Потратил 4 часа! прочел всю ветку но решения не нашел...
проблема:
freebsd+mpd (client)(13.13.13.13)->Linux RH9+poptop(server) (12.12.12.12)

запускаю mpd, проходит аутентификация, поднимается интерфейс ng0

mpd.conf:
default:
        load vpn

vpn:
        new -i ng0 vpn vpn
        set iface disable on-demand
        set iface addrs 10.10.7.1 10.10.6.1
        set iface idle 0
        set iface route default
        set bundle disable multilink
        set bundle authname "user"
        set bundle password "pass"
        set link yes acfcomp protocomp
        set link disable chap pap
        set link accept chap pap
#       set link no pap
#       set link yes chap
# If remote machine is NT you need this..
        set link enable no-orig-auth
        set link keep-alive 10 75
        set ipcp yes vjcomp
        set ipcp ranges 0.0.0.0/0 0.0.0.0/0
#
# The five lines below enable Microsoft Point-to-Point encryption
# (MPPE) using the ng_mppc(8) netgraph node type.
#
        set bundle enable compression
        set ccp yes mppc
        set ccp yes mpp-e40
        set ccp yes mpp-e128
        set bundle enable crypt-reqd
        set ccp yes mpp-stateless
        open
-----------------------------------------------------------

в консоли mpd выводит:
.......................
[vpn] IFACE: Up event
[vpn] setting interface ng0 MTU to 1496 bytes
[vpn] exec: /sbin/ifconfig ng0 10.10.6.102 12.12.12.12 netmask 0xffffffff -link0
[vpn] exec: /sbin/route add 10.10.6.102 -iface lo0
[vpn] exec: /sbin/route add 0.0.0.0 12.12.12.12
[vpn] exec: command returned 256
[vpn] IFACE: Up event
[vpn] error writing len 12 frame to bypass: Resource deadlock avoided
[vpn] LCP: no reply to 1 echo request(s)
[vpn] error writing len 12 frame to bypass: Resource deadlock avoided
[vpn] LCP: no reply to 2 echo request(s)

при попытке pinga на дальний конец туннеля:

ping: sendto: Resource deadlock avoided
ping: sendto: Resource deadlock avoided
ping: sendto: Resource deadlock avoided
ping: sendto: No buffer space available
ping: sendto: No buffer space available
ping: sendto: No buffer space available
ping: sendto: No buffer space available
ping: sendto: No buffer space available

silur# tcpdump -n -i xl0 proto gre
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on xl0, link-type EN10MB (Ethernet), capture size 96 bytes
00:43:54.961784 IP 12.12.12.12 > 13.13.13.13: call 3739 seq 0 ack 4294967295 gre-ppp-payload
00:43:54.963635 IP 13.13.13.13 > 12.12.12.12 : call 28928 seq 0 ack 0 gre-ppp-payload
00:43:54.968519 IP 13.13.13.13 > 12.12.12.12 : call 28928 seq 1 gre-ppp-payload
00:43:54.976378 IP 12.12.12.12  > 13.13.13.13: call 3739 seq 1 ack 0 gre-ppp-payload
00:43:54.982301 IP 12.12.12.12  > 13.13.13.13: call 3739 seq 2 ack 1 gre-ppp-payload
00:43:54.985634 IP 13.13.13.13> 12.12.12.12 : call 28928 seq 2 ack 2 gre-ppp-payload
00:43:55.001771 IP 12.12.12.12  > 13.13.13.13: call 3739 seq 3 ack 2 gre-ppp-payload

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уже все глаза просмотрел...
может встречался кто-то с подобной проблемой?
подскажите...