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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19
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8answers
115k views

How to find the MAC address of a remote computer?

I know the IP address of a host on my own LAN. Using that, how can I find its MAC address (without having to physically access it)?
2
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3answers
12k views

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 ...
6
votes
4answers
1k views

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 ...
1
vote
1answer
29 views

TCP congestion control Windows 7

Based on what I read, Compound TCP is disabled by default in Windows 7. If so, which default congestion control algorithm does windows 7 use? Is it TCP RENO or NEW RENO? Could you give me some links ...
0
votes
0answers
64 views

Cannot ping to default gateway from computer inside private network

I have one desktop PC, laptop and android mobile. I have created a WiFi hotspot on my desktop PC so that I can use my internet on mobile as well on a laptop and it's working great, but now I want to ...
0
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0answers
4k views

Simple way to open Port for Transmission for a Mac Snow Leopard

I am a complete noob when it comes to TCP/IP, but would like to open up my port for the Transmission bit torrent client on Snow Leopard Mac. Also, I am based in the UK if that has any relevance.
0
votes
0answers
10 views

Is it possible to rewrite the IP packet on tunnel interface in Mac OS X 10.10 (Yosemite)?

I am trying to rewrite the destination address (to 127.0.0.1) of an IP packet received from a TUN/TAP interface on a Mac OS X 10.10 (Yosemite) machine. Will the kernel route the packet again to ...
2
votes
1answer
80 views

What happens when I terminate a process and the socket send buffer is not empty?

In Windows (and probably in other operating systems), if a process has a TCP connection with another process on another machine, and then I terminate the process, an RST packet will be sent to the ...
1
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0answers
21 views

Ekiga softphone shows as “registered” — but is it actually?

Is Ekiga actually registered? How would I know? I think Ekiga connects, or at least it says "registered": But, when I exit Ekiga, and use SFLphone, it fails to register: While sipsak shows a ...
0
votes
0answers
20 views

Check if ports are open for talking

I have a software (HP BSM) installed in a Windows server 2008 R2 Std This software needs to "talk" through a specific list of TCP ports and "listen" through other TCP ports. How can I know/check if ...
2
votes
1answer
666 views

What is protocol suite?

I came across protocol suite in Internet Protocol suite, and after I searched for it I found: http://en.wikipedia.org/wiki/Protocol_stack#General_protocol_suite_description which explains protocol ...
4
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5answers
9k views
0
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0answers
21 views

Network lost when doing big transfers

normally my wireless network works fine but when I'm doing big (and fast) transfers the network stops working until I reconnect to the Access Point. Check the following screenshot taken after the ...
5
votes
3answers
91k views

How to check if TCP port 1723 and GRE protocol port 47 are blocked or not in Windows 7?

I am trying to connect to a VPN Server (BestUKVPN) but I'm failing each time I try. I get a "691 error" but the username and password are OK. I searched and I am told that "port 1723" or 'GRE ...
9
votes
2answers
5k views

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?
0
votes
4answers
170 views

If people transfer a lot of data on the local network can Internet connection become slow?

At my work there are at least 40 people sharing the same internet connection link over the same switch that is used both to internet access and local traffic of large file. People here usually use ...
0
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0answers
124 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 ...
8
votes
3answers
37k views

How to kill a particular tcp connection in windows?

On Linux we can kill an Established TCP Connection using tcpkill command. For example, to drop all connection to/from a particular IP: tcpkill host ipaddr Or similary to kill all connection ...
0
votes
0answers
126 views

Media State Says Media Disconnected, but I can still connect to internet

I tried to reset my ip address to resolve problems with connecting to the internet, but I've run into some problems. I can still connect to the internet, but I constantly run into the following ...
0
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0answers
30 views

tcp/ip route command has stopped working

I am getting this error "tcp/ip route command has stopped working" when I am trying to access my email through my TOSHIBA laptop. Actually, when I login, I am getting "This webpage is not available". ...
0
votes
1answer
318 views

The difference between data link layer and transport layer in tcp/ip stac

In TCP/IP protocol there are some alike functions at the data link layer and transport layer such as: flow control numbering reliability errors control Why there are the same functions in two ...
0
votes
1answer
219 views

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 ...
1
vote
4answers
60 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 ...
4
votes
4answers
6k views

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 ...
0
votes
2answers
87 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 ...
1
vote
1answer
32 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 ...
1
vote
0answers
36 views

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 ...
0
votes
2answers
195 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 ...
0
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2answers
65 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?
0
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0answers
102 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: ...
0
votes
1answer
45 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 ...
0
votes
2answers
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 ...
1
vote
2answers
1k 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 ...
1
vote
1answer
548 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 ...
1
vote
3answers
27k 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: ...
0
votes
1answer
180 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 ...
2
votes
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. ...
5
votes
1answer
12k 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 ...
0
votes
1answer
108 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 ...
0
votes
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 ...
1
vote
1answer
111 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 ...
0
votes
1answer
637 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
0
votes
1answer
46 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 ...
0
votes
1answer
201 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 ...
12
votes
1answer
811 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, ...
1
vote
4answers
121 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 ...
0
votes
3answers
630 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 ...
0
votes
1answer
237 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?
0
votes
1answer
90 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. ...
2
votes
5answers
309 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: ...