Motorola 2200 Administrator's Handbook page 153

Table 3: IPSec Tunnel Details page parameters
IPSec MTU Some ISPs require a setting of e.g. 1492 (or other value). The default
1500 is the most common and you usually don't need to change this
unless otherwise instructed. Accepted values are from 100 – 1500.
This is the starting value that is used for the MTU when the IPSec tunnel is
installed. It specifies the maximum IP packet length for the encapsulated
AH or ESP packets sent by the router. The MTU used on the IPSec connec-
tion will be automatically adjusted based on the MTU value in any received
ICMP can't fragment error messages that correspond to IPSec traffic initi-
ated from the router. Normally the MTU only requires manual configuration
if the ICMP error messages are blocked or otherwise not received by the
router.
Xauth Enable
Extended Authentication (XAuth), an extension to the Internet Key
Exchange (IKE) protocol. The Xauth extension provides dual authentication
for a remote user's Motorola Netopia® Gateway to establish a VPN, autho-
rizing network access to the user's central office. IKE establishes the tun-
nel, and Xauth authenticates the specific remote user's Gateway. Since
NAT is supported over the tunnel, the remote user network can have multi-
ple PCs behind the client Gateway accessing the VPN. By using XAuth, net-
work VPN managers can centrally control remote user authentication.
Xauth Username/
Xauth authentication credentials.
Password
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