Здравствуйте.

NAS Cisco 2821
Cisco IOS Software, 2800 Software (C2800NM-ADVIPSERVICESK9-M), Version 12.4(21), RELEASE SOFTWARE (fc1)
AAA через RADIUS.

Подключение под Windows проходит нормально, а вот под Linux (Gentoo 2.6.28) туннель устанавливается (падает через несколько минут), но данные внутри него не ходят, в дебаге:

Aug 19 07:13:45.974: Vi3 IPCP: Timeout: State ACKsent
Aug 19 07:13:45.974: Vi3 IPCP: O CONFREQ [ACKsent] id 2 len 10
Aug 19 07:13:45.974: Vi3 IPCP:    Address 92.242.xxx.yyy (0x03065CF27D01)
Aug 19 07:13:47.990: Vi3 IPCP: Timeout: State ACKsent
Aug 19 07:13:47.990: Vi3 IPCP: O CONFREQ [ACKsent] id 3 len 10
Aug 19 07:13:47.990: Vi3 IPCP:    Address 92.242.xxx.yyy (0x03065CF27D01)
Aug 19 07:13:50.006: Vi3 IPCP: Timeout: State ACKsent
Aug 19 07:13:50.006: Vi3 IPCP: O CONFREQ [ACKsent] id 4 len 10
Aug 19 07:13:50.006: Vi3 IPCP:    Address 92.242.xxx.yyy (0x03065CF27D01)
Aug 19 07:13:52.022: Vi3 IPCP: Timeout: State ACKsent
Aug 19 07:13:52.022: Vi3 IPCP: O CONFREQ [ACKsent] id 5 len 10
Aug 19 07:13:52.022: Vi3 IPCP:    Address 92.242.xxx.yyy (0x03065CF27D01)
Aug 19 07:13:54.038: Vi3 IPCP: Timeout: State ACKsent
Aug 19 07:13:54.038: Vi3 IPCP: O CONFREQ [ACKsent] id 6 len 10
Aug 19 07:13:54.038: Vi3 IPCP:    Address 92.242.xxx.yyy (0x03065CF27D01)
Aug 19 07:13:55.222: Vi3 LCP: O ECHOREQ [Open] id 2 len 12 magic 0x5218951B
Aug 19 07:13:56.054: Vi3 IPCP: Timeout: State ACKsent
Aug 19 07:13:56.054: Vi3 IPCP: O CONFREQ [ACKsent] id 7 len 10
Aug 19 07:13:56.054: Vi3 IPCP:    Address 92.242.xxx.yyy (0x03065CF27D01)
Aug 19 07:13:58.070: Vi3 IPCP: Timeout: State ACKsent
Aug 19 07:13:58.070: Vi3 IPCP: O CONFREQ [ACKsent] id 8 len 10
Aug 19 07:13:58.070: Vi3 IPCP:    Address 92.242.xxx.yyy (0x03065CF27D01)
Aug 19 07:14:00.086: Vi3 IPCP: Timeout: State ACKsent
Aug 19 07:14:00.086: Vi3 IPCP: O CONFREQ [ACKsent] id 9 len 10
Aug 19 07:14:00.086: Vi3 IPCP:    Address 92.242.xxx.yyy (0x03065CF27D01)
Aug 19 07:14:02.102: Vi3 IPCP: Timeout: State ACKsent
Aug 19 07:14:02.102: Vi3 IPCP: O CONFREQ [ACKsent] id 10 len 10
Aug 19 07:14:02.102: Vi3 IPCP:    Address 92.242.xxx.yyy (0x03065CF27D01)
Aug 19 07:14:04.118: Vi3 IPCP: Timeout: State ACKsent
Aug 19 07:14:04.118: Vi3 IPCP: State is ACKsent
Aug 19 07:14:05.462: Vi3 LCP: O ECHOREQ [Open] id 3 len 12 magic 0x5218951B
Aug 19 07:14:05.462: Vi3 LCP: echo_cnt 2, sent id 3, line up
Aug 19 07:14:15.703: Vi3 LCP: O ECHOREQ [Open] id 4 len 12 magic 0x5218951B
Aug 19 07:14:15.703: Vi3 LCP: echo_cnt 3, sent id 4, line up
Aug 19 07:14:25.943: Vi3 LCP: O ECHOREQ [Open] id 5 len 12 magic 0x5218951B
Aug 19 07:14:25.943: Vi3 LCP: echo_cnt 4, sent id 5, line up
Aug 19 07:14:34.135: Vi3 IPCP: Timeout: State ACKsent
Aug 19 07:14:34.135: Vi3 IPCP: O CONFREQ [ACKsent] id 11 len 10
Aug 19 07:14:34.135: Vi3 IPCP:    Address 92.242.xxx.yyy (0x03065CF27D01)
Aug 19 07:14:36.151: Vi3 IPCP: Timeout: State ACKsent
Aug 19 07:14:36.151: Vi3 IPCP: O CONFREQ [ACKsent] id 12 len 10
Aug 19 07:14:36.151: Vi3 IPCP:    Address 92.242.xxx.yyy (0x03065CF27D01)
Aug 19 07:14:36.183: Vi3 LCP: O ECHOREQ [Open] id 6 len 12 magic 0x5218951B
Aug 19 07:14:36.183: Vi3 LCP: echo_cnt 5, sent id 6, line up
Aug 19 07:14:38.167: Vi3 IPCP: Timeout: State ACKsent
Aug 19 07:14:38.167: Vi3 IPCP: O CONFREQ [ACKsent] id 13 len 10
Aug 19 07:14:38.167: Vi3 IPCP:    Address 92.242.xxx.yyy (0x03065CF27D01)

Настройки:

vpdn enable
!
vpdn-group 1
! Default PPTP VPDN group
accept-dialin
  protocol pptp
  virtual-template 1
!
interface Virtual-Template1
ip unnumbered GigabitEthernet0/0.1
no ip proxy-arp
peer default ip address dhcp-pool PPTP
ppp encrypt mppe auto
ppp authentication chap ms-chap ms-chap-v2

--------------------------------------------------

/etc/ppp/options

debug
#nodetach
user user001
lock
noauth
refuse-eap
refuse-chap
refuse-mschap
nobsdcomp
nodeflate
mppe required,stateless
lcp-echo-interval 15
lcp-echo-failure 3
defaultroute
usepeerdns
persist