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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What is the default range of Ephemeral Ports in Windows 7?

I used the following command to get the Ephemeral Ports range in Windows 7: netsh int ipv4 show dynamicport tcp And the result was the following: Protocol tcp Dynamic Port Range -------------------...
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60 views

What happens if all of the Ephemeral Ports are used in Windows?

If all of the Ephemeral Ports are used, and another socket tried to connect to a server, will the connection fail? or will the socket be assigned a port outside the range of the Ephemeral Ports?
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38 views

Access Point mode in USB WiFi adapters in Windows

Some USB Adapters, for example, many of the chips such as RTL8191SU, have option to set mode to either Station, or Access Point, or Soft AP. In Station Mode, it acts just as a WiFi client. In ...
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34 views

Windows: ipv6 version of “netsh int ipv4 install”

I need to reinstall TCP/IP V6 protocols on my Windows 10 64 bit PC. I know I can do this for TCP/IP V4 using netsh int ipv4 install in an elevated cmd prompt. When I run netsh int ipv6 install I ...
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2answers
49 views

Why does a USB Adapter set to monitor mode on Linux not capture non-WiFi traffic send on the same frequency (2.4GHz) as WiFi ?

I have a WiFi Adapter from Alfa that can function in Monitor mode on Linux. Once I set it up and run Wireshark, I am able to see traffic across other routers and devices. If there is a new protocol ...
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60 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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213 views

What layer of the TCP/IP do MAC addresses and IP addresses belong to?

Can anyone also tell me why we have 2 layered models(OSI AND TCP/IP)? Just having a bit of trouble with the question above. Can anyone kindly help?
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1answer
30 views

are TCP connections made while typing the URL

Do browsers make TCP connections while typing the URL in address bar? I launched nettop utility, and was surprised of how active my connections are, even while only typing an address and not visiting ...
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21 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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22 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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30 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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1answer
554 views

One or more network protocols is missing on this computer

I just rebooted my Windows 10 PC, tried to connect to the internet and got a message saying "One or more network protocols is missing on this computer". The Windows troubleshooter is unable to fix the ...
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1answer
34 views

Malware Allowing Remote Access to my Machine

I would like to understand how Malware allows a remote connection to my machine. Am I correct in thinking that my modem / router will block all inbound connections from the internet? A scan has shown ...
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2answers
56 views

RST sequence number and window size

RFC793 states the following about RST processing: In all states except SYN-SENT, all reset (RST) segments are validated by checking their SEQ-fields. A reset is valid if its sequence number is ...
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1answer
71 views

HP Laserjet 4000T prints PCL XL UnsupportedProtocol error

I have a working CUPS setup, configured for a HP LaserJet 4000T printer. It works fine from all stations, except Windows 10-x64. There is no HP LJ 4000 printer in the list with installable printers, ...
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226 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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81 views

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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1answer
44 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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1answer
3k views

What other protocols can run over the Link Layer besides IP protocol?

I am reading about ARP here and it says "Each protocol is assigned a number used in this field. IPv4 is 2048 (0x0800 in Hexa)." What are other alternatives to IPv4 and IPv6 as protocols to be run ...
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2answers
143 views

Send TCP with incorrect checksums

I'm having trouble sending large files to an OpenStack machine. Our Internet connection is over LTE so bad packets are to be expected. However, even sending data over TCP results in corrupted data ...
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1answer
30 views

Listen to localhost messages

Suppose a TCP/IP client application has connected to a certain port on a server. Both client and server are operating on localhost. Is it possible for another application (also on localhost) to ...
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2answers
45 views

what distinguished OSI from TCP/IP in practice?

so i am going through cisco ccent/ccna. working through the text on my own just for general useful knowledge. so in the early part of the book it goes into describing the different layers of the TCP/...
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72 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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88 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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1answer
41 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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3answers
335 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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50 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 bandicam ...
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102 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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60 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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117 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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1answer
491 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
183 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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84 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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133 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: http://www.yxjiaodai.com/ad/?id=1023&url=http%3A//a1819.oadz.com/link/C/1819/3081547/dtMdon4l79FwsIo2JXEHqtdp5eQ_/p007/...
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3answers
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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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456 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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3answers
1k 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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220 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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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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1answer
845 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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717 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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1answer
190 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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0answers
62 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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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
2k 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
768 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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4answers
103 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
59 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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395 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 ...