First of all, there is no way use of PANA would lead to more DHCP traffic.
How can that be true when carrying EAP over DHCP always at the minimum
contribute 2 additional round-trips just for the sake of transporting EAP?
In the worst case (DHCP-configured pre-PANA address), there are two round
trips for that 1st DHCP. Even in that case PANA is no worse than DHCP-auth.
And then there are better cases, e.g. use of link-local address as pre-PANA
address, rapid commit, etc.
As for your 11-msg PANA call flow count, the example you used is the most
verbose one. If you turn on the optimizations (agent-side initiation,
piggybacking) it reduces to 2 round trips.
So, in the worst case scenario (full dhcp, pana, another full dhcp), PANA
has additional 2 round-trips. By kicking in more optimized deployment
choices, this difference can be diminished.
Alper
> -----Original Message-----
> From: Eric Voit (evoit) [mailto:[EMAIL PROTECTED]
> Sent: Wednesday, November 07, 2007 5:40 AM
> To: Ralph Droms (rdroms)
> Cc: [EMAIL PROTECTED]; Internet Area
> Subject: RE: [Int-area] Re: [dhcwg] Discussion of dhc WG rechartering
> forDHCPauthentication
>
> > From: Ralph Droms, November 05, 2007 9:37 PM
> >
> > Does the short lease/long lease scenario scale the DHCP
> > server load by more than a factor of two?
>
> Ralph,
>
> The messages the DHCP servers will double.
> The messages with L3 edge (BRAS) will more than double.
> The messages with the CPE will more than triple.
>
> (Below is some rough math. I might have missed a message or two, but the
> general trend is what I am trying to show.)
>
> -----------------------------------------
> CPE Messages
> -----------------------------------------
> DHCP Auth, assuming a 2 message EAP Method, the messages used by EAP
> would be equal
> + 6 Messages (draft-pruss-dhcp-auth-dsl-01)
>
> PANA+DHCP Method
> + 4 Messages: DHCP 1st IP address
> ~ (+2) DHCP renews per 60 seconds until authenticated
> + 11 Messages PANA with BRAS (draft-ietf-pana-pana-18, section 4.1)
> + 4 Messages: DHCP 2nd IP address
>
> -----------------------------------------
> L3 Edge (BRAS) Messages
> -----------------------------------------
> DHCP Auth, EAP Method
> + 8 Messages (draft-pruss-dhcp-auth-dsl-01)
>
> PANA Method
> + 4 Messages: DHCP 1st IP address
> ~ (+2) DHCP renews per 60 seconds until authenticated
> + 11 Messages PANA with CPE (draft-ietf-pana-pana-18, section 4.1)
> + 2 messages min for validating with EAP Server
> + 4 Messages: DHCP 2nd IP address
>
> -----------------------------------------
> L2 Edge (DSLAM or Access Switch) Messages
> -----------------------------------------
> DHCP Auth, EAP Method
> + 6 Messages snooped (draft-pruss-dhcp-auth-dsl-01)
>
> PANA+DHCP Method
> + 4 Messages Snooped: DHCP 1st IP address
> ~ (+2) DHCP renews per 60 seconds until authenticated
> If snooping: 11 Messages PANA (draft-ietf-pana-pana-18, section 4.1)
> Else if explicit policy distribution like ANCP, ~4 messages (one policy
> per address)
> + 4 Messages Snooped: DHCP 2nd IP address
>
>
> Eric
>
>
> > - Ralph
> >
>
>
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