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.

learn more… | top users | synonyms

1
vote
1answer
3k views

Resetting TCP/IP Settings on Windows 8

Apparently, there's a command: netsh int ip reset which is known to reset TCP/IP settings for Windows XP/Vista/7 and I'm not sure how it works correctly on Windows 8. When I typed the command ...
0
votes
1answer
229 views

Down sides of lowering tcp time_wait value on windows server 2008

i am building an adserver. In tests i see lots of TIME_WAIT state due to the use of an in memory db redis. Forums suggested lowering the time wait value from registry. Any down sides ?
0
votes
1answer
93 views

Where'd my wireless go?

Got an old Lenovo R60e running XP Home that I use for misc. wireless tasks around the house. I had need to print from a fixed workstation to a USB printer in another room. So, I turned on printer ...
0
votes
1answer
52 views

Unable to query ports on windows network

I have 2 environments that need to speak with each other, 2 servers are sitting in our test environment and 1 is in our corp environment. Client A was setup over a year ago and works as expected, I ...
1
vote
1answer
745 views

Trouble getting VPN to work with my router, possible WPAD issue

I've been having a problem using Cisco Anyconnect VPN on Windows 7 with my wireless router (a Belkin F5D8635-4 v1 Wireless N). It connects sometimes, but often won't until the router has been reset. ...
0
votes
1answer
220 views

FTPS - Cant Open Data Connection over WAN

Here is my setup, 1 Windows 2008 R2 Standard Box /w G6 FTP Server installed G6 is configured to use explicit SSL connections only (TCP:990) 1 WatchGaurd Firebox Firewall (between server and internal ...
0
votes
2answers
754 views

Capture TCP communication on a specific port using wireshark

Hi i have build a simple TCP server which listens on port 9999 and has an 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 ...
0
votes
1answer
207 views

How to know which Windows application does listen on a particular TCP port? [duplicate]

I have been using a personal HTTP proxy to remove ads and boost caching for a while but have then noticed that my Firefox still works when the proxy application is shut down (while the browser is ...
2
votes
2answers
736 views

TCP header option: SACK-permitted (Selective Acknowledgments) negotiation

I'm doing a research project, which needs to split tcp connection. so I have some pecular questions, which may happen in my development. The problem is understanding of TCP SACK-permitted ...
0
votes
0answers
183 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), ...
0
votes
0answers
50 views

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 ...
7
votes
1answer
695 views

Tcpip error: Request failed due to all such ports being in use

Today my machine stopped being able to access the internet. I can still access some local network resources. When I looked in the error log I saw following tcpip warning: A request to allocate an ...
0
votes
3answers
166 views

How do I test network performance between server and smart-devices

I am currently working on a test use case where I need to test performance (benchmark) between a server/computer and smart-devices (tablet, smartphones etc.). The benchmark I want to do is based on ...
1
vote
1answer
564 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 ...
0
votes
1answer
142 views

How does the browser know which packet is the response to a specific request?

I am sniffing the in/out packets over TCP. I have some GET output, but I want to know which of the packets is the input? How does the browser determine this? Simpler explaination: I'm sniffing and I ...
0
votes
1answer
3k views

Not able to ping remote server

I am getting Request Time Out on pinging a remote server. I am on my laptop connected to the this server via Remote Desktop Connection. tried but still not able to ping it. I just want to ellaborate ...
0
votes
0answers
477 views

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 > ...
11
votes
1answer
523 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, ...
2
votes
2answers
3k views

How do I log outgoing TCP connections from my computer?

I'm trying to track down a problem where something is causing my active directory account to get locked out. I think that I could figure it out if I can log all connections to 2 specific servers. I ...
0
votes
0answers
121 views

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 ...
1
vote
1answer
106 views

Limiting upstream rates for web in Ubuntu 12.10

I found this thread, but am hesitant when it comes to screwing with my network settings. What I want to do is limit the rate that people can download files from my webserver remotely. LAN ...
0
votes
2answers
283 views

XP to Win 7 via ethernet cable. No routers, no wireless. They can't ping each other

I've got a windows XP machine and a windows 7 laptop connected by an ethernet cable. The xp has static ip address 169.254.84.221 and the windows 7 has 169.254.84.220. both subnet masks 255.255.255.0. ...
1
vote
0answers
122 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 ...
1
vote
2answers
389 views

Is there free software that can convert serial input messages to TCP/IP packets?

There is a serial port that can receive text messages from the external device. Now I want to pass these messages to a special software. But that software can only receive TCP/IP packet. For example, ...
0
votes
2answers
79 views

Is it possible to see content of TCP/IP connection?

This is a bit weird. I want to see the content of all TCP/IP connections coming in/out of the system. Is any of this possible on the same machine? I know I won't be able to see encrypted content but ...
0
votes
0answers
3k 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 ...
1
vote
1answer
309 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 ...
0
votes
1answer
264 views

TCP-IP versus TCP-IP over VPN

What are the advantages and disadvantages of a TCP-IP connection over VPN opposed to a regular TCP-IP connection? I am interested mainly in speed and security! Thank you.
3
votes
2answers
503 views

No route to host after changing interface to static ip

I installed a Linux (Ubuntu) server inside my home LAN, initially it's automatically configured to use DHCP interface. I'm connecting to this server from another computer using that server's hostname. ...
3
votes
1answer
429 views

Change the default route without affecting existing TCP connections

Let's say I have two public network addresses on my server: one NAT through an ISP (192.168.99.0/24), and a VPN through a different ISP (192.168.1.0/24), already configured with a per-host route to ...
1
vote
1answer
113 views

How does the internet protocol handle network card numbers?

I know that data packets sent over the internet carry the source and destination IP address, so that the protocol can route the data to the correct destination and keep track of the source address of ...
0
votes
1answer
55 views

DHCP/routing oddness

I have a Squid proxy server on my network that is connected to the DHCPd server (commodity router) through a commodity switch. If there is a break in the connection (eg router needs to be rebooted) I ...
2
votes
2answers
2k views

Are Segments, Packets and Frames the same size if we ignore headers?

I've looked for some explanation about the differences between Segments, Packets and Frames, and from what I read: Segment is the original data + Transport Layer header. Packet is a Segment + ...
2
votes
0answers
250 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 ...
3
votes
1answer
655 views

User defined mapping hostname-to-address without root privileges

Is it possible to define a mapping hostname to IP address in Linux without root access (ie modify /etc/hosts) nor a DNS server ?
0
votes
1answer
192 views

Is it possible to figure out which http request generated the corresponding response

I am using iptables to listen to tcp (http) packets. I am filtering out INPUT responses containing a matching string. Is it possible to know which http request generated the response. Assuming 10 ...
4
votes
2answers
56k 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 im failing each time I try. I get the 691 error but the username and password are OK. I searched and I am told that the port 1723 or GRE protocol ...
1
vote
4answers
3k views

Disable access to TCP/IP and DNS Network Settings on Windows 7

here's my question: i have a desktop pc Windows 7 powered with two accounts with administrative rights. One of those is used by my brother. I study abroad so i need to be able to connect to my ...
2
votes
1answer
462 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 ...
1
vote
0answers
304 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 ...
0
votes
1answer
2k views

TCP Optimizer for OS X?

Does anyone know of a utility similar to SpeedGuide.net's TCP Optimizer or some other way to accomplish the same thing on Mac OS X (preferably with Snow Leopard)?
1
vote
1answer
436 views

MITM attack, Replay Attack, TCP Session Hijacking [closed]

I was going over the internet reading about types of attacks on a computer system and I can not differentiate between MITM, Replay and TCP Session Hijacking. They appear to be the same. Sniff the data ...
0
votes
1answer
175 views

LPR Utility for Windows 98

I'm trying to print to a network printer through TCP/IP in windows 98, however, windows 98 does not support printing to a TCP/IP port, so I read that I can do it through something called LPR. Where ...
4
votes
3answers
5k 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 ...
1
vote
2answers
971 views

IP Routing / Forwarding

I have an older program that I use a lot and in order to work properly it has to connect to a time sever (199.211.133.139), for some reason, I am no longer to ping this time server and the program ...
0
votes
0answers
3k 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
1answer
235 views

My wifi only allow me to use http with proxy-auth, can I use other program which use other protocol?

My school offers students WiFi which only able to use browser or other program which use only http and support proxy-authentication with BASIC Auth. For other program such as windows live messenger, ...
0
votes
1answer
204 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?
-2
votes
2answers
2k views

What layer of the TCP/IP network does ARP belong to? [closed]

I'm working my way through the Sams teach yourself TCP/IP book and it say's that the Address Resolution Protocol belongs at the Internet layer. Is this true? Other sources claim it is a Network ...
0
votes
4answers
139 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 ...