14 votes
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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,...
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11 votes
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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. ...
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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....
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8 votes
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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 ...
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7 votes
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Difference between good-put throughput and data rate

Wikipedia has a good explanation: http://en.wikipedia.org/wiki/Goodput ... In computer networks, goodput is the application level throughput, i.e. the number of useful information bits delivered ...
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7 votes
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Throttling among Data Centers

I am unable to throttle the network by submitting my UDP packets among such links because I worry about packet drops and message losses. At first blush, this sounds more like a design problem with ...
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7 votes
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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 (...
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5 votes
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can average througput be greater than bandwidth?

Is it possible for the throughput to be greater than the bandwidth of the cable ? Like many things, the devil is often in the details. Depending on how the measurement is taken, then yes it is ...
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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 ...
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5 votes
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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 ...
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5 votes
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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 (...
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4 votes
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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 ...
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4 votes
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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 ...
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4 votes
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Is an interface's limit independent of input/output?

It depends™. Normally for a 10GBit/s interface it means 10GBit/s full-duplex, meaning you can receive and send at 10GBit/s at the same time. Sometimes marketing gets in the way and you get stuff like "...
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4 votes
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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 ...
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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 ...
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4 votes
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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.
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4 votes
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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.
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4 votes
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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 ...
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  • 2,396
4 votes
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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 ...
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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 ...
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  • 1,161
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 ...
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  • 2,317
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 ...
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3 votes
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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 ...
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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 ...
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  • 1,161
3 votes
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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 ...
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3 votes
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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 ...
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  • 1,181
3 votes

How to show throughput on Allied Telesis switch/router?

Since you're not mentioning any model or software version, I'm just guessing it's AlliedWare Plus. A quick google search gives me http://alliedtelesis.com/manuals/9000V218CLIRevA/ak1027137.html#...
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  • 15.6k
3 votes

Is an interface's limit independent of input/output?

If we assume 10G Ethernet which is full duplex, then yes, 10G and 10G out.
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  • 62k
3 votes

How does signal return loss affect network performance

A failure in the return loss measurement means that you have excess reflection energy from the cable configuration due to impedance mismatch. This failure means that a standards compliant transceiver ...
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