Hello folks,
This is not necessarily an Extreme Networks specific question, but I am hoping the community here can give me a clue about a problem that I have exhausted myself on.
I have a remote site which is connected to my home office using a Spectrum MPLS circuit (20Mbps). When *downloading* a file to a client PC from the home office, the speed is around 512KBps. At times, it will leap to 700KBps and then immediately drop. There are also long pauses before the transfer starts. And there are several pauses during the transfer. If I upload that same file to that same server, the speed is 2MBps (what is expected).
Some facts about the issue:
- A simple speed test indicates I am getting a full 20Mbps in both directions.
- Downloading a file using FTP, I achieve full speed.
- Downloading anything from the Internet - I achieve full speed.
- I have verified speed and duplex settings on the interfaces which connect the two sites, and they are fine.
- I have uninstalled the Antivirus software on the client, with no change.
- Downloading while connected to my Extreme Networks wireless access point at this site - I achieve full speed!?!?
- Lowering the MTU of the client had no effect (I played the game of ping -f to find the 'perfect MTU value'). Although I found that the native MTU it was choosing for the file transfer was 1514 (while the MPLS circuit is 1500).
- The switch at the site is an old Cisco Catalyst. I have exchanged that switch with a known good spare which had no effect.
- I have replaced all the cables with brand new Cat6e cables, which had no effect.
I am going to try and attach some Wireshark captures demonstrating a "fast" and then a "slow" transfer. The difference is that the fast transfer was achieved on wireless, and the slow transfer was while connected via physical cable to the switch.
Here is a SLOW file transfer:
CLICK ME
Here is a FAST file transfer:
CLICK ME
