Dec 21, 2013 The issue started on, somewhere about 19:35 with an initial burst of bandwidth of 35Mbits/s and lasted until about 20:40 (my bandwidth chart is accurate to 5mins). The total transfer was 14GB. After this time, while Outlook was running, the bandwidth from my workstation to the email server was 4-6Mbits/s for 5 mins, every 15 mins.
Throttling is a process that is used to control the usage of APIs by consumers during a given period. You can define throttling at the application level and API level. Throttling limit is considered as cumulative at API level.
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Administrators and publishers of API manager can use throttling to limit the number of API requests per day/week/month. For example, you can limit the number of total API requests as 10000/day.
When a throttle limit is crossed, the server sends 429 message as HTTP status to the user with message content as 'too many requests'.
Throttling in API manager can be of two types: Hard and soft.
Hard: The number of API requests cannot exceed the throttle limit.
Soft: In this type, you can set the API request limit to exceed a certain percentage. For example, if you set the exceed limit to 90%, user gets a notification when the exceed limit is crossed.
Rate-limiting is a process that is used to define the rate at which consumers can access APIs. Also, it determines the speed at which a consumer can access APIs. Rate limit is calculated in real time.
Rate-limiting is applicable to resources. For example, in the following endpoint URL, 'http://endpointurl/products', '/products' is a resource. It can be configured or over-ridden resource level.
You can add rate limits to API resources for the SLA plans to which the APIs are subscribed. Once the API exceeds the rate limit, the subscriber gets Status 429 message in the response header. Status 429 message indicates that the rate-limit has crossed.
For more information on adding rate limits to API resources, refer Adding rate limits to API resources section in Publisher document. Publisher assigns multiple plans for APIs while publishing them. Subscriber can select one of the plans while consuming APIs.
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Administrators and publishers of API manager can use rate limiting to define the number of API requests per second/minute/hour. For example, if you set the rate as 5 req/sec, the speed at which a consumer can access each API can be high.
If API Manager is deployed in a cluster, the rate-limit is considered across the nodes. The consumer gets an error message whenever the defined limit is crossed within a single node or across a combination of nodes.
In API manager, two types of algorithms can be used to limit the rate: Rolling and Fixed.
In fixed window algorithm, the period is considered from the starting of the time unit to the end of the time unit. For example, a period is considered as 0-60 seconds for a minute irrespective of the time frame at which the API request has been made.
In rolling window algorithm, the period is considered from the fraction of the time at which the request has been made to the end of the time unit. For example, if two requests for API calls are made at 30th second and 40th second of a minute it is considered as two requests from 30th second of that minute up to the 30th second of next minute.
Consider an illustration as follows:
Let us assume there is a rate limit as 2 req/sec. In the above snapshot, you can notice two requests/occurrences before 1.0 second and two more occurrences after 1.0 second.
If you apply fixed window algorithm to this illustration, then two requests/occurrences are considered within 1 second. If you apply rolling window algorithm, then four occurrences are considered within 1 second.
SLA configuration in API manager enforces access control to the users through rate-limiting and throttling. For instructions to configure SLA as an Administrator, refer to the Administrator document.
As a publisher, you can create a subscription plan and assign throttling limits to an API. For more information on specific instructions, refer to Add tiers to an API section of Publisher document.
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(Be nice to my poor Mini, and note that it's under the same bandwidth throttling that's described here!)
Is this because the rules clear every time the computer reboots? Just curious. I'm looking to use this in an office environment to single out some people who download stuff and hog my bandwidth :)
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When you do things right, people won't be sure you've done anything at all.
One awesome thing about this is that the changes are made in real-time, so if somebody is hogging your bandwidth you can do this trick without having to restart your network or even lose connection of open sockets. This is great for when torrents are killing your surfing speeds, when somebody begins leeching your web-share, etc., because you don't have to kill those active connections to gain the benefit of throttling. This also allows you to use a real-time graph to view the difference your rule is making so you can tweak if necessary.
That's awesome! I've always wanted to know how to limit my bandwidth so I can test how my websites are loading at dial-up speeds.
Great tip!
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.:: Zeb ::.
zebellis.com
This is a great tip, but does anyone know of a way to limit individual users' TOTAL bandwidth over time? For instance, limit Joe User to download 100MB over 24 hours?
For those of you wanting more..
We've got a pretty detailed article about dummynet on AFP548.com. I think that MacGeekery.com does as well.
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http://www.afp548.com
Breaking my server to save yours.
Well, this is cool. I've been using 'throttled', but I think I may like this technique better because when I watch the network activity, I'm not sure throttled is working very well. The graph in the network monitor definitely goes above the limits I set occasionally. I thought I remembered it working really well when I first set it up, but now I tend to get page stalls when browsing during a period of a lot of network activity (up/downloads going on on my mini). I've been assuming that my issues may stem from wireless network interference, but running iStumbler shows the interference is low. Ah well. I'll try this out. How do I limit bandwidth on all outbound (and separately inbound) ports instead of just one port?
Thanks,
Rob
One can Waterroof, a very nice frontend that exposes a lot of these features .
http://www.hanynet.com/waterroof/
This is not working for me. I tried it out on a filesharing (AFP) connection between 2 computers on my home network. From one computer I mounted the hard drive of the second computer. I then transferred a 65 MB file and found that I was getting a transfer speed of over 20 MB/s on my gigabit ethernet network. Then I tried the commands to limit the transfer speed as follows..
sudo ipfw pipe 1 config bw 1MByte/s
sudo ipfw add 1 pipe 1 src-port 548
I then transferred the file again and my transfer speed dropped dramatically, but it dropped to 5 MB/s instead of 1 MB/s. I played around with the commands but no matter what speed I set it always transfers at 5 MB/s. When I delete the rule and the pipe my transfer speed again shoots to over 20 MB/s, so it is doing something but it does not limit the transfer speed as set.
Any thoughts or suggestions?
Are you measuring the speed in megaBytes, or megabits? 1MByte/s is about 8Mbits/s.. That could be one explanation.
I've tried ALL of the ones listed here, AFP simply seems to NOT listen to the ipfw..
All i want to do is regulate AFP bandwidth on my network, anybody have a way to do that?
Thanks for the suggestion, but that's not it. No matter what speed I set in the shell command (i.e. 1 MB/s or 10 MB/s) it always throttles it to the same speed of 5MB/s. So even if I did confuse mb with MB I still would have seen a difference when changing speeds.. but I don't.
dst-port 548
as well, or to dst-ip ..
sudo sysctl -w net.inet.ip.fw.one_pass=1
I want to only throttle the iTunes application. The above tip works fine with iTunes with port 80 but what if I want my other applications to have full access to my bandwidth?
Is there a way from the command line to just limit specific applications?
Thanks, Joe
Lighthouse will let you select an app, forward info from the normal port to another internal port, and when used with the script described before, and the internal port number, you can slow a specific app down, while leaving the others to use as much bandwidth as there is left over. This type of solution would work even better if you could define similar behavior by ip adress from inside an airport router, but apple hasn't seen fit to make that part of their software. Still, lighthouse is a great app for this type of control. You can redirect traffic from any number of ports to a single port, and set how much bandwidth the internal port has using these scripts. You can even schedule it using the latest iCal in Leopard if you save these as terminal scripts. If you can find freeware for redirecting by application, please post. I'd love to be able to try it.
Hello everybody,
I've seen applications that forward ports based on the application you specify. You could forward information for any app through these, set one specific port, then use the commands at the top of this thread to limit bandwidth to that port. Remember, when you use these commands you are specifying the internal destination; and if you've routed one port to another for a specific application, the only port you need to worry about is which one the application will 'see' or use. This will allow you to limit bandwidth to that internal port, and it will 'pull' information through the outer one at the limit you've defined. I've tried lighthouse, great for this, but I believe there are others that are freeware. I hope this helps somebody.
I've tried ALL of the ones listed here, AFP simply seems to NOT listen to the ipfw..
All i want to do is regulate AFP bandwidth on my network, anybody have a way to do that?