Hello,
this is a problem which randomly appears and I've never been able to track it fully down or get rid of it.
I've got three different UTM installations (two appliances, one VM), all 9.3x, where we get "host not found" and/or very slow connection speed as soon as a big, long lasting upload happens. Our DNS is configured according to the "DNS best practice": Clients -> Internal DC/DNS -> UTM -> Google public DNS;
This is happening on asymmetric ADSL Lines (down 8 MBit, up 400-600 kBit), it doesn't happen on HDSL configurations with more than 1 MBit uplink.
We've tried with and without QoS and fine-tuning of the corresponding interface configurations (LAN and WAN) with no success.
Even if we manually limit the uplink speed client-side to about 300 kBit per upload, the problem persists.
What could be wrong in our setups?
Best regards,
TP
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