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Questions tagged [udp]

UDP stands for User Datagram Protocol. With UDP applications can send messages (datagrams) to other hosts on a network without requiring prior communications to set up special transmission channels or data paths.

Because UDP doesn't rely on handshaking to guarantee that packets arrive and in order it can be seen as an unreliable protocol, but for real time systems where acting on the data immediately is the most important consideration not having to wait for delayed packets is a distinct advantage.

UDP is just one communications protocol on the web. Others include:

  • Transmission Control Protocol (TCP)
  • Internet Control Message Protocol (ICMP)
  • Hypertext Transfer Protocol (HTTP)
  • Post Office Protocol (POP3)
  • File Transfer Protocol (FTP)
  • Internet Message Access Protocol (IMAP)

UDP on Wikipedia

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UDP packet loss on migrating from RHEL 5.7 to RHEL 6.8

We have an application which receives DTMF digit in the form of RTP (using UDP) packets. Earlier the server version was RHEL 5.7 and everything was working fine. Now since we migrated to RHEL 6.8 very often the packets are getting dropped. The…
soni
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Can't bind UDP socket but port is free

I've been struggling for a while now with this so maybe someone here is able to help me. I'm setting up a CS:GO server that's going to be running on port 27059. (This is a copy&paste from a working server, so I'm not posting config files used) When…
sysfiend
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Enable UDP protocol in Remote Desktop Connection

I have a computer to which I am connecting via RDP. However, using the default Windows applications (Remote Desktop Connection) probably will not use UDP port. By clicking the connection information getting only 'The quality of the connection to the…
Jake
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Can't change source IP address (to floating ip) for udp outgoing packages

I'm having trouble getting a cluster to work using pacemaker and corosync. Here is my hardware configuration: Network: 192.168.3.0/255.255.255.0 Gateway: 192.168.3.1 node1 (Ubuntu Server 12.04 x64) Static IP: 192.168.3.34 node2 (Ubuntu Server 12.04…
Dedalo
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Block an IP for UDP

I am under UDP flood attack. I used following protections to solve it: iptable IP ban: iptables -I INPUT -s 37.187.231.xxx -j DROP Tried another iptable syntax /sbin/iptables -I INPUT -i eth0 -s 37.187.231.xxx -j DROP Tried to limit the UDP…
Niky
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How to setup routing for UDP in AWS instance

I'm new to AWS and I'm wondering if any one could provide a guild/link on how to go about setting up, what I'm guessing is VPC, so that I can send UDP packets to and from my instance via my public IP. For example I'm trying right now on my local…
Nimjox
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tcpdump truncates to 1472 bytes useful data in UDP packets during the capture

I am writing an application which work with network. To perform some tests I need to reproduce the flow which I had a day before. But at the same time it is not allowed to stop the current working listener. I also cant rewrite existing program in…
Gavelock
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Reverse proxy for mixed tcp, udp, and http services

I'm building an architecture that will be hosting various services which individually maybe listening on a variable number of ports that could be mixed protocols. I want to map these services to unique subdomains and reverse proxy inbound requests…
kevzettler
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How do I add a broadcast IP to the loopback interface under os/x using ifconfig when my machine has no network?

I'm new to advanced network administration and I would like to do some testing with UDP broadcasting, so I need a broadcast address on my loopback interface. The machine is offline, in other words, there is no network. How can I accomplish that…
bandodeotarios
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Load Balancing UDP traffic transparently

Are there any products (preferably open source) that can load balance UDP packets transparently? We need to scale our syslog servers and require the original source IP be kept intact. Alternatively are there any other methods for scaling syslog…
AndyC
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Cat a file(raw) to UDP at specific bitrate

I'm looking for a way to transfer a file over UDP at an specific bitrate. I can use netcat for example like this: cat file | nc -u 192.168.x.x 5000 And I use a custom application to listen at port 5000 at client side. Is there any way to "cat a…
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Solaris doesn't know which MAC address to use to send an UDP multicast message

I have a pair of Solaris 10 boxes which are supposed to send multicast UDP packets to a group of hosts. One of them works just fine, whereas the other one does not. The problem with the second machine is that it doesn't know what MAC address to use…
Tadeusz A. Kadłubowski
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UDP Packet Size.. max, ping failing to 3G.. Recalcitrant software vendor

We have a network of 330 clients (Service Vans) connected via 3G to our central office. Currently these clients are connected via a small ruggedized 3G router that establishes the 3G connection and then an IPSec VPN tunnel (OpenSwan stack) A Windows…
Duncan_m
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Many clients on a wireless AP for UDP broadcast packets

I asked this question on StackOverflow and was directed over here, so I'd appreciate any advice. I'm deploying a smartphone application as part of a live music performance that depends on receiving UDP broadcast packets from a wireless access point.…
distorteddisco
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Does Windows XP automatically reassemble UDP fragments?

I've got a Windows application that receives and processes XML messages transmitted via UDP. The application collects the data using Windows "raw" sockets, so the entire layer 3 packet is visible. We've recently run across a problem that has me…
Matt Davis
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