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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Max client TCP connections through a router

I've just been thinking about what the maximum number of client connections would be out of my home LAN to a single server on the internet. My home router is also NAT'ing the connections to convert ...
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308 views

Isolating one router port from the rest

I don't know much about TCP/IP and what I'm trying to do seems fairly basic to me but I can't seem to figure it out. I have one central router connecting to my ISP, and all computers connected to ...
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1answer
729 views

Where are my TIME_WAITs on Mac OS X?

No TIME_WAITs on Mac OS X Normally, when a TCP connection is closed, the socket on the side where close() is called first is left in the TIME_WAIT state. When one of the peers is a Mac OS X (Lion) ...
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1answer
227 views

Host doesn't send ACK-SYN packets for transparent proxy

I am setting up a transparent proxy using haproxy, the setup works without the 'source 0.0.0.0 usesrc client' line. When I add that line in, the endpoint is called from the original client's ip ...
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1answer
154 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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1answer
887 views

Multiple Homed Windows 2008 Server / Windows 7 Client

I have a small Windows 2008 network, with some Windows 7 clients. The clients are both laptops with docking stations and I would like them to communicate with the Windows 2008 server (for filesharing) ...
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1answer
675 views

Changing TCP/IP IPID sequence generation algorithm on Windows Server

a recent security review on a customers webserver yielded the following results: "[...] The system under test is using incremental ip ids. This means that every outgoing ip packet has an ...
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1answer
98 views

Could the IPG parameter in Robocopy cause TCP/IP packet problems if it is too high?

I need to throttle a robocopy transfer to limit bandwidth usage. It is already set to 1500 (/IPG:1500). I would like to increase this IPG to around 2000 (or more) in order to lower even more the ...
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1answer
729 views

Determing MSS value on Windows Server

In this Technet article about the MSS limitations of Windows Server 2008, it mentions: After analyzing the network trace collected on the source Windows 2008 Server, we found out that the remote ...
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1answer
69 views

RPC SERVER is unavailable

windows 2003 is getting this error. restart the machine or just the network connection fix the problem. date and time is the same one. tcp/ip is started and running remote registry is running the ...
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1answer
526 views

Long TCP/IP Connect time (20-40s) with Apache 2.4, mod_proxy_ajp, Tomcat 7.0.39 running on Windows Server 2008 R2

The initial connection to an Apache HTTP Server is taking a very long time (20-40s), but the subsequent connection is very fast (<50ms). I use Apache HTTP Server as a load balancer using ...
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244 views

SQL Server 2008 intermitent error 40 running parallel queries

Here's our setup : We are using Red Gate SQL Multi-Script to run queries on our ~1000 databases which reside on a single SQL Server 2008. SQL Multi Script can be configured to run queries in ...
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302 views

AFP / Apple Filling Protocol aka Netatalk access over Internet

I got a simple cloud server and thought it would be nice to have mac native afp Volumes accesss. Installed Netatalk and this seems to work pretty nice. No sensitive data or something but I don't ...
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1answer
443 views

Windows 2008 blocked TCP connection

I have a strange problem that I don't know how to diagnose: I have a small test application that tries to make a socket connection to an RTU on port 5001 (can't change this). The application works ...
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1answer
204 views

Detecting TCP/IP connection drop issues in my application

I have a desktop application which talks to a server using TCP/IP. It was working before but now we are running into an issue. The log message on the server shows that the socket is disconnected after ...
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1answer
109 views

connection established, waiting

I work for some administration. We are responsible for app development, I'm personnaly responsible for the software application servers (Glassfish) and there is a team which manages the infrastructure ...
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1answer
439 views

TCP/IP Printing Issue in Windows Server 2008

I am running Windows Server 2008 R2 Entrprise in a VM on my laptop. I am having problems setting up a printer. It's an HP PSC 1355 - drivers were installed automatically when I plugged the device into ...
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1answer
149 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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1answer
184 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
42 views

Firewall Connections fail to open under load

Problem : During High load , our applications are encountering errors : java.net.connection Time out. After some investigation , we found out that it was Firewall the root cause, but still don't know ...
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1answer
48 views

Routing to an external ip

I have a bunch of equipment (RTUs) that connect to a server to download data using a fixed ip and port. Due to change of ISP provider I need to change the ip of the server that handles these RTUs to ...
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1answer
163 views

Can a large number of network hardware interrupts cause a machine to be underutilized?

I don't know much about networking sorry. I'm building a client / server where the server streams a lot of data to the client and I'm trying to maximise throughput (through TCP). If I run both client ...
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0answers
1k views

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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24 views

An already acknowledged data sequence number is coming back as null byte repeatedly

There is a transaction processing server (TP-Server) to which my application (Client) connects to. We are seeing a strange packet sequence where in the TP-Server is sending a PUSH packet with a null ...
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44 views

Printer lpd daemon refuses print job if a command's new-line sent separately — bug?

I'm encountering some printer LPD daemons which work fine if the new-line is sent in the same packet as the command, but break if the new-line is sent in a separate packet. Is that a bug in these ...
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0answers
321 views

switch OFF syn cookies

We have several servers they have public IP's, but work together (one is with Load Balancer, orther with Apache Web server, other with MySQL and so on. Most of the ports are fire-walled, so only ...
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681 views

NIC Teaming , Multi-Homed, Active/Passive

I'm fairly new to NIC Teaming.. So I apologize if I’m not making any sense while describing this. I’ve, of course, set up plenty of simple Active/Active NIC teams for our servers without any issues ...
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775 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 ...
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41 views

sshd with port forwarding left connections to localhost without counterparty process

After temporary tunnel setup from X.X.X.X , from where I ran ssh -R 1089:localhost:1089 for several days, I have noticed this. I wonder what processes is 2494/sshd connected to, as no counterparty ...
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28 views

Early tear down of communication

I have an application which performs an LDAP search which works in one domain but not in the other, when analyzing the packets sent between the application server and the domain controller being ...
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0answers
112 views

Connection Timeout Issues - Solaris 11 SPARC

We're currently running some performance tests using Solaris 11 (SPARC) on some large hardware. The tests, which consist of sending SOAP requests (50kb per request), are running well up until we get ...
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0answers
172 views

Windows Server 2008 Enterprise - Print Server Role - TCP/IP Print Server Service Won't Start

I have a few Windows Server 2008 Enterprise edition Servers running Printer Server Roles. On these servers there are two system services: Print Spooler and TCP/IP Print Server (LPDSVC). The TCP/IP ...
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177 views

Lots of packets pruned from receive queue because of socket buffer overrun - reason to worry?

I know this question has been asked before, but maybe not in this particular context: I have a setup with a couple of MS2008R2 HyperVisor servers running a number of Ubuntu guests. Our webproxy runs ...
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253 views

SSH attempt keeps failing, syn+ack does not reach machine

1 0.000000 10.0.0.1 10.1.1.0 TCP 66 49285 > ssh [SYN] Seq=0 Win=8192 Len=0 MSS=1260 WS=256 SACK_PERM=1 2 0.001160 10.1.1.0 10.0.0.1 TCP 66 ssh > 49285 [SYN, ACK] Seq=0 ...
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0answers
58 views

Linux + OpenVPN + SNAT + Failure on client grab the reply to it's own generated traffic

Ok, I'm really desesperate I need to release an openvpn deploy to get rid of a dying server. On the subject: I installed OpenVPN with a routed interface (tun0) into a server with a public IP + 3 ...
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0answers
121 views

tcp recycle and retransmission

TCP recycle reduces TIME WAIT by reusing sockets. It avoids collision with older packets by storing timestamp and receives packets with greater TCP timestamp. What happens when the client retransmits ...
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0answers
91 views

50% Throughput on direct connect XCOPY transfer

I have two Dell Servers with multiple gigabit network ports each. These run a sync process using XCOPY. To improve throughput and reduce overall network impact, I have dedicated a connection on each ...