Pix 501 Authentication for outbound connection

I don't even know know if this is possible with the pix, but I believe it is if I'm reading the Cisco documentation correctly. What I'm looking at doing is while the PIX is constantly connected to the VPN I want the users to have to authenticate themselves when attempting to connect to any IP on the other side of the vpn. Then require them to reauth every 15-20minutes.

As I said I believe I can do this with the aaa-server in the pix, but i'm unsure how I would configure it.

Here is a example of the configuration I use in my 25 remote PIX's
PIX Version 6.3(3)
interface ethernet0 auto
interface ethernet1 100full
nameif ethernet0 outside security0
nameif ethernet1 inside security100
enable password *********** encrypted
passwd *************** encrypted
hostname router-location
domain-name example.com
fixup protocol dns maximum-length 512
fixup protocol ftp 21
fixup protocol h323 h225 1720
fixup protocol h323 ras 1718-1719
fixup protocol http 80
fixup protocol icmp error
fixup protocol rsh 514
fixup protocol rtsp 554
fixup protocol sip 5060
fixup protocol sip udp 5060
fixup protocol skinny 2000
fixup protocol smtp 25
fixup protocol sqlnet 1521
fixup protocol tftp 69
names
access-list outside_access_in permit tcp any any eq 5700
access-list outside_access_in permit tcp any any eq 5550
access-list outside_access_in permit tcp any any eq 4550
no pager
mtu outside 1500
mtu inside 1500
ip address outside dhcp setroute
ip address inside 192.168.103.254 255.255.255.0
ip audit info action alarm
ip audit attack action alarm
pdm location 192.168.0.0 255.255.0.0 outside
pdm location 192.168.0.0 255.255.0.0 inside
pdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 1 0.0.0.0 0.0.0.0 0 0
static (inside,outside) tcp interface 5700 192.168.103.80 5700 netmask 255.255.255.255 0 0
static (inside,outside) tcp interface 5550 192.168.103.80 5550 netmask 255.255.255.255 0 0
static (inside,outside) tcp interface 4550 192.168.103.80 4550 netmask 255.255.255.255 0 0
access-group outside_access_in in interface outside
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 rpc 0:10:00 h225 1:00:00
timeout h323 0:05:00 mgcp 0:05:00 sip 0:30:00 sip_media 0:02:00
timeout uauth 0:05:00 absolute
aaa-server TACACS+ protocol tacacs+
aaa-server RADIUS protocol radius
aaa-server LOCAL protocol local
no snmp-server location
no snmp-server contact
snmp-server community public
snmp-server enable traps
floodguard enable
sysopt connection permit-ipsec
isakmp enable outside
isakmp keepalive 10
isakmp nat-traversal 20
telnet 192.168.0.0 255.255.0.0 inside
telnet 0.0.0.0 0.0.0.0 inside
telnet timeout 5
ssh X.X.X.X X.X.X.X outside
ssh 192.168.0.0 255.255.0.0 inside
ssh timeout 5
console timeout 0
vpnclient server X.X.X.X
vpnclient mode network-extension-mode
vpnclient vpngroup GROUPNAME password ********
vpnclient username NETWORKNAME password ********
vpnclient management tunnel 192.168.0.0 255.255.0.0
vpnclient enable
terminal width 80

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PyromanciAsked:
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fgasimzadeCommented:
I dont think it is possible

aaa is used for authentication, but for remote access VPN authentication, not for site-to-site VPN
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PyromanciAuthor Commented:
Any idea on how I could achieve this then?
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fgasimzadeCommented:
Here is a guide:

http://www.cisco.com/en/US/docs/security/asa/asa72/configuration/guide/vpnrmote.html

But again, this is fo remote access VPNs, not for site-to-site
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PyromanciAuthor Commented:
Sorry, I meant achieve what I'm trying to do without using the Pix, since the aaa-server is for remote access VPN's. The have the VPN up, but require some sort of additional authentication required before the traffic is allowed.

The reasons I'm trying to figure this out is I have a couple remote locations that are having a 3rd parties VPN added into the network. The 3rd party is allowed to remotely control a couple of the computers. Computers that need access to both VPN's. So I'm just trying to boost our vpn's security to prevent that third party from even attempting to get into anything on our end.

The reason i need to leave the VPN up at all times, is because at any time I need to get back into the remote locations at any given point. Some times even after hours to do maintenance.
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PyromanciAuthor Commented:
I ended up designing a captive portal system. Using a spare Linux server and converting it into a router.
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