ZyXEL Communications ZyXEL ZyWALL USG-1000, User Manual

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Chapter 21 IPSec VPN
ZyWALL USG 2000 User’s Guide
364
Extended Authentication
Extended authentication is often used when multiple IPSec routers use the same
VPN tunnel to connect to a single IPSec router. For example, this might be used
with telecommuters.
In extended authentication, one of the routers (the ZyWALL or the remote IPSec
router) provides a user name and password to the other router, which uses a local
user database and/or an external server to verify the user name and password. If
the user name or password is wrong, the routers do not establish an IKE SA.
You can set up the ZyWALL to provide a user name and password to the remote
IPSec router, or you can set up the ZyWALL to check a user name and password
that is provided by the remote IPSec router.
If you use extended authentication, it takes four more steps to establish an IKE
SA. These steps occur at the end, regardless of the negotiation mode (steps 7-10
in main mode, steps 4-7 in aggressive mode).
Certificates
It is possible for the ZyWALL and remote IPSec router to authenticate each other
with certificates. In this case, you do not have to set up the pre-shared key, local
identity, or remote identity because the certificates provide this information
instead.
• Instead of using the pre-shared key, the ZyWALL and remote IPSec router
check the signatures on each other’s certificates. Unlike pre-shared keys, the
signatures do not have to match.
• The local and peer ID type and content come from the certificates.
Note: You must set up the certificates for the ZyWALL and remote IPSec router first.
Regular Expressions in Searching IPSec SAs
A question mark (?) lets a single character in the VPN connection or policy name
vary. For example, use “a?c” (without the quotation marks) to specify abc, acc
and so on.
Wildcards (*) let multiple VPN connection or policy names match the pattern. For
example, use “*abc” (without the quotation marks) to specify any VPN connection
or policy name that ends with “abc”. A VPN connection named “testabc” would
match. There could be any number (of any type) of characters in front of the “abc”
at the end and the VPN connection or policy name would still match. A VPN
connection or policy name named “testacc” for example would not match.