RE: Pix 515E VPN tunnel Via Cisco Client 4.0 thru a Nattted home DSL router

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:[email protected]]
Sent: Friday, September 10, 2004 5:46 PM
To: [email protected]
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