Eric - I was mostly responding to Ric's description of the excessive
load on DHCP servers in the short-lease/long-lease scenario. As I
understand the short-lease/long-lease scenario, if we assume that
authentication takes place in the short-lease window, the load on the
DHCP servers would double. Significant, sure, but not game-changing
in the way Ric implied.
- Ralph
On Nov 6, 2007, at Nov 6, 2007,10:39 PM, Eric Voit (evoit) wrote:
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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