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On 05/25/2015 11:16 PM, Petter Adsen
wrote:
Well, I'm backOn Mon, 25 May 2015 18:53:42 -0700 Gary Roach <gary719_list1@verizon.net> wrote:On 05/24/2015 12:49 AM, Petter Adsen wrote:On Sun, 24 May 2015 00:27:02 -0700 Gary Roach <gary719_list1@verizon.net> wrote:On 05/22/2015 01:19 PM, Bob Proulx wrote:Darac Marjal wrote:Gary Roach wrote:When I start a download, it starts at 50M for the first few seconds and then drops to 500K to 100K range.Finally, don't rule out the possibility that your ISP is throttling you. While you may be synced at 50M and may be able to transfer at that for short periods (and thus, the ISP can rightly claim that you have a 50M connection), they could conceivably throttle your connection in the longer term.I think this is quite the most likely possibility. I have only anecdotal reports from friends but what I hear is that often ISPs allow a full speed burst but then throttle for long term steady state data transfer. That matches your reported behavior exactly. This allows customers to run a speed test and have it report full speed but prevent them from getting that speed for a long download such as a full system upgrade or a large install ISO image download. Are you sure your ISP isn't throttling you? BobI wouldn't put anything past those jackasses but am still attempting to gather information. Would wireshark be a good tool to do an in depth diagnosis of the problem? I've gotten a little side tracked with another problem but plan to get back to this in the next couple of days. Any comments will be appreciated.If you have shell access to a box somewhere, you can run "iperf" to get an idea of the performance of the link between you. Obviously, the closer to you, the better. Take a look at the "--interval" parameter, so you can see how/if performance degrades over time. "--dualtest" might also be helpful. There are probably guides out there on how to get the best results from it, the man page doesn't really do much except list all the options. There may be better ways, but this is the one I typically use. Wireshark would be more suited to analyze the actual traffic, if you suspect something may be wrong there. PetterThanks for the tips. Don't go away. As you will find in the newest listings, I have a bigger problem at the moment. I will be back to this one soon.Seen and replied to :)Comment on speed testers. The mostly use UDP packets which will never detect trashed packets. God I hate big business in this country. What ever happened to the antitrust laws I grew up with.iperf will use either TCP or UDP. :) Petter I used iperf3 as follows: iperf3 -c iperf.scottlinux.com The program just hangs. I also tried it with the -R switch with the same result. I then set up one the other computers on my internal net as a server (iperf3 -s) and got the following results: Connecting to host 192.168.1.12, port 5201 [ 4] local 192.168.1.7 port 50916 connected to 192.168.1.12 port 5201 [ ID] Interval Transfer Bandwidth Retr Cwnd [ 4] 0.00-1.00 sec 104 MBytes 875 Mbits/sec 0 67.9 KBytes [ 4] 1.00-2.00 sec 105 MBytes 878 Mbits/sec 0 67.9 KBytes [ 4] 2.00-3.00 sec 105 MBytes 883 Mbits/sec 0 67.9 KBytes [ 4] 3.00-4.00 sec 106 MBytes 892 Mbits/sec 0 67.9 KBytes [ 4] 4.00-5.00 sec 104 MBytes 875 Mbits/sec 0 67.9 KBytes [ 4] 5.00-6.00 sec 104 MBytes 873 Mbits/sec 0 67.9 KBytes [ 4] 6.00-7.00 sec 104 MBytes 875 Mbits/sec 0 67.9 KBytes [ 4] 7.00-8.00 sec 104 MBytes 874 Mbits/sec 0 67.9 KBytes [ 4] 8.00-9.00 sec 105 MBytes 877 Mbits/sec 0 67.9 KBytes [ 4] 9.00-10.00 sec 104 MBytes 874 Mbits/sec 0 67.9 KBytes - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bandwidth Retr [ 4] 0.00-10.00 sec 1.02 GBytes 878 Mbits/sec 0 sender [ 4] 0.00-10.00 sec 1.02 GBytes 877 Mbits/sec receiver iperf Done. My local network seems to be working fine (I tried the -R switch as well. Same good results). Needless to say, I'm using a 100 Mbyte/second network. I am behind a verizon M1424WR rev. I router firewall that has been free of any "known" transmission trouble before. Could the firewall be the problem or has scottlinux.com shut down their iperf3 server. Your comments will be sincerely appreciated. Gary R |