Quick google search suggests that there was(is?) a bug in ISC DHCP client:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=717217
Workaround suggested in other bug I found suggests calling
ethtool -K veth* tx off
(where veth* is the name of your veth interface) directly on Omnia. Other option might be trying different dhcp client - for example systemd-networkd.