Method for simultaneously implementing layer 2 switching, layer 3 routing, data content filtering, and firewall function in one same chip
A technology of data content and firewall, applied in the fields of network, network security and networking, it can solve the problems of numerous networking devices, achieve flexible networking, reduce bandwidth requirements, and save CPU resources.
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[0025] The present invention realizes multiple network functions with a single chip, and its overall technical scheme includes: performing network address translation (NAT) in the first step, performing layer-2 switching in the second step, and performing layer-3 routing in the third step. The specific steps it adopts are as follows:
[0026] 1. Write the VLAN entry information into the chip.
[0027] Write the entry information of the routing table into the chip. ;
[0028] 2. Analyze the received message to get SMAC, DMAC, EtherType, SIP, DIP, Protocol, SPORT, DPORT (source MAC address, destination MAC address, source IP address, destination IP address, protocol number) of the input message , Layer 4 source PORT, Layer 4 destination PORT and the header 80byte of the packet) and other fields.
[0029] 3. Use the analyzed SMAC and DMAC to find the L2 table.
[0030] 4. Use the analyzed SIP and DIP to find the L3 table.
[0031] 5. Use the analyzed SIP, DIP, Protocol, SPOR...
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