pppd обрывает связь

Вот лог:

Mar 18 21:22:08 serv386 pppd[28843]: Using interface ppp0
Mar 18 21:22:08 serv386 pppd[28843]: Connect: ppp0 <--> /dev/ttyS1
Mar 18 21:22:08 serv386 pppd[28843]: sent [LCP ConfReq id=0x1 <magic 0x8fa514db> <pcomp> <accomp>]
Mar 18 21:22:08 serv386 pppd[28843]: rcvd [LCP ConfReq id=0x52 <asyncmap 0xa0000> <auth chap 05> <ma
Mar 18 21:22:08 serv386 pppd[28843]: sent [LCP ConfRej id=0x52 <auth chap 05>]
Mar 18 21:22:08 serv386 pppd[28843]: rcvd [LCP ConfAck id=0x1 <magic 0x8fa514db> <pcomp> <accomp>]
Mar 18 21:22:08 serv386 pppd[28843]: rcvd [LCP ConfReq id=0x53 <asyncmap 0xa0000> <auth chap 05> <ma
Mar 18 21:22:08 serv386 pppd[28843]: sent [LCP ConfRej id=0x53 <auth chap 05>]
Mar 18 21:22:08 serv386 pppd[28843]: rcvd [LCP ConfReq id=0x54 <asyncmap 0xa0000> <auth chap 05> <ma
Mar 18 21:22:08 serv386 pppd[28843]: sent [LCP ConfRej id=0x54 <auth chap 05>]
Mar 18 21:22:08 serv386 pppd[28843]: rcvd [LCP ConfReq id=0x55 <asyncmap 0xa0000> <auth chap 05> <ma
Mar 18 21:22:08 serv386 pppd[28843]: sent [LCP ConfRej id=0x55 <auth chap 05>]
Mar 18 21:22:08 serv386 pppd[28843]: rcvd [LCP ConfReq id=0x56 <asyncmap 0xa0000> <auth chap 05> <ma
Mar 18 21:22:08 serv386 pppd[28843]: sent [LCP ConfRej id=0x56 <auth chap 05>]
Mar 18 21:22:09 serv386 pppd[28843]: rcvd [LCP ConfReq id=0x57 <asyncmap 0xa0000> <auth chap 05> <ma
Mar 18 21:22:09 serv386 pppd[28843]: sent [LCP ConfRej id=0x57 <auth chap 05>]
Mar 18 21:22:09 serv386 pppd[28843]: rcvd [LCP ConfReq id=0x58 <asyncmap 0xa0000> <auth chap 05> <ma
Mar 18 21:22:09 serv386 pppd[28843]: sent [LCP ConfRej id=0x58 <auth chap 05>]
Mar 18 21:22:09 serv386 pppd[28843]: rcvd [LCP ConfReq id=0x59 <asyncmap 0xa0000> <auth chap 05> <ma
Mar 18 21:22:09 serv386 pppd[28843]: sent [LCP ConfRej id=0x59 <auth chap 05>]
Mar 18 21:22:09 serv386 pppd[28843]: rcvd [LCP ConfReq id=0x5a <asyncmap 0xa0000> <auth chap 05> <ma
Mar 18 21:22:09 serv386 pppd[28843]: sent [LCP ConfRej id=0x5a <auth chap 05>]
Mar 18 21:22:10 serv386 pppd[28843]: rcvd [LCP ConfReq id=0x5b <asyncmap 0xa0000> <auth chap 05> <ma
Mar 18 21:22:10 serv386 pppd[28843]: sent [LCP ConfRej id=0x5b <auth chap 05>]
Mar 18 21:22:10 serv386 pppd[28843]: rcvd [LCP ConfReq id=0x5c <asyncmap 0xa0000> <auth chap 05> <ma
Mar 18 21:22:10 serv386 pppd[28843]: sent [LCP ConfRej id=0x5c <auth chap 05>]
Mar 18 21:22:10 serv386 pppd[28843]: rcvd [LCP TermReq id=0x5d]
Mar 18 21:22:10 serv386 pppd[28843]: sent [LCP TermAck id=0x5d]
Mar 18 21:22:11 serv386 pppd[28843]: sent [LCP ConfReq id=0x1 <magic 0x8fa514db> <pcomp> <accomp>]
Mar 18 21:22:11 serv386 pppd[28843]: Modem hangup
Mar 18 21:22:11 serv386 pppd[28843]: Connection terminated.
Mar 18 21:22:12 serv386 pppd[28843]: Exit.
В чем проблема?