Send Udp Packet Online
Packet Sender – Free utility to for sending / receiving of …
Packet Sender – Free utility to for sending / receiving of network packets. TCP, UDP, SSL.
Features
Packet Sender can send and receive UDP, TCP, and SSL on the ports of your choosing. All servers and clients may run simultaneously.
Client/Server
Send & Receive. UDP, TCP, or SSL.
ASCII or HEX
Any data can be defined.
Cross-platform
Windows, Mac, Linux.
Command Line
For automation / scripting
Packet Sender Cloud
Save. Share. Collaborate.
Common Uses
Packet Sender was designed to be very easy to use
while still providing enough features for power users.
• Test automation
Using its command line tool or hotkeys
• Testing network APIs
Using the built-in UDP / TCP / SSL clients
• Malware analysis
using the built-in UDP / TCP / SSL servers
• Testing network connectivity/firewalls
by having 2 Packet Senders talk to each other
• Tech support
by sending customers a portable Packet Sender with pre-defined settings and packets
• Security research
Send SSL and then analyze the traffic log.
UDP Packet Generator – NetScanTools
Purpose of UDP mode in the Packet Generator Tool
The purpose of this tool is togive you a way to craft a
UDP packet or set of UDP packets to send to a target, then
observe the target’s response with a packet capturing tool
like Packet Capture
or view the results of those packets attacks in
the log files on the target. For example, you might alter a
UDP packet with information that is not usually found in the
packet in order to see the response of a program or firewall
to the malformed packet.
Overview
Capabilities
Screenshots
Video
Try the DEMO
About crafting and sending UDP packets
using the Packet Generator
The Packet Generator tool has a UDP mode
that allows you to create and send one or
more UDP packets to a target. You have full
control over the header flags and the other
fields within the UDP header. You can add a
payload either in the form of text or of a
file to the packet. This tool currently
sends packets with IPv4 headers. IPv6 will
be coming soon.
Scripted packet transmission can be used
to send multiple different UDP packets.
Related Tool Links
Packet
Flooder
Sending a TCP Packet
Sending a UDP Packet
Sending an ICMP Packet
Sending a CDP Packet
Sending an ARP Packet
Packet Generator
Important Notes about the Packet Generator
This tool uses WinPcap to send packets. The network interface
you use to send packets must be compatible with
WinPcap. Best results are usually obtained from a wired
ethernet interface or a 802. 11 wireless interface.
This tool does not send packets
at a rate necessary to stress or otherwise saturate
an interface. It is not a high speed Traffic Generator and
it does not respond to packets coming back.
Please consider the
Packet Flooder Tool.
Packet Generator Tool Capabilities – UDP Mode
Sends UDP Packets to the IPv4 address specified.
Full header control for the UDP
packet. You can specify most parameters in
the header such as source and destination IPv4 address,
packet length, packet types and checksums. The
ethernet source and destination address can also be
defined.
Data Payloads can be added. The payload can be simple
text or a file of your choosing. The length of the data
payload is limited by the interface MTU and the packet
type. We provide a Hex Editor to assist in creating
or editing binary packet payloads.
The packet size is limited
to the MTU of your network, typically 1460 bytes for ethernet.
Scripting. Simple scripting
is provided so that you can send different types packets.
Scripted packet transmission can be used to send packets
with parameters changing according to your script.
UDP Send Mode
Capture of what was sent
A video of the Packet Generator tool sending UDP Packets
Notes about this tool
This tool uses WinPcap to send specialized packets.
How do online games send UDP packets across the internet?
How do online multiplayer games which use UDP get the packets delivered between networks over the internet? From what I understand, clients would have to enable port forwarding on their routers in order for the packets to arrive at their computer. Is this what big online games (WoW, Diablo, etc) require players to do?
For example, I recently created a server that handles udp traffic. It just echos back whatever a sender has sent. I deployed this to a server on the internet. I can only get the echos back to the sender after enabling port forwarding, but this will not work if there are two senders on the same local network.
asked Aug 8 at 1:50
0
Short answer: NAT Connection tracking
One thing to remember is that the vast majority of Routers on the IPv4 internet is NAT Routers.
Most NAT implementations does smart tracking, When you send UDP from a internal client to somewhere you will have a Destination Port and a Source Port.
If traffic comes in with the ports reversed, then that traffic will be routed back to your client, and allowed in most firewalls.
NAT/Firewalls with tracking detects these packets as related and forwards them back.
Example based on comments with server on port 5000 UDP
Client sends a packet for server:5000, source client:5001
First NAT router will see a packet with source ip and port of client:5001, and destination server:5000.
Router sends this on it’s way, and will have NATip:NATport
Server receives this and creates a response to NATip:NATport that has the source of server:5000
NAT receives this and has source server:5000 destination NATip:NATport, which matches the packet that was sent out (but has source and destination reversed)
NAT sends this to client:5001 still with source server:5000
The source ip+port and destination ip+port creates a combination that can be tracked. (there is more details, but this is the basics)
Some more reading But I should dig up better documentation on this and not just refer to anecdotal evidence from what I have seen experienced.
answered Aug 8 at 5:10
NiKiZeNiKiZe8725 silver badges17 bronze badges
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