Re: TOS values

On 07/16/2014 11:01 PM, Alex Rousskov wrote:
> On 07/16/2014 11:39 AM, Tsantilas Christos wrote:
>> Hi all,
>> Squid currently does not make a check for the TOS values used in squid
>> configuration file. Squid will accept 8bit numbers as TOS values, however:
>> 1) TOS values with 1st ad 2nd bit set can not be used. These bits used
>> by the ECN. For Linux if someone try to set the 0x23 value as TOS value
>> (which sets 1st and 1nd bits), the 0x20 will be used instead, without
>> any warn for the user.
>>
>> 2) Some of the TOS values are already reserved for example those which
>> are reserved from RFC2597.
>>
>> The above may confuse squid users.
>>
>> Maybe it is not bad idea to:
>> - Warn users when try to use TOS value which uses the ECN bits
>> - Warn users when try to use TOS values which are not reserved. The
>> user will know that this value is free for use.
>>
>> Opinions?
>
>
> This is not my area of expertise, but
>
> * the first proposed warning sound good to me, and
>
> * it is not clear to me whether Squid should avoid using ToS values from
> RFC 2597. It feels like Squid could, in some cases, _set_ those ToS
> values to use RFC 2597 features provided by its network.

I am not proposing to not use TOS values from RFC2697.
I am proposing to warn users when TOS values other than those in
RFC2697 are used.
The user will be able to ignore warning, but at the same time he will
know that this TOS value is free for use.

>
>
> Thank you,
>
> Alex.
>
>
Received on Thu Jul 17 2014 - 10:15:00 MDT