//accel-pppd// supports sending accounting interim updates to RADIUS as indicated in the following document: [[ https://accel-ppp.readthedocs.io/_/downloads/en/latest/pdf/ | name ]]
It indicates the following can be applied in the [radius] section:
**acct-interim-interval=n** By default is not defined.
Specifies the interval in seconds to send accounting information (may be overridden by radius Acct-Interim-Interval attribute)
This configuration setting is not supported in the CLI, nor is the change persistent upon reboot when modifying the /run/accel-pppd/l2tp.conf file.