Synology Docker Instance -> change Network Port

Hello,
the urbackup Docker on a Synology NAS instance works well - however operating on a wrong Network Interface. The log entries show:

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2022-12-08 20:48:09: Server started up successfully!
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.
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2022-12-08 20:48:10: Broadcasting on ipv4 interface eth0 addr 172.17.0.3

eth0 seems to be the default … - however in my case the wrong interface. I need the urbackup server to operate for a different subnet on the Synology device eth3.

How can I change the configuration for the docker instance of urbackup

Thank you
Tobias