11-12-2009 11:42 PM - edited 03-04-2019 06:42 AM
Hallo,
I got curious problem on my c1802.
I updated IOS from 12.4.15t6 to 15.0.1M and then back to 12.4.24.t2 and meny times I change ADSL firmware too.
Noticed that my original ADSL FW 3.0.14 was in new IOS 15 builds useless because established connection was only 7Mb instead of 15Mb in down so I try newer firmware 4.0.3, 13, 15 and still same problem, then I downgrade IOS to 12.4.24T2 and still same, I find out that I must use 3.0.10 firmware and got full line speed 15Mb/766kb all newer had hald DL speeds. Now I running on 12.4.24T2 and 3.0.10 FW and have problem with downloading files using FTP. It starts about full speed 1.0-1.4MB/s and skips to 300KB and up down and finaly it after 5 sec leave about 600KB/s, measured from my ISP FTP server on Filezilla client. The downloading using HTTP not have so big fluctuation and run on 1MB - 1,1MB/s
ATM MTU was 1452 and BVI was 1412 I changed to 1492 / 1452
Looks like some buffer overflow.
Thanks for any help.
11-13-2009 08:57 AM
Unless you're using PPPoE, you should not change any MTU from default of 1500.
11-13-2009 09:12 AM
Ok thanks I will try setup 1500 but I thing that this wil not be main reason of problem
11-13-2009 09:14 AM
Anyway for the router, FTP or HTTP is just the same so that is not a router problem neither.
11-13-2009 09:31 AM
Not sure if ftp is moste brutal trafic protocol than http
11-13-2009 09:33 AM
There is no "brutal" qualifier in TCP-based network protocols. I assume you are not in this profession.
11-13-2009 09:54 AM
I know and hope that you will understand that.
We not discuss someones profesionality but my problem.
Both can confirms that ftp is more than http in traffic needs
11-13-2009 09:57 AM
No, it is not. Then, you can believe what you want.
11-13-2009 10:09 AM
So you thing it is ISP ?
11-13-2009 10:10 AM
It's a slow FTP server.
11-13-2009 10:14 AM
I tryed my ISP FTP and ftp of university in my city and still same.
11-13-2009 10:17 AM
It is common practice to limit the speed of a single session of FTP servers, do you know that ?
Again: FTP and HTTP are the same for the router.
You should instead fix the MTU that was changed for no reason.
11-13-2009 10:21 AM
Not by my ISP
MTU was 1452 but not know why so I changed to 1492 by cisco document about PppoE
11-13-2009 10:24 AM
Do you work for the ISP so you know for sure how their servers are configured ?
Do you have PPPoE ? If so, you should not have BVI for DSL.
Anyway, the point stays the same: If FTP is slower than HTTP, that is not router fault.
11-13-2009 10:48 AM
Not but have friend there
pppoe yes bvi bridge because have 1802w and wifi is bridged to lan
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