Вот что творится в логах перед падением протокола:

Nov 11 06:25:31 zurbagan /kernel: cp0: got lcp echo req, sending echo rep
Nov 11 06:25:31 zurbagan /kernel: cp0: lcp output <echo-reply id=0x45 len=12 69-5a-51-56-00-06-df-ba>
Nov 11 06:25:41 zurbagan /kernel: cp0: lcp input(opened): <echo-req id=0x46 len=12 f0-5f-28-ac-00-02-6d-29>
Nov 11 06:25:41 zurbagan /kernel: cp0: got lcp echo req, sending echo rep
Nov 11 06:25:41 zurbagan /kernel: cp0: lcp output <echo-reply id=0x46 len=12 69-5a-51-56-00-02-6d-29>
Nov 11 06:25:50 zurbagan /kernel: cp0.0: device timeout
^^^^^^^^^^^^^^^ Вот это меня смущает!

Nov 11 06:25:51 zurbagan /kernel: cp0: lcp input(opened): <echo-req id=0x47 len=12 f0-5f-28-ac-00-02-6d-2a>
Nov 11 06:25:51 zurbagan /kernel: cp0: got lcp echo req, sending echo rep
Nov 11 06:25:51 zurbagan /kernel: cp0: lcp output <echo-reply id=0x47 len=12 69-5a-51-56-00-02-6d-2a>
Nov 11 06:26:21 zurbagan /kernel: cp0: lcp input(opened): <echo-req id=0x48 len=12 f0-5f-28-ac-00-02-6d-2d>
Nov 11 06:26:21 zurbagan /kernel: cp0: got lcp echo req, sending echo rep
Nov 11 06:26:21 zurbagan /kernel: cp0: lcp output <echo-reply id=0x48 len=12 69-5a-51-56-00-02-6d-2d>
Nov 11 06:26:41 zurbagan /kernel: cp0: lcp input(opened): <echo-req id=0x49 len=12 f0-5f-28-ac-00-16-ab-0d>
Nov 11 06:26:41 zurbagan /kernel: cp0: got lcp echo req, sending echo rep
.........
.........
Nov 11 06:28:31 zurbagan /kernel: c