Re: [RRG] Consensus check: renumbering - missing dimension

[Eliot Lear <lear@cisco.com>]

Christopher Morrow wrote:
> stateless-autoconfig is entirely not sufficient for site admins to use
> in a 'renumbering' event. There are many items passed out in DHCP
> responses which are used by the end systems and not included in
> stateless-autoconfig. Existing practices account for these items via
> DHCP in a mostly centralized manner, without these items site-admins
> will be left with no option but to manually touch each device...
>
> Take a moderately large enterprise of 50k systems in a global setting,
> how long will it take to touch each of the 50k devices and change even
> the basics: dns-server, wins-servers, domainname  (assume you can not
> 'trust' the system owner/user to get this right, and assume you have
> limited helpdesk-staff).
>    

End systems don't matter.  They are easy to renumber.  Harder are the 
routers, the name servers, and all the services that are contained 
within a DNS response.  Coordination with upstreams, change of ACLs, 
testing of perimeters, configuration of all IP-address aware systems, 
etc.  Almost none of that is the end host.

Eliot



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