AW: Zero as ospfIfRetransInterval

Schrodi Karl <karl.schrodi@SIEMENS.COM> Thu, 26 June 2003 08:15 UTC

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Date: Thu, 26 Jun 2003 10:03:05 +0200
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From: Schrodi Karl <karl.schrodi@SIEMENS.COM>
Subject: AW: Zero as ospfIfRetransInterval
To: OSPF@PEACH.EASE.LSOFT.COM
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Hi Acee,

I fully understand that retransmission is mandatory - but does it really make sense to have a retransmission interval of zero? Wouldn┬┤t it be like some kind of a DoS attack against yourself and your neighbour(s)?

Well, probably nobody reasonably will set this interval to zero - but ...

I would prefer something like the previous proposal of Vishwas, i.e. putting a limitation in the object description in the MIB.

Regards
Karl


-----Urspr├╝ngliche Nachricht-----
Von: Acee Lindem [mailto:acee@REDBACK.COM]
Gesendet: Mittwoch, 25. Juni 2003 19:03
An: OSPF@PEACH.EASE.LSOFT.COM
Betreff: Re: Zero as ospfIfRetransInterval


Eric Gray wrote:
> Acee,
>
>     Why would it be wrong to set a retransmit interval to zero?  Usually,
> setting a retransmit interval to zero would have the special meaning that
> retransmission does not occur (i.e. - the interval is infinite).  Is that not
> an intended meaning in this case?

Nope - not retransmitting would make the flooding unreliable and
would violate the base protocol specification (RFC 2328).

>
> Acee Lindem wrote:
>
>
>>Manral, Vishwas wrote:
>>
>>>Hi Acee,
>>>
>>>If we do not intend to define new variables, we may want to at least put the
>>>limitation of 0, in the object description in the MIB.
>>
>>Hi Vishwas,
>>
>>That sounds like a good idea since any implementation that allows
>>write access to set the variables to 0 is broken.
>>
>>Thanks,
>>Acee
>>
>>
>>>Thanks,
>>>Vishwas
>>>
>>>-----Original Message-----
>>>From: Acee Lindem [mailto:acee@REDBACK.COM]
>>>Sent: Tuesday, June 24, 2003 18:16
>>>To: OSPF@PEACH.EASE.LSOFT.COM
>>>Subject: Re: Zero as ospfIfRetransInterval
>>>
>>>
>>>Hi Dan,
>>>
>>>Daniel Joyal wrote:
>>>
>>>
>>>>You're not allowed to change the syntax unless
>>>>it's equivalent to the old syntax.
>>>
>>>
>>>Even if the old syntax doesn't match the protocol
>>>specification?
>>>
>>>
>>>
>>>
>>>>So in this
>>>>case, we would need to deprecate/obsolete.
>>>
>>>
>>>Then I don't think it is worth defining
>>>new MIB variables given that ospfIfTransitDelay,
>>>ospfIfRetransInterval, ospfVirtIfTransitDelay, and
>>>ospfVirtIfRetransInterval have served us thus far.
>>>
>>>Other opinions are welcome.
>>>
>>>Thanks,
>>>Acee
>>>
>>>
>>>
>>>>-Dan
>>>>
>>>>
>>>>>-----Original Message-----
>>>>>From: Acee Lindem [mailto:acee@redback.com]
>>>>>Sent: Monday, June 23, 2003 11:35 PM
>>>>>To: Mailing List; Joyal, Daniel [BL60:NP30:EXCH]
>>>>>Subject: Re: Zero as ospfIfRetransInterval
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>Igor Miroshnik wrote:
>>>>>
>>>>>>All,
>>>>>>
>>>>>>Can anybody clarify the physical sense of assigning
>>>>>>ospfIfRetransInterval to zero? RFC1850 allows such an assignment.
>>>>>
>>>>>I believe UpToMaxAge should range from 1..3600 rather than 0..3600.
>>>>>
>>>>>Dan - can we change this in the MIB update without
>>>>>deprecating variables?
>>>>>
>>>>>
>>>>>>Thanks
>>>>>>
>>>>>
>>>>>
>>>>>--
>>>>>Acee
>>>>>
>>>>>
>>>>
>>>
>>>--
>>>Acee
>>>
>>
>>--
>>Acee
>
>
>
>


--
Acee