Method, relay agent, and system for acquiring internet protocol address in network

A relay agent for acquiring an Internet Protocol (IP) address, the relay agent comprising:

• a memory storage comprising instructions;
• and
• one or more processors in communication with the memory, wherein the one or more processors execute the instructions to:
• replicate a Dynamic Host Configuration Protocol (DHCP) Discover packet of a client to obtain multiple DHCP Discover packets;
• add one gateway IP address of multiple gateway IP addresses to each DHCP Discover packet;
• after the processor executes the instructions to replicate the DHCP Discover packet to obtain the multiple DHCP Discover packets and add one gateway IP address of the multiple gateway IP addresses to each DHCP Discover packet, then send the multiple DHCP Discover packets carrying different gateway IP addresses to the DHCP server by using a network-side port;
• instruct the DHCP server to allocate an IP address to the client and send a DHCP Offer packet to the client after determining that one gateway IP address in the multiple gateway IP addresses belongs to a same network segment as the allocated IP address;
• and after a DHCP Request packet from the client is received, acquire an IP address of the client from the DHCP Request packet, select, from the multiple gateway IP addresses, one gateway IP address that belongs to the same network segment as the IP address of the client, add the selected gateway IP address to the DHCP Request packet, and send the DHCP Request packet to the DHCP server.

A relay agent comprising:

• a memory having first instructions stored thereon and one or more first processors in communication with the memory, wherein the one or more first processors are configured to execute the first instructions to:
• receive a Dynamic Host Configuration Protocol (DHCP) Discover packet from a client;
• replicate the DHCP Discover packet to obtain multiple DHCP Discover packets;
• add one gateway IP address of multiple gateway IP addresses to each of the multiple DHCP Discover packets, and after the one or more first processors execute the instructions to replicate the DHCP Discover packet to obtain the multiple DHCP Discover packets and add one gateway IP address of the multiple gateway IP addresses to each DHCP Discover packet, then send the multiple DHCP Discover packets carrying different gateway IP addresses to the DHCP server;
• and
• receive a DHCP Request packet from the client, acquire an IP address of the client from the DHCP Request packet, select, from the multiple gateway IP addresses, one gateway IP address that belongs to a same network segment as the IP address of the client, add the selected gateway IP address to the DHCP Request packet, and send the DHCP Request packet to the DHCP server, so that the DHCP server instructs the DHCP server to allocate the IP address to the client.