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UTM 9 slow upload speed

Hi all,

I have an UTM 9.705-3 running in a KVM VM. My ISP line is a FTTO 100Mbits. The server runs a second VM - Ubuntu 20.04 - from where I make the tests. Problem is that I get a correct download from the Ubuntu machine, but not the upload. I use the command

wget --no-check-certificate -O - raw.github.com/.../speedtest.py | python

taken from this forum to make my tests. If I run it from the UTM I get correct values in both directions knowing that this is a production server

Retrieving speedtest.net configuration...
Testing from SFR (xxx.yyy.13.50)...
Retrieving speedtest.net server list...
Selecting best server based on ping...
Hosted by Ikoula (Reims) [131.50 km]: 22.438 ms
Testing download speed................................................................................
Download: 92.03 Mbit/s
Testing upload speed................................................................................................
Upload: 79.31 Mbit/s

Same test from the Ubuntu VM

Retrieving speedtest.net configuration...
Testing from SFR (xxx.yyy.13.50)...
Retrieving speedtest.net server list...
Selecting best server based on ping...
Hosted by Naitways (Paris) [1.88 km]: 18.516 ms
Testing download speed................................................................................
Download: 92.45 Mbit/s
Testing upload speed................................................................................................
Upload: 16.89 Mbit/s

As you can see 79.31 vs 16.89 ! MTU is setted to 1500, no DHCP involved to get the IP address on this link. No IPS nor traffic shaping nor Qos.

Has someone any clue about what could be the source of the problem ?

Cheers, Daniel



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  • FormerMember
    +1 FormerMember

    Hi ,

    Thank you for reaching out to the Community! 

    Is Anti-DoS/Flooding configured under Network Protection > Intrusion Protection? 

    Can you check if there are any interface level drops? Run ifconfig and check the result. 

    When you run the speed test on UTM, the generated traffic does not go through the filters. 

    Thanks,

  • Hi H_Patel

    I disabled every filters, with ATP disabled I gained 5~6 Mbits, not more. I reabled everything and decide to reboot the UTM: the magic happend, I got back my upload !

    Many thanks for your support. BTW how can I install packages on UTM (eg iperf) ?

    Regards, Daniel.

  • Seems I replied to fast :( The problem appears again, not so dramatically but from saturday to now we loosed again 30 Mbits upload. So something is irremediably dropping the traffic. From ifconfig, I see

    RX packets:114946841 errors:675231 on eth0 the mother of interfaces (4 VLANS: WAN FTTO, WAN SDSL, Voice net, Invite net)

    RX packets:203828667 errors:0 dropped:2021155 on eth1 which is the LAN interface

    Any clue ?