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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Is it necessary for an RST packet to have an acknowledgement number?

I am studying about TCP reset attack. I know that some RST packets have an acknowledgement number (with the ACK bit set), and some RST packets do not have an acknowledgement number (the ...
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171 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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58 views

Is there a way to know WHEN a connection has been established?

I'm working with mobile IPv6 and was dealing with lots of zombie connections. I set keepAlive to true and want to test whether old connections are being discarded. I'm using lsof to list the process ...
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40 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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382 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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568 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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55 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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185 views

Why are there limitations on TCP segment size?

I have a question about the limitations on the segment size in the transport layer. Since the data has to get to the lower layers why will it be fragmented? Finally the data is sent in bits at the ...
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451 views

IP checksum offload

I recently updated to Windows 8 and get alot of invalid packet transfers. It says "Ip checksum offload?" (Wireshark) and most of my packets get lost. The checksum is 0x00. I also updated my NIC ...
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683 views

Replace sensitive IP addresses in Wireshark with XXX.XXX.XXX.XXX

What would be an easy way to replace a sensitive IP address in a Wireshark packet capture with XXX.XXX.XXX.XXX? When I export the pcap in txt or csv I can no longer import it into Wireshark.
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1k views

Which free software can convert Serial to Ethernet?

I'm using Serial over Ethernet, but it's not free. Is there any free software that can do the same thing?
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841 views

Determining cause of TCP/IP connect issue

I need HTTPS access to the host ws.betaqxl.com, but connect fails: :: curl -k -v https://ws.betaqxl.com * About to connect() to ws.betaqxl.com port 443 (#0) * Trying 91.204.81.183... Timed out * ...
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664 views

Fix Internet connection stalls (packets getting stuck somewhere?)

The wireless AP I've been using has glitched out and the two symptoms are the DHCP server no longer working, and random stalls in the connection. I can't reboot it, so I've been trying to solve the ...
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137 views

workstation 7 and host-only no connectivity

I have a WinXP 32 host (IBM T400) with VWware workstation 7 (7.0.1 build-227600) and some guest OS (Win xp, NT, etc.) I can ping from the host to guest OS and vice versa, but... every other ...
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40 views

How to get a network of different IP addresses on IPv6?

Does anyone know if it is possible to get a network of different IP addresses on IPv6 (not sure if they have it in my area?). What I'm thinking is maybe I could have a little network like at work now ...
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1k 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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7k views

How to reset Host Only Adapter Networking for Oracle VirtualBox VM Manager

My Host Only Networking stopped working, how do I reset it ? I tried disabling and re-enabling Local Area Connection and VirtualBox Host-Only Network but VirtualBox Host-Only Network is still ...
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421 views

Service to transparently use an HTTP CONNECT proxy on Linux

As our corporate network provides an HTTP CONNECT proxy for people who need to connect to the outside world, and as every Linux application needs to be set up specially to use it, I was thinking about ...
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233 views

Mounting an NFS share with udp or mntudp options

According to the documentation of NFS client on Mac OS X 10.7 user can specify following options: udp Use UDP transport protocol. and mntudp Force the mount protocol to use UDP transport, ...
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16 views

DHCP-Enabled Router Sometimes Won't Talk to Host with Static IP

I have a Windows 7 host connected to a router running DD-WRT. The router is running a DHCP server. For reasons I don't need to detail here, I have set a static IP on the host, as opposed to ...
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75 views

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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85 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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94 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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55 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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107 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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592 views

TCP/IP Netbios fail; Dependant service “NetBT” not installed

I've been hit by zeroaccess virus last week, it corrupted the internet connection and dns system. I cleaned everything and everything is working fine except pppoe connectins, they fail with Error 720 ...
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6k 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.
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56 views

Name the scope and what layer of the tcp/ip model the following address belong to

For the following addresses, 136.206.11.5 0C:5F:56:C0:DD:08 PORT 80 These are the questions: What is the scope(LAN,internet, machine)? What layer of the TCP/IP 4 layer is the model is involved? ...
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15 views

How do I create a Docker container with a non-default IP address?

I created a docker container with this command: docker run -p x.x.x.x:80:8080 <imageName> bash where x.x.x.x was the IP address of the Docker server running CentOS version 7. I then tried to ...
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28 views

How to disable TCP Checksum for wireless device in Windows 10?

I want to disable TCP Checksums on my wireless adapter. For ethernet device, I can turn on/off TCP checksum as it can be seen down below; However, for wireless adapter, there is no such an option ...
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113 views

No connection could be made because the target machine actively refused it

On Windows machine, I start a server on port 62325 $ netsh firewall show state shows: Ports currently open on all network interfaces: Port Protocol Version Program ...
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53 views

How to simulate TCP simultaneous open and close conditions?

I am learning TCP/IP protocol. I want to see simultaneous open, close, half open/close, etc conditions in practice. I have created simple TCP server and client program. How can I simulate simultaneous ...
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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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94 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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76 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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43 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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113 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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376 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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206 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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698 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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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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257 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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848 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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155 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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180 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 ...
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373 views

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), ...
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Determining contributors to elapsed time during a network request

The situation: There is a remote server. I am running a client program that makes calls to the server and requests data. These requests perform very slowly. The server limits the number of results ...
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DNS server keeps changing from Auto to Manual

A friend at a company I know has a fairly new Windows 7 laptop. She was complaining that the "internet doesn't work". After looking at it the first time, in Wireless > Status > Properties > ...
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Please get me outta here.. Stubborn APIPA

Any one please help me.. I am getting an APIPA since three days.. I did all the steps mentioned in answers to this question. Still they did not resolve my problem. At last I formatted whole of my ...
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988 views

why does my time warner cable modem connection enter dead period states every 20 mins?

My wifi connection (from my MacBook running Snow Leopard) to a Time Warrner cabel model and router has a recurring connection problem. Every 20 minutes or so it will enter a "dead state" where no ...