10-25-2013 12:46 PM - edited 02-21-2020 07:16 PM
I'm trying to set up a new VPN user/group/policy to replace a flawed old version that used IP addresses from the same pool as the inside VLAN. As of right now I have most things configured but am unable to establish a connection to a service host on the inside VLAN with the new configuration. The old configuration works fine. Other services like RDP are working fine on the new configuration.
I *thought* that I had everything configured to use the new IP addresses in ACL lists, NAT Excemptions and the like but must have a conflict or missing rule somewhere I can't spot. Using the packet tracer everything works except when I test 192.168.16.x -> 192.168.15.x on interface outside, it says "IPSEC Spoof Detected" as the reason for dropping packets. When attempting to establish the connection there is no errors, just "Built inbound TCP..." followed by "Teardown TCP... SYN Timeout 00:30"
For the record the 192.168.16.100-150 pool is the correct VPN address pool.
Once I have it working 100% I'd like to remove the 192.168.15.200-250 pool from the ASDM configuration.
My configurations:
: Saved
:
ASA Version 8.2(5)
!
hostname SEMC-TEST
enable password D37rIydCZ/bnf1uj encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
names
name 192.168.15.0 192.168.15.0 description Internal Network devices
ddns update method DDNS_Update
ddns both
interval maximum 0 4 0 0
!
!
interface Ethernet0/0
switchport access vlan 2
!
interface Ethernet0/1
!
interface Ethernet0/2
!
interface Ethernet0/3
!
interface Ethernet0/4
!
interface Ethernet0/5
!
interface Ethernet0/6
!
interface Ethernet0/7
!
interface Vlan1
description VLAN to inside hosts
nameif inside
security-level 100
ddns update hostname 0.0.0.0
ddns update DDNS_Update
dhcp client update dns server both
ip address 192.168.15.1 255.255.255.0
!
interface Vlan2
description External VLAN to internet
nameif outside
security-level 0
ip address xx.xx.xx.xx 255.255.255.248
!
ftp mode passive
clock timezone CST -6
clock summer-time CDT recurring
dns domain-lookup inside
dns server-group DefaultDNS
name-server 216.221.96.37
name-server 8.8.8.8
same-security-traffic permit inter-interface
same-security-traffic permit intra-interface
object-group service DM_INLINE_TCP_1 tcp
port-object eq www
port-object eq https
access-list outside_access_in extended permit icmp any any
access-list outside_access_in extended permit ip 192.168.16.0 255.255.255.0 any
access-list outside_access_in extended permit ip 192.168.15.192 255.255.255.192 any
access-list outside_access_in extended permit ip 192.168.15.0 255.255.255.0 192.168.16.0 255.255.255.0
access-list Remote_test_splitTunnelAcl standard permit 192.168.15.0 255.255.255.0
access-list inside_nat0_outbound extended permit ip 192.168.15.0 255.255.255.0 192.168.15.192 255.255.255.192
access-list inside_nat0_outbound extended permit ip 192.168.15.0 255.255.255.0 192.168.16.0 255.255.255.0
access-list inside_access_in extended permit ip 192.168.15.192 255.255.255.192 any
access-list inside_access_in extended permit ip interface inside interface inside
access-list inside_access_in extended permit ip any 192.168.15.192 255.255.255.192
access-list inside_access_in extended permit icmp any any
access-list inside_access_in extended permit ip any 192.168.16.0 255.255.255.0
access-list inside_access_in extended permit ip 192.168.16.0 255.255.255.0 any
access-list inside_access_in remark Block Internet Traffic
access-list inside_access_out extended permit icmp 192.168.15.0 255.255.255.0 any
access-list inside_access_out extended permit ip 192.168.15.192 255.255.255.192 any
access-list inside_access_out extended permit ip 192.168.15.0 255.255.255.0 192.168.15.192 255.255.255.192
access-list inside_access_out extended permit ip 192.168.16.0 255.255.255.0 any
pager lines 24
logging enable
logging asdm informational
mtu inside 1500
mtu outside 1500
ip local pool VPN_IP_Alt 192.168.16.100-192.168.16.150 mask 255.255.255.0
ip local pool VPN_IP_Pool 192.168.15.200-192.168.15.250 mask 255.255.255.0
ipv6 access-list inside_access_ipv6_in permit ip interface inside interface inside
icmp unreachable rate-limit 1 burst-size 1
icmp permit any inside
icmp permit any echo-reply inside
icmp permit any echo-reply outside
icmp permit any outside
no asdm history enable
arp timeout 14400
nat-control
global (inside) 2 interface
global (outside) 1 interface
nat (inside) 0 access-list inside_nat0_outbound_2
access-group inside_access_in in interface inside
access-group inside_access_ipv6_in in interface inside
access-group outside_access_in in interface outside
route outside 0.0.0.0 0.0.0.0 xx.xx.xx.xx 1
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
timeout tcp-proxy-reassembly 0:01:00
timeout floating-conn 0:00:00
dynamic-access-policy-record DfltAccessPolicy
http server enable
http 192.168.15.0 255.255.255.0 inside
http 192.168.16.0 255.255.255.0 inside
no snmp-server location
no snmp-server contact
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 group1
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 map outside_map 65535 ipsec-isakmp dynamic SYSTEM_DEFAULT_CRYPTO_MAP
crypto map outside_map interface outside
crypto isakmp enable outside
crypto isakmp policy 10
authentication pre-share
encryption 3des
hash sha
group 2
lifetime 86400
telnet timeout 5
ssh timeout 5
console timeout 0
management-access inside
dhcpd auto_config outside
!
dhcpd address 192.168.15.200-192.168.15.250 inside
dhcpd enable inside
!
no threat-detection basic-threat
threat-detection statistics access-list
threat-detection statistics tcp-intercept rate-interval 30 burst-rate 400 average-rate 200
ntp server 192.168.15.101 source inside
ntp server 192.168.15.100 source inside prefer
webvpn
group-policy Remote_test_Alt internal
group-policy Remote_test_Alt attributes
vpn-tunnel-protocol IPSec
split-tunnel-policy tunnelspecified
split-tunnel-network-list value Remote_test_splitTunnelAcl
group-policy Remote_test internal
group-policy Remote_test attributes
vpn-tunnel-protocol IPSec
split-tunnel-policy tunnelspecified
split-tunnel-network-list value Remote_test_splitTunnelAcl
username StockUser password t6a0Nv8HUfWtUdKz encrypted privilege 0
username StockUser attributes
vpn-group-policy Remote_test
username StockUser2 password t6a0Nv8HUfWtUdKz encrypted privilege 0
username StockUser2 attributes
vpn-group-policy Remote_test_Alt
tunnel-group Remote_test type remote-access
tunnel-group Remote_test general-attributes
address-pool VPN_IP_Pool
default-group-policy Remote_test
tunnel-group Remote_test ipsec-attributes
pre-shared-key *****
tunnel-group Remote_test2 type remote-access
tunnel-group Remote_test2 general-attributes
address-pool VPN_IP_Alt
default-group-policy Remote_test_Alt
tunnel-group Remote_test2 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 client auto
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
inspect ip-options
inspect icmp
inspect icmp error
!
service-policy global_policy global
prompt hostname context
no call-home reporting anonymous
Cryptochecksum:834543b67beaaa65578d8032d7d272c3
: end
10-26-2013 01:37 PM
Hi Graham,
If you are running packet tracer from outside to inside it will always fail as it can not replicate the encrypted packet and associated SA. Try sending the actual traffic from vpn client and let me know if it works
Regards
~Harry
Sent from Cisco Technical Support Android App
10-28-2013 07:09 AM
Harry,
I appreciate the reply and apologise for taking so long to respond myself. When trying to connect to the service it still fails, I was using the Packet Tracer as a quicker means of testing.
However, after further investigation Friday I believe the issue I am having may be with the service itself. It is a specialized device which, after reviewing its routing table has no route for 192.168.16.x addresses. I cannot update this configuration without scheduling a critical downtime hopefully within the next week.
Again I appreciate the response but unfortunately my issue might not have to do with the VPN configuration at all!
10-28-2013 08:19 AM
Thanks Graham,
Let me know in case you ever need my help
~Harry
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