Hi,
At 03:26 PM 6/28/98 -0400, William T Wilson <[EMAIL PROTECTED]> wrote:
>On Sat, 27 Jun 1998, Richard Sharpe wrote:
>
>> I talk about how FTP typically sets the HIGH THROUGPUT TOS, and others
>> (like Telnet) set the LOW DELAY TOS. And I mention that modern routers
>> handled packets in the queue based on the TOS flags, and that I suspect
>> that Linux can even do that.
>
>There's been a lot of talk on this subject and I'd like to clarify my
>standpoint. What I'm saying is that once the data arrives on your end of
>the connection, there is nothing you can do about it - the bandwidth has
>already been used. Regardless of how the routers along the way (and
>especially the system you are dialing into, as the dialin is the slow
>link) treat the data, there isn't anything the end user can do about it.
>You, as a client, on the slow end of a dialin line, have no control over
>which data you receive, unless you are connecting through an intelligent
>proxy (located on the fast end) which allows you to set these priorities.
>What the routers do between the client and the remote site is beyond the
>control of the client.
I would have to say that you are absolutely correct. Once the data hits the
machine, there is not much you can do.
If you could get the web server to set low delay on the outgoing packets
and the FTP server to set high throughput (which it should do), then you
may be able to see a difference, as the FTP packets should get a lower
priority than the HTTP packets, however, this depends on both the routers
handling the TOS field correctly (which Ciscos do, I believe) and the PPP
server doing likewise, and I am not convinced that the Linux based ones do
that, but Cisco 5260s may do the right thing.
One needs the PPP server to apply the same procedures because, as you
mention, the PPP link is the slow link and it is more likely that queueing
will occur on the PPP link.
>--
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Regards
-------
Richard Sharpe, [EMAIL PROTECTED], NIC-Handle:RJS96
NS Computer Software and Services P/L,
Ph: +61-8-8281-0063, FAX: +61-8-8250-2080,
Samba, Linux, Apache, Digital UNIX, AIX, Netscape, Stronghold, C, ...
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