Method and device for processing packet

A method for processing a packet by a load balancer, the method comprising:

• receiving a packet from a client;
• changing, through an extended berkeley packet filter (eBPF), the received packet by changing a cyclic redundancy check (CRC) and at least one of a source port or a destination port of the received packet;
• and
• transmitting the changed packet to a server,
• wherein the changed CRC is based on an operation performed on an intermediate CRC and the CRC of the received packet,
• wherein the intermediate CRC is based on the changed at least one of the source port or the destination port concatenated with a block of zeros, and
• wherein the number of zeros in the block of zeros is based on a length of a packet payload of the received packet.

An electronic device for processing a packet, the electronic device comprising:

• memory storing one or more computer programs;
• and
• one or more processors communicative coupled to the memory,
• wherein the one or more computer programs include computer-executable instructions that, when executed by the one or more processors, cause the electronic device to:
• identify a first packet including a first part, a second part, and a cyclic redundancy check (CRC) part;
• obtain a second value by modifying a first value of the first part of the first packet;
• obtain a third value by performing a first exclusive or (XOR) operation on the first value and the obtained second value;
• obtain a fourth value which is a CRC value for the obtained third value;
• obtain a fifth value which is a CRC value corresponding to concatenation of the third value and a number of zeros corresponding to a length of the second part of the first packet, based on the length of the second part of the first packet and the obtained fourth value;
• obtain a sixth value by performing a second XOR operation on a value of the CRC part of the first packet and the obtained fifth value;
• and
• generate a second packet including a first part having the second value, a second part which is the same as the second part of the first packet, and a CRC part having the sixth value.