[_Dest_]

Вроде все сделал как ты сказал:

[root@localhost]# pptp-command start vpn
All routes added.
Tunnel vpn is active on ppp0. IP Address: 172.16.0.12
Installed /etc/resolv.conf.pptp as /etc/resolv.conf

[root@localhost]]# ip addr show

1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 brd 127.255.255.255 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever

2: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:02:a5:14:e2:da brd ff:ff:ff:ff:ff:ff
inet 10.0.0.12/22 brd 10.0.3.255 scope global eth0
inet6 fe80::202:a5ff:fe14:e2da/64 scope link
valid_lft forever preferred_lft forever

3: sit0: <NOARP> mtu 1480 qdisc noop
link/sit 0.0.0.0 brd 0.0.0.0

4: ppp0: <POINTOPOINT,MULTICAST,NOARP,UP> mtu 1500 qdisc pfifo_fast qlen 3
link/ppp
inet 172.16.0.12 peer 172.16.0.1/32 scope global ppp0

[root@localhost]# ping 172.16.0.1
PING 172.16.0.1 (172.16.0.1) 56(84) bytes of data.
64 bytes from 172.16.0.1: icmp_seq=1 ttl=64 time=7.74 ms
64 bytes from 172.16.0.1: icmp_seq=2 ttl=64 time=0.523 ms

[root@localhost]# ping 172.16.0.32
PING 172.16.0.32 (172.16.0.32) 56(84) bytes of data.
From 10.0.255.2 icmp_seq=1 Time to live exceeded
From 10.0.255.2 icmp_seq=2 Time to live exceeded

[root@localhost]]# ip route show
172.16.0.1 dev ppp0 proto kernel scope link src 172.16.0.12
10.0.0.0/22 dev eth0 proto kernel scope link src 10.0.0.12
default via 10.0.0.1 dev eth0

Ну а далше все тоже самое (плохо)
Может я в pptp-command setup что-то неправильно сделал