On 23/03/15 16:37, thufir wrote: > On Mon, 23 Mar 2015 10:11:54 +0000, Lukasz Sokol wrote: > >> No, ethernet switch works at lower / physical / MAC layer, NAT is >> 'above' >> that; >> so as long as everything is OK with your TCP/IP settings everywhere, >> a switch is entirely transparent to TCP/IP (or generally, when it's >> encapsulated into MAC traffic). > > > so how does a client pc find the server if there's no NAT? by IP > address?? That makes no sense, to me, if the switch isn't assigning > addresses. > > > -Thufir > > +1 to what Kevin said, and
there is a protocol running on pretty much every ethernet based network, named ARP : Address Resolution Protocol, by which ALL the clients learn ALL the surrounding clients (including the one that is the GATEWAY) MAC/IP combinations. Simplified, the encapsulation of ethernet packets is sort-of | MAC Header | IP Header | Packet |[MAC Source address][MAC Destination Address]|[Source IP][Destination IP]|[The rest of packet] [order and number of fields not necessarily real-life, for illustration purposes only] now the MAC source/dest fields are added AND REMOVED as needed when the packet passes from card to computer/router, then from computer/router to card; as the MAC fields don't make sense in wider area networks; 'dumb' switches don't participate/snoop in ARP, only store a table of what card MAC address they encountered on source MAC field of packets coming from that interconnect manageable switches /can/ participate and filter in the ARP process if told so and have such option. HTH, el es -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
