Greetings all, I've got an issue I was hoping to put a few more eyes on. Here's the scenario. Downloading a file at our Border is multiple orders of magnitude faster then a few hops out. Using the same 128MB test file, I tested at two different locations. As well as between them. Using multiple connections improves throughput, However it's the single stream issue we're looking at right now. All testing servers in question are Centos Linux. Orlando Datapath: Cogent>Orlando Border Router (Mikrotik)>HP Procurve Switch> Server Results: 2013-08-29 05:04:09 (52.6 MB/s) - `128mbfile.tgz' saved [127926272/127926272] Cocoa NOC Datapath: Cogent>Orlando Border Router (Mikrotik)>Licensed Microwave Link (300+Mb/s Capacity)>East Orange Router (Mikrotik)> Licensed Microwave Link (300+Mb/s Capacity)>Cocoa Router (Mikrotik)>Licensed Microwave Link (300+Mb/s Capacity)>Colo Router (Mikrotik)>NOC Router (Mikrotik)>HP Procurve Switch>Server Results: 2013-08-26 13:42:25 (398 KB/s) - `128mbfile.tgz' saved [127926272/127926272] Orlando-Cocoa NOC Datapath: Orlando Server>HP Procurve Switch>Orlando Border Router (Mikrotik)>Licensed Microwave Link (300+Mb/s Capacity)>East Orange Router (Mikrotik)> Licensed Microwave Link (300+Mb/s Capacity)>Cocoa Router (Mikrotik)>Licensed Microwave Link (300+Mb/s Capacity)>Colo Router (Mikrotik)>NOC Router(Mikrotik)>HP Procurve Switch>ServerResults: 2013-08-26 13:56:25 (3.31 MB/s) - `128mbfile.tgz' saved [134217728/134217728] Now, For the fun of it. I ran Iperf single TCP between our Cocoa and Orlando POP's. Just like the HTTP test above. (Server has a 100Mb/s port). It maxes out the port, Unlike the HTTP test. [root@ded01 ~]# iperf -c 208.90.219.18------------------------------------------------------------Cli ent connecting to 208.90.219.18, TCP port 5001TCP window size: 16.0 KByte (default)------------------------------------------------------------[ 3] local 206.208.56.130 port 47281 connected with 208.90.219.18 port 5001[ ID] Interval Transfer Bandwidth[ 3] 0.0-10.0 sec 114 MBytes 95.7 Mbits/sec Here's associated packet captures for each transfer. As well as full wget output and traceroutes for each test. As you can see, The tests crossing the wireless links show about 3x more TCP re-transmits/dup ACK's. But I'm not sure I'm sold this could show such a huge drop in throughput. Other then that, nothing really stands out to me as to why these transfers are so much slower. Intra-network iperf testing shows full throughput the whole way with single connection. As well as UDP testing. One thing to note is the Iperf testing has far less TCP re-transmit/dup acks then any of the HTTP testing, Crossing the same Microwave Links and routers. http://cdn.141networks.com/files/captures.zip I appreciate any insight anyone might have. Thanks! Nick Olsen Network Operations (855) FLSPEED x106