I've inherited a multi-site WAN and I'm trying to clean up the AD replication (Event Viewer is full of DS and FRS errors). I've also removed a DC that had been off-line for at least a year (the joys of ntdsutil!).
Central site is head office, the other four sites are branches
Central site has two DCs, each branch has it's own DC
The inter-site connectivity is IPSEC VPNs (each site is a /24).
There are no IP routes between the branches - there is no general need for this in terms of applications or users (some of the VPN routers also can't handle more than one subnet at the remote end, so a hub & spoke VPN isn't an option and I really dont want to setup loads more tunnels)
As an example, the DC at site B is logging errors about not replicating with the DC at sites C & D.
Under AD Sites & Services, I sorted things out. Each physical site has the relevant server(s) in it, with it's subnet defined and associated. I have four Site Links defined (all with a cost of 100):
A>B
A>C
A>D
A>E
Under Properties for Inter-Site Transports > IP, "Bridge All Site Links" is ticked. Reading around it seems that as the network doesn't have full IP routing, this should be un-ticked (though I've not done that yet).
What I'm a bit confused about is which sites I would then put into an Inter Site Bridge(s), thus allowing (as an example), the DC at site B to replicate with whichever other DC it takes a fancy too.
Would one ISB do the job? Or do I need more?
Central site is head office, the other four sites are branches
Central site has two DCs, each branch has it's own DC
The inter-site connectivity is IPSEC VPNs (each site is a /24).
There are no IP routes between the branches - there is no general need for this in terms of applications or users (some of the VPN routers also can't handle more than one subnet at the remote end, so a hub & spoke VPN isn't an option and I really dont want to setup loads more tunnels)
As an example, the DC at site B is logging errors about not replicating with the DC at sites C & D.
Under AD Sites & Services, I sorted things out. Each physical site has the relevant server(s) in it, with it's subnet defined and associated. I have four Site Links defined (all with a cost of 100):
A>B
A>C
A>D
A>E
Under Properties for Inter-Site Transports > IP, "Bridge All Site Links" is ticked. Reading around it seems that as the network doesn't have full IP routing, this should be un-ticked (though I've not done that yet).
What I'm a bit confused about is which sites I would then put into an Inter Site Bridge(s), thus allowing (as an example), the DC at site B to replicate with whichever other DC it takes a fancy too.
Would one ISB do the job? Or do I need more?