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WendellUrth

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Configuring Pix 501 for VPN remote access

Hi all,
I have a CISCO pix 501 setup at the office to provide firewall and VPN. Internet connection is working fine from Office- > Pix -> Internet.

I have been through the VPN wizard to enable remote access. This appears to have been set fine, but when i connect from home using Cisco VPN client 4.6.04.0043, i can see that my virtual CISCO ethernet adapter recieves an ip address from the pool configured, but i cannot ping the inside interface of the pix, or any other computers on the remote LAN. I also cannot communicate with them using other methods (RDP, VNC etc).I cannot tracert to anything (gets nowhere), and the addition of the isakmp nat-traversal 300 command (as previously advised) stops me being able to connect to the VPN. The pix external interface is a public IP provided by my ISP

I have included my firewall config below with any company specific details, public IPS and passwords hashed out.
I have included my IP config output once connected to the VPN if that helps!!

Thanks

Assistance much appreciated!

PIX Version 6.3(5)
interface ethernet0 auto
interface ethernet1 100full
nameif ethernet0 outside security0
nameif ethernet1 inside security100
enable password xxxxxxxxxxxxxxx encrypted
passwd xxxxxxxxxxxxx encrypted
hostname pixfirewall
domain-name ciscopix.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 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 inside_outbound_nat0_acl permit ip 10.0.0.0 255.255.255.0 192.168.10.0 255.255.255.224 
access-list outside_cryptomap_dyn_20 permit ip any 192.168.10.0 255.255.255.224 
access-list outside_cryptomap_dyn_40 permit ip any 192.168.10.0 255.255.255.224 
pager lines 24
mtu outside 1500
mtu inside 1500
ip address outside xx.xxx.xxx.90 255.255.255.248
ip address inside 10.0.0.1 255.255.255.0
ip audit info action alarm
ip audit attack action alarm
ip local pool xxxxxx_VPN 192.168.10.10-192.168.10.20
pdm logging informational 100
pdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 0 access-list inside_outbound_nat0_acl
nat (inside) 1 0.0.0.0 0.0.0.0 0 0
route outside 0.0.0.0 0.0.0.0 xx.xxx.xxx.89 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 
http server enable
http 0.0.0.0 0.0.0.0 outside
http 10.0.0.0 255.255.255.0 inside
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 ESP-3DES-MD5 esp-3des esp-md5-hmac 
crypto dynamic-map outside_dyn_map 20 match address outside_cryptomap_dyn_20
crypto dynamic-map outside_dyn_map 20 set transform-set ESP-3DES-MD5
crypto dynamic-map outside_dyn_map 40 match address outside_cryptomap_dyn_40
crypto dynamic-map outside_dyn_map 40 set transform-set ESP-3DES-MD5
crypto map outside_map 65535 ipsec-isakmp dynamic outside_dyn_map
crypto map outside_map client authentication LOCAL 
crypto map outside_map interface outside
isakmp enable outside
isakmp policy 20 authentication pre-share
isakmp policy 20 encryption 3des
isakmp policy 20 hash md5
isakmp policy 20 group 2
isakmp policy 20 lifetime 86400
vpngroup Levexis address-pool xxxxxx_VPN
vpngroup Levexis dns-server xx.xxx.xxx.10 xx.xxx.xxx.8
vpngroup Levexis idle-time 1800
vpngroup Levexis password xxxxxx
telnet timeout 5
ssh timeout 5
console timeout 0
dhcpd address 10.0.0.2-10.0.0.129 inside
dhcpd lease 3600
dhcpd ping_timeout 750
dhcpd auto_config outside
username testuser xxxxxxxxxxxx encrypted privilege 15
terminal width 80
 
 
My ip config output:
 
 
Windows IP Configuration
 
        Host Name . . . . . . . . . . . . : xxxxxx
        Primary Dns Suffix  . . . . . . . :
        Node Type . . . . . . . . . . . . : Mixed
        IP Routing Enabled. . . . . . . . : No
        WINS Proxy Enabled. . . . . . . . : No
 
PPP adapter T-Mobile:
 
        Connection-specific DNS Suffix  . :
        Description . . . . . . . . . . . : WAN (PPP/SLIP) Interface
        Physical Address. . . . . . . . . : 00-53-45-00-00-00
        Dhcp Enabled. . . . . . . . . . . : No
        IP Address. . . . . . . . . . . . : 10.35.180.90
        Subnet Mask . . . . . . . . . . . : 255.255.255.255
        Default Gateway . . . . . . . . . : 10.35.180.90
        DNS Servers . . . . . . . . . . . : 149.254.192.126
                                            149.254.201.126
        Primary WINS Server . . . . . . . : 10.11.12.13
        Secondary WINS Server . . . . . . : 10.11.12.14
        NetBIOS over Tcpip. . . . . . . . : Disabled
 
Ethernet adapter PUBLIC:
 
        Media State . . . . . . . . . . . : Media disconnected
        Description . . . . . . . . . . . : Intel(R) PRO/1000 PL Network Connect
ion
        Physical Address. . . . . . . . . : 00-13-72-1B-1B-24
 
Ethernet adapter Local Area Connection:
 
        Connection-specific DNS Suffix  . :
        Description . . . . . . . . . . . : Cisco Systems VPN Adapter
        Physical Address. . . . . . . . . : 00-05-9A-3C-78-00
        Dhcp Enabled. . . . . . . . . . . : No
        IP Address. . . . . . . . . . . . : 192.168.10.10
        Subnet Mask . . . . . . . . . . . : 255.255.255.0
        Default Gateway . . . . . . . . . : 192.168.10.10
        DNS Servers . . . . . . . . . . . : xx.xxx.xxx.10
                                            xx.xxx.xxx.8

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Pete Long
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WendellUrth

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Hi there, this had now been added but to no avail! My config shows this command as below:

isakmp enable outside
isakmp nat-traversal 20
isakmp policy 20 authentication pre-share
isakmp policy 20 encryption 3des
isakmp policy 20 hash md5
isakmp policy 20 group 2
isakmp policy 20 lifetime 86400

Under Status -> Statistics in my VPN client:Transport -> Transparent tunneling i get:
Active on UDP port 4500

Still no luck . Any pointers as to where i troubleshoot now?

Thanks
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clokendagger

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WendellUrth

ASKER

Hi clokendagger,

Many thanks for your continued help and patience.

I have removed the redundant crypto map stuff etc.

The addition of the Nat traversal command seems to have done the trick perfectly. I can now ping a particular host within the network, and can Remote desktop to it.

To clarify for others viewing this solution:

The addition of :

isakmp nat-traversal 20

solved my problem.

i have now a further problem to solve, but i shall do this in another post ( i need to route VPN traffic out through the firewall - this is so that i can access secure servers on the internet that allow access by IP from a VPN ).

Thanks very much for the help, i will mark this as solved. If you can help with my next problem.. i'll be posting in a sec and would be very grateful of your wisdom!!

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WendellUrth

ASKER

Apologies PeteLong, i meant to thank you here too.
clokendagger actually suggested the isakmp command in a previous question that i closed as i confused the issue. However, you have added it here. I will therefore split the points as you have both been very helpful.
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Pete Long
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ThanQ
Cisco
Cisco

Cisco PIX is a dedicated hardware firewall appliance; the Cisco Adaptive Security Appliance (ASA) is a firewall and anti-malware security appliance that provides unified threat management and protection the PIX does not. Other Cisco devices and systems include routers, switches, storage networking, wireless and the software and hardware for PIX Firewall Manager (PFM), PIX Device Manager (PDM) and Adaptive Security Device Manager (ASDM).

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