Quick Reference Guide

ProSafe VPN Firewall 50 FVS338 Reference Manual
5-20 Virtual Private Networking
v1.0, January 2010
The extKeyUsage would govern the certificate acceptance criteria in the FVS338 when the same
digital certificate is being used for secure web management.
In the VPN firewall, the uploaded digital certificate is checked for validity and also the purpose of
the certificate is verified. Upon passing the validity test and the purpose matches its use (has to be
SSL and VPN) the digital certificate is accepted. The additional check for the purpose of the
uploaded digital certificate must correspond to use for VPN and secure web remote management
via HTTPS. If the purpose defined is for VPN and HTTPS then the certificate is uploaded to the
HTTPS certificate repository and as well in the VPN certificate repository. If the purpose defined
is only for VPN then the certificate is only uploaded to the VPN certificate repository. Thus,
certificates used by HTTPS and IPsec will be different if their purpose is not defined to be VPN
and HTTPS.
The VPN firewall uses digital certificates to authenticate connecting VPN gateways or clients, and
to be authenticated by remote entities. A certificate that authenticates a server, for example, is a
file that contains:
• A public encryption key to be used by clients for encrypting messages to the server.
• Information identifying the operator of the server.
• A digital signature confirming the identity of the operator of the server. Ideally, the signature is
from a trusted third party whose identity can be verified absolutely.
You can obtain a certificate from a well-known commercial Certificate Authority (CA) such as
Verisign or Thawte, or you can generate and sign your own certificate. Because a commercial CA
takes steps to verify the identity of an applicant, a certificate from a commercial CA provides a
strong assurance of the server’s identity. A self-signed certificate will trigger a warning from most
browsers as it provides no protection against identity theft of the server.
The VPN firewall contains a self-signed certificate from NETGEAR. We recommend that you
replace this certificate prior to deploying the VPN firewall in your network.
From the Certificates screen, you can view the currently loaded certificates, upload a new
certificate and generate a Certificate Signing Request (CSR). Your VPN firewall will typically
hold two types of certificates:
• CA certificate. Each CA issues its own CA identity certificate in order to validate
communication with the CA and to verify the validity of certificates signed by the CA.
• Self certificate. The certificate issued to you by a CA identifying your device.