections with ICMP:Destination Unreachable. If I try to connect from a Linux box, it fails immediately: # this is a real site $ exec 4>/dev/...
0
votes
0answers
29 views

HTTP POST a print job to a print server

I'm im web development, not network systems, so excuse any misused terminology I'm using. tldr: how do I connect a usb printer with no integrated print server to a network with a usb print server and ...
1
vote
1answer
163 views

Windows 7 NTLM not authenticating properly with Ubuntu 18.04

I've spent most of my day today trying to figure this out... Not exactly what I had in mind for today... but I couldn't help myself... So, here's the problem: My Windows 7 machine won't authenticate (...
0
votes
1answer
74 views

What if 2 session layers generate the same source port?

Is it possible for an application's session layer function to produce a source port which is already being used by another application for a current TCP connection? How are these kept unique? The only ...
3
votes
2answers
628 views

Why “Connection-specific DNS Suffix” is only (default) available for wired connection, not for wireless

I understand what and how to set "Connection-specific DNS suffix", and I mostly understand the purpose. My question is just about why only certain network connection/adapter has it by default (even ...
1
vote
0answers
88 views

Export Chrome Net-Internals Events

Are there any options for exporting data captured within Chrome's net-internals tool (chrome://net-internals/)? The only data that I care about are get requests for JavaScript files from a specific ...
0
votes
0answers
33 views

I don't get a ping response from an iPhone after some inactivity

I am on the same LAN segment as an iPhone. When the iPhone is active, I can ping (ICMP) its IP address and get a response. After the iPhone is inactive for some time, ping gets a Request timed out. ...
0
votes
1answer
73 views

Wifi-Lan Port blocking

I'm writing a paired (windows) server and (android) client application suite that uses TCP connections over wifi on a funny port number. The Server advertises its availability using Bonjour/Zeroconf. ...
2
votes
1answer
224 views

OpenWRT noack and mcs rate

Are different MCS rates supported when you are running in noack mode? Context: I am using ath9k modems+Compex WPQ864 (linux-ipq864) boards. I have configured one of the boards as Access point and ...
0
votes
1answer
162 views

Practical (vs theoretical) max limit of TCP packet size

I'm a web developer who is pretty new to the industry. I was presented with a coding challenge for a job interview where I need to design a messaging system and architect a system for how it deals ...
3
votes
1answer
156 views

How can Ping not use a transport protocol?

I just learned that Ping uses ICMP directly, i.e. it bypasses the transport layer. How is that possible? Shouldn't an application (L5) use UDP or TCP in the transport layer (L4)? The way I know it is ...
0
votes
2answers
150 views

What is the reassembly path of a HTTP response?

I am trying to understand how operating systems generally implement reassembly of network requests. From my best understanding the following is true: A HTTP request is made at the application layer ...
2
votes
1answer
943 views

How to make `nc` listen on a port without setting `SO_REUSEPORT`

I want to have a nc command listen on a TCP port so I did: nc -lv 8888 Then in another console I checked if another program trying to listen on the same port would get an Address already in use type ...
0
votes
2answers
562 views

Double NAT MTU setting for the inner network

I have a home network with two routers, one behind another. The outer router's WAN port is a VDSL2 PPPoE connection with a live IP address and the MTU size of 1492. The inner router's WAN port is ...
0
votes
0answers
54 views

UDP server socket does not get packets but Wireshark does

I have a server on pc with address 192.168.1.3, and a client socket bound with address in different subnet 192.68.0.1. The client and the server are connected via a switch. From Wireshark, I could ...
0
votes
1answer
101 views

tcp session - http request [ x out of y] in wireshark capture

As below, i am seeing this [HTTP request 1/2] and [HTTP request 2/2] in 2 separate payload, are they separate GET request in a single tcp session or are they the same GET request ??? ==== Added full ...
0
votes
1answer
901 views

Windows 10 LAN or WiFi networking gets 169.xxx address on DHCP or static

Surface Pro 4. Windows 10 1709 16299.251 Looking at the above device for a friend. When connecting to network on WiFi it asks for key instantly, and when type in, attempts to connect and then comes ...
1
vote
0answers
51 views

RST hijacking good ACK number

I'm trying to perform a RST hijacking sur on my Virtual Machine. I have 3 Vm's: -attack : 172.10.10.11 -victim : 172.10.10.21 -pirate : 172.10.10.31 First, I connect from attack with telnet to the ...
0
votes
1answer
71 views

Why default route is required to access inbound ports

I have this network configuration: - Local router 10.0.0.1, public IP 1.2.3.4 forwarding port 1002 to 10.0.0.2 forwarding port 1003 to 10.0.0.3 - Local host 10.0.0.2, server on port 1002, no ...
-1
votes
3answers
43 views

What protocol is used to reliably transmit a word document from your computer to someone else? [closed]

Answer is TCP but i thought it should be SMTP. I am confuse
0
votes
1answer
35 views

How to track all successful & unsuccessful connections an application makes?

I am running Windows 7. How can I track and record all URLs a specific process is attempting to connect to, and report successes or failures (and a timestamp for each try)? FAIL means the process ...
1
vote
2answers
202 views

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 ...
0
votes
0answers
35 views

404 for new router from a specific device

I just swapped my old home router for a Netgear AC1600 (UK). I'm writing this on a Surface Book that's connected to the new router via a Surface Hub. So, the internet connection is good but when I try ...
0
votes
1answer
53 views

Talking to Unknown IP device

I want to communicate with time attendance device for reading stored time and have the following concerns: Is there any workaround to discover connection port or type? Is there any specific ...
0
votes
1answer
21 views

identify individual devices from aggregate traffic of router

Is it possible and if yes how to identify individual devices (laptop vs. mobile phone vs TV) when listening to the aggregate traffic of a wifi router? Assumption: all devices of interest are ...
1
vote
1answer
48 views

Subnetting and node isolation

I'd just like to ask about networking... I'm a total novice to networking so I'm sorry if this isn't possible but I think it is. I have 2 Sky SR101 routers. One is connected to the modem and ...
0
votes
1answer
73 views

How does an internet server respond to a request from a private IP?

I'm learning about private/public IPs, port forwarding and NAT, and still fail to see the answer to a simple question: Suppose two users on the same network are communicating with a single server ...
2
votes
2answers
1k views

Forcing Ping to Egress When Destination Interface is Local (Debian)

I am running a Debian-based Linux container under Proxmox 4.4. This host has five network interfaces (though only two come into play in the problem I'm having). While I am shelled into this host, I ...
1
vote
0answers
346 views

Windows 10 Home remote TCP connection

The question may sound obvious, but I cannot connect to open TCP port on Windows 10 Home on my home network. My devices: PC1 - Windows 10 Home (with Ubuntu 14 installed as a second OS) PC2 - ...
0
votes
1answer
334 views

adding local printer via creating standard TCP/IP port vs adding network printer

My question is that what is the difference between adding local printer by creating standard TCP/IP port wizard and adding network printer wizard under device and printers in control panel? It is ...
1
vote
1answer
12k views

Why am I getting “No route to host”?

andrew-mx-02.andrew.cmu.edu is an MTA. It is unlikely to have a web server running. I telnet to this host on port 25 and I get the mail server's response. On an Ubuntu or Debian machine, when I ...
1
vote
2answers
197 views

Can I force IP packets to be transported over a “loopback” connection on the same machine?

My following question is on a very beginners level and I might lack significant knowledge about network basics. Although the question is somehow related to server/client concepts, the main issue ...
3
votes
0answers
133 views

Inactive / Unknown TCP connections

I can see the following TCP connections in one of my linux host. root@odb-us:~# netstat -a | grep ESTAB | grep 10.12 tcp 0 0 odb-us.:2424 10.12.0.77:40000 ESTABLISHED tcp 0 ...
1
vote
0answers
128 views

Local Area Connection Properties glitch or corrupt

I'm hoping someone will recognize what went wrong here in the picture provided. Everything seems to be working fine just the names are corrupted. I also scanned the computer with Malwarebytes and have ...
1
vote
1answer
79 views

What is/was lingerd? How it exactly worked?

I checked one very old Apache/PHP presentation. Presentation was outdated, but most of the things were very good. On one of the slides they mentioned lingerd - "properly close connections bla bla". ...
0
votes
3answers
509 views

Catch packet loss without using ICMP in FreeBSD

Is it possible somehow to detect packet loss without using ICMP protocol (ping; fping etc) to avoid generation of additional network traffic by using default utils like netstat etc?
-1
votes
1answer
465 views

What is the “24” in 255.255.0.0/24? [duplicate]

As per title, bit also what do different numbers mean? I don't know what the name is of that number - feel free to improve the title.
5
votes
1answer
1k views

Connection with a FTP server hangs (never ends) when retrieving more than one network packet

I have a problem with an FTP server (ftp.cluster003.ovh.net), specifically happening when I connect to it from home (whatever the client, computer or OS). The problem does not show up when I connect ...
0
votes
1answer
82 views

Is it possible to have multiple repeaters in a network with just 1 uniform SSID? Revision

In regards to Is it possible to have multiple repeaters in a network with just 1 uniform SSID?, would you happen to have a diagram or possibly more information that has progressed or revolutionized ...
0
votes
2answers
46 views

When a host needs to send packets to another host within the same network

Does the data still go through the gateway (router), or can the data be sent directly, and therefore the gateway is not used?
4
votes
1answer
2k views

What is the default range of Ephemeral Ports in Windows 7?

I used the following command to get the Ephemeral Ports range in Windows 7: netsh int ipv4 show dynamicport tcp And the result was the following: Protocol tcp Dynamic Port Range --------------------...
1
vote
1answer
390 views

What happens if all of the Ephemeral Ports are used in Windows?

If all of the Ephemeral Ports are used, and another socket tried to connect to a server, will the connection fail? or will the socket be assigned a port outside the range of the Ephemeral Ports?
0
votes
1answer
7k views

Access Point mode in USB WiFi adapters in Windows

Some USB Adapters, for example, many of the chips such as RTL8191SU, have option to set mode to either Station, or Access Point, or Soft AP. In Station Mode, it acts just as a WiFi client. In ...
1
vote
0answers
783 views

Windows: ipv6 version of “netsh int ipv4 install”

I need to reinstall TCP/IP V6 protocols on my Windows 10 64 bit PC. I know I can do this for TCP/IP V4 using netsh int ipv4 install in an elevated cmd prompt. When I run netsh int ipv6 install I ...
-1
votes
2answers
521 views

Why does a USB Adapter set to monitor mode on Linux not capture non-WiFi traffic send on the same frequency (2.4GHz) as WiFi ?

I have a WiFi Adapter from Alfa that can function in Monitor mode on Linux. Once I set it up and run Wireshark, I am able to see traffic across other routers and devices. If there is a new protocol ...
0
votes
0answers
176 views

Name the scope and what layer of the tcp/ip model the following address belong to

For the following addresses, 136.206.11.5 0C:5F:56:C0:DD:08 PORT 80 These are the questions: What is the scope(LAN,internet, machine)? What layer of the TCP/IP 4 layer is the model is involved? ...
1
vote
4answers
20k views

What layer of the TCP/IP do MAC addresses and IP addresses belong to?

Can anyone also tell me why we have 2 layered models(OSI AND TCP/IP)? Just having a bit of trouble with the question above. Can anyone kindly help?
1
vote
1answer
80 views

are TCP connections made while typing the URL

Do browsers make TCP connections while typing the URL in address bar? I launched nettop utility, and was surprised of how active my connections are, even while only typing an address and not visiting ...