Unstable ping during downloading/uploading

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derekana

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Mar 20, 2012
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Hi everyone,

I am running a 34 computers cyber cafe business, I use 50mbps/5mbps COAX connection with a model (provided by TWC) -> router (TL-480t+) -> switcher (Netgear M4100-50g), I setup my bandwidth to 150 kbps down/25 kbps up on the TP-link router, every computer has exactly the bandwidth i setup with on speedtest.net or any other speed testing program. However, everytime 1-2 computer is going through uploading multiple pictures or updating on a game, the rest of computers are experiencing a 400-500 ping. How do i fix this issue so it doesn't matter what our customers do, it still won't effect other computers to have an unstable ping?

Thanks in advance !!
 
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Beachnative

Beachnative

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Jan 25, 2013
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Ping measures round trip latency. What are you pinging? Also pings are low on the priority list. Data first then ICMP responses.

At the WISP I worked I watched the company owner demonstrate this while updating the BGP routes in our edge router while at the same time pinging a given IP address.

Your solution should be not to throttle anyone. If two users are limited to a given speed and they download a huge file then a slice of bandwidth you allocated to them will always be carved out of your available bandwidth until they are done downloading it. Your "best effort" bandwidth will never be constant and/or reliably the same from day to day.

 
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derekana

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Mar 20, 2012
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Thanks for your quick response, so what should I do atm in order to stablize the ping for every computer even when someone is downloading or uploading pictures? You explained it, but what should i do to fix the problem?



 
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derekana

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Mar 20, 2012
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We setup Bandwidth control through router's admin, everything shows exactly the same as we setup on speedtest, however, if we use a P2P program or upload bunch of pictures at once, it will jack up our ping over 500+. We couldn't find a solution for it.
 
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Beachnative

Beachnative

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Jan 25, 2013
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You have a managed switch use that to rate limit everyone. I'm used to setting up the Cisco Catalyst series switches in a colo facility. It usually goes like this:
Make a VLAN for each user, apply it to the port and rate limit them there on the port. For you to avoid the the confusion make 3 VLANS, one named admin, one for sniffing and one for your clients. If you have a 48 port switch use ports 1-2 for VLAN1 3-4 for VLAN2 and the rest use for VLAN3.

All clients should plug into ports 5-48, use the port manager to ratelimit them by the port

Obviously the router is not doing it's job and you should not use it for it in the first place, a router is for routing. The switch is much more robust than that router and should easily accomplish it....BTW it has port mirroring to, you should be ready to packet sniff in a seconds notice if need to.
 
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