When using DFS channels, it would be nice, if I could dedicate a small amount of interfaces only to CAC checking channels and set them available or unavailable on multiple other remote APs/Mesh Points in order to use them, when switching to lower utilized channels without going through a full CAC. Whats the opinion on the mailing list about adding a new command to nl80211 in order to set the DFS state of a currently not used channel after a Off-Channel CAC on another device nearby, but not on the same host? The parameters would roughly be the same as for a channel switch and an additional DFS channel state. Internally, I would trigger the DFS state sync code between multiple interfaces. Please note, that a malicious user, can misuse this and circumvent the initial CAC, but this possibility is always there by patching the kernel and all distribution kernels I'm aware off, are compiled without DFS support configured. Therefore a malicious user has already put in some energy and knows what he has to do. In my opinion this is therefore negligible. Regards, Markus
