TCP and IP are two important protocols used in networking today. Due to their importance, the Internet Protocol Suite is also commonly known as "TCP/IP"

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Help me understand Public/Private IP space and NAT

I just started working at a small-medium sized business after graduating school. So much of my knowledge is high level concepts without a lot of hands on. My understanding that according to rfc1918 ...
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2answers
699 views

How to cap network traffic using TCP/IP settings in Windows 7?

Is it possible to cap network traffic on a Windows 7 system so that it will not exceed a given throughput value? The BitTorrent client uTorrent is able to do this, but I am guessing that it's doing ...
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6answers
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Networking security and TCP/IP internals books/sites

I am searching for good books and articles about TCP/IP, mainly the security aspects of TCP/IP protocols. I have TCP/IP Illustrated and the TCP Guide, but they kinda lack on description of 'classic' ...
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2answers
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Why does the W2k3 TCP/IP stack gets corrupted?

I have a W2K3 server that every time an update restart the server, at boot the tcp/ip stack gets corrupted. This makes the server unable to do any kind of networking, and when i issue an ipconfig ...
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2answers
4k views

IIS7 hundreds of connections in CLOSE_WAIT

I have a .Net application on my IIS7 server it was working fine until I had to move it to another server. I moved the exact same code to the new server and I noticed that after some hours the ...
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4answers
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Where did TCP/IP Filtering go in Windows Server 2008?

I'm configuring our new Windows Server 2008 machine. In Windows Server 2003 we would enable TCP/IP Filtering on our network cards to only allow traffic on specific ports to get through. This was ...
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2answers
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Unix socket vs TCP/IP host:port

Could someone please describe to me the pros and cons of using a Unix socket file vs a tcp/ip localhost:port when setting up services on a server (Ubuntu, FWIW)? In this particular instance it's for ...
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1answer
469 views

Can't connect using TCP though UDP/ICMP works

My office changed IP addresses yesterday and since then we can't access any site hosted by mediatemple.net plus a couple of other sites. The office connection is ADSL (PPPoA). Both MT and my ISP ...
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1answer
150 views

No transmission via IP

I'm using netstat on Win XP to check protocol transmission details for TCP, IP, and ICMP. There is transmission only in TCP. No transmission in ICMP is understandable since it's for errors and I ...
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4answers
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Which is the default TCP connect timeout in Windows?

Which is the default TCP connect timeout in Windows? There is a registry key to configure it or it's set dynamically?
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2answers
307 views

capture traffic between boards at PC using wireshark

I have two board connected using ethernet interface by means of switch. I have a linux machine connected to the switch where I run wireshark. I assign same IP address range for both boards and the ...
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3answers
1k views

Windows Server 2008 R2 DNS Server not working?

I have a server running Windows Server 2008 R2 hosting a DNS server, exchange 2010 and is a domain controller. One computer on the network (and domain) can ping the server 25% of the time, also when I ...
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1answer
492 views

Linux TCP stack and network cards performance: packets per minute before drop?

how much TCP packets should come at 100/1000mbit network card (not an embedded Realtek's home solution) before the Linux kernel will become unable to process the NIC's buffer resulting in packet drop? ...
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2answers
173 views

How works tcp/ip package transport inside Linux OS? [closed]

How works tcp/ip package transport inside Linux OS?
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1answer
8k views

Maximum number of TCP clients in Windows 7?

I am running client load testing software for my server from a Windows 7 Enterprise box. The client box is able to get up to 16346 TCP connections out, and then it starts giving the error “An ...
3
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5answers
876 views

Is it possible to configure Nginx to send TCP keepalive?

On TCP connections held by NGinx, can it be configured to send TCP Keepalive (Not HTTP KeepAlive!)
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3answers
1k views

Slow and fluctuating server network speeds in a new data center

We have a server running Windows storage server 2003 with: - an FTP server and - VMware Server running a VDS with apache (vds runs windows web 2003) This is in a data center and we just switched to a ...
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1answer
1k views

Windows XP/7: custom routing for VPN connection

We are dealing with a badly configured VPN connection from a vendor, which set up the default gateway but doesn't route traffic anywhere beyond their VPN zone. I managed to do some ad-hoc routing to ...
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votes
1answer
1k views

TIME_WAIT consumes file descriptors?

In many TCPIP and Web tunning guide, recommends increasing max number of file descriptors when getting the error "Too many open files" but, i can't see TIME_WAIT in outputs of "lsof -i" Does anyone ...
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1answer
1k views

“Address already in use” error from socket bind, when ports are not being used [closed]

I can not bind (using C or python sockets) to any port in the range: 59969-60000 Using lsof, netstat and fuser I do not see any processes using these ports. Other ports such as 59900-59968 and ...
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2answers
7k views

Anyone know of a free flood ping utility for Windows? [closed]

Does anyone know of a free ping flood (some people call it flood ping) utility for Windows? I want something portable that I can install anywhere. I use ping flooding to primarily test for packet loss ...
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1answer
9k views

What is the maximum number of TCP connections I can have in Windows Server 2008?

I would like to have as many connections (single connections from many different clients) as humanly possible in a server running on Windows Server 2008, in order to support a Comet-style application. ...
13
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4answers
29k views

What does a DNS request look like?

I have seen what the text representation of an HTTP request is, but what does a DNS request look like? Where in the data is the location of the URL you are trying to locate? Also, how is the ...
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4answers
7k views

Diagnosing and debugging LAN congestion / connection issues

What are the top N tools / methodologies used to diagnose and repair network issues? Given a LAN, for example, where users are able to consistently ping an outside server, but any data intensive ...
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8answers
16k views

How can I add more than 255 machines to a single Class C network? [duplicate]

Possible Duplicate: How does Subnetting Work? I'm mainly a programmer. I have no idea beyond some basic theory when it comes to Networking/Administrating. My university feels that we ...
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votes
1answer
192 views

Need help getting StateServer to work, trying to decipher WireShark to figure out why

I'm using WireShark to try to figure out why I can't get my ASP.NET application (which is deployed to IIS6) to use a remote ASP.NET StateServer. For the record, StateServer works if my application is ...
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1answer
573 views

Moxa serial-to-ethernet connection problem

We have a Windows 2003 Server (32-bit) running in VMWare and connecting to 2 Moxa NPort 5450 serial-to-ethernet devices. We are experiencing a sporadic "disconnect" with the serial devices attached ...
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1answer
773 views

Linux TCP connection timeout length inconsistent

On the Linux boxes that host the application I work on, we've started seeing an issue where connection attempts against a port on a remote host are sometimes taking longer to come back. As a test, a ...
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2answers
248 views

Network Speed Limit

I have a nic "Local Network" and I would like to limit throughput speed for it to 1480kb/s and 208kb/s upload How can I do that?
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3answers
13k views

Serial port forwarding over TCP/IP (linux server)

I am looking for a way to use a remote serial port on a linux machine over LAN. The machine is running ubuntu 10.04 and I have a arduino board connected to it, that I would like to be able to ...
0
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1answer
229 views

Detect and aggregate packets sent to server per TCP port

Is there a way with Ubuntu 10.4LTS to detect and aggregate the number of packets transmitted over every port? In other words, I'd like a process to keep track of the number of packets sent to each ...
0
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1answer
3k views

xt_TCPMSS: bad length messages

I'm getting loads of messages like: Jun 23 10:24:20 awakening kernel: [ 1691.596823] xt_TCPMSS: bad length (1492 bytes) Jun 23 10:24:21 awakening kernel: [ 1692.663362] xt_TCPMSS: bad length (1448 ...
2
votes
3answers
646 views

Can ping server but no telnet or www

I have a NAS (iomega home media 1TB) plugged in router using 1Gb ethernet cable. Occasionally I lose access to it, I can ping it by static ip, nmap to see all open ports but can't telnet to it. Also ...
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1answer
1k views

TCP RST Reset Every 5 Minutes on Windows 2003 sp2

Recently I had a web developer come to me and ask why he was receiving connection errors in his app that was accessing a sql database. So, I went through my normal trouble shooting steps to isolate ...
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3answers
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What does the IP “192.168.1.1/24” indicate? [duplicate]

Possible Duplicate: Server Fault Wiki: How does Subnetting Work? I'm setting up rsync and I see this in the config file: hosts allow = 127.0.0.1 192.168.1.1/24 Does this indicate that ...
2
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0answers
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How to know the source of certain TCP traffic on AIX

We have two AIX boxes, one for production system and another for testing. both systems are running ATM machine switches, where the ATM device is connected via TCP socket. we had an issue on ...
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votes
2answers
2k views

How to get a service to listen on port 80 on Windows Server 2003

I've coded a custom windows service that listens on TCP port 80 but when I try to install it on a Windows Server 2003 machine it fails to start because some other service is already listening on that ...
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2answers
508 views

Static IP for dynamic IP

I have a dynamic IP address. I would like to have a static IP, but Virgin Media don't allow static IPs for residential broadband services, even if you ask them really nicely and offer to pay for it ...
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2answers
2k views

use of tcp_delack_min on redhat linux (kernel 2.6.18)

we're moving from Solaris to Redhat Linux, and trying to duplicate our low-latency setup, that, on solaris, includes the ndd settings related to TCP NO DELAY, and NAGLE ALGORITHM. I got the impression ...
3
votes
1answer
857 views

Solaris TCP stack tuning

We have a large web project (about 2-3k requests per second), using haproxy (http://haproxy.1wt.eu/) as a frontend and load balancer between the java application servers. The frontend (haproxy) is ...
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1answer
1k views

How can I make WinXP bind to ports other than 1025-5000 for outgoing TCP connections?

(I originally posted a similar question on StackOverflow but readers recommended I post here instead) When you create outgoing TCP connections, most applications let the operating system choose which ...
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votes
6answers
1k views

Looking for an open source real-time network analysis program

Can somebody recommend an open source real-time network analysis program? What I'm looking for the program to do is display a graph of bandwidth usage by IP within our internal network that can ...
2
votes
2answers
843 views

Recommendation for a non-standard SSL port

On our server I have a single IP, and need to host 2 different SSL sites. Sites have different owners so have different SSL certificates, and can't share the same certificate with SAN. So as a last ...
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votes
3answers
2k views

Can I make TCP/IP session to run less than 60 seconds?

Our server is overloaded with TCP/IP sessions, we have 1200 - 1500 of them. Most of them are hanging in TIME_OUT state. It turns out that a connection in TIME_OUT state occupies a socket until 60 ...
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votes
3answers
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wireshark http POST

I would like to have a http POST request method CAPTURE filter. I know it is easy to do it by display filter http.request.method==POST but I need tcpdump compatible. I wrote tcp dst port 80 and ...
2
votes
1answer
6k views

How to set the preferred network interface in linux

I have my network set up like this. http://docs.google.com/Doc?docid=0AZ1YxuLE4djaZGhqN2s1NmRfMjhjNjc0Ym1meg&hl=en In words: I have a machine (Calcium, running Arch Linux) that has two network ...
2
votes
3answers
4k views

Shaping outbound Traffic to Control Download Speeds with Linux

I have a situation where a server makes lots of requests from big webservers all at the same time. Currently, I have not control over the amount of requests or the rate of the requests from the ...
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vote
0answers
810 views

Network Transfer Rate on SMB/FTP

We're trying to optimise our network transfer rate from the client PCs to the file server, but having no luck. If I run an iperf test between a client PC (Windows XP) and our server (Linux) with a ...
2
votes
1answer
157 views

NetDiag + TCP Blocking?

We are facing some issue with the sharepoint 2007 timer jobs everyday at a specific time, so decide to track the tcp blocking informartion during those hours using NetDiag tool. We are not able to ...
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3answers
2k views

Cannot ping host stale ARP cache?

I am having a strange issue with a Debian (Lenny/Linux 2.6.26-2-amd64) that has been driving me nuts. On some machines within my network I can ping the host in question just fine, other times I have ...