Re: IP-TOS-Flags

Andrew M. Bishop <amb-Uxr6IM1mbv2TY6FTCsQk+9Bc4/[email protected]> wrote:
> Joerg Sommer <[email protected]> writes:
>
>> Andrew M. Bishop <amb-Uxr6IM1mbv2TY6FTCsQk+9Bc4/[email protected]> wrote:
>> > Joerg Sommer <[email protected]> writes:
>> >
>> >> does wwwoffle set the ip TOS flag? Maybe is 'Minimize monetary cost' set
>> >> while fetching or 'Maximize throughput' for ftp (as requested in RFC
>> >> 1349) set?
>> >
>> > There are no TOS options set in WWWOFFLE for any of the types of
>> > connection that it makes.
>> >
>> > It is difficult to know which of the TOS options would be the best one
>> > for WWWOFFLE to use:
>
>> I didn't find any definition how the TOS flags should be used with http
>> and I don't have any idea which flag to use. But there is a definition
>> for ftp in the RFC 1349.
>
> The definition in RFC 1349 is actually just a copy of a table from
> RFC 1060 which is obsoleted by RFC 1340 which is obsoleted by RFC 1700
> which is obsoleted by an online reference (see RFC 3232).

So now http://www.iana.org/assignments/ip-parameters is the standard and
that's the same as 1349.

>>From this is would seem that HTTP could be low delay or high
> throughput since they may interact with the user and may have large
> blocks of data.

Yes.

>> Because wwwoffle does also support ftp and for ftp a usage of the TOS
>> flags is defined, wwwoffle should at least support this.
>
> It is recommended, not defined as a requirement.

I talked to some people and they told me TOS isn't respected in internet.
There is a high potential of abuse which causes the carrier to ignore the
TOS bits. But I found also some hosts that set the bits. e.g.
www.google.de or ftp.kernel.org do so.

Jörg.

-- 
Alles, wovor wir Angst haben müssen, ist die Angst selbst.
       	     	       	     	     	 (Fraklin D. Roosevelt)