First off let me say I know this has been a frequent question posted here regarding slow upload speeds on the UTM. I have been a UTM user for well over a decade probably closer to 15 years. I may not be a Bob expert but I know my way around the software.
I recently got an ATT symmetric 1GB fiber line and plugged it up to my UTM VM. At first, performance was normal and expected. I was getting close enough to max throughput with the understanding that I would be getting less because it was running in a VM on older hardware. All fine. Then one day, and I honestly don't know when, upload performance just took a nose dive. I would get 3-5Mbps on uploads. Sometimes spiking to 7%.
I did all the normal things, turned off IDS, turned off web filtering, confirmed 1500 MTU on all NICs, you name it. I have a small Ubiquiti FW as a backup and it was able to get full 1Gb from all my VM's and my physical boxes, so I know my internal network is fine and can handle it. I even built not 1 but 2 brand new UTMs. One I did a restore of a config and another I did unconfigured, no settings. The performance of all these UTMs is the same 5Mbps upload. Download speeds are fine and close to theoretical maximums. I am at a complete loss. I do NOT want to migrate my services to Ubiquiti. I want to keep using the UTM. What else can I do? there are no IDS or filtering logs to check since all of that is disabled. Is this an ATT thing? Is there some special setting I need to make on the ATT FW or UTM interface setting I need to make to get this to work? It doesn't have to be perfect, but symmetrical upload is all I want.
With 100MBit we see this behaviour with fixed interface-speed settings from ISP.
Should not be relevant with 1GBit connection ... but you may try different interface settings ... change from "auto" to "1000baseT/Full"
Interfaces & Routing // Interfaces // Hardware // ...
Systema Gesellschaft für angewandte Datentechnik mbH // Sophos Platinum PartnerSophos Solution Partner since 2003 If a post solves your question, click the 'Verify Answer' link at this post.
Went looking under interfaces... hardware. The only options available to the VMXNET3 adapters is HA monitoring and virtual MAC. I guess the virtual UTM is smart enough to know physical layer options aren't available to it. I thin my next guess is to try with E1000 NICs and see if that matters.
Possible you can change the interface-settings at VMWARE-level