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I know this may not be strictly on-topic here because it deals with "host-stuff" rather than "router-stuff", but here goes... I will have some comments on how to track where SYN storms are coming from a bit later. In order to build a SYN-resistant BSD kernel, you need to modify one file in src/sys/os, uipc_socket2.c, and you also need to modify src/sys/netinet/tcp_timer.h and you have to rebuild tcp_usrreq.c and tcp_input.c in the netinet directory. For those without SunOS source, I will get Sun4c (Sparc 1/1+/2/IPC/IPX/ ELC/SLC) binaries online; for those running BSD on other platforms, you probably have source.