I'm total newbie at tcp/ip and I was experimenting with Wireshark.
What this mean:
1824 578.194204 xxx.xxx.xxx.xxx yyy.yyy.yyy.yyy UDP Source port: 17500 Destination port: 17500
In data I can see that my user pc name is sent (happily it's a generic name): does this mean someone is trying to hack my pc ?
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 port. So far I've disabled the IIS Admin service and the HTTP SSL service but no luck.
When I run netstat -a -n -o | findstr 0.0:80 it gives me the…
Recently, my Internet slowed down drastically. I downloaded a tool to see the TCP/IP connections from my Vista computer. I found out that a lot TCP/IP connections are being connected to 212.192.255.240 through SVCHost. It seems that it is trying to connect to different ports.
I think that my computer is being infected with some kind of malware…
www.superyoink.de is my clients' website. I can access it from any machine except my development one.
If I ping it on my development machine, I get 80.67.28.107 - this is wrong.
My laptop, next to me, is able to resolve it correctly.
I have tried putting correct address into hosts like so:
93.187.232.191 www.superyoink.de
Still resolves to…
Scenario:
I am implementing failed over for a network node, so my idea is to make the master node listens on a broadcast ip address and port. If the master node fails, another failover node will start listening on this broadcast address (and port) and take over.
Question:
My concern is that I will be using a broadcast IP address just for a…
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 second time-out is elapsed.
The problem is that the server gets unresponsive and many clients are not getting served.
I have made a simple test:…
I'm total newbie at tcp/ip and I was experimenting with Wireshark.
What this mean:
1824 578.194204 xxx.xxx.xxx.xxx yyy.yyy.yyy.yyy UDP Source port: 17500 Destination port: 17500
In data I can see that my user pc name is sent (happily it's a generic name): does this mean someone is trying to hack my pc ?
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 like to wake up someday and have
my www docs rm-rfed by some kid h4x0r.
Q1: Is afp encrypted?
Q2: How can I make it (semi)secure?
Q3: Does…
I was experiencing some issues with my connection while playing online and I tried to optimize it by running TCP optimizer on my PC (Windows 7 64bit professional). I thought maybe the situation could improve.
but it didn't.
actually, I now get an extremely slow page loading time, probably due to a very low RWIN value of 1024.
I understand…
We have two scanners in our branch office which upload images to the head office via FTP. In the last week, both scanners have started delivering a lot of corrupted images.
I suspect that the problem may be with the WAN link, and that TCP might not be detecting/correcting all errors. Is there any software for Windows that allows me to…
I am using a fast ethernet of 100 Mbps, whose frame size is less than 1500 bytes (1472 bytes for payload as per my textbook). In that, I was able to send and receive a UDP packet of message size 65507 bytes, which means the packet size was 65507 + 20 (IP Header) + 8 (UDP Header) = 65535.
If the frame's payload size itself is maximum…
Hello.
My problem started when Yahoo Messenger stopped connecting. I've tried to see if Internet Explorer was working but will not load any page. The diagnostics of Internet Explorer says that is something wrong with my dns(using just ip of google or yahoo or my local webserver was not working). I use Windows 7 and at the moment…
What resources (books, Web pages etc) exist out there that:
explain the causes of latency in TCP/IP-over-Ethernet networks;
mention tools for looking out for things that cause latency (e.g. certain entries in netstat -s);
suggest ways to tweak the Linux TCP stack to reduce TCP latency (Nagle, socket buffers etc).
The closest…
This is a Canonical Question about IPv4 Subnets
How does Subnetting Work, and How do you do it by hand or in your head? Can someone explain both conceptually and with several examples? Server Fault gets lots of subnetting homework questions, so we could use an answer to point them to on Server Fault itself.
What is…
I want to use Winpcap to capture all network packets going through a Gigabit NIC of a server.
Assuming that I am able to utilize the network link up to 100%, the maximum network speed is 1000Mbps. If we exclude the TCP/IP headers, the maximum TCP data rate should be roughly 940Mbps.
Let's say I send a 1GB file through…
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. The application is written in C#. The connections will not be chatty, they just need to be open (and stay open). Buying…
I'm sniffing my current connection, but I have second computer linked to mine with ICS. And my app makes no difference between the two. How can I detect the second one and filter it?
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 try to ping it's own hostname it also does not work. However another computer that is on the domain can ping it fine,…
I am trying to tune a high message traffic system running on Solaris. The architecture is a large number (600) of clients which connect via TCP to a big Solaris server and then send/receive relatively small messages (.5 to 1K payload) at high rates. The goal is to minimize the latency of each message processed. I…
Hey guys,
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 resort I have modified the web application to give the ability to use a specified port for secure pages.…
Hi all! I want to deny my internet connection's download properties for all port. I mean i want to make just upload. is it possible? Thank you very much for your help, already now.
I am new to Windows networking. When people talk about TCP tuning on Windows platform, they always mention about TCP Window Size. I am wondering whether Windows uses the concept of "Socket Buffer Size"?
On Windows XP, the TCP window size is fixed. We can set it using the TCPWindowSize registry value. How about…