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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Identify the TCP/IP classes respectively by beginning octets
I am busy studying for a network exam and I am stuck with this zinger:
By studying the following beginning octets, identify the TCP/IP classes respectively
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tcp retransmission on lan, wifi is fine
I have a Dell XPS 17 laptop (about 5 years old) running Windows 7 and a Synology RS412 NAS. I also have various other networked devices (servers, routers, laptops, pcs). Some are in my domain, some ...
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Getting corrupted data from the Internet - shouldn't TCP checksums prevent this?
The last 3 days, I've been getting corrupt data when surfing and downloading from a 3G internet connection. This is easiest tested by downloading a zip file from anywhere (e.g. https://get.videolan....
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How are ports and URI schemes handled by a tcp/ip server?
I am working with the lwip tcp/ip stack on an embedded device, and I'm trying to understand how it all works. I've been looking through the documentation and code, but I'm confused by how ports and ...
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View connection messages [closed]
I'm investigating some bugs on a Android Application, that uses a Third-party plugin.
I need to view all connections messages between this plugin and a server. There is some way to list all send ...
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How do you view a printer's IP address on a school protected network?
How do you determine the ip address of a network printer whose menu options on the printer has been disabled by school admins?
Printing the configuration page does not show the TCP/IP information.
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In VMware what are the differences between the network connection options?
In VMware there are the network options
I'm unsure what to choose. I've red the documentation here but find the situations it describes are too complex with my needs. I just want the internet to ...
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Free official documentation for cables and models? [closed]
I've been looking through the ISO and IEEE sites for official documentation on the Open Systems Interconnection (OSI) model, TCP, and a range of cable standards (5/5e/6). However, other than on the ...
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Disabling "Use default gateway" on TCP/IPv4 kills the VPN connection
My work network requires you to disable the default gateway to use home directories etc. remotely. However, disabling the default gateway disables the VPN connection. Any solutions?
Thanks.
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Source Address / Source Port vs Destination Address / Destination Port
I am new to TCP/IP and trying hard to learn basics. Well, I really wonder about inbound rules and outbound rules of firewall and concept of source address port, destination address port.
For example, ...
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VMware Workstation isolating guest to a separate internet
I have N1 and N2 network. The host has two ethernet adapters E1 and E2. The host is connected to N1 through E1, but I want to connect a guest to N2, and I do not want N2 to affect the host by any ...
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BOOTP packets blocked while DHCP packets are accepted
We have an IP system that makes use of BOOTP for updating our embedded devices over IP. The main app uses DHCP for its IP configuration.
Our devices are usually on the network of the customer, the ...
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Virtual machines using wrong IP addresses
I have a host computer (A), running three virtual machines: X,Y and Z.
They're under a NAT layer, in which the Host A is the gateway (192.168.0.1/16), and the VM's are respectively 192.168.0.2 (X), 0....
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How to say windows not to use specific network connection for Internet traffic? [duplicate]
I have slow VPN connection to another computer, which is also connected to internet as my computer is.
When this connection is active, all browsing traffic goes via remote computer, although it is ...
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How to make my computer think an IP is somewhere else
I have a local app which code I do not own and tries to directly connect to some IP, let's say 123.45.67.890. For testing purposes, I would like to re-route that connection to somewhere else, another ...
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How to configure the physical machine and virtual machine?
If I want to transfer data between the physical machine (windows operating system) and virtual machine (Linux real time operating system). Could anyone please explain about configuring the data ...
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How does an ADSL modem tell which local client to associate with each response from a server?
Does an ADSL modem generate a random string for each request I make and when response comes it directs it to my computer (but not to my phone)?
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Configuring an experimental TCP/IP computer network using a virtual machine
I don't have extensive experience to computer networks and I would like to practice using a Linux distribution and virtual machines like virtualbox or vmware.
I imagine a host Ubuntu/Linux PC and a ...
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How to monitor TCP and UDP port changes
I am running software on a server that may be turning off some ports and need to find out what it is. I have the ports I need to check. I just need to find out what is turning them off. How can I ...
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Firewall between Client and Server - Which ports do you open?
I want to know the following: (exam type question)
When you have a client-server system, that uses uncommon ports (e.g. in range 48000 - 49000), and you have a firewall between the client and the ...
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How to mitigate BufferBloat on an ADSL connection?
I've had interesting networking experience before. Before I moved, I've had a VDSL connection, with 3mb uplink. (The down speed was around 30mb but is not relevant at this moment). Whenever I ...
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Getting Correct IPv6 Address from given prefix
On my windows xp machine, i have this information:
IP Address: fcb1:cafe:1:9e33::2
Default Gateway: fcb1:cafe:1:9e33::1
It works fine, and i can ping the gateway. However now there is another ...
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Occasionally unable to connect to single web page
Occasionally, one of my users will be unable to connect to our web-based email (simple timeout, page cannot be displayed, errors). The problem persists for days (and between reboots) then eventually ...
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Is it technically incorrect to claim that a TCP/IP connection was established with an IP address?
In the case where an IP address is assigned to a cable modem and utilized by computers on the home network through a router connected to that cable modem, is it technically incorrect to claim that a ...
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Connect to site with IP but showing as URL
I think this may not be possible because of the way the TCP/IP protocol defines packets, but I figured I'd ask.
Some sites, such as those on shared servers, use the same IP and the server delivers ...
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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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Is it possible to have a Linux box with 2 Ethernet adapters, connected to 2 networks with same IP range (no routing needed)?
Bear with me. This relates to this Stack Overflow question.
My Linux thing (actually a BeagleBoard) has two interfaces, eth0 and eth1. It needs to connect to a client's network on eth0 (address ...
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Network switch losing TCP packets between devices and a PC
I have a custom AVR microcontroller board that has a TCP/IP module (chip) for communication with PCs.
My PC has a 4-port Gigabit Ethernet card. Each port is connected to an Ethernet switch HP 1410-...
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Printing Over the Internet
I would like to know how to allow certain people, with unique user names, to be able to log in over the internet (not LAN) and be able to print their documents to my printer, which is connected to my ...
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Allow all inbound traffic from specific IP addresses
I am running one of our server applications on Windows 7 and I'm having trouble with the firewall. The application receives various events over TCP from a network device but the connection port varies ...
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How to inspect DSL router? [closed]
There is a DSL connection and a DSL router (Speedport W 701V). After some days or weeks (I didn't record the events) the router makes some problems.
Internet connection is ... broken but not ...
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Monitor Application Network Activity
I use TCPlogView to see all tcp activity of a software.
for example:
An app (sample.exe) downloads this file in background: google.com/dl/sample.txt
when I track it with a TCP software I see this:
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How are local ip addresses separated from public ones?
How does tools like ping, or any other tool that uses the tcp/ip protocol know that for example 192.168.1.1 or 10.0.0.1 is a local ip address while 8.8.8.8 or 74.142.23.95 are public?
are 192.168.x.x ...
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Why don't outgoing TCP/IP connections need firewall ports to be opened?
While creating an incoming TCP/IP or UDP connection we need for a firewall port to be opened or to get privilege for the specified port.
Why not for outgoing TCP/IP connections?
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Change TCP sequence numbers for packet replay?
First off, I'm using wireshark for capture and colasoft for replay. I'm attempting to replay a group of captured packets back, looped to be done several times over (the purpose of this is just to send ...
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How to monitor TCP connections over time
I have an application which is a windows service. It accesses a number of other services using TCP/IP. E.g. sql server databases, informix databases, mail servers, etc.
For instance it will also ...
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No ping response, still transmitting data [closed]
Why would a device with a static ip not respond to a ping, but still transmit information over the network?
In my situation the device is a very simple caller ID box. It has no GUI. It's only purpose ...
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how to setup linux-igd to use webserver on same machine
So I have a web server on port 80 and linux-igd/upnp running on the same machine using dhcp. I want to configure linux-igd to be a way to get to the webserver.
I found this tag in the linux-igd xml ...
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How to increase the TCP timeout on Windows 7?
For a test purpose, I would like to increase the default tcp timeout to say 2 mins.
I tried this:
How to set TCP/IP abort interval or timeout in Windows XP?
http://support.microsoft.com/kb/170359
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How do I prevent Linux kernel from responding to incoming TCP packets?
For my application, I need to intercept certain TCP/IP packets and route them to a different device over a custom communications link (not Ethernet). I need all the TCP control packets and the full ...
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Resetting TCP/IP Settings on Windows 8
Apparently, there's a command:
netsh int ip reset
which resets TCP/IP settings for Windows XP/Vista/7, but I'm not sure that it works correctly on Windows 8.
When I typed the command under command ...
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Down sides of lowering tcp time_wait value on windows server 2008
i am building an adserver. In tests i see lots of TIME_WAIT state due to the use of an in memory db redis.
Forums suggested lowering the time wait value from registry.
Any down sides ?
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Where'd my wireless go?
Got an old Lenovo R60e running XP Home that I use for misc. wireless tasks around the house. I had need to print from a fixed workstation to a USB printer in another room. So, I turned on printer ...
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Unable to query ports on windows network
I have 2 environments that need to speak with each other, 2 servers are sitting in our test environment and 1 is in our corp environment.
Client A was setup over a year ago and works as expected, I ...
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Trouble getting VPN to work with my router, possible WPAD issue
I've been having a problem using Cisco Anyconnect VPN on Windows 7 with my wireless router (a Belkin F5D8635-4 v1 Wireless N). It connects sometimes, but often won't until the router has been reset. ...
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FTPS - Can't Open Data Connection over WAN
Here is my setup,
1 Windows 2008 R2 Standard Box /w G6 FTP Server installed
G6 is configured to use explicit SSL connections only (TCP:990)
1 WatchGaurd Firebox Firewall (between server and internal ...
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Capture TCP communication on a specific port using wireshark
I have build a simple TCP server which listens on port 9999, and it has IP address 202.168.66.1. I have a TCP client which has the same IP address and connects to the server on the said port.
Now ...
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How to know which Windows application does listen on a particular TCP port? [duplicate]
I have been using a personal HTTP proxy to remove ads and boost caching for a while but have then noticed that my Firefox still works when the proxy application is shut down (while the browser is ...
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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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how tcp stack deal with the ack_seq number and seq number of tcp FIN/ACK packet?
from my knowledge, seq and ack_seq are processed by tcp stack independently.
when a packet arrives with a inconsistent ack_seq number
if: 1) the ack_seq number is obsolete(smaller than expected), e....
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