Personally, I would look for out of order packet receipt. We've seen this increase steadily over the past two years with Internet traffic, in particular with international links.
The issue is that packets are being delivered with the order mixed up. Packets 1 through 10 are being received 2 6 4 1 5 7 8 3 10 9 (example). This causes a problem with TCP flows, and will normally choke transfer speeds to practically nothing (similar to what you are seeing). If you run a sniffer on the traffic to and from your servers, you should see the packets being received out of order, and large numbers of TCP Fast Retransmits being issued from the the receiving system.
I don't know if the carriers are doing this deliberately, or there is some other explanation, but it's a difficult situation to correct for, and Cisco doesn't have a product that will do it. Other companies do have products which will reorder packets on the receiver end.
One benefit of this is that it chokes Bittorrent down to nothing.
You -will- need a sniffer to properly diagnose this issue. If you don't have a professional network sniffer, Ethereal does the job in a pinch.
there are two things I would look for first. One could be MTU related issues, which would result in retransmissions. on a Cisco router those can be sorted out with the command "ip tcp adjust-mss 1300".
The second thing I would look for are TCP related problems, besides reordering mentioned above, also window size.
TCP throughput is approx. (TCP window size)/(round trip time). Given the numbers from your post RTT=0.11 sec and throughput 800000 bps one would get a window size of about close to 16 kByte, which is default on some Microsoft operating systems. Make sure you get at least 64 kByte or more to allow for higher throughput. The calculation only holds, when there are no dropped packets. Retransmissions lead to a reduced window size (half of previous value) and therefore reduced throughput.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...