replication between sites

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I have fairly good bandwidth between 3 sites in 3 separate locations. the current replication interval is 15 minutes, I checked this at the site settings.
I believe these 15 minutes apply to DNS changes as well. And it seems to be the case - when I change a record on one domain controller, I see the serial increase, etc just fine on the other DC in the same site, but other sites receive these updates several minutes later.
So I have a real business need to speed up DNS replication and take it down to even a minute if possible.

Can I just lower that site replication interval to 1 minute? I am fairly certain my domain controllers and the bandwidth can handle it, and I would obviously do it in steps - but so is this the right way to approach the DNS replication? or is it enough to approach it the DNS way and play with the refresh/TTL values? we're talking about an integrated zone of course, but one that is actually not used by the directory itself.

thanks
Gabor

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