Hi, for to apply the klips patch kernel I must modify kernel.spec, in previous I have applied nat-t patch and in kernel.spec ( I use kernel 2.6 on fedora core 3) I have inserted: CONFIIG_IPSEC_NAT_TRAVERSAL ..now for to apply klips patch what I must writed in kernel.spec ?? I am not succesfull to find an information about this, sorry. Salvatore.