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.

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Connection to game and communication servers fails in a specific WLAN

Last year I moved to a different city and in the WLAN of my shared appartment my electronic devices can't connect to game servers or most audio-communication servers. The "normal" use of the ...
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Protocol on Wireshark says LLC

enter image description here A theoretical question may be. I have created UDP traffic across my network involving client and Server. When i ping the server and monitor the data using wireshark, it ...
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Chrome reports UDP port blocked but netcat can connect

I am using Chrome browser 84.0.4147.89 (64-bit) and when I run the Chrome Connectivity Diagnostics I get the following error log for UDP port 19302-19309. SUMMARY Test Name: Hangouts Connectivity ...
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real time stream udp ts mpeg2 to localhost rtsp mp4

I am with a volunteer emergency service organization and a novice ffmpeg user. We would like to transcode & stream a real time udp ts mpeg2 Ethernet feed to my PC localhost via rtsp mp4. From the ...
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WireGuard blocked - apparently a wider UDP issue

WireGuard is refusing to connect, I've tried running it on 2 different VPS providers (with my PC as the client) and it just doesn't work. There are some commonalities which I noticed: On both ...
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393 views

buffer deadlock prevented error from RTSP streaming over UDP

I have an issue to view RTSP streaming over UDP in the open VPN connection. Our project is to integrate 360 degree IP camera in unity system. And we want to get the UDP streaming rather than TCP to ...
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65 views

How to ensure mobile-PC discovery in LAN?

I am developing a game that uses a PC as a monitor and a mobile phone as a gesture detector. Both devices communicate using UDP on the same local network (mostly Wi-Fi). First, the PC creates a ...
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27 views

Network subnet completely blocked by laptop (external ethernet dongle)

This has now happened to me multiple times. In the most recent outage the Internet went down (the cable modem started returning a local IP address instead of the external one) which I don't believe ...
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ssh tunnel to forward ports to a virtual machine running in the cloud

I have got a network device (running linux, I have got no shell access to it) which is connected to my local network. In addition to this I do have a Windows application running which interacts with ...
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replay pcap with tcpreplay through internet

I'm trying to replay a PCAP file recorded from my first server online. In order to make some tests, I successfully changed the IP source and destination, mac source and destination. The PCAP file ...
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Is a NAT Punch through the NAT Loopback possible?

Lets say three devices behind the same NAT. A server, two clients. The clients send packages to the server through a port forward in the router and receive the socket-adresses of each other as a ...
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How does DHCP OFFER broadcast work?

I am trying to understand the concept of DHCP relay agents and was reading this article. In section 3.2, talking about DHCP OFFER, it mentions that the DHCP relay agent replaces the destination ip to ...
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What address type do DNS queries use?

I was reading this thread and it was mentioned that DNS servers use anycast address. I have also heard that there is something called Unicast DNS as well. So, my question is what type of addresses ...
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Is UDP full duplex or half duplex?

Can someone tell me if UDP is simplex/half duplex/full duplex? I read conflicting answers here and here. Would be great if someone can clarify this for me.
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How do I change the source IP of NAT-locally forwarded packets to the public IP of the forwarding router?

I have a typical consumer router(netgear) running DD-WRT. It has port forwarding set up to a server in the private network. I can send UDP-packets to that server, by using the public ip/DDNS address ...
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178 views

How does DHCP handle multiple scopes in the same subnet

We are studying DHCP in our networking class and I have a Virtual Box in which I have set up 2 VMs - one of them is a Windows server and other is a Windows 10 workstation. I have added the DHCP ...
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Why are DHCP messages broadcast?

I am learning DHCP in my networking class and as a part of my research, I was watching the following video: https://www.youtube.com/watch?v=0UvLRVlPx6A So in the Wireshark capture in the above video ...
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Why do most application protocols have two ports assigned?

So I am trying to learn about the application layer in the OSI model and when I go to the IANA website, I notice that most of the well known protocols have same port assigned for TCP and UDP. For ...
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137 views

Displaying UDP Multicast Rawvideo Stream

I have a problem while trying to capture the raw video over UDP. In my setup, I stream the webcam with FFmpeg (command line) via UDP, on the client side I use Java OpenCV, the capture line; ...
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297 views

Cannot play video stream from FFMPEG to VLC

I'm trying to stream my local webcam using FFMPEG. For test purposes, I'm doing this locally and try to open the stream using VLC (3.0.8, Windows 10). This is how I stream from FFMPEG: ffmpeg -f ...
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UDP/firewall forwarding

So I have a raspberry pi that is sharing internet via ethernet to an older computer without wifi. I want to be able to access the computer from anywhere via vpn and the computer to access anything ...
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125 views

OBS UDP to remote

I'm using OBS to stream, but I recently ran into an issue: what if I have, say 4 different streams (of which one is my own), each from a computer in another network, but I want to combine them. I ...
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190 views

SSH Tunnel + Socat UDP + Unicast + Multicast

I am trying to communicate from a machine LOCAL (sitting at home) with a scientific instrument (SCIENTIFIC, IP=192.168.1.109) which sits in a remote network along with a raspberry (SERVER). SCIENTIFIC ...
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/etc/nfs.conf equivalent for Debian/Ubuntu

What is the reason for /etc/nfs.conf not in Debian/Ubuntu? There are /etc/default/nfs-kernel-server and /etc/default/nfs-common, but they aren't the same. They're used by /usr/lib/systemd/scripts/nfs-...
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FFMPEG: How do I output appended log files for Audio (silencedetect) and Video (blackdetect) Monitoring of a UDP Stream (not an MP4 file)

I am outputting log files for both audio and video monitoring for a UDP stream showing silencedetect and blackdetect. I have working code for both however I can't seem to get grep to filter only ...
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using udpcast over the internet

can I use udpcast-receiver to send file from my office in one country to a different branch located in another country? if so what options should I use? I tried nc - netcat with tcp it works but with ...
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How to remotely tell a Mac to sleep without using SSH?

I am needing assistance in getting a Mac to go to sleep without the usage of SSH. Almost any other method is acceptable. Backstory: Product Salesman and Project Manger sold a thing without asking ...
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171 views

Udp packages bigger than 1472 are not being received

I have a c# client app. It sends data to my server using UDP. However, this stops working after I upgrade to Windows 2019 Server. the reason it stopped working is contained in this link: https://...
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106 views

Need to Specify source for UDP video stream, what is the syntax?

I am trying to add to my IPTV box a m3u list with UDP streams but I have to specify the source IP in order for it to run. With VLC it works with this syntax: udp://[sourceIP]:2000@[MulticatsIP]:2000 ...
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221 views

Convert Received TCP packets to UDP and forward those packet

I have a service that listens on a TCP port and communicates with a peripheral. I'd like to forward the received packets by the service through UDP to an another computer. I don't need handshake with ...
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Creating an isolated network with internet access for UDP streaming

I'm trying to set up a video streaming system for a small organization. Of the many challenges, one is getting audio to sync with video. In order to accomplish this, I'm using two networked computers....
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What is corel doing on my udp connections for Chrome?

I have a weird mc.corel.com address lingering in Chrome and some parts of svchost processes, what is going on?
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linux nc (netcat) UDP Connection refused

I faced with some strange nc behavior. It works well with TCP when on one host I do: nc -tlp 31337 and on the other one: nc 14.0.0.1 31337 So there can be some data exchange. But when I do: nc -...
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430 views

SSH port forwarding a UDP port from Windows

I discovered the possibility of forwarding ports through SSH after I sticked up with port forwarding which didn't work out because my provider has DS Lite. Using ssh -R 8080:localhost:8080 <...
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102 views

VLC UDP Stream - reception not possible on other devices in the network

I have installed the VLC Player on my MacBook Pro and would like to use it to stream videos to my local network. Therefore I go to File -> Conversion/Stream in VLC, select the file and set the ...
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UDP IP Spoofing

I have a Ubuntu VPS in Singapore region and I have players who are going to play in my Indian Tournament. My Indian server accepts only Indian traffic to protect from DDoS. My players want to play ...
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ffmpeg - copy http stream to multicast udp stream

i try to "copy" many tvheadend http streams to multicast udp streams the result should contain all streams: video, audio's and subtitels (especially epg) ...and at best without transcoding my ...
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100 views

How to fix the outerscope and shadowing the name

Can anyone please explain how to prevent from getting these errors in PyCharm? Also, can anyone please explain the difference between send to and send in simple words and its syntax? '**rdt**' is a ...
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55 views

Delay in video transmission UDP

There is no synchronization problem, but the image appears 5-8 seconds after the sound, how can I solve it? ffmpeg -hwaccel_device 0 -hwaccel cuvid -c:v h264_cuvid -deint 1 -y -i http://192.168.5.100:...
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SNMP agent not responding to external connections on ubuntu 16

I'm trying to set up snmp on ubuntu 16, and I can see it is listening on port 161 by using command: $ sudo netstat -nlpu|grep snmp udp 0 0 0.0.0.0:161 0.0.0.0:* ...
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Internet goes down when I connect the UDP Streaming into the Switch

Team, When I connect the PC-1 ( within the same LAN) I have internet Drop issue. The IP address of the PC-1 is IP (192.168.86.119) Subnet Mask (255.255.255.0) Multicast UDP (238.1.1.1) ...
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202 views

Problems with UDP protocol in Matlab Simulink

I will go straight to the point, I am working with Matlab 2017b on a standard computer to which I installed simulink real-time packets, in this there are two blocks called "Packet Output" (3) and "...
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Port unreachable trying to stream UDP movie with VLC (MacBook to iPhone)

I am trying to stream a movie with VLC from my MacBook (192.168.178.23) to my iPhone (192.168.178.26) within my local network with UDP on the port 1234. So I open the streaming window and enter the IP ...
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Receive UDP packets from multiple broadcast servers

I have two sensors which broadcast their data using UDP. I configured them to use different ports. If I connect only one sensor, I receive the packets using nc -ul port without any trouble. If I ...
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UDP between A and B only works if B sends packet first

I have two separate linux computers, A and B, that need to communicate via UDP on port 3000. They are each behind a different router, and I have port forwarding rules set up on each router. For some ...
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171 views

dvblast rtp stream to UDP multicast

I've used DVBLink IPTV Server for some time to receive IPTV via RTP and broadcast it to LAN via UDP multicast. DVBLink has discontinued this software in favour of TVMosaic, which happens to not ...
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Getting udp input from particular network interface

i have 2 lan port one is connected with internet and another one is connected with data ... Data has my udp data but when i want to get my udp data it hangs does not show any data ... I want to ...
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119 views

Why Imx6q(Embedded Linux Device) ethernet communication is too slow?

I have tried several methods to test the ethernet communication of the Imx6 card. 1) When I ping in my computer from IMX6, the ping does not reach the IMX6. But when I ping to imx6 from the computer, ...
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Send UDP packet and listen for replies

I have a program with a Send an UDP packet to port xyz and I will reply with some UDP packets! interface. I've found out that I can send a UDP packet with echo <packetContent> | socat - udp:&...
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RTP Streaming using VLC - Getting huge transmit UDP packet loss on my PC - why?

I am getting strange problems on my Windows 7 PC: I have tried to setup VLC media player to stream audio through RTP, however I am getting huge outbound UDP packet lost. After some debugging, I ...

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