No Congestion Control
What is UDP No Congestion Control?
UDP does not implement congestion control mechanisms, meaning it does not reduce or adjust its sending rate in response to network congestion.
Why is UDP No Congestion Control useful?
This feature allows continuous and rapid data transmission regardless of network conditions, which is ideal for real-time applications that prioritize speed over reliability.
How does UDP handle No Congestion Control?
UDP sends packets as fast as the application allows, without checking for or reacting to congestion on the network, leaving traffic regulation to higher layers if needed.
Where is UDP No Congestion Control used?
It is commonly used in applications like VoIP, live streaming, online gaming, and DNS where low latency is more important than congestion handling.
Which OSI layer does UDP No Congestion Control belong to?
UDP operates at the Transport Layer (Layer 4) of the OSI model, but unlike TCP, it does not perform congestion control.
Is UDP No Congestion Control Windows specific?
No, UDP’s lack of congestion control is a protocol-level behavior and is consistent across all platforms, including Windows.
Is UDP No Congestion Control Linux specific?
No, Linux also implements UDP without congestion control, in line with the protocol specification.
Which Transport Protocol uses No Congestion Control?
UDP (User Datagram Protocol) does not implement congestion control, unlike TCP.
Is UDP No Congestion Control using client-server model?
Yes, UDP-based applications often follow a client-server model, but any congestion handling must be implemented by the application itself.
In this section, you are going to learn
Terminology
Version Info
setup
No Congestion Control - Testcases
S.No |
Test Case |
Description |
Expected Result |
|---|---|---|---|
1 |
High Bandwidth Usage |
Send large data continuously |
No throttling; bandwidth usage spikes |
2 |
Packet Drop Check |
Monitor packet loss under load |
Increased packet drops |
3 |
Latency Spike |
Measure latency during overload |
Latency increases significantly |
4 |
No ACK Handling |
Disable ACK-based flow control |
ACKs ignored; sender keeps sending |
5 |
Buffer Overflow |
Fill receiver buffer rapidly |
Receiver buffer overflows |
6 |
CPU Load Test |
Monitor CPU under high traffic |
CPU usage spikes |
7 |
Memory Leak Check |
Check memory usage over time |
Memory usage increases |
8 |
TCP Window Ignored |
Ignore TCP window size |
Sender sends beyond window size |
9 |
UDP Flood |
Send UDP packets at max rate |
No rate limiting; flood continues |
10 |
Network Saturation |
Saturate network link |
Link fully utilized |
11 |
Jitter Measurement |
Measure jitter under load |
High jitter observed |
12 |
No Retransmission Delay |
Disable retransmission delay |
Immediate retransmissions |
13 |
Queue Length Growth |
Monitor queue length |
Queue grows rapidly |
14 |
No Rate Adaptation |
Disable rate adaptation |
Constant send rate |
15 |
Packet Reordering |
Observe packet order |
Increased reordering |
16 |
No ECN Response |
Ignore ECN flags |
No congestion response |
17 |
Application Crash |
Stress test app |
App may crash under load |
18 |
No Flow Control |
Disable flow control |
Sender overwhelms receiver |
19 |
Bandwidth Starvation |
Compete with other flows |
Other flows starved |
20 |
No Backoff |
Disable exponential backoff |
Continuous retries |
21 |
Packet Duplication |
Check for duplicate packets |
Duplicates increase |
22 |
No RTT Adjustment |
Ignore RTT changes |
RTT not used for control |
23 |
Socket Buffer Overflow |
Fill socket buffer |
Buffer overflows |
24 |
No Congestion Window |
Disable congestion window |
Unlimited sending |
25 |
Network Device Overload |
Overload NIC |
NIC performance degrades |
26 |
No Slow Start |
Disable slow start |
Full rate from start |
27 |
No Fairness |
Compete with TCP flow |
TCP flow suffers |
28 |
No Throttling |
Disable app-level throttling |
App sends at max rate |
29 |
Packet Loss Pattern |
Analyze loss pattern |
Random or bursty losses |
30 |
No Bandwidth Estimation |
Disable bandwidth probing |
No adaptive behavior |
31 |
No Queue Management |
Disable AQM |
Queues fill up |
32 |
No Congestion Feedback |
Ignore feedback |
No rate adjustment |
33 |
No Pacing |
Disable packet pacing |
Bursty traffic |
34 |
No Timeout Handling |
Disable timeout logic |
No retransmission timeout |
35 |
No Flow Isolation |
Multiple flows interfere |
One flow dominates |
36 |
No Prioritization |
All packets equal |
No QoS enforcement |
37 |
No Load Balancing |
Single path used |
Path overloads |
38 |
No Packet Shaping |
Disable shaping |
Irregular traffic pattern |
39 |
No Logging |
Disable congestion logs |
No logs generated |
40 |
No Alerts |
Disable congestion alerts |
No alerts triggered |
41 |
No Retry Limit |
Infinite retries |
Retry storm |
42 |
No Drop Detection |
Ignore drops |
No recovery |
43 |
No Congestion Avoidance |
Disable avoidance logic |
Congestion worsens |
44 |
No Flow Termination |
Keep flow alive |
Flow never ends |
45 |
No Packet Prioritization |
All packets same priority |
Critical packets delayed |
46 |
No Adaptive Timeout |
Fixed timeout |
Inefficient retransmissions |
47 |
No Packet Inspection |
Disable DPI |
No traffic analysis |
48 |
No Rate Monitoring |
Disable rate checks |
Unmonitored traffic |
49 |
No Feedback Loop |
Disable feedback loop |
No control mechanism |
50 |
No Error Correction |
Disable FEC |
Errors not corrected |
Reference links