Westermo MR Series - Manual (Page 120)

120 6622-3201
Web Interface and Command Line Reference Guide www.westermo.com
GP sockets use IP from interface:
This parameter allows general-purpose TCP sockets to use a source IP address other than that
of the interface on which the socket connection is created. The unit creates general-purpose
sockets automatically when your application requires them, e.g. when TPAD calls are made
over IP or XOT. Normally, the source address used by the socket will be that of the outgoing
interface (usually PPP). However, for some applications such as when set ting up a VPN, it may
be necessary to specify that the socket use a different source address such as that of the local
Ethernet port. This parameter is used to specify from which interface the source address should
be derived and may be set to “None” (default), “ETH” or “PPP”.
Note:
Even when this parameter is not set to “None”, normally the IP address from the interface on
which the socket is created will be used. The source address specified in this parameter will
only be used if it will cause the traffic to match an Eroute and therefore be sent over IPSec or
GRE.
GP sockets use IP from interface #:
This parameter is used in conjunction with the GP sockets use IP from interface parameter
above to select which interface instance is used to derive a source address.
GRE checksums::
This parameter selects whether to add GRE checksums to GRE packets when the unit is
terminat ing a GRE tunnel. “Off” disables checksums, “On” enables checksums.
Note:
From firmware version 4955 this web option and corresponding CLI commands have been
removed. GRE tunnels should be configured from Configure > Tunnel (GRE)
Additional FTP NAT port:
FTP control channels normally use TCP port 21 to carry the FTP commands. Consequently,
when NAT is enabled the unit monitors the FTP commands on this port number and checks for
the two FTP commands “PORT” and “PASV”. These commands contain information relating to
IP addresses which may need modifying during the NAT process. Such modifications may result
in different sized packets being generated that then require that the TCP sequence numbers be
mod ified to allow for the changes.
This parameter may be used to specify an additional port number (other than 21), which the
unit should monitor and is useful where FTP servers are known to be listening on non-standard
control channels.
RIP interval (s):
If this parameter is set to a non-zero value then RIP (Routing Information Protocol) packets will
be transmitted at the specified interval (in seconds). These packets contain the unit’s current
routes
(e.g. any active PPP instance routes), static routes and the default route.
IP route out of service time (s):
This specifies the time in (seconds), for which an IP route is flagged as “out of service” when
the route cannot be activated (i.e. the metric for the route is set to 16). This means the unit will
subse quently attempt to route packets through other routes with matching net masks that are
not out of service.
Alternative route delay (s):
This parameter is normally set to 0 and should not be changed without reference to Westermo
Techni cal Support.