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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One NIC suddenly stopped receiving most UDP broadcasts

Windows 10, Killer E3000 2.5GbE adapter, the latest driver. This started about a week ago without any changes that I can remember. I noticed it when Wake-On-Lan stopped working for this system. After ...
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Traceroute using UDP instead of ICMP?

I am playing a game named "Planetside 2" and since a few days many users including me have high ping issues on a specific server, while others have not. Therefore I wanted to try to ...
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Ping varies on different Ports with the same IP (Gaming related)?

I apologize if my question is "dumb" and not in the right category, I'm new here and I am genuinely curious about it. Recently, there have been numerous complaints from users of the game ...
Little Yuuta's user avatar
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Java : What calls could be executed behind the scene to open a UDP socket on port 7500?

Executing nestat shows the UDP protocol being accessed on port 7500 > netstat -naptu | grep 7500 udp 0 0 0.0.0.0:7500 0.0.0.0:* 13500/java udp ...
Unhandled Exception's user avatar
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Do some routers not support 2-way UDP communications? [closed]

I have Windows apps I've written to send commands (client) to a server app that returns some data via UDP. This works on a local LAN but when I put the server software at a data center, the server ...
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Ethernet connection loses upstream UDP and TCP packets but downstream UDP packets are fine

2 of my PCs are connected to my router like so: Both PCs' ethernet cables -> Switch -> ethernet cable -> ethernet socket -> ethernet cable from socket -> switch -> ethernet cable to ...
Molten Ice's user avatar
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UDP video stream from FFMPG to gstreamer

Hardware: Jetson AGX ORIN Software: Jetpack 5.0.2 I have been attempting to send a video file via UDP using ffmpeg: ffmpeg -stream_loop -1 -re -i test.ts -map 0 -c copy -preset ultrafast -f mpegts &...
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Only allowing specific IP for DHCP OFFER. Blocking all other IPs with Windows Firewall

I`m living in a dorm and somehow the university did not activate DHCP-Snooping on the switches. (Don't ask me why) As expected some non-tech-students plugged in their router and did not turn off their ...
OffByOne's user avatar
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How to force a match of "mark" of iptables to send its traffic to a TPROXY proxy?

I am trying to set up a transparent proxy that works with marked packets generated by a auxiliary program that wraps a process and mark its traffic with a firewall mark. What this setup does is to ...
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Overcoming client isolation for peer to peer audio streaming application

I am a student developer trying to develop an app that utilizes peer to peer audio streaming with UDP. The app's use case requires it to be used in public settings, specifically places like ...
Zachary Haslam's user avatar
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Why am I able to send UDP packet larger than my WIFI interface's MTU?

I have written a simple python program to send a UDP datagram. import socket client_socket = socket.socket(socket.AF_INET,socket.SOCK_DGRAM) host_name = socket.gethostname() host_ip = '1.2.3.4' print(...
Akash Karnatak's user avatar
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ffmpeg streaming UDP port is closed

I'm trying to use ffmpeg in order to transcode RTSP stream from CCTV to HLS stream so it could be accessed through a web server. ffmpeg used to stream video from CCTV with following command $ ffmpeg -...
BrilliantContract's user avatar
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Additional null bytes in DNS response packet

I am new user, so hello everybody. I am facing with below problem. Short description: I have device, which is connected to my ISP network. On that device I am running custom DNS service (it simply ...
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how to send multi video in udp protocol with in single ip/port?

According to the ffmpeg documentation using UDP protocol i need send multi input to local network in single IP/Port and received from VLC Player each video can choose with Program number and show it ! ...
user2687117's user avatar
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Why is my pc dropping this UDP packet?

I am using an FPGA to create IPv4/UDP packets. Below is what the packet looks like. Wireshark doesn't flag it for errors at all. I'm using a UDP checksum of 0x0000 (allowed for IPv4), the MAC/IP ...
stanri's user avatar
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Multicast from LAN to WAN

I'm trying to transmit a multicast stream over the WAN. I know the NAT cannot allow this. For this purpose, I tried to use one Raspberry with two Ethernet interfaces: The internal one and another one ...
Fabio Antonini's user avatar
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High UDP packet loss in Windows 11 but not Ubuntu

So I'm at a loss (pun intended). I'm seeing packet loss but only on the return leg (showing in iperf but not WinMTR or ping), and only in Windows 11. If I boot up into Ubuntu 22.04, I get minimal loss ...
Praemon's user avatar
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Encoding multiple live channels

I have a code working that encodes a UDP live channel into an HLS stream using m3u8 container. My question is, is there a way to simplify doing multiple channels, and ensure each is the same quality ...
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Issue in converting encrypted HLS with FFMPEG to UDP

We are looking for help in debugging a problem related to converting encrypted HLS to UDP output. If we download encrypted HLS content and then convert it to UDP, it works well. But if we directly ...
Namita Garg's user avatar
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WOL events during Linux runtime

I want to be able to react to Wake-On-Lan packets sent to my machine while it is already booted. I am able to turn my machine on using WOL, so the general system seems to work. My question now is: Is ...
Daniel D.'s user avatar
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How to convert HLS to UDP on FFmpeg or any other freeware?

What freeware can I use to convert an HLS playlist to a UDP stream? I tried FFmpeg on hls url to udp stream, which worked. I'm trying to find a freeware that can manage to do the same, but with ...
Alex Romero's user avatar
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Jitter/High Latency in Windows UDP Stream

I have been using UDP/WiFi to pipe data between an embedded device (ESP32 acting as a UDP server) and my Windows machine. My objective is to send as many short packets (8-64byte payloads) as ...
Ocanath's user avatar
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Wireshark: how to show UDP payload as text?

I have a device that broadcasts strings for debugging purposes, and i need to capture these UDP message and read the string. As you can see, i cannot read anything in the data.text column, while the ...
Parduz's user avatar
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is it possible to OpenVPN connection UDP through SSH tunnel?

Hi i search a lot on the Internet, especially in this site and read more post and articles about using OpenVPN connection through SSH tunnel but all tutorials about using TCP protocol to do that. in ...
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UDP client to listen to a multicast group/port without setting its own IP?

I have a small microcontroller device that I program via USB using Python. The device has an Ethernet connection, which can be configured either with DHCP or by manually setting the IP/Subnet via USB. ...
Miki's user avatar
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How to copy the parameters: program_id, program_num, pmt_pid, pcr_pid

Tell me, please, how to copy the following parameters: program_id, program_num, pmt_pid, pcr_pid from the input broadcast to the output. launch command: ffmpeg -loglevel verbose -re -fix_sub_duration ...
Alexander Ulanov's user avatar
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1 answer
335 views

Linux UDP server always show 127.0.0.1 as source IP

I'm trying to send UDP packet from a different loopback IP, say 127.0.0.100. There is no problem receiving the packet, while it always shows source IP of 127.0.0.1, and replies to there. Is there a ...
Haocheng's user avatar
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Mark only the udp traffic above a certain rate using iptables commands

I'm trying to achieve the following scenario: Using the iptables command, mark UDP traffic with destination port 1234 that passes through a Linux router with the recommended DSCP value for Expedited ...
Andres Pasca's user avatar
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Outgoing UDP packets don't reach the host from VM after certain time

I am trying to connect to my WireGuard VPN server that is inside a VirtualBox VM. I normally can connect without any problem. But when there isn't any connectivity for a certain time, I can't connect ...
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How to fix receiving UDP data on windows?

On a windows 10 machine I am running the following python code (3.10.11) to receive data on UDP port 9001 (without any VM running): sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) sock.bind((&...
Alex's user avatar
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Building multiview/mosaic of 4 input UDP streams and output to UDP stream

I was able to find a few examples online of using FFMPEG to build a 2x2 mosaic and have it working pretty well with four input UDP streams. The issue is when playing back, input 1, 2 and 3 stop ...
Daniel Rodriguez's user avatar
9 votes
1 answer
2k views

What prevents unsolicited internet packets from using up my monthly data limit?

My home router can use port-forwarding to act as a server, so I assume all internet packets sent with my public IP address as a destination are hitting it (and just not getting any response from my ...
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Download so many tiny files without archiving? [closed]

I want to implement a file server for a mobile app. This app requires so many tiny files to be downloaded from the server before it begins it's work And with updates from version to version some files ...
Shaheen Zahedi's user avatar
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427 views

Cannot receive UDP Broadcasts from different subnet addresses

I have setup an independent network (that is not connected to any other devices) with four devices each of which are on a slightly different subnet. There is just a hub with the four devices connected ...
iphaaw's user avatar
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Streaming Video over UDP with ffmpeg - h264 low latency

Hello fellow video codec enthousiasts, I'm curenntly working on a little system to play games in my living room using my office's computer. I'm trying to stream my screen through UDP with the lowest ...
MICmath's user avatar
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Ffmpeg gentle stop sending

Good day. I'm trying to do a simple video sending and receiving on two computers that are on the same network. Video simulates streaming (video conference for example). I want to use ffmpeg but have ...
Ли Шеньшунь's user avatar
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1 answer
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Do common OSes provide guarantees for IP fragment reassembly?

When sending UDP packets that exceed the PMTU, I'm told that the receiver will receive the packets in fragments. Does the network interface or OS of the receiver typically re-assemble the packets ...
Tom's user avatar
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Receiving UDP datagrams with gpsd

I'm in a network where NMEA datagrams with GPS data are broadcast on port 7150. Some seem to be broadcast to ports 7151 and 7152 as well. I checked that with iptraf and ncat, and the datagrams are ...
Ariser's user avatar
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Windows 10 firewall settings to receive UDP

I have UDP packets sent from a sensor device to a PC running Windows 10. The UDP traffic can be monitored using Wireshark, but only after completely disabling the Windows firewall are the UDP packets ...
Auto-Mark's user avatar
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UDP Packets Out of Order - What is the Likelihood in Uncongested Connection

We have two pieces of equipment in the same room communicating over a dedicated Ethernet LAN connection that is not shared by any other equipment. The communication protocol is UDP. I've been ...
Jim's user avatar
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UDP broadcast not working for one PC in the LAN

I have a program that broadcasts a simple UDP message periodically to manifest presence in the LAN. I have a laptop and a desktop PC both connected to the home router through Wifi. Both computers run ...
tuket's user avatar
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UDP Throughput Dramatically Lowered with MTU = 1500

I am using iperf3 version 3.5 under RHEL 8.0 to test a 10 Gbps point-to-point Ethernet connection with UDP. I have the MTU on both the source and destination NICs set to 1500. I invoke iperf3 as ...
Dave's user avatar
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Could you explain how instant messengers work over UDP in layman terms?

It is clear how TCP works: it is stateful, and routers can maintain state on endpoints' behalf. But it is not clear how it works for UDP. I imagine a not-so-hypothetical scenario: Several clients on a ...
user1749017's user avatar
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Piping data from ethernet to serial and back to ethernet doesn't work

CONCEPT VISUALIZED I'm trying to establish a bidirectional communication where ethernet UDP packets enter a linux system (suppose a Raspberry pi) from eth0 interface and piped into the UART hardware ...
zanglorion's user avatar
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TCP Vs UDP for VPN

What is the best protocol between UDP and TCPU for a VPN ? Many VPN providers are using UDP because of the speed gain, but what if it's used to connect to an Infrastructure to access Databases or ...
Izaya's user avatar
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OpenVpn doesn't connect via TCP

I created a OpenVpn server with TCP but client can't connect and receive this error Server poll timeout, trying next remote entry... But UDP works perfectly. This is config of server: local a.b.c.d ...
Pouya Poorrahman's user avatar
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Where could my packets be being blocked?

I am working on a video streaming project, I have issues when sending above a certain amount of traffic (something like 20 Mbs) I no longer receive any packets. Some quick facts: Windows task manager ...
thoxey's user avatar
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Strange limitation on single TCP/UDP connection with bandwidth limitation

I have a weird behaviour with connections from my house in Israel to my VPS or dedicated server in the EU. A single connection TCP/UDP is somehow limited to around 400kbps for some reason. When using ...
Dennis's user avatar
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Rsyslog: relay messages from UDP input only

Considering a docker container which receives logs on UDP and forwards to a central logging server using TLS, I was wondering if I could be satisfied with one queue or if I needed several. Indeed, ...
Ashlanfox's user avatar
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FFmpeg doesn't write to HLS output (udp multicast input)

This is the output from ffprobe. Input #0, mpegts, from 'udp://239.0.0.80:2345?localaddr=192.168.2.127': Duration: N/A, start: 39580.799967, bitrate: N/A Program 60 Metadata: ...
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