2018-08-16 3:40 GMT+08:00 Patrick Klos <[email protected]>: > On 8/15/2018 11:25 AM, Axel Lin wrote: > > Hi list, > > I'm testing a LTE module with lwIP and found always got bad fcs as below. > I dump the received data below: > Is there anything wrong in the received data? > > sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns2 > 0.0.0.0>]␍␊ > pppos_write[0]: len=26␍␊ > pppos_input[0]: got 17 bytes␍␊ > 7e ff 3 80 21 1 1 16 3 6 81 6 83 6 6e db 7e ␍␍␊ > pppos_input[0]: Dropping bad fcs 0x4114 proto=0x8021␍␊ > > > That doesn't look like a good PPP packet.
Hi Patrick and Sylvain, Thanks for your valuable comments. I re-check my code and found I disable LCP magic number negotiation due to hit issue without checking the root cause. So the first error should be "Serial line is looped back". I will check with module vendor. Thanks, Axel _______________________________________________ lwip-users mailing list [email protected] https://lists.nongnu.org/mailman/listinfo/lwip-users
