Questions tagged [udp]
For questions about User Datagram Protocol, a Transport Layer protocol.
16
questions
8
votes
1answer
2k views
UDP hole punching NAT port
I just read an article about the process of "punching holes" with the UDP protocol. I understand how it's done, but I have one last question to clear up things. We have the rendezvous server and ...
6
votes
2answers
2k views
What is the reason for the different order of the Source and Destination in a L2 header?
A TCP/UDP header (Layer 4) lists the Source Port, then the Destination Port:
An IP header (Layer 3) lists the Source IP, then the Destination IP:
An Ethernet header (L2) and a WiFi Header (L2) lists ...
3
votes
1answer
4k views
Traceroute UDP port question
I know, that traceroute uses UDP, and for destination port it starts with 33434. Then, with each next hop it increments the destination port number by 1. The questions is: why does traceroute need to ...
5
votes
2answers
5k views
How does a layer-2 switch work with UDP?
If UDP and/or TCP send packets via IP to an Internet Protocol Address, how can a layer-2 switch forward these?
Is this possible or do you need a layer-3 switch?
1
vote
2answers
156 views
Which port determines the protocol?
If we have a common protocol port on both ends.. say source point is 443 and destination port is 80 (hypothetical situation, I know this combination of ports probably makes no sense).. how do we ...
3
votes
2answers
5k views
Should I increase the timeout value for UDP on our VPN router-device?
We have a SonicWALL NSA 2400. We have numerous (100+) personnel in different offices in different physical locations that establish VPN sessions successfully every day. Some of these client computers ...
18
votes
3answers
8k views
What do TCP/UDP add to “raw ip”?
I know that both TCP and UDP are built on top of IP, and I know the differences between TCP & UDP, but I'm confused about what exactly "raw ip" is. Would it be fair to say that TCP & UDP both ...
27
votes
8answers
18k views
Why does DHCP use UDP and not TCP?
DHCP uses UDP as its transport protocol. DHCP messages that a client sends to a server are sent to well-known port 67 (UDP—Bootstrap Protocol and DHCP). DHCP Messages that a server sends to a client ...
8
votes
4answers
9k views
Why is a TCP Socket identified by a 4 tuple?
Newbie to networking here. I'm reading the Computer Networking (3rd edition) book, and in section 3.2 they are discussing multiplexing / demultiplexing for both UDP and TCP.
In the UDP protocol, a ...
9
votes
4answers
31k views
How to know whether a protocol uses TCP or UDP
Well I know that might sound a stupid question and I believe that the most proper answer will be like I will be able to tell as my experience builds up and I learn more and more about the protocols.
...
9
votes
3answers
18k views
Traceroute Over TCP vs UDP
For what purpose would one wish to send traceroute over TCP rather than UDP? What advantages/disadvantages are there in doing so? I know that traceroute normally uses UDP ICMP "echo" packets while ...
4
votes
3answers
8k views
Why do i only see QUIC and not UDP during capture in wireshark?
I've been using wireshark and noticed that I no longer see UDP but QUIC, why is this the case?
0
votes
2answers
116 views
If you're behind a firewall and all the ports are blocked, how is your browser able to access the internet? [closed]
I'm behind a router and I'm able to run game servers on my home computer after forwarding ports or using the DMZ feature on the router. However, I still don't understand the underlying technology as ...
3
votes
2answers
3k views
When is TFTP used? [closed]
It seems like a strange idea to transfer files using a connectionless protocol - so in what situation would you not care about if the entire file is delivered or not? I read somewhere that TFTP is ...
2
votes
1answer
6k views
Iperf results on UDP Bandwidth
I am currently testing iperf with a view to automating some testing servers for our company.
To do this I am using an iperf server in the cloud which is well connected and is only 5 hops away from ...
2
votes
2answers
501 views
single connection over multiple internet connections
Hi not sure where to ask this thought this would be the best place, i was just wondering if it was at all possible to have a single connection get the benefit of multiple internet connections.
For ...
