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New Member

FTP speed on a half c1802

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.

19 REPLIES
Hall of Fame Super Gold

Re: FTP speed on a half c1802

Unless you're using PPPoE, you should not change any MTU from default of 1500.

New Member

Re: FTP speed on a half c1802

Ok thanks I will try setup 1500 but I thing that this wil not be main reason of problem

Hall of Fame Super Gold

Re: FTP speed on a half c1802

Anyway for the router, FTP or HTTP is just the same so that is not a router problem neither.

New Member

Re: FTP speed on a half c1802

Not sure if ftp is moste brutal trafic protocol than http

Hall of Fame Super Gold

Re: FTP speed on a half c1802

There is no "brutal" qualifier in TCP-based network protocols. I assume you are not in this profession.

New Member

Re: FTP speed on a half c1802

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

Hall of Fame Super Gold

Re: FTP speed on a half c1802

No, it is not. Then, you can believe what you want.

New Member

Re: FTP speed on a half c1802

So you thing it is ISP ?

Hall of Fame Super Gold

Re: FTP speed on a half c1802

It's a slow FTP server.

New Member

Re: FTP speed on a half c1802

I tryed my ISP FTP and ftp of university in my city and still same.

Hall of Fame Super Gold

Re: FTP speed on a half c1802

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.

New Member

Re: FTP speed on a half c1802

Not by my ISP

MTU was 1452 but not know why so I changed to 1492 by cisco document about PppoE

Hall of Fame Super Gold

Re: FTP speed on a half c1802

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.

New Member

Re: FTP speed on a half c1802

Not but have friend there

pppoe yes bvi bridge because have 1802w and wifi is bridged to lan

Hall of Fame Super Gold

Re: FTP speed on a half c1802

Do you have ip tcp adjust-mss 1452 (not mtu) under BVI ?

New Member

Re: FTP speed on a half c1802

yes In dialer have mtu 1492 in bvi have mss 1452

Hall of Fame Super Gold

Re: FTP speed on a half c1802

All good, problem is something else then.

New Member

Re: FTP speed on a half c1802

Thank you will make more investigation but any help welcommed

New Member

Re: FTP speed on a half c1802

I have done some testing and found that 1802 is really at half speed.

When I connected other ADSL modem FTP works about 1,2-1,4MB/s when I conected this modem to 1802 FE0 port speed was same 1,2-1,4MB/s, when usind 1802 integraded ADSL speed is on half. This testing was done on basic NAT,Routing and basic FW. What can be problem is that 1802 is more sensitive to not good qulity of ADSL line or something else.

Some ideas?

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