Le 08/01/2017 à 17:10, Reco a écrit :
Pascal Hambourg <pascal@plouf.fr.eu.org> wrote:Le 06/01/2017 à 13:15, Reco a écrit :DHCP is L4, IP is L3 and openvswitch cares about L2 mostly.Self-correction. DHCP is L7.Why ? DHCP deals with IP configuration, so I'd rather classify it as part of layer 3, with IP and ICMP. AFAIK, it does not provide any service to any application but to the IP layer itself, just like ICMP.[1] lists is as an application level protocol.
Wikipedia is not an authoritative source.However RFC1122 lists BOOTP, the predecessor of DHCP, among the support protocols of the application layer. So be it...
My original thought was UDP, hence L4.
Common mistake. A protocol layer is defined by the service it provides, not the protocol layer it is based upon. For example NDP is based on ICMPv6 (network layer), itself based on IPv6 (also network layer) but is in the link layer.
Furthermore, there are lots of dhcp options (ntp-server, local-proxy-config to name a few that are actually used) that deal with client's configuration that's not related to IP configuration directly.
Agreed.