Hi, >Why did you think that? Since I got a strange package with protocol field 0xFD(not 0x00FD). I've read ppp_generic.txt and got that the upper layer should pass packages to ppp_generic driver with two octets protocol field. So this should be finished on l2tp layer(channel preferably) or other kinds of channel. >l2tp is just an encapsulation layer which has nothing to do with MPPC. You are right. >Do you have a good reason for apparently ignoring my statement that MPPC >is usually not supported by the ppp modules in the kernel? Are you quite >sure that your kernel (or kernel modules) has been specifically patched to >support MPPC? If not, you cannot use MPPC, not matter how you configure >your client. Really? But in my machine(which kernel is 2.6, Debian system) has ppp_mppe module but no any patch. Also has other compress module such as bsd_comp, deflate. Does this mean that kernel support it and I can use it? Thanks so much for your kindly reply. Regards. -- c.j -- To unsubscribe from this list: send the line "unsubscribe linux-ppp" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html