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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Single TCP retransmission causes 15 seconds delay on wireless

I am having a strange problem which causes long delays in http requests (POST in this case) to my own web server. This occurs only if - a linux or Mac client is used (Windows is fine), and - the ...
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1answer
36 views

Ways in Which TCP/IP Stack Fails?

In a variety of books and learning materials, we're told that if pinging the localhost/loopback address fails, this is a sign of a malfunctioning TCP/IP stack. What we aren't told is why/how this may ...
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3k views

I accidentally deleted winsock registry [on hold]

I am in a crisis here, and quick help is greatly appreciated.I have finals tomorrow, and I need my computer to study for it. The internet was not working, so I tried to fix it by deleting the ...
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3answers
72 views

Relation between TCP conversations and TCP streams in Wireshark

I have read about Conversations and TCP Streams but I'm still a bit unsure how they relate to each other if they are on the same layer. For different layers, it's clear to me that e.g. an IP ...
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23 views

Firefox strange connection established, what is this?

I have accidentally found inside firefox process properties (using Process Explorer) a weird connection in tcp/ip tab: bandicam.com:some_ports it points at localhost 127.0.0.1:some_ports but ...
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37 views

Laptop can't ping (or see on arp) network printer. All other devices can

I have a small home office network. Two laptops connecting to the router wirelessly and the printer (Sharp MX2301N) is connected to the router by ethernet cable. The Faulty Computer (FC), running ...
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30 views

Kill TCP connection in VMware ESXi 5

If there anyway to kill a tcp "TIME_WAIT" state connection in VMWare ESXi~ # esxcli network ip connection list Proto Recv Q Send Q Local Address Foreign Address State World ID ...
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57 views

Will a WSD Port monitor block the detection of a TCP/IP port?

I have a printer set up on our print server that inadvertently diverted to a WSD port monitor. The intention was for it to be configured pure TCP/IP. When I went to add a local printer and use the IP ...
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255 views

Python: TCP/IP Socket Client, how to send login packet?

I wanted to create a bot to send login/join packets to a game server. So it will join then send more packets for it to write something in the chat, but I'm not sure how to do this. If someone could ...
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2answers
111 views

What are the detailed OSI model steps involved in connecting to a website?

What are the detailed steps involved in connecting to a website, such as superuser.com home page using a newly connected computer (http, and nothing cached)? What is actually happening in the ...
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51 views

Right way to “pause” the network interface controller on Windows 7?

I have machine with Windows 7 and with ethernet NIC (network card). I want to interrupt data flow (like when I pull out the network cable). But I do not want Windows to stop network stack (network ...
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41 views

Change TCP/IP settings automatically depending on connected network

I use Simple IP Config which lets you create profiles and you can manually change them when you need to. I'd like that to go one step further and automatically change the adapter's TCP/IP settings ...
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54 views

How to block HTTP 302 redirection package by matching a specific string on Location?

The HTTP response I want to block has: Header HTTP/1.1 302 Found Location: ...
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3answers
2k views

Does the sequence number of TCP packet headers wrap around?

I was wondering, since the sequence number in a TCP header field is randomly chosen during the handshake and is gradually incremented as packets are exchanged, what happens after 2^32 - initial_seq_no ...
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295 views

Windows 10 Unidentified Network Issue

I am running Windows 7 on my PC but I installed Windows 10 Enterprise as a virtual machine using VMWare Player. My Network Adapter setting on VMWare are set to "NAT:Used to share the host's IIP ...
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2answers
857 views

disabling hyper-v in windows 10 causes complete network failure

I have disabled (uninstalled) Hyper-V so I can run VM-Ware and have completely lost the network. It shows the cable connected but there is no internet connection. Ive tried a different cable and have ...
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164 views

static IP not saving in LAN properties

static ip is not saving int lan tcp/ip properties i.e once I enter a static address with subnet mask, default gateway Etc.. it accepts the details, but then I close the dialog and when I come back in ...
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86 views

TCP packet issue with 802.11ac but not with 802.11n on an Android Nexus 6

I have an Android Nexus 6 that connects to my computer via an ad-hoc network. When my phone connects to the 802.11n card (TP-LINK 300Mbps Wireless N), the bytes are sent with no issue; verified with ...
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433 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 ...
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611 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 ...
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35 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 ...
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1answer
146 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 ...
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49 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 ...
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42 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 ...
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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 ...
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1answer
1k 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 ...
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1answer
561 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 ...
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80 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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1answer
50 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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2answers
295 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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2answers
103 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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190 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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1answer
50 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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1answer
294 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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1answer
366 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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1answer
191 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
56 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
429 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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3answers
2k 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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1answer
178 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
951 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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96 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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1answer
314 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
22 views

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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4answers
22k 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 ...
2
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1answer
9k 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
48 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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2answers
51 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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2answers
352 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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361 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. ...