https://www.juniper.net/documentation/us/en/software/junos/interfaces-fundamentals/topics/topic-map/protocol-family-interface-address-properties.html
Protocol Family and Interface Address Properties | Junos OS | Juniper Networks
This section discusses on how to configure protocol family and interface address properties.
protocol familyjunos osinterfaceaddressproperties
https://www.mail-archive.com/search?l=haproxy@formilux.org&q=subject:%22Re%5C%3A+unsupported+protocol+family+2+for+address+%27quic4%400.0.0.0%5C%3A4%22&o=newest&f=1
subject:"Re\: unsupported protocol family 2 for address 'quic4@0.0.0.0\:4"
protocol familysubjectunsupported