North American Network Operators Group

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Re: Cogent and Level3 Peering Issues

  • From: Petri Helenius
  • Date: Wed Dec 18 16:41:04 2002

[email protected] 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


On Wed, 18 Dec 2002 [email protected] wrote:

Me thinks Cogent doesn't have a problem with congestion on the inbound direction. Fix your reverse path.

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.