ftp problem

Hi

I want to buy hosting at awardspace.com but I have a problem with access
via ftp (in the passive mode, active did not work). Other ftp accounts
working well. It is not possible to upload files larger than a few
hundred bytes. When I try to send a larger file (for example, 11KB .txt)
there is like a hang the FTP client (I tried various clients with the
same effect). I have access to the Internet (ADSL), divided into two
computers by computer from Leaf Bering v1.2.
When direct access to the Internet - without a computer from Bering -
ftp works well.
Maybe this will help: http://pw2.republika.pl/b/view_system.htm

Thank you
Pawel

Scott Hemphill wrote:
> p <(E-Mail Removed)> writes:
>
>> Hi
>>
>> I want to buy hosting at awardspace.com but I have a problem with
>> access via ftp (in the passive mode, active did not work). Other ftp
>> accounts working well. It is not possible to upload files larger than
>> a few hundred bytes. When I try to send a larger file (for example,
>> 11KB .txt) there is like a hang the FTP client (I tried various
>> clients with the same effect). I have access to the Internet (ADSL),
>> divided into two computers by computer from Leaf Bering v1.2.
>> When direct access to the Internet - without a computer from Bering -
>> ftp works well.
>> Maybe this will help: http://pw2.republika.pl/b/view_system.htm
>
> It sounds like the MTU might not be set correctly on your firewall.
> It might have to be decreased. What does ifconfig tell you about the
> ADSL interface?

People frequently have MTU problems when they indiscriminately block all
ICMP, too. MTU discovery requires ICMP to work.

Allen Kistler pisze:
> Scott Hemphill wrote:

>> It sounds like the MTU might not be set correctly on your firewall.
>> It might have to be decreased. What does ifconfig tell you about the
>> ADSL interface?
>
> People frequently have MTU problems when they indiscriminately block all
> ICMP, too. MTU discovery requires ICMP to work.

Please see:
http://pw2.republika.pl/b/viewnet.htm
This is it ?

ifconfig: not found.


Thank you
Pawel

Scott Hemphill pisze:
>
> Oh, you don't have ifconfig. Try "ip addr".
>
> Scott

I repair this. Thank you very much. I changed MTU on Windows computer -
for 1452. I don't know what MTU was previously.

ip addr return something like this:
http://pw2.republika.pl/b/viewnet.htm
in ::Interfaces:: section

Thank you
Pawel

Scott Hemphill pisze:

> I'm glad that you've got it working. Of course, the correct place to
> fix this is on the firewall. You've got your Windows computer
> working, but if you connect another computer to your firewall, you
> could have the same problem.
>
> Scott


What am I correct in firewall ?
MTU 1492 ?
MTU 16436 ?

Clifford Kite pisze:

> Try "man iptables," search for TCPMSS, and read about the suggested
> "Workaround."

It's too complicated. I stay with current state.

p wrote:
> Clifford Kite pisze:
>
>> Try "man iptables," search for TCPMSS, and read about the suggested
>> "Workaround."
>
> It's too complicated. I stay with current state.

Also clamping the MSS only works for TCP. Clamping the MSS is
considered a kludge. Enabling MTU discovery by not blocking ICMP is
preferable and works for all protocols.