DFS File Replication Issue - Windows Server 2008 R2

I am having a problem with DFS Replication that I just cannot figure out.

Windows Server 2008 R2

In one building, we are seeing perfect ping times and no dropped packets, but as soon as DFS Replication is enabled, we see 500-800ms and over 50% dropped packets.  And thats the entire internet connection doing that.

I have each DFS replicated folder limited to no more than 128K replication speed.

We have this replicated over to other building with the same exact internet speed (UP/DOWN) with no problems.

This had no problems until late last week now it continues to be a problem.  I have DFS Replication service disabled until I can get this figured out.

Any advise is welcomed.
LVL 1
considerscsAsked:
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arnoldCommented:
Are the two locations on the same LAN or are they going via a VPN?
If VPN, what are the connection rates?

When did this issue begin? Double check the staging area size versus the larger files that need to be replicated.
 Do you deferential compression enabled?
Do you have data collection for your switches?
Snmp polling (cacti.net)
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considerscsAuthor Commented:
The two locations are over a VPN.  The one having the trouble is suppose to be 1 MB upload, but realistically we see 512K most of the time.

RDC is enabled and running on this connection.

I do not have data collection nor snmp polling for the switches.
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arnoldCommented:
If you normally have 512k in use, as soon as replication starts it saturates the connection and leads to VPN drops.
Look at QoS to prioritize VPN over other traffic HTTP, etc. and see whether that helps.
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considerscsAuthor Commented:
It saturates even if I have the replication limited to 128K or less?
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arnoldCommented:
Your existing traffic might be high, without QoS to prioritize VPN traffic over all other, your 128K added to the existing <512k exceeds and the VPN drops.
or your setup is to queue the VPN expires.  You have to have some log record on both sides pointing to an issue.
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considerscsAuthor Commented:
thanks for the help and suggestions.
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Windows Server 2008

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