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 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
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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2answers
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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0answers
10 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 ...
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2answers
45 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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28 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
36 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
58 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
50 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
78 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
34 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
93 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
261 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
59 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
59 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
161 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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0answers
41 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
78 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
17 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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2answers
9k 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 ...
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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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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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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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1answer
119 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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1answer
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
90 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 ...
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2answers
68 views

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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2answers
300 views

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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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 ...
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1answer
207 views

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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0answers
278 views

BOOTP packets blocked while DHCP packkets 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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0answers
71 views

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), ...
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0answers
19 views

TCP behavior in microsoft products

What happens when a TCP SYN segment is received on a closed port? Does windows send a RST or it just ignores it?
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1answer
67 views

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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2answers
500 views

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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1answer
49 views

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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1answer
32 views

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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0answers
36 views

Looking for a tool or technique that show IE or Chrome ask right net adapter or choose right route to connect to an IP on Internet

Using Windows 8.1 Enterprise, When I surf the internet, I feel that there is a connectivity issue within my network stack. Any time try to open a page, there is delay. Once the browser connects, the ...
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0answers
130 views

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 ...
2
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1answer
120 views

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 ...
0
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1answer
133 views

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 ...
3
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3answers
869 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 ...
2
votes
1answer
105 views

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 ...
6
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1answer
102 views

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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4answers
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 ...
1
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1answer
86 views

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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2answers
3k views

Does TCP/IP model has 4 layers or 5 layers?

In some sites , It is given that tcp/ip has 4 layers,network access,internet,transport,application. But in some other references , it is given that it has 5 layers (instead of network access, physical ...