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180 AT-WR4500 Series - IEEE 802.11abgh Outdoor Wireless Routers
RouterOS v3 Configuration and User Guide
Additional Resources
http://msdn.microsoft.com/library/backgrnd/html/understanding_pptp.htm
http://support.microsoft.com/support/kb/articles/q162/8/47.asp
http://support.microsoft.com/kb/154062/en-us
http://www.ietf.org/rfc/rfc2637.txt?number=2637
http://www.ietf.org/rfc/rfc3078.txt?number=3078
http://www.ietf.org/rfc/rfc3079.txt?number=3079
8.7.2 PPTP Client Setup
Submenu level: /interface pptp-client
Property Description
add-default-route (yes | no; default: no) - whether to use the server which this client is connected to
as its default router (gateway)
allow (multiple choice: mschap2, mschap1, chap, pap; default: mschap2, mschap1, chap, pap) - the
protocol to allow the client to use for authentication
connect-to (IP address) - The IP address of the PPTP server to connect to
max-mru (integer; default: 1460) - Maximum Receive Unit. The optimal value is the MRU of the
interface the tunnel is working over decreased by 40 (so, for 1500-byte Ethernet link, set the MRU to
1460 to avoid fragmentation of packets)
max-mtu (integer; default: 1460) - Maximum Transmission Unit. The optimal value is the MTU of the
interface the tunnel is working over decreased by 40 (so, for 1500-byte Ethernet link, set the MTU to
1460 to avoid fragmentation of packets)
mrru (integer: 512..65535; default: disabled) - maximum packet size that can be received on the link. If a
packet is bigger than tunnel MTU, it will be split into multiple packets, allowing full size IP or Ethernet
packets to be sent over the tunnel
disabled - disable MRRU on this link
name (name; default: pptp-outN) - interface name for reference
password (text; default: "") - user password to use when logging to the remote server
profile (name; default: default) - profile to use when connecting to the remote server
user (text) - user name to use when logging on to the remote server
Specifying MRRU means enabling MP (Multilink PPP) over single link. This protocol is used to split big
packets into smaller ones. Under Windows it can be enabled in Networking tag, Settings button,
"Negotiate multi-link for single link connections". Thei
r MRRU is hardcoded to 1614. This setting is
usefull to overcome PathMTU discovery failures. The MP should be enabled on both peers.
Example
To set up PPTP client named test2 using unsername john with password john to connect to the
10.1.1.12 PPTP server and use it as the default gateway:
[admin@AT-WR4562] interface pptp-client> add name=test2 connect-to=10.1.1.12 \
\... user=john add-default-route=yes password=john
[admin@AT-WR4562] interface pptp-client> print
Flags: X - disabled, R - running
0 X name="test2" mtu=1460 mru=1460 connect-to=10.1.1.12 user="john"
password="john" profile=default add-default-route=yes
allow=pap,chap,mschap1,mschap2
[admin@AT-WR4562] interface pptp-client> enable 0