Pix 506e VPN tunnel and remote client ipsec access

Posted on 2006-05-24
Last Modified: 2013-11-16
I have a Pix 506e with a VPN tunnel connecting to a VPN3005 concentrator, which is working fine.  I am also trying to set up the Pix to serve ipsec clients using the Cisco VPN Client.  The VPN Client is not working, and I am wondering if it is even possible for the Pix to perform both of these functions at the same time.

The Pix is running 6.3(5) and the Cisco VPN Client is version

In case this is possible, and I am just not doing it right, I have included my Pix config.

PIX Version 6.3(5)
interface ethernet0 auto
interface ethernet1 auto
nameif ethernet0 outside security0
nameif ethernet1 inside security100
hostname ourhostname
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 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
name vpn-3005
access-list from-outside permit icmp any any echo-reply
access-list split-tunnel-acl permit ip
access-list to-hq-vpn permit ip
access-list to-hq-vpn permit ip
access-list to-hq-vpn permit ip
access-list to-hq-vpn permit ip
access-list no-nat permit ip
access-list no-nat permit ip
access-list no-nat permit ip
access-list no-nat permit ip
access-list no-nat permit ip
access-list no-nat permit ip
pager lines 24
mtu outside 1500
mtu inside 1500
ip address outside
ip address inside
ip audit info action alarm
ip audit attack action alarm
ip local pool vpn-pool
pdm logging informational 100
pdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 0 access-list no-nat
nat (inside) 1 0 0
access-group from-outside in interface outside
route outside 1
timeout xlate 0:05:00
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 sip-disconnect 0:02:00 sip-invite 0:03:00
timeout uauth 0:05:00 absolute
aaa-server TACACS+ protocol tacacs+
aaa-server TACACS+ max-failed-attempts 3
aaa-server TACACS+ deadtime 10
aaa-server RADIUS protocol radius
aaa-server RADIUS max-failed-attempts 3
aaa-server RADIUS deadtime 10
aaa-server LOCAL protocol local
aaa-server ms-ias protocol radius
aaa-server ms-ias max-failed-attempts 3
aaa-server ms-ias deadtime 10
aaa-server ms-ias (outside) host ******** timeout 5
http server enable
http inside
http inside
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
floodguard enable
sysopt connection permit-ipsec
sysopt connection permit-pptp
crypto ipsec transform-set hq-set esp-3des esp-md5-hmac
crypto ipsec transform-set vpn-set esp-aes esp-sha-hmac
crypto dynamic-map dynmap 20 set transform-set vpn-set
crypto map ourmap 10 ipsec-isakmp
crypto map ourmap 10 match address to-hq-vpn
crypto map ourmap 10 set pfs group2
crypto map ourmap 10 set peer vpn-3005
crypto map ourmap 10 set transform-set hq-set
crypto map ourmap 20 ipsec-isakmp dynamic dynmap
crypto map ourmap client authentication ms-ias
crypto map ourmap interface outside
isakmp enable outside
isakmp key ******** address vpn-3005 netmask
isakmp identity address
isakmp policy 10 authentication pre-share
isakmp policy 10 encryption 3des
isakmp policy 10 hash md5
isakmp policy 10 group 2
isakmp policy 10 lifetime 86400
isakmp policy 20 authentication pre-share
isakmp policy 20 encryption aes
isakmp policy 20 hash sha
isakmp policy 20 group 2
isakmp policy 20 lifetime 86400
vpngroup ipsec-group address-pool vpn-pool
vpngroup ipsec-group split-tunnel no-nat
vpngroup ipsec-group idle-time 1800
vpngroup ipsec-group password ********
telnet inside
telnet inside
telnet inside
telnet timeout 5
ssh timeout 5
management-access inside
console timeout 0
vpdn group 1 accept dialin pptp
vpdn group 1 ppp authentication pap
vpdn group 1 ppp authentication chap
vpdn group 1 ppp authentication mschap
vpdn group 1 ppp encryption mppe auto
vpdn group 1 client configuration address local vpn-pool
vpdn group 1 client configuration dns
vpdn group 1 client authentication aaa ms-ias
vpdn group 1 pptp echo 60
vpdn group ipsec-group client configuration address local vpn-pool
vpdn username vpnuser password *********
vpdn enable outside
dhcpd address inside
dhcpd dns
dhcpd lease 3600
dhcpd ping_timeout 750
dhcpd domain
terminal width 80
Question by:BRNIIT
    LVL 9

    Accepted Solution

    Make the following changes:

    no access-list no-nat permit ip
    no vpngroup ipsec-group split-tunnel no-nat
    vpngroup ipsec-group split-tunnel split-tunnel-acl
    isakmp nat-t

    Also, with regards to the following line:

    aaa-server ms-ias (outside) host ******** timeout 5

    Your IAS server has the IP of, as far as the PIX is concern, that is on the inside network not the outside. So you should change it to:

    aaa-server ms-ias (inside) host <preshared key> timeout 5

    If the VPN client still fails to connect. Enable the following debug on the PIX and post the output:

    debug crypto isa
    debug crypto ipsec

    LVL 9

    Expert Comment

    BTW, the PIX can perform both site to site and remote access at the same time.

    Author Comment

    Thank you very much - your suggestion worked perfectly.  If you don't mind, can you explain the isakmp nat-t statement?  I am still new at Pix stuff, and I would like to understand what that statement is doing.

    Thanks again.
    LVL 9

    Expert Comment

    The isakmp nat-t allows the user using the VPN Client to be able to connect and pass traffic over the tunnel when the user is connecting from a PAT device. When you say PAT, it means that there is more than one user using  the same public IP address.

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