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проблемы с pppd



Добрый день!
Был у меня сервер на статическом белом ip адресе - провайдеру это не понравилось и переделали они на pppoe со статическим белым адресом :)
клиент сидит на "сером" ip провайдера через nat.
Вот после конфигуряния pppoe соединения и начались проблемы с pptp сервером - при присоединении клиента логи pptp сервера + логи iptables по пакетам такие:
Aug 12 13:05:23 s-vpn pptpd[4229]: CTRL: Client <client ip> control connection started
Aug 12 13:05:23 s-vpn pptpd[4229]: CTRL: Starting call (launching pppd, opening GRE)
Aug 12 13:05:23 s-vpn pppd[4231]: Plugin /usr/lib/pptpd/pptpd-logwtmp.so loaded.
Aug 12 13:05:23 s-vpn pppd[4231]: pppd 2.4.4 started by root, uid 0
Aug 12 13:05:23 s-vpn pppd[4231]: Using interface ppp1
Aug 12 13:05:23 s-vpn pppd[4231]: Connect: ppp1 <--> /dev/pts/4
Aug 12 13:05:23 s-vpn pptpd[4229]: GRE: Bad checksum from pppd.
Aug 12 13:05:23 s-vpn kernel: GRE!! IN= OUT=ppp0 SRC="" ip> DST=<client ip> LEN=65 TOS=0x00 PREC=0x00 TTL=64 ID=58095 DF PROTO=47
Aug 12 13:05:23 s-vpn kernel: GRE!! IN=ppp0 OUT= MAC= SRC="" ip> DST=<server ip> LEN=57 TOS=0x00 PREC=0x00 TTL=118 ID=17796 PROTO=47
Aug 12 13:05:23 s-vpn kernel: GRE!! IN= OUT=ppp0 SRC="" ip> DST=<client ip> LEN=47 TOS=0x00 PREC=0x00 TTL=64 ID=58096 DF PROTO=47
Aug 12 13:05:25 s-vpn kernel: GRE!! IN=ppp0 OUT= MAC= SRC="" ip> DST=<server ip> LEN=57 TOS=0x00 PREC=0x00 TTL=118 ID=17799 PROTO=47
Aug 12 13:05:25 s-vpn kernel: GRE!! IN= OUT=ppp0 SRC="" ip> DST=<client ip> LEN=47 TOS=0x00 PREC=0x00 TTL=64 ID=58097 DF PROTO=47
Aug 12 13:05:26 s-vpn kernel: GRE!! IN= OUT=ppp0 SRC="" ip> DST=<client ip> LEN=65 TOS=0x00 PREC=0x00 TTL=64 ID=58098 DF PROTO=47
Aug 12 13:05:28 s-vpn kernel: GRE!! IN=ppp0 OUT= MAC= SRC="" ip> DST=<server ip> LEN=57 TOS=0x00 PREC=0x00 TTL=118 ID=17802 PROTO=47
Aug 12 13:05:28 s-vpn kernel: GRE!! IN= OUT=ppp0 SRC="" ip> DST=<client ip> LEN=47 TOS=0x00 PREC=0x00 TTL=64 ID=58099 DF PROTO=47
Aug 12 13:05:29 s-vpn kernel: GRE!! IN= OUT=ppp0 SRC="" ip> DST=<client ip> LEN=65 TOS=0x00 PREC=0x00 TTL=64 ID=58100 DF PROTO=47
Aug 12 13:05:32 s-vpn kernel: GRE!! IN= OUT=ppp0 SRC="" ip> DST=<client ip> LEN=65 TOS=0x00 PREC=0x00 TTL=64 ID=58101 DF PROTO=47
Aug 12 13:05:32 s-vpn kernel: GRE!! IN=ppp0 OUT= MAC= SRC="" ip> DST=<server ip> LEN=57 TOS=0x00 PREC=0x00 TTL=118 ID=17805 PROTO=47
Aug 12 13:05:32 s-vpn kernel: GRE!! IN= OUT=ppp0 SRC="" ip> DST=<client ip> LEN=47 TOS=0x00 PREC=0x00 TTL=64 ID=58102 DF PROTO=47
Aug 12 13:05:35 s-vpn kernel: GRE!! IN= OUT=ppp0 SRC="" ip> DST=<client ip> LEN=65 TOS=0x00 PREC=0x00 TTL=64 ID=58103 DF PROTO=47
Aug 12 13:05:36 s-vpn kernel: GRE!! IN=ppp0 OUT= MAC= SRC="" ip> DST=<server ip> LEN=57 TOS=0x00 PREC=0x00 TTL=118 ID=17810 PROTO=47
Aug 12 13:05:36 s-vpn kernel: GRE!! IN= OUT=ppp0 SRC="" ip> DST=<client ip> LEN=47 TOS=0x00 PREC=0x00 TTL=64 ID=58104 DF PROTO=47
Aug 12 13:05:38 s-vpn kernel: GRE!! IN= OUT=ppp0 SRC="" ip> DST=<client ip> LEN=65 TOS=0x00 PREC=0x00 TTL=64 ID=58105 DF PROTO=47
Aug 12 13:05:40 s-vpn kernel: GRE!! IN=ppp0 OUT= MAC= SRC="" ip> DST=<server ip> LEN=57 TOS=0x00 PREC=0x00 TTL=118 ID=17813 PROTO=47
Aug 12 13:05:40 s-vpn kernel: GRE!! IN= OUT=ppp0 SRC="" ip> DST=<client ip> LEN=47 TOS=0x00 PREC=0x00 TTL=64 ID=58106 DF PROTO=47
Aug 12 13:05:41 s-vpn kernel: GRE!! IN= OUT=ppp0 SRC="" ip> DST=<client ip> LEN=65 TOS=0x00 PREC=0x00 TTL=64 ID=58107 DF PROTO=47
Aug 12 13:05:44 s-vpn kernel: GRE!! IN= OUT=ppp0 SRC="" ip> DST=<client ip> LEN=65 TOS=0x00 PREC=0x00 TTL=64 ID=58108 DF PROTO=47
Aug 12 13:05:44 s-vpn kernel: GRE!! IN=ppp0 OUT= MAC= SRC="" ip> DST=<server ip> LEN=57 TOS=0x00 PREC=0x00 TTL=118 ID=17817 PROTO=47
Aug 12 13:05:44 s-vpn kernel: GRE!! IN= OUT=ppp0 SRC="" ip> DST=<client ip> LEN=47 TOS=0x00 PREC=0x00 TTL=64 ID=58109 DF PROTO=47
Aug 12 13:05:47 s-vpn kernel: GRE!! IN= OUT=ppp0 SRC="" ip> DST=<client ip> LEN=65 TOS=0x00 PREC=0x00 TTL=64 ID=58110 DF PROTO=47
Aug 12 13:05:48 s-vpn kernel: GRE!! IN=ppp0 OUT= MAC= SRC="" ip> DST=<server ip> LEN=57 TOS=0x00 PREC=0x00 TTL=118 ID=17820 PROTO=47
Aug 12 13:05:48 s-vpn kernel: GRE!! IN= OUT=ppp0 SRC="" ip> DST=<client ip> LEN=47 TOS=0x00 PREC=0x00 TTL=64 ID=58111 DF PROTO=47
Aug 12 13:05:50 s-vpn kernel: GRE!! IN= OUT=ppp0 SRC="" ip> DST=<client ip> LEN=65 TOS=0x00 PREC=0x00 TTL=64 ID=58112 DF PROTO=47
Aug 12 13:05:52 s-vpn kernel: GRE!! IN=ppp0 OUT= MAC= SRC="" ip> DST=<server ip> LEN=57 TOS=0x00 PREC=0x00 TTL=118 ID=17823 PROTO=47
Aug 12 13:05:52 s-vpn kernel: GRE!! IN= OUT=ppp0 SRC="" ip> DST=<client ip> LEN=47 TOS=0x00 PREC=0x00 TTL=64 ID=58113 DF PROTO=47
Aug 12 13:05:53 s-vpn pppd[4231]: LCP: timeout sending Config-Requests
Aug 12 13:05:56 s-vpn kernel: GRE!! IN=ppp0 OUT= MAC= SRC="" ip> DST=<server ip> LEN=57 TOS=0x00 PREC=0x00 TTL=118 ID=17826 PROTO=47
Aug 12 13:05:56 s-vpn kernel: GRE!! IN= OUT=ppp0 SRC="" ip> DST=<client ip> LEN=69 TOS=0x00 PREC=0x00 TTL=64 ID=58114 DF PROTO=47
Aug 12 13:05:56 s-vpn kernel: GRE!! IN= OUT=ppp0 SRC="" ip> DST=<client ip> LEN=43 TOS=0x00 PREC=0x00 TTL=64 ID=58115 DF PROTO=47
Aug 12 13:05:59 s-vpn kernel: GRE!! IN= OUT=ppp0 SRC="" ip> DST=<client ip> LEN=65 TOS=0x00 PREC=0x00 TTL=64 ID=58116 DF PROTO=47
Aug 12 13:06:00 s-vpn pptpd[4229]: CTRL: Reaping child PPP[4231]
Aug 12 13:06:00 s-vpn pppd[4231]: Modem hangup
Aug 12 13:06:00 s-vpn pppd[4231]: Connection terminated.
Aug 12 13:06:00 s-vpn pppd[4231]: Exit.
Aug 12 13:06:00 s-vpn pptpd[4229]: CTRL: Client <client ip> control connection finished
итого - связь вроде есть и gre пакеты вроде ходят,  но при этом соединяться не хочет.
Все настройки, кроме дополнительных для pppoe не менялись, т.е. остались такими же.
Могу прислать настройки pptp и ppp, если это потребуется....
Что такое может могло сломаться?
Спасибо


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