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It is very convenient to detect SYN attacks. When you see a large number of semi-connection states on the server, especially the source IP address is random, you can basically conclude that this is a SYN attack. We use the netstat tool that comes with the system to detect SYN attacks:The attack uses the method of sending a large number of domain name resolution requests to the attacked server, Usually the domain name requested to be resolved is randomly generated or does not exist on the network. When the attacked DNS server receives the domain name resolution request, it will first look for whether there is a corresponding cache on the server. If it cannot be found and the domain name cannot be directly resolved by the server, the DNS server will recursively query the domain name information from its upper DNS server. The process of domain name resolution brings a great load to the server. If the number of domain name resolution requests exceeds a certain number per second, the DNS server will time out to resolve domain names.1. The proportion method is to determine a certain proportion of households with the lowest per capita income as poor households according to the survey data of urban residents' household income, calculate the per capita living expenses of poor households, multiply the maintenance coefficient of each employed person, and add an adjustment.产生的影响将会是非常巨大的，甚至直接关心到越国将来的国策。沙加路尴尬道：这要您来判断了，总督，我只是一个商人。= = = Looking at society from the perspective of education, looking at education from the perspective of society = = =