I have two PIX firewalls with a DC on each side. When I run DCPROMO to stand up a DC on one side it promotes but does not replicate AD and DNS is not working right. I can ping all ip's fine on both sides of the PIX's. THanks for any help!
Try to configure the second (the new) DC, to use the DNS server of the existing DC.
Try to set a lower MTU on both server - you can test with:
ping -f -l XXXX a.b.c.d
to find the best value.
After the initial dcpromo process, you should configure the AD Sites and Services so that each DC will be in a different site. That way you have more control over future AD replication.
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