Power over ethernet management devices and connection between ethernet devices
In one embodiment, a connection is maintained between a pair of ethernet ports that have circuitry connected in series with the ports and receiving power-over-ethernet (PoE) from one of the ports, by providing a controllable bypass circuit coupled to the pair of ethernet ports in parallel with the circuitry receiving power-over-ethernet, sensing a preselected condition, and opening and closing the bypass circuit in response to the presence or absence of the preselected condition. Power sourcing equipment (PSE) may supply the one of the ports with power over ethernet, and the circuitry may transports data between the pair of ethernet ports. The circuitry may also supply the switch with a control signal in response to the detection of the preselected condition.
1. An ethernet network comprising:
a physical ethernet segment shared by at least two protected private networks coupled to a carrier network, comprising;
a first special client coupled to the interface between said ethernet segment and one of said protected private networks;
a second special client coupled to the interface between said ethernet segment and the other of said protected private networks; and
a network resolver between said ethernet segment and said carrier network;
each of said special clients and said resolver having a unique MAC address and being programmed to find the MAC address corresponding to an IP address, each of said special clients being programmed to send an ARP request to said network resolver using a unicast destination address, and said network resolver being programmed to respond to said request using a unicast ARP reply.
2. The ethernet network of claim 1 wherein said network resolver is programmed to block and intercept multicast and broadcast IP traffic on any of its ports.
3. The ethernet network of claim 2 wherein said network resolver includes an address resolution table of MAC addresses corresponding to IP addresses, and said special clients are programmed to send said network resolver a dummy ARP request upon power up or reset, to allow said network resolver to populate said address resolution table.
4. A method of resolving an MAC address from an IP address in an ethernet network, the ethernet network comprising a physical ethernet segment shared by at least two protected private networks coupled to a carrier network, the method comprising;
receiving by a network responder, the network responder located between the ethernet segment and the carrier network, a first ARP request transmitted by a first special client, the first ARP request using a first unicast destination address, the first special client coupled to an interface between the ethernet segment and one of the protected private networks;
receiving by the network responder, a second ARP request transmitted by a second special client, the second ARP request using a second unicast destination address, the second special client coupled to an interface between the ethernet segment and the other of the protected private networks;
resolving by the network responder, the unique MAC address of the first special client corresponding to the IP address of the first special client;
resolving by the network responder, the unique MAC address of the second special client corresponding to the IP address of the second special client;
transmitting by the network responder to the first special client a response to the first ARP request, using a third ARP request, the third ARP request using a third unicast destination address;
transmitting by the network responder to the second special client a response to the second ARP request, using a fourth ARP request, the fourth ARP request using a fourth unicast destination address.
5. The method of claim 4 further comprising blocking and intercepting, by the network resolver, multicast and broadcast IP traffic on any of its ports.
6. The method of claim 5 further comprising populating, by the network resolver, an address resolution table of MAC addresses corresponding to IP addresses, the address resolution table stored in the network resolver, the address resolution table receiving dummy ARP requests from either of the first special client or the second special client upon power up or reset of either of the first special client or the second special client.
7. The method of claim 5 further comprising blocking by the network resolver, a multicast or broadcast IP packet addressed to the first special client, the network resolver responding to the originator of the IP packet with the MAC address of the first special client.
8. The method of claim 4 further comprising initiating a timer, by the first special client, when transmitting the first ARP request, wherein if the third ARP request is not received by the first special client before the timer runs out, the first special client retransmitting the first ARP request to a second network resolver coupled to the ethernet segment.