ZyXEL Communications ZyWALL Troubleshooting Manual page 14

Vpn

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 If you are attempting to access resources using computer

hostname, try using the IP address assigned to the

computer/device instead. Using a computer hostname requires

the NetBIOS broadcast protocol to resolve the computers IP

address, broadcasts are not supported by the IPSec standard.

Because broadcasts are not supported by the IPSec VPN

standard we cannot guarantee that using hostnames instead of

IP's will work. A work around for this limitation of the IPSec

standard would be to use a WINS server.

 Make sure there are no IP conflicts, if the ZyWALL network is

configured to use the 192.168.1.0/24 network and the remote user

is also using the same IP scheme, traffic will not route through the

VPN tunnel properly.

 Make sure your network router is allowing the IPSec ports through

(UDP:500 and UDP:4500) or be sure to enable VPN pass-through if

the router supports this option. Bypass the router if possible to

make sure it is not causing the problem.

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