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 setup a publicly hosted tcp/ip webserver to receive gprs packets(lat/long and other data) sent from a sim900A gsm module

I want to send the foll data (lat/long, date/time, velocity, deviceID) using gprs (tcp/ip connection) from a gps/gsm tracker i made (using sim900A as the gsm/gprs module). I know how to send data to a ...
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how to enable 'Properties' button of TCP/IPv4 in Network connections in Windows 7

In the Control Panel\Network and Internet\Network Connections, I have a Wireless Network Connection. When I right-click on it, a properties dialog opens. Now, I need to change the IP address for ...
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4answers
48 views

How can I check what is my ip on any particular endpoint?

I know I can do curl curlmyip.com or something like that, but that just shows me the ip curlmyip.com is seeing. Is there any tool I can use that tells me what's my ip on the endpoint for any TCP ...
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2answers
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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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4answers
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Windows keeps using a preferred DNS server?

I have trouble using Panera WiFi, and I finally tracked down the problem: Every time I reboot, Windows resets my TCP/IP settings for my wireless adapter to use a specific DNS server, instead of ...
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28 views

Can one TCP segment be fragmented into more IP datagrams?

In learning materials is often a picture of one TCP segment which is inside one IP datagram which is in one link-layer frame. Is this always the case? Is there guarantee that TCP segment is atomic ...
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1answer
16 views

Is network packet synonym to IP datagram?

The word packet as in packet-switched network is often mentioned in context of various layers, from transport to link and I am slightly confused and I do not know what layer it refers to (if there is ...
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0answers
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How to get tcpip over usb on WinCE with Mips-II without rebuilding the OS?

I have a device with a "mini usb B female" socket, which runs WinCE 6.00, the cpu is MIPS-ii (mips-2 or MIPS32-au13xx). I'd like to use ethernet networking on the device, but since I have no network ...
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2answers
154 views

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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47 views

Can telnet be used with any application level text protocol based on TCP/IP?

Can telnet be used with any application level text protocol like http or smtp?
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32 views

How can I create Local Loopback on Linux (RedHat or Debian)?

How can I do the same on Linux (RedHat or Debian)? I need to create local loopback as shown herein: ...
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37 views

Add static IP to windows XP

In our office we have two internet connections. one for main use and one for backup. this backup connection equipped with WImax connection and cisco 800 series router.this is always ready to plug to ...
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1k views

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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2answers
841 views

TCP\IP Packet Signature - how to identify such data packets?

I know of a program that can "carve" (look for) TCP IP Packets from raw binary data. The results it presents are the source and destination MAC addresses, the source and destination IP addresses and a ...
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1answer
545 views

retransmission of lost TCP segment

What will happen in the following scenario (assume the connection is already established): (stack A) send 10 byte data (stack B) send ACK for 10 byte data (stack B) send 200 byte data (stack B) send ...
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3answers
23k views

How to get a Port to listen on Windows 7?

I have followed the step by step instruction to open a port on Windows 7, setting both Inbound Rules and Outbound Rules to following specification: Protocal Type: TCP Local Port: 55000 Remote Port: ...
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1answer
64 views

Routers Upstairs / Downstairs, allow them to talk?

I recently installed another router upstairs because the downstairs one didn't reach via WIFI. The second router takes its WAN connection from downstairs (I only have 1 physical connection to the ...
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3answers
3k views

Why was 169.254.x.x chosen as self-assigned IP? [closed]

Were there any particular reasons that 169.254.x.x was chosen as self-assigned IP? Its binary form doesn't look nearly as "whole number-ish" as other commonly used IPs like 127.0.0.1 or 192.168.0/1.1. ...
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1answer
11k views

Force socket close

Is it possible to close an established socket connection in Windows "manually" (e.g. using a command prompt tool)? I have several open sockets connected to a listening server, I can see them using ...
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1answer
51 views

How to prove maximum concurrent connections limit in windows?

We need to verify that our clients (Windows Vista SP 2 and Windows 7) are able to open more than 10/20 connections. I found an answer which states the limit was removed, but without any source like ...
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4answers
1k views

How do you block specific urls and not entire domain

I want block a URL on specific computer, in this case www.google.com/reader but i not want to block the entire domain of google. It is for my work machine as I don't seem to have enough self control ...
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1answer
80 views

How to block access to certain websites without additional programs?

Say I want to block "xxx-xxxx-xxx-xxxx" and that alone from being accessible from any web browser on the system. Is there any way to do that plainly and simply without having a need for bulk ...
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1answer
624 views

Win 2k3 Connections Limit per ip:port

I want to limit connections number per ip on specific port. Should I use some firewall or anything else? Advice please. P.S. Port doesn't have to be port 80, or 3389. It can be any port
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1answer
35 views

windows tcp/ip settings per network

In Windows 8.1 is there any native way to set network adapter settings per wireless network? I need to have one network (essid) where I manually specify the ip-adresses and all others DHCP. DHCP is ...
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1answer
99 views

TCP/IP to Serial - Serial Server

I have a server with 8 COM ports which I would like to make accessible via TCP ports, I've done quite a bit of research and tried numerous solutions including ser2net etc. All of which unfortunately ...
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701 views

Determining what process has bound a port (without listening) on Windows

If I want to find out what process is listening on what socket, I can use netstat/TCPview and will immediately see it. However, it is possible to bind to an address without listening. If this is done, ...
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115 views

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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3answers
291 views

Role of OSI layers when we open a url in browser?

I have searched on this topic a lot but I am not able to understand how and where OSI layers (Application, Presentation, Session, Transport, Network, Datalink, Physical) come into picture in the whole ...
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0answers
60 views

netsh set autotuninglevel: “the parameter is incorrect”

When trying to do netsh int tcp set global autotuninglevel=disabled from a command prompt, I get the error message "The parameter is incorrect". Several search results suggested "disabling 64-bit ...
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1answer
226 views

How configure OMRON (V750 RFID Reader) via browser-based interface?

I have a OMRON V750-series UHF RFID System. I'm trying to access it in a browser via IP address 192.168.1.200. However, I can not gain access to it. Do I need to change my TCP/IP config?
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1answer
60 views

Redirect TCP/IP to COM port driver

There are many programs which emulate a COM port and let you redirect it to an ethernet port. I want to do the opposite of that. Create a virtual ethernet port that redirects to a physical COM port. ...
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5answers
164 views

Trying to understand IP packet flow

So I'm having trouble understanding how packets travel from one machine to another. Below I've put in an example of Computer 1 trying to connect to Computer 2. Computer 1 IP: 192.168.1.11 Subnet: ...
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784 views

Assign IP address to a Virtual Printer

Is it possible to assign an IP to a virtual PDF Printer? Is there any Virtual printer software that automatically can do this?
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42 views

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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5answers
2k views

Editing the hosts file

I'm looking to edit the Windows TCP/IP hosts file (at c:\windows\system32\drivers\etc\hosts). I'm wondering, what is the best way to do this (on Windows XP)? Let's say that I want to redirect, say, ...
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1answer
80 views

Where can I change IPv4 Domain name on HP CP3505 Laserjet printer?

I can't seem to find the settings under the menu. I tried to find it under TCP/IP but to no avail. I forgot to add that under IPv4 it says ARP Duplicate IP Address...
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1answer
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Connectivity between devices plugged into a router ethernet ports

If I plug 2 computers into free ethernet ports in my wifi router will I be able to establish connection between these pc or router does not allow it?
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1answer
2k views

How to send data to tcp server from command prompt [closed]

I am a java developer and quite aware of socket programming in java.I have a tcp server running my localmachine.I can write java codes for client and check communication between server and client.But ...
2
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1answer
43 views

Close all ports except for one on a Debian machine

I wish to set up a secure home file server on a Debian computer. I will be using my own server software that utilizes only a single TCP port. To make sure that the machine is fully secure, I'm ...
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1answer
34 views

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 1-126 224-239 240-254 ...
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1answer
152 views

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. ...
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3answers
3k views

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 adress:port, destination adress:port. For example I ...
58
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2answers
113k views

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/indicate?
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1answer
120 views

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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4answers
4k views

Disable access to TCP/IP and DNS Network Settings on Windows 7

here's my question: i have a desktop pc Windows 7 powered with two accounts with administrative rights. One of those is used by my brother. I study abroad so i need to be able to connect to my ...
7
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12answers
5k views

Why is IP to MAC address translation needed?

On networks that use the TCP/IP protocol, why is the IP address translated into a MAC address? I mean, when every device knows its IP, why further use the MAC address and not use the IP number as ...
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5answers
6k views

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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14 views

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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1answer
128 views

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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1answer
94 views

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 ...