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AT-WR4500 Series - IEEE 802.11abgh Outdoor Wireless Routers 163
RouterOS v3 Configuration and User Guide
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: l2tp-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". Their 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 L2TP client named test2 using username john with password john to connect to the
10.1.1.12 L2TP server and use it as the default gateway:
[admin@AT-WR4562] interface l2tp-client> add name=test2 connect-to=10.1.1.12 \
\... user=john add-default-route=yes password=john
[admin@AT-WR4562] interface l2tp-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 l2tp-client> enable 0
8.5.3 Monitoring L2TP Client
Command name: /interface l2tp-client monitor
Property Description
encoding (text) - encryption and encoding (if asymmetric, separated with '/') being used n this connection
idle-time (read-only: time) - time since the last packet has been transmitted over this link
mru (read-only: integer) - effective MRU of the link
mtu (read-only: integer) - effective MTU of the link
status (text) - status of the client
dialing - attempting to make a connection
verifying password... - connection has been established to the server, password verification in progress
connected - self-explanatory
terminated - interface is not enabled or the other side will not establish a connection uptime (time) -
connection time displayed in days, hours, minutes and seconds
Example
Example of an established connection
[admin@AT-WR4562] interface l2tp-client> monitor test2
status: "connected"
uptime: 6h44m9s
idle-time: 6h44m9s
encoding: "MPPE128 stateless"
mtu: 1460
mru: 1460
[admin@AT-WR4562] interface l2tp-client>