Motorola Netopia 3342N - Manual (Page 153)

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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 other wise instructed. Accepted values are from 100 – 1500.
This is the star ting 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 other wise 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 suppor ted 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/
Password Xauth authentication credentials.
Table 3: IPSec Tunnel Details page parameters