Hey, > Is it #:multicast-on or #:allmulticast-on ? The "ip link set multicast ..." command corresponds to the the IFF_MULTICAST flag hence to the #:multicast-on parameter. > Anyhow, I suggest adding a ‘multicast?’ field to , with > #t as its default value, and honoring this. I'm not sure is the right place for this flag. If there are two records in the same list, one for ipv4 and one for ipv6 it means that we need to repeat this flag twice. Same for the MTU, having different MTU for ipv4 and ipv6 addresses doesn't have any meaning. The MTU and multicast properties belong to the device itself. I think we should introduce a record that would gather the properties that can be passed to the "link-set" method of Guile-Netlink. The record would point to a unique . We would remove the device field from . Then each service would provision (concat 'networking- (network-device-name device)) or something like that, to fix https://issues.guix.gnu.org/52511 as well. How does that sounds? Thanks, Mathieu