Keepalived + pptpd

Добрый день.
Настроен keepalived на двух хостах. На них же установлен pptpd.
При подключении к реальным ip-адресам хостов соединение проходит нормально и vpn-клиенты попадают в локальную сеть.
При подключении к виртуальному ip-адресу подключение не проходит. Лог событий:
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Aug 30 17:58:45 GW-REZERV1 pptpd[55248]: CTRL: Client х.х.х.х control connection started
Aug 30 17:58:45 GW-REZERV1 pptpd[55248]: CTRL: Starting call (launching pppd, opening GRE)
Aug 30 17:58:46 GW-REZERV1 pppd[55251]: Plugin winbind.so loaded.
Aug 30 17:58:46 GW-REZERV1 pppd[55251]: WINBIND plugin initialized.
Aug 30 17:58:46 GW-REZERV1 pppd[55251]: Plugin /usr/lib/pptpd/pptpd-logwtmp.so loaded.
Aug 30 17:58:46 GW-REZERV1 pppd[55251]: pppd 2.4.5 started by dail, uid 0
Aug 30 17:58:46 GW-REZERV1 pppd[55251]: Using interface ppp0
Aug 30 17:58:46 GW-REZERV1 Keepalived_vrrp[5397]: Netlink: filter function error
Aug 30 17:58:46 GW-REZERV1 pppd[55251]: Connect: ppp0 <--> /dev/pts/2
Aug 30 17:58:46 GW-REZERV1 Keepalived_healthcheckers[5395]: Netlink: filter function error
длинная пауза
Aug 30 17:59:16 GW-REZERV1 pppd[55251]: LCP: timeout sending Config-Requests
Aug 30 17:59:16 GW-REZERV1 pppd[55251]: Connection terminated.
Aug 30 17:59:16 GW-REZERV1 Keepalived_vrrp[5397]: Netlink: filter function error
Aug 30 17:59:16 GW-REZERV1 Keepalived_healthcheckers[5395]: Netlink: filter function error
Aug 30 17:59:16 GW-REZERV1 pppd[55251]: Modem hangup
Aug 30 17:59:16 GW-REZERV1 pppd[55251]: Exit.
Aug 30 17:59:16 GW-REZERV1 pptpd[55248]: GRE: read(fd=6,buffer=6075c0,len=8196) from PTY failed: status = -1 error = Input/output error, usually caused by unexpected termination of pppd, check option syntax and pppd logs
Aug 30 17:59:16 GW-REZERV1 pptpd[55248]: CTRL: PTY read or GRE write failed (pty,gre)=(6,7)
Aug 30 17:59:16 GW-REZERV1 pptpd[55248]: CTRL: Reaping child PPP[55251]
Aug 30 17:59:16 GW-REZERV1 pptpd[55248]: CTRL: Client x.x.x.x control connection finished

Настраивал ли кто-нибудь такие конфигурации? Не может ли быть конфликтов?
Могу привести отдельно конфиг keepalived и pptpd