asa5510 Split tunnel config kills VPN entirely

cannongroup · ‎09-22-2014

Activating a split-tunnel configuration managed to kill VPN access to hosts on the inside interface completely. (as in a logged in VPN user can no longer ping or RDP to a host on the inside) Did I miss something at 4am? Bug in 9.0(2) ? It worked before adding the split-tunnel config...

redacted config:

Result of the command: "show run"

: Saved
:
ASA Version 9.0(2)
!
hostname redacted
enable password redacted/ encrypted
names
ip local pool ippool3 192.168.10.1-192.168.10.254 mask 255.255.255.0
ip local pool ippool150 172.16.1.150-172.16.1.200 mask 255.255.255.0
!
interface Ethernet0/0
shutdown
no nameif
no security-level
no ip address
!
interface Ethernet0/1
nameif inside
security-level 100
ip address 172.16.1.1 255.255.255.0
!
interface Ethernet0/2
nameif outside
security-level 0
ip address 6.76.156.30 255.255.255.240
!
interface Ethernet0/3
shutdown
no nameif
no security-level
no ip address
!
interface Management0/0
management-only
nameif management
security-level 100
ip address 10.10.10.3 255.255.255.0
!
ftp mode passive
access-list split standard permit 172.16.1.0 255.255.255.0
pager lines 24
logging enable
logging asdm informational
mtu management 1500
mtu outside 1500
mtu inside 1500
no failover
icmp unreachable rate-limit 1 burst-size 1
asdm image disk0:/asdm-645-206.bin
no asdm history enable
arp timeout 14400
no arp permit-nonconnected
!
nat (any,outside) after-auto source dynamic any interface
route outside 0.0.0.0 0.0.0.0 6.76.156.17 1
timeout xlate 3:00:00
timeout pat-xlate 0:00:30
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
user-identity default-domain LOCAL
http server enable
http 192.168.10.0 255.255.255.0 management
http 0.0.0.0 0.0.0.0 management
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart warmstart
crypto ipsec ikev1 transform-set ESP-AES-256-MD5 esp-aes-256 esp-md5-hmac
crypto ipsec ikev1 transform-set ESP-DES-SHA esp-des esp-sha-hmac
crypto ipsec ikev1 transform-set ESP-3DES-SHA esp-3des esp-sha-hmac
crypto ipsec ikev1 transform-set ESP-DES-MD5 esp-des esp-md5-hmac
crypto ipsec ikev1 transform-set ESP-AES-192-MD5 esp-aes-192 esp-md5-hmac
crypto ipsec ikev1 transform-set ESP-3DES-MD5 esp-3des esp-md5-hmac
crypto ipsec ikev1 transform-set ESP-AES-256-SHA esp-aes-256 esp-sha-hmac
crypto ipsec ikev1 transform-set ESP-AES-128-SHA esp-aes esp-sha-hmac
crypto ipsec ikev1 transform-set ESP-AES-192-SHA esp-aes-192 esp-sha-hmac
crypto ipsec ikev1 transform-set ESP-AES-128-MD5 esp-aes esp-md5-hmac
crypto ipsec security-association pmtu-aging infinite
crypto dynamic-map SYSTEM_DEFAULT_CRYPTO_MAP 65535 set ikev1 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 ca trustpool policy
crypto ikev1 enable outside
crypto ikev1 policy 10
authentication crack
encryption aes-256
hash sha
group 2
lifetime 86400
crypto ikev1 policy 20
authentication rsa-sig
encryption aes-256
hash sha
group 2
lifetime 86400
crypto ikev1 policy 30
authentication pre-share
encryption aes-256
hash sha
group 2
lifetime 86400
crypto ikev1 policy 40
authentication crack
encryption aes-192
hash sha
group 2
lifetime 86400
crypto ikev1 policy 50
authentication rsa-sig
encryption aes-192
hash sha
group 2
lifetime 86400
crypto ikev1 policy 60
authentication pre-share
encryption aes-192
hash sha
group 2
lifetime 86400
crypto ikev1 policy 70
authentication crack
encryption aes
hash sha
group 2
lifetime 86400
crypto ikev1 policy 80
authentication rsa-sig
encryption aes
hash sha
group 2
lifetime 86400
crypto ikev1 policy 90
authentication pre-share
encryption aes
hash sha
group 2
lifetime 86400
crypto ikev1 policy 100
authentication crack
encryption 3des
hash sha
group 2
lifetime 86400
crypto ikev1 policy 110
authentication rsa-sig
encryption 3des
hash sha
group 2
lifetime 86400
crypto ikev1 policy 120
authentication pre-share
encryption 3des
hash sha
group 2
lifetime 86400
crypto ikev1 policy 130
authentication crack
encryption des
hash sha
group 2
lifetime 86400
crypto ikev1 policy 140
authentication rsa-sig
encryption des
hash sha
group 2
lifetime 86400
crypto ikev1 policy 150
authentication pre-share
encryption des
hash sha
group 2
lifetime 86400
crypto ikev1 policy 65535
authentication pre-share
encryption 3des
hash sha
group 2
lifetime 86400
telnet timeout 5
ssh timeout 5
console timeout 0
threat-detection basic-threat
threat-detection statistics access-list
no threat-detection statistics tcp-intercept
group-policy analyticDEV internal
group-policy analyticDEV attributes
vpn-tunnel-protocol ikev1
split-tunnel-policy tunnelspecified
split-tunnel-network-list value split
username redacted password redacted encrypted
username redacted password redacted encrypted
tunnel-group analyticDEV type remote-access
tunnel-group analyticDEV general-attributes
address-pool ippool150
default-group-policy analyticDEV
tunnel-group analyticDEV ipsec-attributes
ikev1 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: redacted
: end

Jouni Forss · ‎09-22-2014

Hi,

You dont seem to have any NAT0 configuration and that means that all traffic matches the Dynamic PAT configuration and because of that the connection attempts fail the NAT RPF check.

I would suggest that you start with changing your VPN pool to something else than the LAN network.

Since you have another VPN Pool configured and not in use you could do the following

tunnel-group analyticDEV general-attributes
address-pool ippool3

Then configure NAT0

object network VPN-POOL
subnet 192.168.10.0 255.255.255.0

object network LAN
subnet 172.16.1.0 255.255.255.0

nat (inside,outside) source static LAN LAN destination static VPN-POOL VPN-POOL

These changes to my understanding should correct your problem

Hope this helps :)

EDIT: Corrected the typo where I mentioned NAT Pool instead of VPN Pool

- Jouni

cannongroup · ‎09-24-2014

Well that didn't seem to help. Any other ideas?

Jouni Forss · ‎09-24-2014

Hi,

Well the suggest configurations should do the trick. We really need more information about what the situation is when you are connected with the VPN Client.

Can you show us the Secured Routes (or similiar) section of the VPN Client when its connected? Could you also show the Statistics page after you have tested connectivity so we can see if any traffic is actually forwarded to the VPN connections.

You could also use the following commands on the ASA when you have connected with the VPN Client and have tested some connections

show crypto ipsec sa

show nat

Have you tried connections to multiple hosts on the LAN so that the problem is not for example a single server that you cannot access?

Also, just to make sure, can you list the following configurations again

show run object network

show run nat

show run group-policy

show run tunnel-group

- Jouni