• How do two computers find each other over the Internet?

    We have two computers that are attached to the Internet that know nothing of each other beforehand. Is it possible for one computer to be able to broadcast a message so the second computer receives it and responds? I already know that UDP broadcast exists, but aren't those filtered by the ISP...

    ITKE346,080 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...

    ITKE346,080 pointsBadges:
  • What’s the biggest UDP packet I can send?

    I'm looking for information on what the biggest UDP packet I can send to another computer is without fragmentation. I know the size is known as the MTU and several routers and modems will have different MTUs between computers. I also know that TCP implementation in Microsoft Windows finds the...

    ITKE346,080 pointsBadges:
  • What is the maximum size UDP packet that can be sent?

    A question about sending UDP packets.  From what I’ve read, the maximum size UDP packet that can be sent is 512 bytes.  However, being that MTU can carry 576 bytes, and an IPv4 header is 20 bytes, and the UDP header 8 bytes. Aren’t there 548 bytes still available? Therefore,is it possible to...

    ITKE346,080 pointsBadges:
  • What happens when the DNS names exceed the maximum UDP packet size?

    A DNS uses UDP packet to resolve IP addresses. What happens when the DNS names to be looked up exceeds 576 bytes (the maximum UDP packet size)? Can it be sent in two packets?

    NetworkingATE1,545 pointsBadges:
  • Meaning: DHCP using UDP as Transport Layer

    Hi, I am learning DHCP protocols and in fact a beginner to network domain. I have a very basic question. Qn : What is the meaning of "DHCP uses UDP as transport protocol" ? ( or to be generic, what does it mean that x protocol is sent over y protocol) Appreciate your valuable time. thanks Sandeep

    Chik5 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!

    ITKE346,080 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...

    ITKE346,080 pointsBadges:
  • How to find packet sent address

    I need to create an automated response so that when I receive a UDP packet for a sender, that sender receives the address it was sent from. I tried using the recvform, but that only brings up the address of the sender, not the the address from which the packet was sent.

    ITKE346,080 pointsBadges:
  • Sending UDP packets to a different subnet

    Can UDP broadcast packets be sent to a different subnet through a router? I’m curious because I need to find certain devices on the network, and some of them may be on different subnets.

    ITKE346,080 pointsBadges:
  • How much faster is UDP than TCP?

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

    ITKE346,080 pointsBadges:
  • Why would someone use UDP instead of TCP?

    Aside from speed, why would someone use UDP instead of TCP? From what I understand, UDP can lose packets, whereas TCP cannot. What other advantages does UDP offer?

    ITKE346,080 pointsBadges:
  • Global communication network without the transport layer

    Is it feasible to have a global communication network without the transport later? Thanks!

    ITKE346,080 pointsBadges:
  • Packet Sniffer

    I need to know about packet sniffer with a clear demo and how the packets are transmitted in TCP and UDP.

    ITKE346,080 pointsBadges:
  • Wake on LAN / Magic Packet broadcast doesnt work through PPTP

    Hi, I have a network, where I want to use WOL from a remote PC. It works when I send a packet from inside the network (or on the server). If I connect via PPTP from a remote Windows XP PC, I can't wake up the PC on the LAN. I suspect the broadcast packet doesn't reach the LAN. The PPTP connection...

    Benbje0 pointsBadges:
  • Analysis and prevention of Flooding attack by using TCP/IP or UDP programs or any other software

    Hi, I'm doing my final year project on flooding attack. In this, I want to do analysis and then prevention of flooding attack with the parameters known as 1. Packet size 2. Rate of transmission 3. Bandwidth What do I do from this? Please help me.

    Classes10 pointsBadges:
  • UDP datagram don’t get the server

    I have implemented with c++, two small apps: an UDP client and an UDP server I place client in same machine than server. I start server, I start client, and I send data from client to 127.0.0.1... server receives OK now i do ipconfig and i get my local IP is 192.168.1.8 so I repeat by sending to...

    Thetonatiuh55 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:
  • Don’t Fragment bit

    Could anybody please explain me about the data transfer when Don't fragment bit is set and incoming protocol is TCP/UDP?

    Techy001340 pointsBadges:
  • The DNS server could not bind a User Datagram Protocol (UDP) socket to 192.168.0.4.

    i have two dns servers on our network, (windows server 2003 standard); (a) the dns server1, (has both forward lookup and reverse lookup zones configured), to which all hosts on the network are pointed, this same server has forwarders configured, pointing to our dns server2.  (b) the dns server2...

    2temmy5 pointsBadges:

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