network speed question

[Joseph C. Lininger]

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I'll be honest with you, generally if things are not working right it is 
not a question of tcp settings. I suggested it only because I was saying 
I'd be interested in knowing if making them identical in Windows and 
Linux made the transfer speeds in both operating systems equal. See each 
uses different default settings. If you are having a speed issue with a 
direct connection between two computers, you will want to investigate 
the tcp settings, but also the following things.

1. The routing tables on both ends, especially if one of the machines 
has more than one ethernet interface. Check that packets are not being 
accidentally routed to the wrong interface.
2. Are transfers in either direction effected, or only in one direction?
3. Do you imploy anything like iptables that may be either blocking or 
redirecting some of the packets?
4. Is there a possibility that there is something wrong with the cable 
you are using?
5. Finally, does the Linux machine (the server, the one with internet 
access) have access to DNS or is there an entry in /etc/hosts for the ip 
address of the laptop? This can cause things to slow down because things 
that you wouldn't expect will issue a query for a host name. If the 
laptop runs Linux, it probably wouldn't hurt to list the machine you are 
connecting to in /etc/hosts too.

- -- 
It's not one damn thing after another, it's the same damn thing over and
over. (History repeats itself)
Joseph C. Lininger
jbahm at pcdesk.net
Verification: 5eab38a77ac40416e075be8f50607ff7

And so it came to pass that on Thu, 21 Jul 2005, Lorenzo Taylor said

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> I found the mtu setting originally and changed it first.  It seems that a
> setting of 100 at both ends of the connection approximately doubles the transfer
> speed between the two computers but greatly slows down the laptop's transfer
> speed from the internet.  The window size setting may fix this, but I'm not sure
> how to set it.  It seems that ethtool doesn't find any information about the
> cards on either end of the network cable.
>
> - From the PC:
>
> ethtool eth1
> Settings for eth1:
> No data available
>
> - From the laptop:
>
> ethtool eth0
> [same result]
>
> man ifconfig and ethtool both provide no information regarding window size.
>
> Thanks for any help,
> Lorenzo
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