Есть дефолтный конфиг с оф сайта:
[modules]
log_syslog
pptp
l2tp
pppoe
auth_mschap_v2
auth_mschap_v1
auth_chap_md5
auth_pap
ippool
chap-secrets
[core]
log-error=/var/log/accel-ppp/core.log
thread-count=4
[ppp]
verbose=1
min-mtu=1280
mtu=1400
mru=1400
ipv4=require
ipv6=deny
[lcp]
echo-interval=30
echo-failure=3
[pptp]
verbose=1
[pppoe]
interface=eth0
verbose=1
[l2tp]
verbose=1
[dns]
dns1=172.16.0.1
dns2=172.16.1.1
[client-ip-range]
192.168.0.0/24
[ip-pool]
gw-ip-address=192.168.2.1
192.168.2.2-255
[log]
log-emerg=/var/log/accel-ppp/emerg.log
#syslog=accel-pppd,daemon
copy=1
level=3
[chap-secrets]
gw-ip-address=192.168.0.1
#chap-secrets=/etc/ppp/chap-secrets
[cli]
telnet=127.0.0.1:2000
tcp=127.0.0.1:2001
#password=123