Похоже на PPTP. Запрос приходит, сервер отвечает и потом опять все заново.
19:36:19.905567 IP 85-76-7-17-nat.elisa-mobile.fi.62970 > be.vpnki.ru.1723: Flags , win 32120, options [mss 1400], length 0
19:36:19.905779 IP be.vpnki.ru.1723 > 85-76-7-17-nat.elisa-mobile.fi.62970: Flags [R.], seq 0, ack 2976110577, win 0, length 0
19:36:22.482751 IP 85-76-7-17-nat.elisa-mobile.fi.21295 > be.vpnki.ru.1723: Flags , seq 2976110576, win 32120, options [mss 1400], length 0
19:36:22.483020 IP be.vpnki.ru.1723 > 85-76-7-17-nat.elisa-mobile.fi.21295: Flags [R.], seq 0, ack 2976110577, win 0, length 0
19:36:31.077397 IP 85-76-7-17-nat.elisa-mobile.fi.29164 > be.vpnki.ru.1723: Flags , seq 2976110576, win 32120, options [mss 1400], length 0
19:36:31.077844 IP be.vpnki.ru.1723 > 85-76-7-17-nat.elisa-mobile.fi.29164: Flags [R.], seq 0, ack 2976110577, win 0, length 0
19:36:39.044271 IP 85-76-7-17-nat.elisa-mobile.fi.18997 > be.vpnki.ru.1723: Flags , seq 3577109449, win 32120, options [mss 1400], length 0
19:36:39.044581 IP be.vpnki.ru.1723 > 85-76-7-17-nat.elisa-mobile.fi.18997: Flags [R.], seq 0, ack 3577109450, win 0, length 0
19:36:41.622460 IP 85-76-7-17-nat.elisa-mobile.fi.6253 > be.vpnki.ru.1723: Flags , seq 3577109449, win 32120, options [mss 1400], length 0
19:36:41.622689 IP be.vpnki.ru.1723 > 85-76-7-17-nat.elisa-mobile.fi.6253: Flags [R.], seq 0, ack 3577109450, win 0, length 0
19:36:50.217307 IP 85-76-7-17-nat.elisa-mobile.fi.4277 > be.vpnki.ru.1723: Flags , seq 3577109449, win 32120, options [mss 1400], length 0
19:36:50.217553 IP be.vpnki.ru.1723 > 85-76-7-17-nat.elisa-mobile.fi.4277: Flags [R.], seq 0, ack 3577109450, win 0, length 0