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SBS 2003 in NAT configuration dropping packets

Posted on 2004-03-24
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Last Modified: 2012-08-14
We are having a situation with our Windows SBS 2003 server dropping packets.  The machine is setup as a NAT device for our network and handles DHCP, DNS, Exchange, etc.  We have 2 T1's bound together on the outside and we consistently use a megabit or more of bandwidth throughout the day.  Our stock feeds will occassionally drop as will various web pages.  Is there any way to increase the NAT buffer or some other config item I need to change?  Thanks in advance, because this is really frustrating.
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Question by:wrsinclair
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by:ministry92
ID: 10669173
how do you know where the packets are dropped?  a couple t1's of traffic is nothing to cause much trouble.  

How are the t1's boud together?  Cisco?  I bet mroute-cache  and route-cache is on those interface...and they are doing round robin style routing.. that will cause packet loss every time... or maybe not.
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by:wrsinclair
ID: 10669231
My initial thought was that problem WAS in the Cisco config, but I'm not a Cisco guy.  Can you tell me more about mroute-cache and route-cache?  We are planning to reprogram the router tonight if need be.
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by:wrsinclair
ID: 10709519
The problem ended up being related to DNS lookups from the LAN.  The SBS server does not handout the public DNS servers by default and it was being overwelmed while trying to pass forwarding requests.  I added the public DNS servers to the scope options and the problem seems to have gone away.
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