Hi, ledeguang> when I install MIPL Mobile IPv6: mipv6-0.9-v2.4.7.tar.gz, why I need to create the divice file for MIPL with "mknod /dev/mipv6_dev c 0xf9 0"? What does it mean? ledeguang> Thank everybody for help. mipdiag uses this device to communicate with mobile IPv6 module. If you have MIPL specific question, could you check http://www.mipl.mediapoli.com/? -- NT