Split DNS and auto failover to other site ?

hi,

hope can ask complicated question here?

first describe setup question hope understand mutch beter?

i hope :-d

i have network of 3 site (1 domain) + 1 remote partner site . 
on site 1 , 2 have servers redundancy.site 3 client site
site 1 first site have ipv6
we have remote site forest trust.
internal we use domain name domain.local external domain.org

all servers windows 2012 except sccm server (not upgrade yet)

put in nice diagram:

the isue have following :
use outlookanywhere laptop/remote user can use outlook vpn. goal have subdomain exchange.domain.org. has record external ip of site 1 , 2 , 1 aaaa record srv02 second interface on site1. want run domain domain.org on own dns servers. prefer not install dns servers on network.
problem have in 2 parts

part 1:
want external usages ips external ips of site 1 , 2.
on inside want them use internal ip becouse external ip not reachable inside.
in bind9 on linux can use split dns this. can dit done microsoft dns out installing dns servers?

if answer yes how ? 

part 2: failover , keep trafic local possibly
prefer when body access exchange.domain.org in site 1, want them go srv02 , if in site 2 go srv08. when let srv08 down want them go srv02. can down prefer detection done automatically.

if answer yes how ? 

thanks in advance!!!!

ps. if grammar not totally correct, due to'm dyslexic. sorry there when need clarification please please it?

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with kind regards, bas van den dikkenberg

hello,

for detailed networking questions please ask in http://social.technet.microsoft.com/forums/windowsserver/en-us/home?forum=winservernis&filter=alltypes&sort=lastpostdesc&brandignore=true&page=1

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best regards

meinolf weber
mvp, mcp, mcts
microsoft mvp - directory services
my blog: http://msmvps.com/blogs/mweber/

disclaimer: posting provided no warranties or guarantees , confers no rights.

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