Ubuntu Manpage: pptpd.conf - PPTP VPN daemon configuration

NAME

       pptpd.conf - PPTP VPN daemon configuration

DESCRIPTION

       pptpd(8)  reads  options  from  this  file,  usually /etc/pptpd.conf.  Most options can be
       overridden by the command line.  The local and remote IP addresses for clients  must  come
       from the configuration file or from pppd(8) configuration files.

OPTIONS

option option-file
the name of an option file to be passed to pppd(8) in place of the default
/etc/ppp/options so that PPTP specific options can be given. Equivalent to the
command line --option option.

stimeout seconds
number of seconds to wait for a PPTP packet before forking the pptpctrl(8) program
to handle the client. The default is 10 seconds. This is a denial of service
protection feature. Equivalent to the command line --stimeout option.

logwtmp
update wtmp(5) as users connect and disconnect. See wtmp(1).

debug turns on debugging mode, sending debugging information to syslog(3). Has no effect
on pppd(8) debugging. Equivalent to the command line --debug option.

bcrelay internal-interface
turns on broadcast relay mode, sending all broadcasts received on the server's
internal interface to the clients. Equivalent to the command line --bcrelay
option.

connections n
limits the number of client connections that may be accepted. If pptpd is
allocating IP addresses (e.g. delegate is not used) then the number of connections
is also limited by the remoteip option. The default is 100.

delegate
delegates the allocation of client IP addresses to pppd(8). Without this option,
which is the default, pptpd manages the list of IP addresses for clients and passes
the next free address to pppd. With this option, pptpd does not pass an address,
and so pppd may use radius or chap-secrets to allocate an address.

localip ip-specification
one or many IP addresses to be used at the local end of the tunnelled PPP links
between the server and the client. If one address only is given, this address is
used for all clients. Otherwise, one address per client must be given, and if
there are no free addresses then any new clients will be refused. localip will be
ignored if the delegate option is used.

remoteip ip-specification
a list of IP addresses to assign to remote PPTP clients. Each connected client must
have a different address, so there must be at least as many addresses as you have
simultaneous clients, and preferably some spare, since you cannot change this list
without restarting pptpd. A warning will be sent to syslog(3) when the IP address
pool is exhausted. remoteip will be ignored if the delegate option is used.

noipparam
by default, the original client IP address is given to ip-up scripts using the
pppd(8) option ipparam. The noipparam option prevents this. Equivalent to the
command line --noipparam option.

listen ip-address
the local interface IP address to listen on for incoming PPTP connections (TCP port
1723). Equivalent to the command line --listen option.

vrf vrf-name
VRF to use for the TCP listening socket as well as the GRE packets. Equivalent to
the command line --vrf option.

pidfile pid-file
specifies an alternate location to store the process ID file (default
/var/run/pptpd.pid). Equivalent to the command line --pidfile option.

speed speed
specifies a speed (in bits per second) to pass to the PPP daemon as the interface
speed for the tty/pty pair. This is ignored by some PPP daemons, such as Linux's
pppd(8). The default is 115200 bytes per second, which some implementations
interpret as meaning "no limit". Equivalent to the command line --speed option.

NOTES

       An  ip-specification  above  (for  the  localip  and  remoteip  tags)  may be a list of IP
       addresses (for example 192.168.0.2,192.168.0.3), a range (for example  192.168.0.1-254  or
       192.168.0-255.2)  or  some  combination (for example 192.168.0.2,192.168.0.5-8).  For some
       valid pairs might be (depending on use of the VPN):

       localip 192.168.0.1
       remoteip 192.168.0.2-254

       or

       localip 192.168.1.2-254
       remoteip 192.168.0.2-254

ROUTING CHECKLIST - PROXYARP

       Allocate a section of your LAN addresses for use by clients.

       In /etc/ppp/options.pptpd.  set the proxyarp option.  In pptpd.conf  do  not  set  localip
       option,  but  set  remoteip  to  the allocated address range.  Enable kernel forwarding of
       packets, (e.g. using /proc/sys/net/ipv4/ip_forward ).

       The server will advertise the clients to the LAN using ARP, providing  it's  own  ethernet
       address.  bcrelay(8) should not be required.

ROUTING CHECKLIST - FORWARDING

       Allocate  a subnet for the clients that is routable from your LAN, but is not part of your
       LAN.

       In pptpd.conf set localip to a single address  or  range  in  the  allocated  subnet,  set
       remoteip  to  a range in the allocated subnet.  Enable kernel forwarding of packets, (e.g.
       using /proc/sys/net/ipv4/ip_forward ).  The LAN must have a route to the clients using the
       server as gateway.

       The server will forward the packets unchanged between the clients and the LAN.  bcrelay(8)
       will be required to support broadcast protocols such as NETBIOS.

ROUTING CHECKLIST - MASQUERADE

       Allocate a subnet for the clients that is not routable from your LAN,  and  not  otherwise
       routable from the server (e.g. 10.0.0.0/24).

       Set localip to a single address in the subnet (e.g. 10.0.0.1), set remoteip to a range for
       the rest of the subnet, (e.g. 10.0.0.2-200).  Enable kernel forwarding of  packets,  (e.g.
       using /proc/sys/net/ipv4/ip_forward ).  Enable masquerading on eth0 (e.g.  iptables -t nat
       -A POSTROUTING -o eth0 -j MASQUERADE ).

       The server will translate the packets between the clients and the LAN.  The  clients  will
       appear  to  the  LAN  as having the address corresponding to the server.  The LAN need not
       have an explicit route to the clients.  bcrelay(8) will be required to  support  broadcast
       protocols such as NETBIOS.

FIREWALL RULES

       pptpd(8)  accepts control connections on TCP port 1723, and then uses GRE (protocol 47) to
       exchange data packets.  Add these rules to your iptables(8) configuration, or use them  as
       the basis for your own rules:

       iptables --append INPUT --protocol 47 --jump ACCEPT
       iptables --append INPUT --protocol tcp --match tcp \
                --destination-port 1723 --jump ACCEPT