Dell PowerConnect 8100 CLI Reference Guide - Page 1040
FF:FF:FF:FF:FF:FF., configuration for the destination UDP port. If so, the relay agent unicasts
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Protocol DNS NetBIOS Name Server NetBIOS Datagram Server TACACS Server Time Service DHCP Trivial File Transfer Protocol UDP Port Number 53 137 138 49 37 67 69 Certain preexisting configurable DHCP relay options do not apply to relay of other protocols. These options are unchanged. The user may optionally set a DHCP maximum hop count or minimum wait time. The relay agent relays DHCP packets in both directions. It relays broadcast packets from the client to one or more DHCP servers, and relays packets to the client that the DHCP server unicasts back to the relay agent. For other protocols, the relay agent only relays broadcast packets from the client to the server. Packets from the server back to the client are assumed to be unicast directly to the client. Because there is no relay in the return direction for protocols other than DHCP, the relay agent retains the source IP address from the original client packet. The relay agent uses a local IP address as the source IP address of relayed DHCP client packets. When a switch receives a broadcast UDP packet on a routing interface, the relay agent verifies that the interface is configured to relay to the destination UDP port. If so, the relay agent unicasts the packet to the configured server IP addresses. Otherwise, the relay agent verifies that there is a global configuration for the destination UDP port. If so, the relay agent unicasts the packet to the configured server IP addresses. Otherwise the packet is not relayed. The relay agent only relays packets that meet the following conditions: • The destination MAC address must be the all-ones broadcast address (FF:FF:FF:FF:FF:FF). • The destination IP address must be the limited broadcast address (255.255.255.255) or a directed broadcast address for the receive interface. • The IP time-to-live (TTL) must be greater than 1. 1040 IP Helper/DHCP Relay Commands
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