[l2tp]

Overview configuration of L2TP module.

verbose=0|1

By default is disabled.

Specified will pptp module produce verbose logging.

bind=x.x.x.x

By default bound on all IP address.

If this option is given then l2tp server will bind to specified IP address.

port=n

By default port=1701

If this option is given then l2tp server will bind to specified port.

host-name=string

By default host-name=accel-ppp

This name will be sent to clients in Host-Name attribute.

hello-interval=n

By default hello-interval=60

Specifies interval in seconds to send Hello control message. Its used for keep alive connection. If peer will not respond to Hello connection will be terminated.

recv-window=n

By default recv-window=16 Available value range 1-32768.

Set the size of the local receive window. Only received messages whose sequence number is in the range [last-Nr + 1, last-Nr + recv-window] are accepted (where last-Nr is the sequence number of the last acknowledged message).

timeout=n

By default timeout=60

Specifies timeout in seconds to wait peer completes tunnel and session negotiation.

rtimeout=n
By default timeout=1

Specifies timeout (in seconds) to wait message acknowledge, if elapsed message retransmition will be performed. Timeout is multiplied by two after each retransmission. So if rtimeout is set to 1, first retransmission will occur after one second, second retransmission two seconds later, third one four seconds later, and so on, until a reply is received or the retransmit value is reached.

rtimeout-cap=n

By default rtimeout-cap=16

Set the maximum interval between retransmissions. The exponential backoff interval used by rtimeout will never grow above rtimeout-cap. rtimeout-cap must be higher than rtimeout and, according to RFC 2661, must be no less than 8 (though accel-ppp doesn’t enforce this rule).

retransmit=n

By default retransmit=5

Specifies maximum number of message retransmission, if exceeds connection will be terminated.

mppe=deny|allow|prefer|require

By default is not defined.

Default behavior - don’t ask client for mppe, but allow it if client wants.

secret=string

By default is not defined.

Specifies secret to connect to server.

hide-avps=0|1

By default hide-avps=0

If this option is given and hide-avps=1, then attributes sent in L2TP packets will be hidden (for AVPs that support it).

dataseq=deny|allow|prefer|require

By default dataseq=allow

Specify data sequencing negotiation algorithm:

  • deny - don’t send data packets with sequence numbers
  • allow - send data packets with sequence numbers if peer have requested so only
  • prefer - send data packets with sequence numbers and enable same for peer
  • require - send data packets with sequence numbers and enforce same for peer
reorder-timeout=n

By default reorder-timeout=0

Specifies timeout in milliseconds to wait for out-of-order packets. If 0, don’t try to reorder.

use-ephemeral-ports=0|1

By default use-ephemeral-ports=0

Specifies if an arbitrary source port is used when replying to a tunnel establishment request. When this option is deactivated, the destination port of the incoming request (SCCRQ) is used as source port for the reply (SCCRP).

ppp-max-mtu=n

By default ppp-max-mtu=1420

Set the maximun MTU value that can be negociated for PPP over L2TP sessions.

ifname=ifname

By default is not defined.

If this option is given ppp interface will be renamed using ifname as a template, i.e ifname=l2tp%d => l2tp0.

Note:

Also interface may renamed if RADIUS server send attribute ``NAS-Port-Id with custom name. Length this value not be more 16 characters.

avp_permissive=0|1

dir300_quirk=0|1

ip-pool=pool_name

By default is not defined.

Specifies ip pool name which accel-ppp will use for allocate client ip address.

Note:

For use ippool need add this module to [modules] section, and sets params on section [ip-pool]

ipv6-pool=pool_name

By default is not defined.

Specifies ipv6 pool name which accel-ppp will use for allocate client ipv6 prefix.

ipv6-pool-delegate=pool_name

By default is not defined.

Specifies ipv6 prefix delegation pool name which accel-ppp will use for allocate client ipv6 prefix delegation.