I got it, it should be written like this, not two lines, hope this will help new guys. : 
authserver  ip1:1812 
ip2:1812

On Mon, Sep 20, 2010 at 12:56 PM, Spacelee <fjctlzy@gmail.com> wrote:
# RADIUS server to use for authentication requests. this config
# item can appear more then one time. if multiple servers are
# defined they are tried in a round robin fashion if one
# server is not answering.
# optionally you can specify a the port number on which is remote
# RADIUS listens separated by a colon from the hostname. if
# no port is specified /etc/services is consulted of the radius
# service. if this fails also a compiled in default is used.
authserver ip1:1812
authserver ip2:1812

I use pptp+ppp+freeradius+mysql

and in the radiusclient.conf, it set two authsever server, so that it's round robin.
 but in fact, when I stop ip1, ip2 is up, it's ok, and then i stop ip2, ip1 is up, it's not ok
what's the problem, have you met before ?

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Space Lee




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Space Lee