CentOS dual-network interface policy routing test

1. Reference link: ---- you can configure according to the following link. in redhatlinux, you can go back to the NIC from which the target address is located: Swap (for interchange I. Reference link:
---- You can configure the following link. in redhat linux, you can go back to the network card from which the destination address is the network card address:
Http://bbs.chinaunix.net/thread-4871955-2-1.html#]

---- In actual tests, only one default gateway is configured, even if no configuration is made, Although icmp and tcp traffic enters from the management Port and returns from the business Port, there is no problem, can normally receive ICMP and TCP session establishment (it is not convenient to test the exchange UDP, not tested)