I have an EZVPN running between two locations, Location A has a 5520 and is the EZVPN server, Location B has a 5506 and is a EZVPN client. Currently I'm trying to set NAT and ACL(s) so that hosts on the Location B inside network can access a few servers in Location A's DMZ. Below are my packet traces from both locations. Attached are sanitized configs from both locations.
*
*LocationA-Firewall# packet-tracer input inside tcp <Location B inside ip> 443 <Location A DMZ server ip> 443 detailed
Phase: 1
Type: ROUTE-LOOKUP
Subtype: input
Result: ALLOW
Config:
Additional Information:
in <Location B inside ip> 255.255.255.0 outside
Phase: 2
Type: UN-NAT
Subtype: static
Result: ALLOW
Config:
nat (dmz,outside) source static DMZ_Servers DMZ_Servers destination static (location B)-remote_network (location B)-remote_network no-proxy-arp route-lookup
Additional Information:
NAT divert to egress interface outside
Untranslate <Location B inside ip>/443 to <Location B inside ip>/443
Phase: 3
Type: ACCESS-LIST
Subtype:
Result: DROP
Config:
Implicit Rule
Additional Information:
Forward Flow based lookup yields rule:
in id=0x73cb5f60, priority=11, domain=permit, deny=true
hits=343658, user_data=0x5, cs_id=0x0, use_real_addr, flags=0x0, protocol=0
src ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=0
dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=0, dscp=0x0
input_ifc=dmz, output_ifc=any
Result:
input-interface: dmz
input-status: up
input-line-status: up
output-interface: outside
output-status: up
output-line-status: up
Action: drop
Drop-reason: (acl-drop) Flow is denied by configured rule*
*
===========================================================
LocationB-Firewall# packet-tracer input inside tcp <Location B inside ip> 443 <Location A DMZ server ip> 443
Phase: 1
Type: ACCESS-LIST
Subtype:
Result: ALLOW
Config:
Implicit Rule
Additional Information:
MAC Access list
Phase: 2
Type: ROUTE-LOOKUP
Subtype: Resolve Egress Interface
Result: ALLOW
Config:
Additional Information:
found next-hop <internet next hop> using egress ifc outside
Phase: 3
Type: UN-NAT
Subtype: static
Result: ALLOW
Config:
nat (inside,outside) source static Location_B_Networks Location_B_Networks destination static Remote_DMZ Remote_DMZ no-proxy-arp route-lookup
Additional Information:
NAT divert to egress interface outside
Untranslate <Location A DMZ server ip>/443 to <Location A DMZ server ip>/443
Phase: 4
Type: ACCESS-LIST
Subtype: log
Result: ALLOW
Config:
access-group OWL_inside in interface inside
access-list OWL_inside extended permit ip any4 any4
Additional Information:
Phase: 5
Type: NAT
Subtype:
Result: ALLOW
Config:
nat (inside,outside) source static Location_B_Networks Location_B_Networks destination static Remote_DMZ Remote_DMZ no-proxy-arp route-lookup
Additional Information:
Static translate <Location B inside ip>/443 to <Location B inside ip>/443
Phase: 6
Type: NAT
Subtype: per-session
Result: ALLOW
Config:
Additional Information:
Phase: 7
Type: IP-OPTIONS
Subtype:
Result: ALLOW
Config:
Additional Information:
Phase: 8
Type: ACCESS-LIST
Subtype: aaa-user
Result: ALLOW
Config:
Additional Information:
Phase: 9
Type: NAT
Subtype: rpf-check
Result: ALLOW
Config:
nat (inside,outside) source static Location_B_Networks Location_B_Networks destination static Remote_DMZ Remote_DMZ no-proxy-arp route-lookup
Additional Information:
Phase: 10
Type: NAT
Subtype: per-session
Result: ALLOW
Config:
Additional Information:
Phase: 11
Type: IP-OPTIONS
Subtype:
Result: ALLOW
Config:
Additional Information:
Phase: 12
Type: FLOW-CREATION
Subtype:
Result: ALLOW
Config:
Additional Information:
New flow created with id 568767, packet dispatched to next module
Result:
input-interface: inside
input-status: up
input-line-status: up
output-interface: outside
output-status: up
output-line-status: up
Action: allow
On those packet traces I'm testing HTTPS access since it's one of the ports I need open across the two zones. Since it looks like the problem with Location A's ASA, I've tried the following NAT and ACL additions (outside_access_in is the ACL applied to the outside interface, dmz_access_in is the ACL applied to the DMZ):
access-list dmz_access_in extended permit tcp object (location B)-remote_network object-group DMZ_Servers eq https
nat (dmz,outside) source static DMZ_Servers DMZ_Servers destination static (location B)-remote_network (location B)-remote_network no-proxy-arp route-lookup
access-list outside_access_in extended permit tcp object (location B)-remote_network object-group DMZ_Servers eq https
None of those worked. Besides those ACL entries I have no entries in my ACLs concerning traffic from Location B. ASP packet captures have not helped either. Sanitized configs for both locations are as follows:
:
ASA Version 9.5(2)
!
hostname LocationB-Firewall
domain-name company.com
names
!
interface GigabitEthernet1/1
nameif outside
security-level 0
ip address dhcp setroute
!
interface GigabitEthernet1/2
nameif inside
security-level 100
ip address (location B inside) 255.255.255.0
!
interface Management1/1
management-only
no nameif
no security-level
no ip address
!
boot system disk0:/asa952-lfbff-k8.SPA
ftp mode passive
dns server-group DefaultDNS
domain-name oscarwinski.com
object network obj_any
subnet 0.0.0.0 0.0.0.0
object-group network Location_A_Networks
network-object (Location A network).0 255.255.255.0
object-group network Location_B_Networks
network-object (Location B network).0 255.255.255.0
object-group network Remote_DMZ
network-object host <Location A dmz server IP>
access-list LocationB_inside extended permit ip any4 any4
access-list outside_access_in extended permit tcp host <internet IP> object-group Location_B_Networks eq https
no pager
logging console emergencies
logging buffered debugging
logging asdm informational
mtu outside 1500
mtu inside 1500
icmp unreachable rate-limit 1 burst-size 1
e
arp timeout 14400
no arp permit-nonconnected
nat (inside,outside) source static Location_B_Networks Location_B_Networks destination static Location_A_Networks Location_A_Networks no-proxy-arp route-lookup
nat (inside,outside) source static Location_B_Networks Location_B_Networks destination static Remote_DMZ Remote_DMZ no-proxy-arp route-lookup
!
object network obj_any
nat (any,outside) dynamic interface
access-group outside_access_in in interface outside
access-group LocationB_inside in interface inside
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 sctp 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
user-identity default-domain LOCAL
aaa authentication ssh console LOCAL
http server enable
http 192.168.1.0 255.255.255.0 inside
http 0.0.0.0 0.0.0.0 inside
no snmp-server location
no snmp-server contact
service sw-reset-button
crypto ipsec security-association pmtu-aging infinite
crypto ca trustpool policy
telnet timeout 5
no ssh stricthostkeycheck
ssh (Location A outside interface) 255.255.255.255 outside
ssh 0.0.0.0 0.0.0.0 inside
ssh timeout 5
ssh key-exchange group dh-group1-sha1
console timeout 0
vpnclient server (outside interface)
vpnclient mode network-extension-mode
vpnclient nem-st-autoconnect
vpnclient vpngroup vpn password *****
vpnclient username ezvpn password *****
vpnclient enable
!
dhcpd address (location B network)-(location B network) inside
dhcpd enable inside
!
threat-detection basic-threat
threat-detection statistics access-list
no threat-detection statistics tcp-intercept
dynamic-access-policy-record DfltAccessPolicy
!
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 pptp
!
service-policy global_policy global
prompt hostname context
: end
Location A below:
ASA Version 9.1(3)
!
hostname LocationA-Firewall
domain-name company.com
interface GigabitEthernet0/0
nameif outside
security-level 0
ip address (location A outside) 255.255.255.240
!
interface GigabitEthernet0/1
nameif inside
security-level 100
ip address (location A inside) 255.255.255.0
!
!
object network (location B)-remote_network
subnet (location B) 255.255.255.0
object-group network (Location A)_Networks
network-object (Location A) 255.255.255.0
object-group network DMZ_Servers
network-object <DMZ servers IPs>
access-list ezvpn_split extended permit tcp object-group (Location A)_Networks object (location B)-remote_network
nat (dmz,outside) source static DMZ_Servers DMZ_Servers destination static (location B)-remote_network (location B)-remote_network no-proxy-arp route-lookup
nat (inside,outside) source static (Location A)_Networks (Location A)_Networks destination static (location B)-remote_network (location B)-remote_network no-proxy-arp route-lookup
access-group outside_access_in in interface outside
access-group inside in interface inside
access-group dmz_access_in in interface dmz
!
crypto ipsec ikev1 transform-set TRANS_ESP_3DES_SHA esp-3des esp-sha-hmac
crypto ipsec ikev1 transform-set TRANS_ESP_3DES_SHA mode transport
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-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 ikev1 transform-set ESP-3DES-MD5 esp-3des esp-md5-hmac
crypto ipsec ikev1 transform-set ESP-AES128-SHA esp-aes esp-sha-hmac
crypto ipsec ikev1 transform-set aes256set esp-aes-256 esp-sha-hmac
crypto ipsec security-association pmtu-aging infinite
crypto dynamic-map SYSTEM_DEFAULT_CRYPTO_MAP 65535 set ikev1 transform-set TRANS_ESP_3DES_SHA
crypto dynamic-map vpn_dyn_map 1 set ikev1 transform-set aes256set
crypto dynamic-map vpn_dyn_map 1 set reverse-route
crypto dynamic-map vpn_dyn_map 500 set ikev1 transform-set ESP-3DES-MD5
crypto map VPN 65535 ipsec-isakmp dynamic vpn_dyn_map
crypto map VPN interface outside
crypto isakmp identity address
crypto isakmp nat-traversal 10
crypto ikev1 enable outside
crypto ikev1 policy 5
authentication pre-share
encryption aes
hash sha
group 2
lifetime 86400
crypto ikev1 policy 10
authentication pre-share
encryption 3des
hash sha
group 2
lifetime 86400
crypto ikev1 policy 20
authentication pre-share
encryption 3des
hash md5
group 2
lifetime 86400
crypto ikev1 policy 90
authentication pre-share
encryption aes-256
hash sha
group 5
lifetime 86400
ssh 0.0.0.0 0.0.0.0 inside
management-access inside
no vpn-addr-assign aaa
no vpn-addr-assign dhcp
group-policy DfltGrpPolicy attributes
vpn-tunnel-protocol ikev1 l2tp-ipsec ssl-client ssl-clientless
!username ezvpn password <removed>
vpn-group-policy DefaultRAGroup
tunnel-group DefaultL2LGroup ipsec-attributes
ikev1 pre-shared-key <removed>
tunnel-group DefaultRAGroup ppp-attributes
no authentication chap
authentication ms-chap-v2
tunnel-group ezvpn type remote-access
tunnel-group ezvpn general-attributes
default-group-policy ezvpnpolicy
tunnel-group ezvpn ipsec-attributes
ikev1 pre-shared-key <removed>
tunnel-group (location A outside) type ipsec-l2l
tunnel-group (location A outside) ipsec-attributes
ikev1 pre-shared-key <removed>
!
class-map preset_dns_map
class-map global-class
match access-list global_mpc
class-map apple_class
match access-list dmz_access_in
class-map inspection_default
match default-inspection-traffic
!
policy-map type inspect dns preset_dns_map
parameters
message-length maximum 512
policy-map type inspect http apple_map
parameters
match not request header host regex apple_domain
policy-map global_policy
description Internet_Netflow
class inspection_default
inspect dns preset_dns_map
inspect ftp
inspect h323 h225
inspect h323 ras
inspect netbios
inspect rsh
inspect skinny
inspect sqlnet
inspect sunrpc
inspect tftp
inspect xdmcp
inspect http
inspect icmp
inspect rtsp
inspect sip
class global-class
flow-export event-type all destination 10.1.1.25
class apple_class
inspect http apple_map
!
service-policy global_policy global
prompt hostname context
: end
EDIT: Here's what I see in my logging after running packet traces in both directions:
Location A
Feb 4 10:05:08 10.255.1.1 %ASA-5-111008: User 'enable_15' executed the 'packet-tracer input dmz tcp <DMZ Server IP> 443 <Location B Inside IP> 443' command.
Feb 4 10:05:08 10.255.1.1 %ASA-5-111010: User 'enable_15', running 'CLI' from IP x.x.x.x, executed 'packet-tracer input dmz tcp <DMZ Server IP> 443 <Location B Inside IP> 443'
Location B
Feb 4 08:50:30 <Location B Inside IP> %ASA-5-111008: User 'enable_15' executed the 'packet-tracer input inside tcp <Location B Inside IP> 443 <DMZ Server IP> 443' command.
Feb 4 08:50:30 <Location B Inside IP> %ASA-5-111010: User 'enable_15', running 'CLI' from IP x.x.x.x, executed 'packet-tracer input inside tcp <Location B Inside IP> 443 <DMZ Server IP> 443'
Feb 4 08:51:15 <Location B Inside IP> %ASA-7-609001: Built local-host outside:<DMZ Server IP>
Feb 4 08:51:15 <Location B Inside IP> %ASA-6-302013: Built outbound TCP connection 936480 for outside:<DMZ Server IP>/443 (<DMZ Server IP>/443) to inside:<Location B Inside IP>45/50378 (<Location B Inside IP>45/50378)
Feb 4 08:51:45 <Location B Inside IP> %ASA-6-302014: Teardown TCP connection 936480 for outside:<DMZ Server IP>/443 to inside:<Location B Inside IP>45/50378 duration 0:00:30 bytes 0 SYN Timeout
Feb 4 08:51:45 <Location B Inside IP> %ASA-7-609002: Teardown local-host outside:<DMZ Server IP> duration 0:00:30
Both locations have the following logging options turned on:
logging enable
logging timestamp
logging standby
logging buffer-size 1048576
logging console emergencies
logging monitor debugging
logging buffered debugging
logging trap debugging
logging asdm notifications
logging facility 23
logging host inside <syslog server IP>
I also thought possibly adding the dmz network I wanted to get in into the split tunnel list on the EZVPN would work, it did not:
access-list ezvpn_split extended permit tcp object-group DMZ_Servers object (location B)-remote_network
Edit: Added ACL statements to both configs
Best Answer
Here's the solution after a lot of pounding my head against this problem: 1) Take out the nat statements at Location B since they interfere with the VPN tunnel:
2) Keep the DMZ statement in the split tunnel ACL:
3) I had the access list entry switch around for no good reason. It was this:
when it should have been this: