• IP addressing and subnetting

    Hello, Can some one help me with an easier way of calculating subnets and host per given IP address?

    Markmu5 pointsBadges:
  • iSeries NFS: Change from UDP to TCP

    We are running on V5R4 and attempting to mount (via NFS) an external file system (Data Domain 530) onto the iSeries. Even though on the surface it appears that the mount was successful; you cannot execute any type of read or write operation to the mount. After running a communications trace, it was...

    Iseries4215 pointsBadges:
  • Windows network problrem but not in all programs

    Hi, I have a PC that have network problems from windows. The PC can have acces to network when using programs almost any. I can reach my AS/400 using emulator or VB Programs I can print on network printers. It can send and receive mail (outlook expres), and get to the net using IE and a proxy...

    Jmthirion0 pointsBadges:
  • High latency, TCP window size, single or multi session

    Dear Gurus: The situation is between 2 place with high latency e.g. 60ms from China to Taiwan. The IPLC link is 20mbps, the test PC hase been tcp optimisation increase window size. If one FTP test session still can not reach for example 10%(vs 100Mbps LAN), 10Mbps, the provider say have to multiple...

    JJLee5 pointsBadges:
  • Determine TCP port used by a connection.

    We have an application that has our iSeries (AS/400) connect to a remote IP address and port. If we have to end the application and restart it (IPL, error, end/start subsystem) the iSeries keeps the connection open. After the application is restarted, the TCP connections show two connections to the...

    LHrabar95 pointsBadges:
  • Are TCP FINS a concern?

    i have seen a lot of tcpfins on my sonic wall firewall. When I look up the IP address the sites are not sites we are accessing. Is this something I can report as a crime or how do I address.

    Wilsey15 pointsBadges:
  • Maximum number of TCP connections on Windows Server 2008

    We're trying to run as many connections as possible in our server that's running on Windows Server 2008. To support our Comet-style application, it's written in C#. All the connections just need to be open (and stay open). From what we're looking at, we're limited to 65K of simultaneous open...

    ITKE351,300 pointsBadges:
  • Networking

    I have a question regarding domain identification of a computer. How does the domain determine the operating system of a computer on its network. Does it use the Registry or some other method?

    Bubbagump0 pointsBadges:
  • How and where does fragmentation happen?

    Say I have a data of 5000 bytes. Once it reaches layer 4 the TCP header will be added. as the data is large there will be 4 pieces of the data; so there will be 4 TCP headers one for each piece. Now the 4 pieces go to the layer 3 one by one. Will there be any function of Fragment Offset and...

    Pratyush19875 pointsBadges:
  • How can I determine the size of a packet?

    I have initiated a TCP connection for a HTTP request and response. Now after it was completed, I sent a request to the server for the HTTP packet (with a SYN flag set). The server responded with a ACK flag but when that finished, it sent a FIN flag. So my question is: How can I figure out the size...

    ITKE351,300 pointsBadges:
  • What’s the better option for my TCP server: Netty or Apache MINA?

    I currently have a high performance TCP server and I've come down to two options: Netty or Apache MINA. If your honest opinion, which way should I lean towards? Has anyone used either? If/so, what are the advantages and disadvantages to each. Thanks!

    ITKE351,300 pointsBadges:
  • Closing TCP and UDP ports using Windows command line

    Would anyone know of a way of closing a TCP or UDP socket for a single connection via the Windows command line? After doing some searching, many people said doing a manual page of NETSTAT or NETSH commands, which would monitor the ports. But I'm not looking to monitor, I'm looking to close/kill...

    ITKE351,300 pointsBadges:
  • What’s the complete definition for off_t type?

    I'm sending files from our client to the server using TCP. To end the mark of the file, I would like to send the file size before the actual data so I've been using the stat system call. Now I need to know how many actual bytes it occupies so I can read it correctly on the server. It's defined...

    ITKE351,300 pointsBadges:
  • Does a TCP send a SYN/ACK on every packet?

    I currently have a TCP server that always listens for an incoming client, then it sends one packet of data every single second. Bur I have a quick question: Does a SYN/ACK packet only get sent on initial connections, like this: SYN ACK DATA DATA DATA Or is it sent with every packet, like this: SYN...

    ITKE351,300 pointsBadges:
  • How to redirect TCP-traffic to Unix domain socket

    I have a legacy Linux application that's listening on a UNIX domain socket. Now, I'm trying to connect to it through a TCP-connection on a port (Port 1234). What would be the easiest way to bind the port and then redirect all incoming connections to the domain socket?

    ITKE351,300 pointsBadges:
  • Infiniband: How does IPoIB and TCP fit into it?

    I don't have a strong networking background but I've been doing some research on Infiniband. And I'm not quite sure how the concepts of IPoIB and TCP fit into it. Can someone explain to me how they work / what they do with Infiniband? Which way is better to go?

    ITKE351,300 pointsBadges:
  • Is it possible to use TCP and UDP on the same server?

    I understand this is a short question but it's very urgent. Can I use both TCP and UDP sockets on the same server? Particularly, would I be able to use the same port number too? Thanks!

    ITKE351,300 pointsBadges:
  • How to broadcast a message with UDP and TCP?

    I'm currently working on a .NET solution that runs completely inside a single network. So when a user makes a change to the system, I need to launch an announcement / have everyone hear it. Do you know of a way that I can broadcast a message like this (just like UDP) while keeping a guaranteed...

    ITKE351,300 pointsBadges:
  • Transmission of IP Packets in TCP

    I’ve read that IP packets can sometimes get lost in transmission and that TCP often requests retransmission of lost data.  How often are packets lost permanently?  What are the requirements for retransmission?  Are lost packets a security risk?

    ITKE351,300 pointsBadges:
  • How much faster is UDP than TCP?

    How much faster is UDP than TCP for a general protocol message exchange?

    ITKE351,300 pointsBadges:

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