SYN数据包偶尔会在Linux上丢失

We're running a Debian with a 2.6.16 kernel, with iptables enabled. The system is running a custom made HTTP proxy, which is subjected to a mild load (it works fine with the same load on other sites). The system comprises of 4 servers that are preceded by a load balancer with virtual IP, which is preceded by an array of 4 ISA 2004 machines, so the basic topology is:We're running a Debian with a 2.6.16 kernel, wi