Hi, Can nf_register_hook() and nf_unregister_hook ever fail ? , i.e shld I check for nf_register_hook() returning a value of less than 0 in my code. I looked at its definition in net/core/netfilter.c, it always returns 0, though in some places in kernel code, I find ppl checking for a <0(net/ipv4/netfilter/arptable_filter.c)return and at some places I dont (net/ipv4/netfilter/ip_fw_compat.c)?, is it really required ? thanks Amit ***************** HSS-Unclassified *************