Re: NATFW issue: Lifetime error messages

[writing with chair's hat off, i.e., as NATFW NSLP author only!]

Hi,

I do assume that everybody is also fine with this proposed change.

If not, please speak up now!

Thanks, 

  Martin (as NATFW NSLP author)

Am 24.01.2008 11:39 Uhr schrieb "Martin Stiemerling" unter
<[email protected]>:

> [writing with chair's hat off, i.e., as NATFW NSLP author only!]
> 
> Hi all,
> 
> When reading Section 3.4.  Calculation of Signaling Session Lifetime I
> stumbled over the error messages send when NFs or the NR reject the session
> lifetime. 
> 
> Currently, there are two error codes (thus also cases) defined:
> 0x02: Requested lifetime is too big.
> 0x10: Requested lifetime is too small.
> 
> These two error cases are used to tell the NI whether the requested lifetime
> has an issue *and* if the by an NF/NR modified lifetime has an issue (see
> Section 3.4 before figure 12). This is a bit overloaded, as the NI eventually
> cannot tell whether his lifetime proposal was bad or if the en-route changed
> lifetime as bad. 
> 
> My change proposal:
> Keep these error codes 0x02 and 0x10 for rejection of NI's lifetime proposal
> and add two new error codes for rejection of a modified lifetime:
> 0xXY: Modified lifetime is too big.
> 0xSD: Modified lifetime is too small.
> (0xXY and 0xSD must be replaced by real number later on)
> 
> Those messages are generated as an error response if one of the NFs or the NR
> has changed in away that other NFs cannot accept it anymore. This, at least,
> gives the NI the hint that the NFs/NR on the way have some trouble on agreeing
> a lifetime value.
> 
> 
>   Martin
> 
>  
> [email protected]
> 
> NEC Laboratories Europe - Network Research Division
> 
> NEC Europe Limited | Registered Office: NEC House, 1 Victoria Road, London W3
> 6BL | Registered in England 2832014
>  
> 
> 
> 
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