如何在Linux 2.6上启用模块ip_gre的debugging日志logging?
看起来好像在ip_gre.c中没有生成输出,除了
printk(KERN_INFO "GRE over IPv4 tunneling driver\n"); printk(KERN_INFO "ipgre init: can't add protocol\n");
和
printk(KERN_INFO "ipgre close: can't remove protocol\n");
所以恐怕你不幸运了