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PIX 515E - VPN Connections

amitsb7
Level 1
Level 1

Hi,

I have pix 515E and I have configured VPN on it. My users login to my network from internet via Cisco VPN client.

I have problem, only one machine from their LAN can do VPN by Cisco VPN client to my Network at a time.

Users are connected to LAN Switch and to internet via ADSL router.

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PIX Config:

PIX Version 6.3(4)

interface ethernet0 auto

interface ethernet1 auto

nameif ethernet0 outside security0

nameif ethernet1 inside security100

enable password xxxxxxxxxxxxxxx encrypted

passwd xxxxxxxxxxxxxxxx encrypted

hostname ABCDEFGH

domain-name ABCD.com

clock timezone EST -5

clock summer-time EDT recurring

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

access-list inside_out-nat0_acl permit ip 192.168.1.0 255.255.255.0 192.168.2.0 255.255.255.0

access-list split permit ip 192.168.1.0 255.255.255.0 192.168.1.0 255.255.255.0

pager lines 24

mtu outside 1500

mtu inside 1500

ip address outside xxx.xxx.xxx.xxx 255.255.255.0

ip address inside 192.168.1.1 255.255.255.0

ip audit info action alarm

ip audit attack action alarm

ip local pool vpnpool 192.168.2.1-192.168.2.254

pdm logging informational 100

pdm history enable

arp timeout 14400

global (outside) 10 interface

nat (inside) 0 access-list inside_out-nat0_acl

nat (inside) 10 0.0.0.0 0.0.0.0 0 0

route outside 0.0.0.0 0.0.0.0 xxx.xxx.xxx.xxx 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 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 RADIUS (inside) host ABCDE timeout 10

aaa-server LOCAL protocol local

aaa-server radius protocol radius

aaa-server radius max-failed-attempts 3

aaa-server radius deadtime 10

aaa-server partnerauth protocol radius

aaa-server partnerauth max-failed-attempts 3

aaa-server partnerauth deadtime 10

aaa-server partnerauth (inside) host ABCDEFG myvpn1 timeout 10

http server enable

http 192.168.1.0 255.255.255.0 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 set transform-set ESP-3DES-MD5

crypto map outside_map 65535 ipsec-isakmp dynamic outside_dyn_map

crypto map outside_map client authentication partnerauth

crypto map outside_map interface outside

isakmp enable outside

isakmp key ******** address 0.0.0.0 netmask 0.0.0.0

isakmp identity address

isakmp policy 8 authentication pre-share

isakmp policy 8 encryption 3des

isakmp policy 8 hash md5

isakmp policy 8 group 2

isakmp policy 8 lifetime 86400

isakmp policy 10 authentication pre-share

isakmp policy 10 encryption 3des

isakmp policy 10 hash sha

isakmp policy 10 group 2

isakmp policy 10 lifetime 86400

vpngroup myvpn address-pool vpnpool

vpngroup myvpn dns-server ABCDE

vpngroup myvpn default-domain ABCD.com

vpngroup myvpn split-tunnel split

vpngroup myvpn idle-time 1800

vpngroup myvpn password ********

telnet 192.168.1.0 255.255.255.0 inside

telnet timeout 5

ssh timeout 5

console timeout 0

dhcpd address 192.168.1.200-192.168.1.254 inside

dhcpd dns ABCDE

dhcpd lease 3600

dhcpd ping_timeout 750

dhcpd domain ABCD.com

dhcpd auto_config outside

dhcpd enable inside

terminal width 80

--------------------------------------------------

Thanks in advance.

- Amit

1 Accepted Solution

Accepted Solutions

sstudsdahl
Level 4
Level 4

Try adding the commmand "isakmp nat-traversal" to your PIX. I suspect what is happening is that the remote LAN users are getting translated to a single IP address as they pass through the DSL connection. I would also guess that the device doing the translation has an IPSec passthrough capability. Linksys routers would be a good example of this type of NAT device that allows the IPSec passthrough.

If this is the case, only one VPN connection will be able to function at a time. The command above will enable the PIX to detect clients that are behind a NAT device and will then try to setup the VPN sessions within UDP packets and thus get around the limitation of the NAT device and IPSec passthrough.

View solution in original post

2 Replies 2

sstudsdahl
Level 4
Level 4

Try adding the commmand "isakmp nat-traversal" to your PIX. I suspect what is happening is that the remote LAN users are getting translated to a single IP address as they pass through the DSL connection. I would also guess that the device doing the translation has an IPSec passthrough capability. Linksys routers would be a good example of this type of NAT device that allows the IPSec passthrough.

If this is the case, only one VPN connection will be able to function at a time. The command above will enable the PIX to detect clients that are behind a NAT device and will then try to setup the VPN sessions within UDP packets and thus get around the limitation of the NAT device and IPSec passthrough.

Thanks, Steve.