14
votes
Accepted
Can throughput exceed the bandwidth of a network
The bandwidth is the number of bits that can be sent on a link in one second. The throughput is the amount of data that is sent, and that will need to subtract the protocol overhead from the bandwidth,...
- 98.7k
11
votes
Bandwidth vs Throughput vs Data(bit) rate
Daily I see peoples even specialists in communication do mistakes about the three mentioned terms:
Bandwidth: The unit of it is Hz, so it is mathematically is: High_Used_Frequency - Low_Used_Frequency....
- 111
11
votes
Accepted
Bandwidth vs Throughput vs Data(bit) rate
Some of these terms are used differently by different people, but below is what is generally accepted.
Bandwidth is the number of bits per second that a link can send or receive, including all flows. ...
- 98.7k
8
votes
Accepted
Cisco Router (ISR4221) Throughput - Why so slow?
That's by product design. ISR 4k come with a platform shaper (upgradeable to ~2x the value by license upgrade with the "PERF" license).
Cisco say that the limits of the platform shapers can be fully ...
- 8,801
7
votes
Accepted
Does distance of one user from WiFi AP have negative impact on other connected users?
Does distance of one user from WiFi AP have negative impact on other connected users?
Yes, this is true at least in the traditional 802.11 network.
Why? By the nature of 802.11 wireless, a channel (...
- 27.2k
5
votes
Do packets take the same amount of time when they are within the MTU?
I'm not completely sure what you mean.
A link will have a bandwidth. Let's assume 10 Mbps ethernet. Ethernet has some overhead: a seven octet synchronization, a one octet start-of-frame delimiter, a ...
- 98.7k
5
votes
Accepted
How can I calculate the network throughput using ping responses?
ICMP has got an overhead of 8 bytes, IPv6 of 40 bytes, (assumed, untagged) Ethernet of 38 bytes. With a payload length of 1388 bytes, the total per packet is 11,792 bits on the wire.
Ping doesn't ...
- 82.6k
5
votes
Accepted
What's the term for throughput including all Ethernet overhead?
I simply call this link speed or L1 throughput; with Ethernet, this is the nominal speed.
You can directly calculate the maximum, effective L4 throughput for TCP over IPv4 over standard Ethernet (...
- 82.6k
4
votes
Accepted
Bandwidth is mimimum of the path?
The slowest link in a path will dictate the transfer speed, but a raw bitrate is only one part of it. You also need to consider the packet size and protocol overhead. The smaller the packets, the more ...
- 98.7k
4
votes
Accepted
Cisco throughput testing with null:
This is not a valid test, because you are using the router process to handle all the overhead of copying, decrypting, etc using scp. Normally, the router can forward packets without involving the ...
- 67.1k
4
votes
Accepted
Does the direction of a throughput bottleneck matter?
If a network has a throughput bottleneck, does it matter whether the slow link comes before or after?
No it doesn't, Only matters when destination is before or after that bottleneck link.
What ...
- 343
4
votes
How to calculate throughput in Kpps?
The bandwidth test will not help you properly determine your firewall needs, as it is only testing how much available bandwidth you have.
Graphing either through RouterOS or through a third party ...
4
votes
Accepted
Why does throughput (consumed BW) increase when the packet error rate is increased in the TCP?
Errors in transmission are detected in TCP layer.
The receiving TCP layer discards the damaged segment, forcing the sender to sent the segment again.
- 4,487
4
votes
Accepted
Throughput up to 1.2Gbps?
As you can see on the image the device has multiple interfaces. The 1.2Gbps throughput is the total traffic it can process on all ports, not per port.
- 17k
4
votes
Can I increase throughput and decrease network latency by installing multiple NICs?
This is an interesting but complicated topic and like most things engineering the answer is: It depends! In this case the lack of detail adds ambiguity (I'm not allowed to comment asking for ...
- 181
4
votes
Accepted
Cisco routers THROUGHPUT - MTU and packet size
When calculating the possible throughput, which pacet size should I
take?
Short answer: search the internet for "IMIX" or "Internet Mix"
The basic issue is this: network devices process and ...
- 2,416
4
votes
Accepted
What is the relationship between throughput and latency
i.e. 1000 packets * 400ms latency (i.e. 400ms RTT - I understand
latency to usually refer to RTT) = at least 400 seconds to deliver the
HTTP payload.
Well that would only be true if every single ...
- 8,801
3
votes
Accepted
Throughput in a 2 link network
I think the reason is :
Having determined the throughput, we can now approximate the time
it takes...
The last packet is received in about a ms, and this doesn't change much the calculated ...
- 19.5k
3
votes
Accepted
Where are UDP packets lost during iPerf test?
When more traffic than a link can handle is sent to a link, the interface to that link will end up dropping the packets destined for that link. This is congestion, and there are some small mitigations ...
- 98.7k
3
votes
Accepted
How troubleshoot poor ipsec connection?
Normally you would first check whether all packets are being encapsulated and decapsulated OK by viewing ipsec counters on the tunnel endpoints.
However if you want to look at packets, first you need ...
- 1,181
3
votes
Lower throughput with fixed TCP window size?
That's not a shock. These day we automatically tune the amount of RAM assigned to TCP buffers (aka the maximum TCP window size), and by specifying the window size you are turning off the automated ...
- 1,171
3
votes
Lower throughput with fixed TCP window size?
As Marco mentioned,
Receive window sizes (rwin) will increase and decrease automatically during a TCP session depending on how lossy the connection ends up being. It is therefore possible that ...
- 2,337
3
votes
Lower throughput with fixed TCP window size?
Receive window sizes (rwin) will increase and decrease automatically during a TCP session depending on how lossy the connection ends up being. It is therefore possible that when you omit the -w flag ...
- 186
3
votes
Accepted
Cisco ASR1001 licence throughput measurement
Yes those dropped packets would factor into available throughput, and this is because ACLs are processed by the ESP [Embedded Services Processor] which measures bandwidth. All those packets are being ...
3
votes
Delays and throughput
Is transmission rate same as Bandwidth?
In essence yes, with some small adjustments for the difference between the clocking of the media ("bandwidth") and the actual rate at which packets are ...
- 1,171
3
votes
How to determine the throughput of the TCP connection?
Yes, this is completely normal. And you use the minimum value of the calculations that you have done above. Think about how long it would take to move a box of paper down the hall - now imagine that ...
- 186
3
votes
Cisco routers THROUGHPUT - MTU and packet size
The MTU is dictated by the link. For example, ethernet has an MTU of 1500, while frame relay on a serial interface has a much larger MTU.
Other factors can reduce the MTU. For example, a tunnel will ...
- 98.7k
3
votes
Theoretical: Bottleneck in a switch stacking environment
With a 10 Gbit/s uplink, 10 Gbit/s stack interlinks and only 100 Mbit/s edge ports the uplink bottleneck is rather theoretical.
48 FE ports on each switch can transport an aggregate, peak edge-to-...
- 82.6k
3
votes
Accepted
IPoIB with Netem (Latency emulation) Poor performance
The most common mistake made when using netem to emulate network delay is to not increase the packet limit. You didn't. Therefore you tail drop a lot of packets and tcp cannot build a queue long ...
- 96
3
votes
Does distance of one user from WiFi AP have negative impact on other connected users?
An individual station will receive traffic at whatever speed it can, independent of any other stations. In infrastructure mode (with an AP), stations communicate with the AP, not each other, so the ...
- 31.7k
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