Cogent and Level3 Peering Issues

Wed Dec 18 21:38:02 UTC 2002

william at elan.net wrote:

>Thing is if your connection is completely full one way, it'll effect 
>traffic the other way too. It should not be happening with syncronyous 
>connections, but practical observation is that it does! I suspect router 
>hardware is to blame (possibly packet cache is way full) and I'v seen 
>it happen only if you try to send 100% more traffic then link can handle 
>(just 100% traffic does not efect it - have to really push it), this 
>happened on 100Mb and even on Gb interface.
>  
>
Or could it be that your ACK packets just simply get  delayed enough for 
the traffic
to the other direction to suffer somewhat?

This is quite common phenomenan in asymmetric links but also exists for 
symmetric
ones.

Pete

>On Wed, 18 Dec 2002 alex at yuriev.com wrote:
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>>>>Me thinks Cogent doesn't have a problem with congestion on the inbound 
>>>>direction. Fix your reverse path.
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>>>>
>>>Customers of Cogent should be/are more concerned about congestion on the
>>>inbounds at Level3 <-> Cogent; outbound is way too easy to control.
>>>      
>>>
>>Cogent has a pile of available inbound - websites tend to send traffic out,
>>not take traffic in.
>>
>>Alex
>>
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