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Re: DHCP vs. RA... again.



On Fri, 3 Aug 2007, james woodyatt wrote:
On Aug 3, 2007, at 10:53, Ralph Droms wrote:
James - You're right, RAs would not be made obsolete. RAs would still be used to tell hosts to use DHCPv6; no prefixes or default router info would be included in RAs in this scenario.
Are the network operators who are expressing "the specific requirement" that 
their network not "depend on RA" willing to accept that they still need RA to 
signal nodes that DHCP is required for obtaining prefix information and 
default router addresses?
Or, do they want RA deprecated completely?  If they do, then I wouldn't like 
that.
Uh, I hope you guys aren't serious.  Probably all host-side DHCPv6 
implementations always try to run DHCP regardless of RA bits.  It 
DHCPv6 server doesn't exist.. so what, at worst, a rogue server could 
feed you bad information but that would already be possible with ND/RA 
forgeries.  If it does, bingo.
If the host implementation bothers to implement DHCPv6, vendors would 
be very hard pressed to argue why exactly they shouldn't try running 
DHCPv6 on every time the host connects to a new network if IPv6 is 
enabled.
Note: I have no strong feelings on DHCP vs RA, but IMHO this is just 
pragmatics and reality.
--
Pekka Savola                 "You each name yourselves king, yet the
Netcore Oy                    kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings