On linux the net-tools suite of utilities has been long since deprecated. The relevant code that gets executed on Fedora and EPEL should be identified and patched out, with a suitable pull request upstream, to remove the dependency on any tool in the net-tools package and instead use suitable tools form iproute2.
This bug appears to have been reported against 'rawhide' during the Fedora 28 development cycle. Changing version to '28'.
x2goserver-4.1.0.3-3.el7 has been submitted as an update to Fedora EPEL 7. https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2019-89aec11a36
x2goserver-4.1.0.3-3.fc29 has been submitted as an update to Fedora 29. https://bodhi.fedoraproject.org/updates/FEDORA-2019-d619ad6f1d
x2goserver-4.1.0.3-3.fc30 has been submitted as an update to Fedora 30. https://bodhi.fedoraproject.org/updates/FEDORA-2019-188c23d14a
x2goserver-4.1.0.3-3.fc28 has been submitted as an update to Fedora 28. https://bodhi.fedoraproject.org/updates/FEDORA-2019-471e610377
x2goserver-4.1.0.3-3.fc30 has been pushed to the Fedora 30 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2019-188c23d14a
x2goserver-4.1.0.3-3.fc28 has been pushed to the Fedora 28 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2019-471e610377
x2goserver-4.1.0.3-3.el7 has been pushed to the Fedora EPEL 7 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2019-89aec11a36
x2goserver-4.1.0.3-3.fc29 has been pushed to the Fedora 29 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2019-d619ad6f1d
x2goserver-4.1.0.3-3.fc30 has been pushed to the Fedora 30 stable repository. If problems still persist, please make note of it in this bug report.
x2goserver-4.1.0.3-3.fc28 has been pushed to the Fedora 28 stable repository. If problems still persist, please make note of it in this bug report.
x2goserver-4.1.0.3-3.fc29 has been pushed to the Fedora 29 stable repository. If problems still persist, please make note of it in this bug report.
x2goserver-4.1.0.3-3.el7 has been pushed to the Fedora EPEL 7 stable repository. If problems still persist, please make note of it in this bug report.