From Fedora Project Wiki

Kernel

  • NM does't get notified about router advertisements and flag changes → we ask kernel upon any recieved route
  • NM doesn't get notified about gateways when accept_ra_defrtr=0
  • Kernel doesn't cache RDNSS and DNSSL, so we have to send router solicitation on NetworkManager start
  • NM can't trigger kernel router solicitation
  • Manually sent router solicitations give EADDRNOTAVAIL (link-local is there according to netlink)
  • Kernel doesn't treat dhcpv6 replies as ESTABLISHED, this is worked around by firewalld
  • Kernel autoconfigures link-local (and possibly also global) IPv6 addresses for bridge/bond members (I haven't tested this)

dnssec-trigger

  • NetworkManager doesn't work well with dnssec-trigger as unbound DNS server will not recieve the list of recursive nameservers and will thusresolve using the global DNS systems. This is incompatible with VPNs with their own private DNS zones.
  • dnssec-triggerd leaves broken /etc/resolv.conf on exit

firewalld

NetworkManager supports firewall zones for firewalld.

Openswan, strongSwan