Banging my head against the (fire)wall

[William Hoover]

ASA 5555, IOS 9.2 using ASDM 7.2

I have tried everything I can think of and cannot get incoming traffic to get through my rules.
I stripped it all down to one rule and still no luck. I know its something basic but I just don't get it.
When I run a packet trace on the NAT rule it works fine, when I try it on the access rule it fails
Please advise..

interface GigabitEthernet0/0
 nameif outside
 security-level 0
 ip address xxx.xxx.xxx.1 255.255.252.0
!
interface GigabitEthernet0/1
 nameif inside
 security-level 100
 ip address 10.0.0.1 255.255.0.0
!
interface GigabitEthernet0/2
 shutdown
 no nameif
 no security-level
 no ip address
!
interface GigabitEthernet0/3
 shutdown
 no nameif
 no security-level
 no ip address
!
interface GigabitEthernet0/4
 shutdown
 no nameif
 no security-level
 no ip address
!
interface GigabitEthernet0/5
 shutdown
 no nameif
 no security-level
 no ip address
!
interface GigabitEthernet0/6
 shutdown
 no nameif
 no security-level
 no ip address
!
interface GigabitEthernet0/7
 shutdown
 no nameif
 no security-level
 no ip address
!
interface Management0/0
 management-only
 no nameif
 no security-level
 no ip address
!
ftp mode passive
dns server-group DefaultDNS
 domain-name xxx.xxx.xxx
object network obj_any
 subnet 0.0.0.0 0.0.0.0
object network Email_Filter
 host 10.7.0.4
object service SMTP
 service tcp destination eq smtp
access-list outside_access_in extended permit tcp any object Email_Filter eq smtp
access-list inside_access_in extended permit ip any any
pager lines 24
logging asdm informational
mtu outside 1500
mtu inside 1500
no failover
icmp unreachable rate-limit 1 burst-size 1
no asdm history enable
arp timeout 14400
no arp permit-nonconnected
nat (inside,outside) source static Email_Filter interface service any SMTP
!
object network obj_any
 nat (any,outside) dynamic interface
access-group outside_access_in in interface outside
access-group inside_access_in in interface inside
route outside 0.0.0.0 0.0.0.0 xxx.xxx.xxx.2 1
route inside 10.7.0.0 255.255.255.255 10.0.0.4 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 10.0.0.1 255.255.255.255 inside
http 10.0.0.10 255.255.255.255 inside
no snmp-server location
no snmp-server contact
crypto ipsec security-association pmtu-aging infinite
crypto ca trustpool policy
telnet timeout 5
no ssh stricthostkeycheck
ssh timeout 5
ssh key-exchange group dh-group1-sha1
console timeout 0
threat-detection basic-threat
threat-detection statistics access-list
no threat-detection statistics tcp-intercept
!
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
!
service-policy global_policy global

Thanks!

[johnlloyd_13]

hi,

what kind of NAT isn't working? is is static or dynamic/PAT?

could you post a show nat output?

if you're referring to static NAT on your Email_Filter try:

object network Email_Filter
 host 10.7.0.4
 nat (inside,outside) static interface service tcp 25 25

[William Hoover]

I only setup one NAT, its the one for SMTP

sho nat

Manual NAT Policies (Section 1)
1 (inside) to (outside) source static Email_Filter interface   service any SMTP
    translate_hits = 0, untranslate_hits = 0

Auto NAT Policies (Section 2)
1 (any) to (outside) source dynamic obj_any interface
    translate_hits = 14092, untranslate_hits = 0

[Dennis Mink]

do you see the hitcount on the outside interface ACL increase at all?

[William Hoover]

FYI I am only using packet trace to check the config. I need to have it setup before I can test on the production network. If I use port 25 as the source port I do see the hit counter increase.

[Rahul Govindan]

I would rework your NAT rules to how @johnlloyd_13 mentioned in his reply. Your NAT statement has a few things wrong:

nat (inside,outside) source static Email_Filter interface service any SMTP

object service SMTP
 service tcp destination eq smtp

The NAT above translates the Email_Filter server's ip address to the interface. Also, any destination port is changed to tcp 25 during this translation. 

Since I assume that you are using the bidirectional nature of this rule to allow inbound smtp to your server, your rules should ideally look like:

nat (inside,outside) source static Email_Filter interface service SMTP SMTP

object service SMTP
 service tcp source eq smtp

[William Hoover]

Here is what I ended up with and it worked as long as the source port is 25, well in packet trace anyway, I need to try it in the production environment.

object service SMTP
 service tcp source eq smtp
object network Email_Filter
 host 10.7.0.4
 description Barracuda
access-list outside_access_in extended permit object SMTP any object Email_Filter

nat (inside,outside) source static Email_Filter interface service SMTP SMTP

Now I just have about 300 more NAT entries to create