[VPN] Pix 515E VPN tunnel Via Cisco Client 4.0 thru a Nattted home DSL router
Hart, Kevin
KHart at helixtechnology.com
Mon Sep 13 10:27:05 EDT 2004
If I understand this correct...the VPN client behind a PAT device cannot
connect to the PIX 515 firewall.
Isakmp NAT traversal on the PIX will allow multiple clients behind a PAT
device to connect, but is not related to your problem.
It would seem that you need to enable IPSEC passthrough on your home network
device. Do you have a router
behind the DSL modem. If not, is there any way to enable this on the DSL
modem. The other possibility is
that your ISP is blocking IPSEC.
Are you logging to Syslog on the PIX? This will give you good information as
to what is happening on that end.
Kevin
-----Original Message-----
From: Marc Stavale [mailto:MStavale at airmethods.com]
Sent: Friday, September 10, 2004 5:46 PM
To: vpn at lists.shmoo.com
Subject: [VPN] Pix 515E VPN tunnel Via Cisco Client 4.0 thru a Nattted home
DSL router
Scenario: I have a Pix 515E configured to access a VPN tunnel. If I dial
into the internet thru AT&T and get an IP of 206.x.x.x (internet routable),
address and try to negotiate a tunnel using the Cisco VPN Client I can do so
no problems. However, if I try to do one from my 'house' which is behind my
DSL modem and thus has a natted address (IE: my modem outside is routable
but my inside address on my computer is a 192.168.0.x address's), my tunnel
fails. Here is a copy of my Pix config and I do have the 'isakmp
nat-traversal' command in it but it still fails. I havn't configured my
inside conduits yet as just want to get the tunnel working first. Any
ideas?
Building configuration...
: Saved
:
PIX Version 6.3(3)133
interface ethernet0 100full
interface ethernet1 100full
interface ethernet2 auto shutdown
nameif ethernet0 outside security0
nameif ethernet1 inside security100
nameif ethernet2 intf2 security4
enable password fOtLfvYl90/VEkOk encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
hostname denvervpn
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
names
access-list 102 permit ip 192.168.0.0 255.255.252.0 192.168.113.0
255.255.255.0
pager lines 24
mtu outside 1500
mtu inside 1500
mtu intf2 1500
ip address outside 12.45.111.234 255.255.255.248
ip address inside 192.168.8.17 255.255.255.248
no ip address intf2
ip audit info action alarm
ip audit attack action alarm
ip local pool vpnpool 192.168.113.1-192.168.113.254
pdm history enable
arp timeout 14400
nat (inside) 0 access-list 102
conduit permit icmp any any
route outside 0.0.0.0 0.0.0.0 12.45.111.225 1
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
no snmp-server enable traps
floodguard enable
sysopt connection permit-ipsec
crypto ipsec transform-set myset esp-des esp-md5-hmac
crypto dynamic-map dynmap 10 set transform-set myset
crypto map mymap 10 ipsec-isakmp dynamic dynmap
crypto map mymap client configuration address initiate
crypto map mymap client configuration address respond
crypto map mymap interface outside
crypto map map1 10 ipsec-isakmp dynamic map2
isakmp enable outside
isakmp identity address
isakmp client configuration address-pool local vpnpool outside
isakmp nat-traversal 10
isakmp policy 10 authentication pre-share
isakmp policy 10 encryption des
isakmp policy 10 hash md5
isakmp policy 10 group 2
isakmp policy 10 lifetime 86400
vpngroup base1 address-pool vpnpool
vpngroup base1 dns-server 192.168.0.125
vpngroup base1 wins-server 192.168.0.126
vpngroup base1 default-domain amc.local
vpngroup base1 idle-time 1800
vpngroup base1 password ********
vpngroup base2 address-pool vpnpool
vpngroup base2 dns-server 192.168.0.125
vpngroup base2 wins-server 192.168.0.126
vpngroup base2 default-domain amc.local
vpngroup base2 split-tunnel 102
vpngroup base2 idle-time 1800
vpngroup base2 password ********
telnet timeout 5
ssh timeout 60
console timeout 0
terminal width 80
Cryptochecksum:5ddd4c6f87bb9677e21fdff9262b50ac
: end
[OK]
Marc Stavale
Network Engineer
Airmethods
7211 S. Peoria St.
Englewood Co. 80112
303-792-7491
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