This weekend my ISP upgraded my connection to 150Mbps down / 15Mbps up.
That of course is great, but unfortunately I had to use another modem for this which they also sent me.
The modem is a Cisco EPC3928AD. It looks like it's not possible to configure this device as a bridge so I may be stucked with my UTM behind this NAT device.
I have already given my UTM a static IP in the range of the modem and setup the modem to use this address as a DMZ but some strange things are happening:
One of these problems is that when opening webpages it takes several seconds (4-20) before anything starts to happen and then all of a sudden the pages load very quickly.
I don't see anything suspicious in firewall, IPS or webfiltering logs which would explain this.
I'm using UTM 9.2 beta 9.185-3 but these problems weren't there before my ISP upgraded my connection so I don't yet suspect the beta firmware to be the culprit.
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