We have the following configuration:
- Windows Server 2008 is installed on Vmware Esxi 4.1 server
- physical machine - HP server with plenty of resources and no other VMs installed yet.
- Server 2008 is a domain controller and has Forefront TMG 2010 installed
- (by the way, is it a valid config?)
- Forefront uses local dns server which serves internal AD infrastructure, and uses forwarders to ISP DNS
- The server connects to a satellite modem idirect x3, via 100 Mbit unmanaged switch.
Periodically, Web pages start loading with a delay or fail altogether.
I think that it looks like DNS issue but I also think it's not. I've noticed that pinging internet addresses from the server itself at the time when the problem emerges shows the following results:
- the first one or two ping fails and the rest work fine.
- The next ping to the same domain name or ip address is completely successful.
- And not a single ping is lost in a series of ping of any size of series after the initial connection is established.
The same thing is with web browsing - downloads of large files have stable speed.
The current type of network adapter is E1000. I'm going to try VMXNET3 today.
Maybe that is speed/duplex settings issue - I've tried both autonegotiate and 100 mb full duplex hard set.
By the way, is there a way to check the setting that the devices agreed upon after autonegotiation?
And I have to note the specifics of the satellite connection - ping time is approximately 600 ms. What I've already tried to do:
- turned off tcp offloading
- turned on mtu discovery
Any help will be greatly appreciated.