Cisco ISA500 Series Administration Manual page 115

Networking
Configuring the WAN
Cisco ISA500 Series Integrated Security Appliance Administrator Guide
Network Configurations
Addressing
Mode
PPTP The PPTP protocol is typically used for VPN connection. Use
the necessary information from your ISP to complete the PPTP
configurations:
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NOTE
that the MTU values be left as is.
IP Address: Enter the IP address of the WAN port that
can be accessable from the Internet.
Netmask: Enter the IP address of the subnet mask.
Gateway: Enter the IP address of default gateway.
User Name/Password: Enter the user name and
password that are required to log into the PPTP server.
PPTP Server IP Address: Enter the IP address of the
PPTP server.
MPPE Encryption: Microsoft Point-to-Point Encryption
(MPPE) encrypts data in PPP-based dial-up connections
or PPTP VPN connections. Check the box to enable the
MPPE encryption to provide data security for the PPTP
connection that is between the VPN client and VPN
server.
Connect Idle Time: Choose this option to let the security
appliance disconnect from the Internet after a specified
period of inactivity (Idle Time). This choice is
recommended if your ISP fees are based on the time that
you spend online.
Keep Live: Choose this option to keep the connection
always on, regardless of the level of activity. This choice
is recommended if you pay a flat fee for your Internet
service.
MTU: Choose Auto to use the default MTU size, or
choose Manual if you want to specify another size.
MTU Value: If you choose Manual, enter the custom MTU
size in bytes.
Unless a change is required by your ISP, it is recommended
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