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Thread: Identifier Wrap-around




Identifier Wrap-around
country flaguser name
Singapore
2007-06-08 06:06:27
What happens, if the number of Requests exceeds 255 in an EAP-Conversation?

Will the Identifier wrap-aroud to zero after 255?
If yes, then wouldnt EAP regard this as duplicate packet, as the Identifier field in new Request packet is less than the previous Request packet ?

Thanks and Regards
Mahesh


The idiot box is no longer passe; It's making news and how!
Re: Identifier Wrap-around
user name
2007-06-08 06:13:47
Mahesh Dantakale wrote:
> 
> The Identifier is one ocetet field and unique for each
EAP-Request.
> What happens, if the number of Requests exceeds 255 in
an
> EAP-Conversation?
> 
> Will the Identifier wrap-aroud to zero after 255?  If
yes, then
> wouldnt EAP regard this as duplicate packet, as the
Identifier field
> in new Request packet is less than the previous Request
packet ?

The identifier doesn't have to be unique for each
EAP-Request:

   In order to avoid confusion between new Requests and
   retransmissions, the Identifier value chosen for each new
Request
   need only be different from the previous Request, but
need not be
   unique within the conversation.

and it's not necessary even an increasing sequence:

   EAP does not require the Identifier to be monotonically
increasing,

So identifier sequence 0,1,0,1,0,1 would be equally
acceptable
as 253,254,255,0,1,2 ...

Best regards,
Pasi
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