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.

learn more… | top users | synonyms

0
votes
0answers
3k views

RTP input stream on VLC

I'm trying to play on VLC a RTP input stream coming from the port 9954, UDP socket. So, I launch VLC on the console with this command: vlc -vvv rtp://:@9954. VLC appears, but no media is played. The ...
2
votes
2answers
567 views

Force DNS resolution to use TCP

My Comcast internet connection has been giving problems in DNS resolution, and I am guessing the reason is a probably broken or limited UDP. I am currently working around it by tunneling over TCP ...
0
votes
2answers
985 views

Wake On Lan will not work no matter what

I have been having the most frustrating time trying to get my desktop computer to wake up from a magic packet. The worst part is, I am almost 100% sure that I have had it working on this computer in ...
1
vote
2answers
843 views

TCP/UDP hole punching from and to the same NAT network

I was wondering if tcp/udp hole punching would still work when you are in the same network (behind a NAT), and what the packet's path would be. What happens when using hole punching on the same ...
0
votes
1answer
179 views

UDP client behaving differently for wifi router

I have a setup like, main router is connected to modem(ISP), I have connected one wifi router to main router, and another wifi router to above wifi router, so have 3 levels of routers. Now I connected ...
0
votes
1answer
1k views

Multiple connection attempts per minute on udp port 1024 - What might be the cause?

Here's a small sample from my firewall log: Sep 24 14:51:04 server Shorewall:net2fw:DROP: IN=eth0 OUT= MAC=44:87:fc:8a:f2:c3:00:04:ed:dd:e6:4a:08:00 SRC=213.5.110.105 DST=10.1.1.3 LEN=131 TOS=00 ...
4
votes
2answers
3k views

DHCP: broadcast flag

I'm looking at some DHCP packets through wireshark. I notice that in the bootp section, there is a broadcast flag. However, the dest IP is 255.255.255.255. Isn't it enough to indicate that it's ...
1
vote
1answer
346 views

A port scanner or proxy server for testing UDP (or all other) protocols on particular (or all) ports

I have a problem GPS localizer (TK102), that is probably sending out data over UDP, but my server isn't receiving it (while it does from other clients, using UDP and this IP/port). I asked on ...
0
votes
1answer
724 views

How to transfer data between two networks efficiently

I would like to transfer files between two places over the internet. Right now I have a VPN and I am able to browse, download and transfer files. So my question is not really how to transfer the ...
1
vote
1answer
259 views

Log is full of “stealth mode connection attempt”s

My daily log is full of messages like: 8/25/12 8:27:01.385 PM Firewall: Stealth Mode connection attempt to UDP 192.168.1.101:40959 from 109.254.109.20:1098 where 192.168.1.101 is IP of my mac. ...
0
votes
1answer
258 views

Do asp.net windows server based server uses any udp packets [closed]

I am an indie browser mmorpg game developer. I am not using any streaming. Everything is http , web service or ftp. Now my question is does my server use any UDP packets? I just recently got ddos ...
2
votes
0answers
392 views

Can I get UDP Hole Punching with (any) VNC client to get around the local firewall/router?

I don't have access to the local internet router, so I'm unable to setup port forwarding on my lan connection. I'm just trying to find out if there is any way for me to get around my local router ...
6
votes
3answers
3k views

NAT and UDP replies

Sanity check please. If I send UDP packets from Machine A behind a NAT to Machine B's port N, where Machine B is outside the NAT (elsewhere on the Internet), can I reasonably expect that NAT to pass ...
0
votes
2answers
2k views

My Mac keeps broadcasting UDP packets to 255.255.255.255:2008

The source port changes rapidly, from 49xxx to 6xxxx. I tried to use lsof -i udp, and see there's process named mDNSRespo which holds a lot of udp sockets. However, none of these sockets' ports are of ...
0
votes
3answers
2k views

How do I make netcat receive UDP packets from any host?

Is there a way to make netcat receive UDP packets from any ip:port? I don't want it to bind to a specific host as the first packet comes. I can consider alternatives, but they have to be bash ...
1
vote
2answers
2k views

how to forward and broadcast UDP packet from one network to another?

I want to forward udp packets broadcasted in one network to another. how can i do this ? I know we can put router in between and router can forward, but router can only unicast not broadcast.
2
votes
1answer
1k views

Is there Windows utility to find out which process is sending UDP packets?

The problem is: Using Microsoft Network Monitor 3.4, I can know which process created a TCP connection, but Microsoft Network Monitor cannot report which process sends UDP packets. I'm a network ...
2
votes
0answers
212 views

in wireshark how to know if packet was send to vpn or to internet?

Thanks to my previous question when vpn is connected intenet is not accessible I have configured VPN connection so I can use internet at the same time. Right now I write this post and I'm connected to ...
1
vote
2answers
4k views

How to determine which process sends UDP packets periodically to an IP address?

I tried looping with netstat and but the packets are small and not frequent so do not get caught (can still see them with tcpdump). Need to know which process sends those packets.
2
votes
0answers
223 views

Mounting an NFS share with udp or mntudp options

According to the documentation of NFS client on Mac OS X 10.7 user can specify following options: udp Use UDP transport protocol. and mntudp Force the mount protocol to use UDP transport, ...
0
votes
2answers
1k views

Use Nmap to send arbitrary data from spoofed address/port

For testing the error and timeout handling of a custom SIP stack, it is sometimes useful to send UDP packets from multiple source addresses (even ones that are assigned to other hosts) to the host ...
0
votes
2answers
73 views

How can I see the rate at which data is sent?

I have an app that sends messages over UDP in some known format. I'd like to know the rate at which these messages are sent. To be clear, I could care less about the datarate - it's a loopback, so ...
5
votes
1answer
472 views

Does TCP/UDP send file sequentially or randomnly?

Does TCP/UDP protocol always send or receive file packets sequentially? Would it possible to make a choice which data packets will be sent first using sockets API?
0
votes
1answer
706 views

VPN for specific UDP ports?

My ping to DotA 2 servers (online video game) is very poor in afternoon hours. My ping usually go as high as 300ms or even more. I tried to use OpenVPN with my dedicated server my ping decreased to ...
0
votes
1answer
207 views

What is fjappmgrbulk?

I captured a udp packet from wireshark which ones port is 2510 and destination ip is 81.64.155.202. What is that port for? I found this post) mentioning: "it's for fjappmgrbulk, fjappmgrbulk ...
1
vote
1answer
363 views

Sending a file via TCP/UDP socket

I'm reading about TCP and UDP from a article. In the end what I understood is that UDP is faster than TCP but it is unreliable. So if I'm going to a send a file, If use UDP, would it be faster than ...
1
vote
1answer
821 views

How to listen to all ports (udp and tcp) or make them all appear open in Debian

I got an external Debian server. The problem is that my university campus doesn't allow connections to go outside when the port is different than TCP port 22, 80, 443, or UDP port 123. I tested them ...
1
vote
1answer
1k views

Can I browse the web using the UDP protocol?

Is it possible to browse the web if a firewall is blocking the HTTP protocol? I've read about OpenVPN UDP tunnelling, but is it possible to use the web via the UDP protocol?
0
votes
0answers
111 views

windows xp irregularly refuses to connect to one specific webserver

I think of myself as an advanced user but this problem is driving me batty. Windows XP (32bit Home) going through a WRT54G router, once or twice a day at completely different random times, refuses to ...
2
votes
2answers
8k views

Netcat/socat behavior with piping and UDP?

I guess this is close to linux - Netcat stops listening for UDP traffic - Super User, but I thought I'd better ask anyways As far as versions of netcat I'm using Ubuntu 11.04 and the default netcat ...
2
votes
2answers
1k views

Live video streaming over UDP?

What options are currently available for live streaming of video over UDP? Current solution uses libx264 and wowza media server, to serve up an rtmp stream. Unfortunately it's communicating over ...
3
votes
1answer
8k views

Linux built-in or open source program to join multicast group?

I'm using tcpdump to capture multicast packets and had to code up a custom program to join multicast feeds so tcpdump will "see" the packets. Just wondering if netcat or any other applications can ...
3
votes
2answers
2k views

How do I control the streaming frame rate of ffmpeg?

I am using ffmpeg to stream video: ffmpeg -i $file -f mpegts udp://hostname:port On another machine, I am using VLC to play the output stream. The problem I have is that VLC is playing the stream ...
3
votes
3answers
414 views

How can I open a TCP/UDP connection on Linux?

I am looking for a simple command line tool to open TCP/UDP server/client on a desired port on a Linux machine. Are there any applications or commands that I can use to achieve this?
2
votes
1answer
643 views

Is there a userspace bandwith limit tool for Linux?

I want to limit the upload bandwidth of a P2P live video program, which is closed source, in Linux. I don't want to use tc because I don't have root access. There is a tool called trickle, but ...
4
votes
2answers
7k views

Does it matter what UDP port a WOL signal is sent to?

i have seen many WOL instances use port 7 and many use port 9, does it matter? Isn't it just looking for a WOL packet at layer 2 or ethernet?
4
votes
3answers
4k views

How to use DNS over TCP?

Google DNS (8.8.8.8 and 8.8.4.4) are blocked (or polluted) by all ISPs available to me (and DNS by ISPs just return wrong answers for some sensitive sites!!), and it is said that if we change DNS from ...
2
votes
3answers
5k views

Proxifier that supports UDP?

Im looking for a proxifier that forces all Windows traffic through a specific proxy. I have my own server so I can ultimately configure any type of proxy (Socks, HTTPS, etc) so thats not a problem, ...
1
vote
1answer
1k views

Comparison: UDP vs TCP [closed]

UDP vs TCP. What are these ? What are their Differences, pros and cons ?
0
votes
1answer
50 views

Which element of network refused connection

How could I determine, which element of the network actually refused/closed the connection?
1
vote
2answers
12k views

How to stream my media via vlc using udp streaming method?

I would like to know how to stream my media via vlc using udp streaming method?
2
votes
2answers
241 views

Detect all computers running a service on a network

I'm trying to write a file synchronization protocol presently (consider it a hobby, I know there are plenty of file synchronizers out there) and I wanted to create a way to automatically sync things ...
2
votes
2answers
5k views

Mcafee Host Intrusion Protection blocks all-in-one network printer

I just bought a new HP Officejet 6500 printer. It has a built-in ethernet port, so I happily connected it to my network. While I was playing around with it, I saw that it stopped responding ...
1
vote
3answers
1k views

Force OS X to use SOCKS5

Currently I am using an OpenSSH session (with the -D flag to enable dynamic application level port forwarding) as a SOCKS proxy while I'm accessing the internet through an unencrypted wireless access ...
1
vote
1answer
696 views

Windows 7: how to redirect dhcp traffic to alternative port

I was hoping someone could help me find a way to force DHCP traffic to use an alternative port on Win7. I need windows to send and listen for dhcp traffic on a port other than 67/68. I have tried to ...
6
votes
1answer
4k views

How to deliberately introduce a delay for incoming UDP packets

I want each packet (that match iptables rule) to be delayed by some fixed time interval. How to to this? Preudocode: iptables -A INPUT -p udp <more conditions> -j DELAY --delay 50000 # delay ...
1
vote
1answer
3k views

UDP blocked by Windows XP Firewall when sending to local machine

I work for a software development company but the issue doesn't seem to be programming-related. Here is my setup: Windows XP Professional with Service Pack 3, all updated Program that sends UDP ...
3
votes
1answer
913 views

Can I use TCP as DNS query protocol on Mac OS?

I'm using Mac OS, Snow Leopard 10.6.2, and I'm suffering from UDP packet loss during DNS query. So my web browser is too slow to surf internet nicely. But it worked very well when I tried a DNS query ...
3
votes
2answers
6k views

What does this UDP Packet mean?

I'm total newbie at tcp/ip and I was experimenting with Wireshark. What this mean: 1824 578.194204 xxx.xxx.xxx.xxx yyy.yyy.yyy.yyy UDP Source port: 17500 Destination port: 17500 In data I ...
6
votes
2answers
13k views

How to generate UDP packet

I want to generate UDP packet to test a program, something equivalent to using telnet to test TCP port (Can telnet generate UDP packet?) How can I do this?