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9.3

Trouble passing traffic through IPSEC-IPSEC Spoof Detected

Asked by downscm in Cisco PIX Firewall, IPSec Security Protocol, Networking Hardware Firewalls

Tags: Cisco, ASA, 5520, IPSEC Spoof detected

I am trying to set up an alternative VPN server on our network. The outside interface is set to a public IP, and the inside interface is connected to one of our core switches, and able to freely access the inside network. My outside client connects fine, and split tunneling is working because they can still conect to external sites. They can't however get to devices inside the network. I used the packet tracer and the packet is dropped because an IPSEC Spoof detected. I am sure it is a NAT problem, I guess I just don't understand NAT well enough. I will paste my relevent config to see if someone can point me in the right direction. The internal network is 10.0.0.0./16 and the IP pool I have given VPN users is 192.168.250.0/24. There shouldn't be any internal firewall blockage. Lines with XX i removed for security. 
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ASA Version 8.0(4) 
!
hostname XX
domain-name XX
names
!
interface GigabitEthernet0/0
 nameif outside
 security-level 1
 ip address 204.2.XXX.XXX 255.255.255.0 
 ospf cost 10
!
interface GigabitEthernet0/1
 nameif inside
 security-level 100
 dhcp client route distance 2
 ip address dhcp setroute 
 ospf cost 10
!
ftp mode passive
dns domain-lookup inside
dns server-group DefaultDNS
 name-server 10.0.0.252
 name-server 10.0.0.253
 name-server 10.0.0.254
 domain-name XX
same-security-traffic permit inter-interface
same-security-traffic permit intra-interface
access-list inside_nat0_outbound extended permit ip any 192.168.250.0 255.255.255.0 
access-list InsomVPN standard permit 10.0.0.0 255.255.0.0 
access-list InsomVPN standard permit 192.168.0.0 255.255.0.0 
access-list InsomVPN standard permit 192.168.20.0 255.255.255.0 
access-list outside_access_in extended permit ip 192.168.250.0 255.255.255.0 any 
pager lines 24
logging enable
logging asdm informational
mtu outside 1500
mtu inside 1500
mtu management 1500
ip local pool InsomVPNpool 192.168.250.1-192.168.250.254 mask 255.255.255.0
no failover
icmp unreachable rate-limit 1 burst-size 1
asdm image disk0:/asdm-613.bin
no asdm history enable
arp timeout 14400
nat-control
nat (inside) 0 access-list inside_nat0_outbound
access-group outside_access_in in interface outside
route outside 0.0.0.0 0.0.0.0 204.2.209.1 1
route inside 0.0.0.0 0.0.0.0 10.0.0.1 3
route inside 10.0.0.0 255.255.0.0 192.168.20.2 1
route outside 0.0.0.0 0.0.0.0 192.168.20.2 tunneled
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00
timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00
timeout sip-provisional-media 0:02:00 uauth 0:05:00 absolute
dynamic-access-policy-record DfltAccessPolicy
http server enable
http 192.168.1.0 255.255.255.0 management
no snmp-server location
no snmp-server contact
snmp-server community insomniac
snmp-server enable traps snmp authentication linkup linkdown coldstart
crypto ipsec transform-set ESP-3DES-SHA esp-3des esp-sha-hmac 
crypto ipsec transform-set ESP-AES-256-MD5 esp-aes-256 esp-md5-hmac 
crypto ipsec transform-set ESP-DES-SHA esp-des esp-sha-hmac 
crypto ipsec transform-set ESP-DES-MD5 esp-des esp-md5-hmac 
crypto ipsec transform-set ESP-AES-192-MD5 esp-aes-192 esp-md5-hmac 
crypto ipsec transform-set ESP-3DES-MD5 esp-3des esp-md5-hmac 
crypto ipsec transform-set ESP-AES-256-SHA esp-aes-256 esp-sha-hmac 
crypto ipsec transform-set ESP-AES-128-SHA esp-aes esp-sha-hmac 
crypto ipsec transform-set ESP-AES-192-SHA esp-aes-192 esp-sha-hmac 
crypto ipsec transform-set ESP-AES-128-MD5 esp-aes esp-md5-hmac 
crypto ipsec security-association lifetime seconds 28800
crypto ipsec security-association lifetime kilobytes 4608000
crypto dynamic-map SYSTEM_DEFAULT_CRYPTO_MAP 65535 set pfs 
crypto dynamic-map SYSTEM_DEFAULT_CRYPTO_MAP 65535 set transform-set ESP-AES-128-SHA ESP-AES-128-MD5 ESP-AES-192-SHA ESP-AES-192-MD5 ESP-AES-256-SHA ESP-AES-256-MD5 ESP-3DES-SHA ESP-3DES-MD5 ESP-DES-SHA ESP-DES-MD5
crypto dynamic-map SYSTEM_DEFAULT_CRYPTO_MAP 65535 set security-association lifetime seconds 28800
crypto dynamic-map SYSTEM_DEFAULT_CRYPTO_MAP 65535 set security-association lifetime kilobytes 4608000
crypto map outside_map 65535 ipsec-isakmp dynamic SYSTEM_DEFAULT_CRYPTO_MAP
crypto map outside_map interface outside
crypto map inside_map 65535 ipsec-isakmp dynamic SYSTEM_DEFAULT_CRYPTO_MAP
crypto map inside_map interface inside
crypto isakmp enable outside
crypto isakmp enable inside
crypto isakmp policy 10
 authentication pre-share
 encryption 3des
 hash sha
 group 2
 lifetime 86400
telnet timeout 5
ssh timeout 5
console timeout 0
dhcp-client client-id interface inside
dhcpd address 192.168.1.2-192.168.1.254 management
dhcpd enable management
!
threat-detection basic-threat
threat-detection scanning-threat shun except ip-address 10.0.0.0 255.255.0.0
threat-detection statistics host
threat-detection statistics port
threat-detection statistics protocol
threat-detection statistics access-list
no threat-detection statistics tcp-intercept
group-policy insomVPN internal
group-policy insomVPN attributes
 vpn-simultaneous-logins 3
 vpn-idle-timeout none
 vpn-session-timeout none
 vpn-tunnel-protocol IPSec l2tp-ipsec 
 split-tunnel-policy tunnelspecified
 split-tunnel-network-list value InsomVPN
 default-domain value XX
 vlan none
username downscm password BBMZjP/C8CdwwPEI encrypted privilege 15
tunnel-group insomVPN type remote-access
tunnel-group insomVPN general-attributes
 address-pool InsomVPNpool
 default-group-policy insomVPN
tunnel-group insomVPN ipsec-attributes
 pre-shared-key *
!
class-map inspection_default
 match default-inspection-traffic
!
!
policy-map type inspect dns preset_dns_map
 parameters
  message-length maximum 512
policy-map global_policy
 class inspection_default
  inspect dns preset_dns_map 
  inspect ftp 
  inspect h323 h225 
  inspect h323 ras 
  inspect rsh 
  inspect rtsp 
  inspect esmtp 
  inspect sqlnet 
  inspect skinny  
  inspect sunrpc 
  inspect xdmcp 
  inspect sip  
  inspect netbios 
  inspect tftp 
!
service-policy global_policy global
prompt hostname context 
Cryptochecksum:988b255ae409fd61e215c53e04a1f856
: end
asdm image disk0:/asdm-613.bin
no asdm history enable
[+][-]09/25/08 11:02 AM, ID: 22572184Accepted Solution

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About this solution

Zones: Cisco PIX Firewall, IPSec Security Protocol, Networking Hardware Firewalls
Tags: Cisco, ASA, 5520, IPSEC Spoof detected
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Solution Provided By: harbor235
Participating Experts: 2
Solution Grade: A
 
[+][-]09/25/08 05:56 AM, ID: 22568503Expert Comment

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[+][-]09/25/08 10:43 AM, ID: 22572022Author Comment

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[+][-]09/25/08 11:26 AM, ID: 22572394Author Comment

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[+][-]09/26/08 06:47 AM, ID: 22579412Expert Comment

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