TCP is just one communications protocol on the web. Others include: User Datagram Protocol (UDP) udp Internet Control Message Protocol (ICMP) icmp Hypertext Transfer Protocol (HTTP) http Post Office Protocol (POP3) pop3 File Transfer Protocol (FTP) ftp Internet Message Access Protocol (IMAP) imap ...
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1answer
31 views
What is a good TCP proxy that runs as a windows service?
I'm in a situation where we have a client, a server, then a remote server. The client needs to send commands to the remote server, but it's not possible because of firewall issues. My solution is to ...
0
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1answer
21 views
In TCPView, what does the * mean in the Remote Address field
In TCPView what does the * mean in the remote address field.
5
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1answer
50 views
In TCPView, why does the svchost.exe process need to listen on so many TCP and UDP ports
Looking at TCPView I can see over 25 svchost processes using TCP and UDP ports. If these svchost processes are the various services required by Windows, then why would so many be using the network?
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1answer
21 views
TCP port prioritizing on switch/router (QoS)
I have some HP ProCurve series Switch. There is a QoS option for prioritize traffic by TCP/UDP port. I set two ports: one with highest priority and another with lowest. Then I performed tests to ...
1
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3answers
63 views
Easy-to-use program for directly transfering big files to an IP-address
I saw this xkcd comic and was horrified that he is actually right:
xkcd comic
So, is there an EASY program to share files directly over IP? In the spirit of:
open it
it displays your current IP
...
1
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3answers
146 views
How does circumventing IP restrictions through DNS work in the case of hulu.com?
I just heard from an australian guy that it is possible to watch hulu.com from Australia (which is actually restricted by country IP checks) by using certain DNS servers.
Now I was wondering, how ...
0
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1answer
20 views
Squid log to socket
I've got a simple script listening on port 10101 (tcp) on my primary server which is meant to consume the log files of my proxy (which is running on a separate server).
Now, my problem is that I ...
1
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1answer
40 views
Connection stays alive but endpoint is dead?
Does anyone have an idea what would cause a TCP connection (client side) to stay in the ESTABLISHED state for about 24 hours, even though the server was restarted?
The client process stays on the ...
0
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1answer
99 views
How can I disable TCP window scaling?
I had previously been using Ubuntu 11.10 and recently, Ubuntu 12.04. However, due to a stupid mistake on my part, I was forced to reinstall Windows 7.
One of a multitude of problems is that my ...
1
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3answers
144 views
Subnet mask of 255.255.255.255
I have a subnet mask of 255.255.255.255.( Why is my subnet mask 255.255.255.255?). I refer that from the above question that it is as good as each computer is on its own network and cant interact ...
0
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1answer
63 views
OS X Failure in Path Maximum Transmission Unit (PMTU) Black Hole Router Detection
This all started when I was trying to download a podcast on my Mac. This happens in both Snow Leopard and Lion when the Ethernet interface is set to use Jumbo Frames.
prompt> curl -v -o x.mpg ...
0
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0answers
164 views
Downloads stops - “TCP Window Full”
During the last weeks I encounter a lot of download problems of all programs that are based on Java (Eclipse, Maven, Android SDK manager, ...). The download starts and runs fine until suddenly it ...
0
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2answers
67 views
Transmission Contol Protocol (TCP) confusion
I am confused as to how the TCP actually works. I have read in several books and articles that it is responsible for the rearranging of transmitted datagrams at the receiving host. However, I have ...
0
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2answers
58 views
How to use a different Ethernet connection
I'm running a virtual machine at home which has a VPN connection to our main office, but I also want to connect to a share on another machine at home.
When I check with IPCONFIG I can see two ...
2
votes
0answers
91 views
Why does the IP address matter to IE9?
Start up Wireshark.
Point IE9 to a local, nonroutable IP address. You will see a single TCP SYN packet try to connect to the host.
Now point IE9 to a remote, routable IP address. You will see 2 ...
1
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0answers
68 views
how to find tcp streams without final ack/fin sequence in a huge packet capture file
I have a huge pcap file which contains a large number of individual tcp streams.But out of these , there are some invalid streams which dont have the final fin/ack sequence. Is there any way i can ...
2
votes
5answers
171 views
How do IP answer packets reach their destination inside of a private LAN?
This is a little theory question that has been confusing me for a pretty long time.
Basically, if we are inside of a private LAN, and we want incoming packets to reach, for example, an HTTP server ...
0
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1answer
47 views
How to use proxy to filter data from particular IP?
I am running an online game for kids but lately I have been experiencing attacks from some vile individuals who just like ruining it. I assume (based on Windows log) that they connect hundreds time ...
1
vote
1answer
40 views
How can I setup a Bluetooth device to serve web pages to a BT client via TCP/HTTP?
I'm thinking of making a linux-based Blueooth enabled device, which allows an external client (e.g. a laptop) to connect to it via TCP over Bluetooth and retrive web pages which allow it to interact ...
1
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0answers
36 views
How to route none http request in pound.cfg
I'm trying to route all request that point on the port 3050 to another host, here is what i usually write in the /etc/pound/pound.cfg:
ListenHTTP
Address 10.165.30.58
Port 3050
...
0
votes
0answers
81 views
Can not open port 6000 windows xp
I am trying to connect to macincloud using their software and can not. They told me the reason is port 6000 is not open. I spent 3 hours on the phone today with ATT making sure the 6000 port was open ...
1
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0answers
215 views
Iptables port redirecting. Rule doesn't work or show up in iptabels
I'm trying to redirect some incoming TCP traffic on port 443 to port 999 with iptables in an Ubuntu VM.
I am using sudo iptables -t nat -A PREROUTING -p tcp --destination-port 443 -j REDIRECT ...
0
votes
2answers
279 views
Minimum size of the data part of TCP segment
My question has two parts:
I know that the "data" part of an Ethernet frame can be 46~1500 bytes. Considering the IP header of 20 bytes + TCP header of 20 bytes, the minimum "data" size of a TCP ...
0
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0answers
165 views
drop established tcp connection on linux
i'm have a server that don't close idle connections automaticaly. I'm can detect such connections through netstat or conntrack. But when i'm detect them, how can i'm kill it from command line. I'm ...
2
votes
4answers
240 views
Open a test TCP connection to a specified IP/Port
I'm looking for a tool that works across windows (xp through 7) that will allow me to open a TCP connection to a specified ip and port. This functionality used to exist in windows xp (netsh diag ...
1
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2answers
60 views
Download resume support blocked by isp?
Can ISP block resume support for downloads ?
I'm using IDM (internet download manager) to download of the internet from resume supported websites, yet I am unable to resume downloads. I tried ...
2
votes
2answers
146 views
Why is TCP port 563 opened?
Can someone explain what service opens TCP port 563 and uses it?
I`m using Windows.
0
votes
1answer
91 views
Does change of tcp_keepidle or any of the tcp parameters require a reboot(AIX)?
AIX 5.3
oslevel -r
5300-12
We require to change the tcp_keepidle value using :
no -o <tcp_parameter>= ...
0
votes
2answers
41 views
http ftp imap smtp and some additional ports not working
I'm writing this using a 3G connection on my phone.
At lunch time yesterday, the ports above and a few additional other ports like 40001 and 4089 stopped working on my internet connection at work.
...
2
votes
0answers
109 views
Why is my tcp window size going to zero when using VIM over VPN
I use a mac os laptop over a typical (i.e. crappy) wireless home network and connect to work over a VPN. I ssh into the linux (ubuntu) desktop I have in my office at work. (When I say, "I ssh": I ...
4
votes
1answer
170 views
What is the purpose of ports?
I have a few questions in regard to the following explanation of ports I found.
The Application layer talks to the Transport layer through a port.
Ports are numbered and standard ...
1
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2answers
192 views
Hardware/Software behind IP/TCP layers encapsulation
Every tutorial I read talks about how the layers "communicate" with each other, but never mentions what hardware/software receives, adds on, and sends each layer of control data.
What piece of ...
1
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1answer
121 views
Does mobile phones use TCP/IP? [closed]
Does mobile phones (any kind of mobile phone?) use TCP/IP over radio signals for internet? I would also like to know if they use VoIP for telephony? Please tell me what they use, I'm confused.
3
votes
1answer
41 views
DNSSEC regarding
I'm asking this question as software (and also because there have been a few DNSSEC questions on here in the past).
http://en.Wikipedia.org/wiki/DNS_cache_poisoning#Prevention_and_mitigation
I ...
0
votes
1answer
410 views
How to delete binded port from cmd in Windows 7?
How to delete binded port in Windows 7 from cmd? I'm developing client server application which running on the port 3434 and also is binded on port 0.0.0.0. When I type in cmd netstat -an, I get this ...
8
votes
3answers
262 views
What do the numbers used in a IPV6 address mean?
I am trying to understand IPV6. I have a server with the following IPV6 address: 2607:f750:0:3f::f59.
I don't understand what the numbers mean. It looks totally different from an IPV4 address.
...
1
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1answer
137 views
Difference between TCP and IP tunnelling?
Can someone please explain in terms of the OSI (or TCP/IP) layers, what is the difference with what goes on when you tunnel IP or TCP, say over the ICMP protocol (although the latter doesnt really ...
0
votes
2answers
94 views
How do I test the maximum TCP/IP transfer rates of my computer?
In Delphi, I am writing client software for open source message brokers, and would like the transfer rates with a realistic upper limit of what can be achieved on my local computer, or between my ...
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votes
1answer
44 views
How does a file is delivered to destination? [closed]
If I send a file using TCP protocol to a destination in some other country how does it get delivered? For example - Looking at the basic OSI Model,
Application
Presentation
Session
Transport
Network
...
0
votes
0answers
182 views
How does SSL-VPN tunneling and encryption work?
I have a few questions on SSL-VPN (Tunnel, not portal version). Question 1 is probably the one I'd like answered the most, out of my four questions.
How exactly does SSL-VPN tunneling work (Feel ...
2
votes
1answer
60 views
SSL/TLS and VPN-SSL?
As I understand it, SSL/TLS is used when we visit a website using https. However, using this method only encrypts the data and not the IP address of the website we're requesting.
If you use a VPN ...
1
vote
1answer
161 views
Can IPSec (or any other VPN tunnel) hide your IP address while browsing?
Is there a VPN/tunnelling method which you can use to browse the web, but will also prevent somebody from seeing your IP address if they were sniffing the network?
I wasn't sure if the IP address ...
0
votes
0answers
96 views
ICMP Tunnelling IP vs Tunnelling TCP?
Could someone please explain the difference between tunnelling IP data using ICMP packets and tunnelling TCP data via ICMP?
Obviously I know this is going to be something relevant to the different ...
2
votes
1answer
157 views
Understanding ipconfig output in Windows
I use Windows 7 and am connected to a LAN. In cmd I typed ipconfig.
There were many headings reading "Tunnel adapter local area connections" (with 13/19/17 appended to it). What does this mean?
...
5
votes
1answer
144 views
Does TCP/UDP send file sequentially or randomnly?
Does TCP/UDP protocol always send or receive file packets sequentially? Would it possible to make a choice which data packets will be sent first using sockets API?
0
votes
2answers
129 views
TCP Window Scale
I am searching that, how can two sides determine which scale factor will be using? In syn packets we can give a scale factor and than when two sides have the any scale factor, we can understand that ...
1
vote
3answers
107 views
How will I know whether my laptop computer is being shared
How will I know whether my laptop computer is being shared through TCP and IP or not been shared? What command should I look or click through? When I click the button bar for Local Area Connection ...
2
votes
2answers
183 views
Do browsers create new TCP connections for each HTTP requests?
So I know that HTTP is basically just a text protocol over TCP, and that TCP is state / connection based. That means that the browser has to connect over TCP to a server before doing an HTTP request. ...
1
vote
1answer
122 views
Sending a file via TCP/UDP socket
I'm reading about TCP and UDP from a article. In the end what I understood is that UDP is faster than TCP but it is unreliable. So if I'm going to a send a file, If use UDP, would it
be faster than ...
2
votes
3answers
48 views
TCP/IP on the transport level
I'm trying to understand what happens when I send a packet using a socket on the transport level. Do all packets which leave my computer go first to a geographical location designated by my ISP? Then ...
