Configure L2TP to ignore IP address and/or UDP port changes on incoming
SCCRP messages. When this feature is enabled the L2TP tunnel may have
separate receive and transmit address and/or port values to the
remote host.
disable(0) - change is not ignored
ipAddressAndUdpPort(1)- ignore both address and port changes
ipAddress(2) - ignore address changes only
udpPort(3) - ignore port changes only.