Смотрите логи, вероятно у вас включена компресия, которая не поддерживается на DI

default:
load pptp_client_cfk


pptp_client_cfk:
create bundle static B2
# set bundle enable compression
# set ccp yes mppc
# set mppc yes e40
# set mppc yes e128
# set bundle enable crypt-reqd
# set mppc yes stateless

create link static L2 pptp
# set link action bundle B2
# set link no pap
# set link yes chap
set auth authname ***
set auth password ***
set link max-redial 1
# set link mtu 1460
set link keep-alive 20 75
set pptp peer ******
# set pptp self 89.19.36.59
# set link yes chap
# set pptp disable windowing
# set link enable multilink
# set link yes acfcomp protocomp
# set link enable no-orig-auth
open

ct 17 15:13:32 bsd mpd: Multi-link PPP daemon for FreeBSD
Oct 17 15:13:32 bsd mpd:
Oct 17 15:13:32 bsd mpd: process 7907 started, version 5.1 (root@bds.local 16
Oct 17 15:13:32 bsd mpd: [B2] Bundle: Interface ng0 created
Oct 17 15:13:32 bsd mpd: [L2] Link: OPEN event
Oct 17 15:13:32 bsd mpd: [L2] LCP: Open event
Oct 17 15:13:32 bsd mpd: [L2] LCP: state change Initial --> Starting
Oct 17 15:13:32 bsd mpd: [L2] LCP: LayerStart
Oct 17 15:13:33 bsd mpd: [L2] PPTP call successful
Oct 17 15:13:33 bsd mpd: [L2] Link: UP event
Oct 17 15:13:33 bsd mpd: [L2] Link: origination is local
Oct 17 15:13:33 bsd mpd: [L2] LCP: Up event
Oct 17 15:13:33 bsd mpd: [L2] LCP: state change Starting --> Req-Sent
Oct 17 15:13:33 bsd mpd: [L2] LCP: SendConfigReq #1
Oct 17 15:13:33 bsd mpd: [L2] ACFCOMP
Oct 17 15:13:33 bsd mpd: [L2] PROTOCOMP
Oct 17 15:13:33 bsd mpd: [L2] ACCMAP 0x000a0000
Oct 17 15:13:33 bsd mpd: [L2] MRU 1500
Oct 17 15:13:33 bsd mpd: [L2] MAGICNUM 02f2d875
Oct 17 15:13:33 bsd mpd: [L2] LCP: rec'd Configure Request #1 (Req-Sent)
Oct 17 15:13:33 bsd mpd: [L2] MRU 1500
Oct 17 15:13:33 bsd mpd: [L2] AUTHPROTO CHAP MSOFT
Oct 17 15:13:33 bsd mpd: [L2] MAGICNUM 20231c00
Oct 17 15:13:33 bsd mpd: [L2] ACFCOMP
Oct 17 15:13:33 bsd mpd: [L2] LCP: SendConfigNak #1
Oct 17 15:13:33 bsd mpd: [L2] AUTHPROTO CHAP MSOFTv2
Oct 17 15:13:33 bsd mpd: [L2] LCP: rec'd Configure Reject #1 (Req-Sent)
Oct 17 15:13:33 bsd mpd: [L2] PROTOCOMP
Oct 17 15:13:33 bsd mpd: [L2] ACCMAP 0x000a0000
Oct 17 15:13:33 bsd mpd: [L2] LCP: SendConfigReq #2
Oct 17 15:13:33 bsd mpd: [L2] ACFCOMP
Oct 17 15:13:33 bsd mpd: [L2] MRU 1500
Oct 17 15:13:33 bsd mpd: [L2] MAGICNUM 02f2d875
Oct 17 15:13:35 bsd mpd: [L2] LCP: SendConfigReq #3
Oct 17 15:13:35 bsd mpd: [L2] ACFCOMP
Oct 17 15:13:35 bsd mpd: [L2] MRU 1500
Oct 17 15:13:35 bsd mpd: [L2] MAGICNUM 02f2d875
Oct 17 15:13:37 bsd mpd: [L2] LCP: SendConfigReq #4
Oct 17 15:13:47 bsd mpd: [L2] ACFCOMP
Oct 17 15:13:47 bsd mpd: [L2] MRU 1500
Oct 17 15:13:47 bsd mpd: [L2] MAGICNUM 02f2d875
Oct 17 15:13:49 bsd mpd: [L2] LCP: SendConfigReq #10
Oct 17 15:13:49 bsd mpd: [L2] ACFCOMP
Oct 17 15:13:49 bsd mpd: [L2] MRU 1500
Oct 17 15:13:49 bsd mpd: [L2] MAGICNUM 02f2d875
Oct 17 15:13:51 bsd mpd: [L2] LCP: SendConfigReq #11
Oct 17 15:13:51 bsd mpd: [L2] ACFCOMP
Oct 17 15:13:51 bsd mpd: [L2] MRU 1500
Oct 17 15:13:51 bsd mpd: [L2] MAGICNUM 02f2d875
Oct 17 15:13:53 bsd mpd: [L2] LCP: parameter negotiation failed
Oct 17 15:13:53 bsd mpd: [L2] LCP: state change Req-Sent --> Stopped
Oct 17 15:13:53 bsd mpd: [L2] LCP: LayerFinish
Oct 17 15:13:53 bsd mpd: [L2] PPTP call terminated
Oct 17 15:13:53 bsd mpd: [L2] Link: DOWN event
Oct 17 15:13:53 bsd mpd: [L2] LCP: Down event
Oct 17 15:13:53 bsd mpd: [L2] LCP: state change Stopped --> Starting
Oct 17 15:13:53 bsd mpd: [L2] LCP: LayerStart
Oct 17 15:13:53 bsd mpd: [L2] Link: reconnection attempt 1 in 2 seconds

О каком D-Link устрйостве идёт речь? Приведите настройки.