cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
569
Views
0
Helpful
2
Replies

Cisco ASA NAT SSH issue

CliveAllen
Level 1
Level 1

SSH will not pass through the ASA with NAT.

 

The NAT rule is basic and is the only rule that exists.

 

It appears that the packets are ignoring the rules list and going straight to the implicit deny.

 

Anyone seen this before?

2 Replies 2

balaji.bandi
Hall of Fame
Hall of Fame

Can you post the full configuration and failed logs.

 

BB

***** Rate All Helpful Responses *****

How to Ask The Cisco Community for Help

xlate per-session deny tcp any4 any4
xlate per-session deny tcp any4 any6
xlate per-session deny tcp any6 any4
xlate per-session deny tcp any6 any6
xlate per-session deny udp any4 any4 eq domain
xlate per-session deny udp any4 any6 eq domain
xlate per-session deny udp any6 any4 eq domain
xlate per-session deny udp any6 any6 eq domain
passwd NuLKvvWGg.x9HEKO encrypted
names
ip local pool VPN_POOL xxx.xxx.xxx.xxx - xxx.xxx.xxx.xxx mask 255.255.255.240

!
interface GigabitEthernet0/0
description To-HEX-CORE-02-ge-1/0/2_VPN
nameif outside
security-level 0
ip address x.x.x.x 255.255.255.248
!
interface GigabitEthernet0/1
description To-HEX-SRX-02-ge-0/0/10
nameif inside
security-level 100
ip address x.x.x.x 255.255.255.252

 

ftp mode passive
object network The_Hub
host x.x.x.x
object network Console_Ext
host x.x.x.x
object network Console_Int
host x.x.x.x
object network Test_Int
host x.x.x.x
object-group icmp-type svc_ICMP_types_allowed
icmp-object echo
icmp-object echo-reply
icmp-object time-exceeded
icmp-object unreachable
access-list SPLIT_TUNNEL standard permit x.x.x.x255.255.255.0
access-list outside_to_inside extended permit ip object The_Hub object Console_Int
access-list inside_to_outside extended permit ip any4 any4
access-list inside_to_outside extended permit ip object Console_Ext object The_Hub
access-list natcap extended permit ip any4 host x.x.x.x
access-list insidecap extended permit ip host x.x.x.x any4
pager lines 50
mtu outside 1500

mtu inside 1500
no failover
no monitor-interface service-module
icmp unreachable rate-limit 1 burst-size 1
asdm image disk0:/asdm-791-151.bin
no asdm history enable
arp timeout 14400
no arp permit-nonconnected
arp rate-limit 16384
nat (outside,inside) source static The_Hub The_Hub destination static Console_Ext Console_Int
nat (inside,outside) source static Console_Int Console_Ext destination static The_Hub The_Hub
access-group outside_to_inside in interface outside
access-group inside_to_outside in interface inside
route outside 0.0.0.0 0.0.0.0 x.x.x.x
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
timeout conn-holddown 0:00:15
timeout igp stale-route 0:01:10
user-identity default-domain LOCAL
aaa authentication ssh console LOCAL
aaa authentication login-history
http server enable
http x.x.x.x 255.255.255.255 outside
http 0.0.0.0 0.0.0.0 inside
http redirect outside 80
no snmp-server location
no snmp-server contact
crypto ipsec security-association pmtu-aging infinite
crypto ca trustpool policy
crypto ikev1 enable inside
telnet timeout 5
ssh stricthostkeycheck
ssh x.x.x.x 255.255.255.255 outside
ssh x.x.x.x 255.255.255.255 outside
ssh x.x.x.x 255.255.255.255 outside
ssh 0.0.0.0 0.0.0.0 inside
ssh timeout 30
ssh version 2
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

anyconnect keep-installer installed
anyconnect dpd-interval client 30
anyconnect ask none default anyconnect
dynamic-access-policy-record DfltAccessPolicy

policy-map type inspect dns preset_dns_map
 parameters
  message-length maximum client auto
  message-length maximum 512
  no tcp-inspection
policy-map global_policy
 class inspection_default
  inspect dns preset_dns_map
  inspect ftp
  inspect h323 h225
  inspect h323 ras
  inspect ip-options
  inspect netbios
  inspect rsh
  inspect rtsp
  inspect skinny
  inspect esmtp
  inspect sqlnet
  inspect sunrpc
  inspect tftp
  inspect sip
  inspect xdmcp
!
service-policy global_policy global
prompt hostname context
no call-home reporting anonymous
call-home
 profile CiscoTAC-1
  no active
  destination address http https://tools.cisco.com/its/service/oddce/services/DDCEService
  destination address email callhome@cisco.com
  destination transport-method http
  subscribe-to-alert-group diagnostic
  subscribe-to-alert-group environment
  subscribe-to-alert-group inventory periodic monthly 23
  subscribe-to-alert-group configuration periodic monthly 23
  subscribe-to-alert-group telemetry periodic daily
Cryptochecksum:ef081ba9597dbf55affc7b83b34cffc4

 

Log files show as "Empty". Here is the "packet-tracer" readout:

packet-tracer input outside tcp x.x.x.x ssh x.x.x.x ssh detailed

 

Phase: 1
Type: CAPTURE
Subtype:
Result: ALLOW
Config:
Additional Information:
Forward Flow based lookup yields rule:
in id=0x2aaac85180a0, priority=13, domain=capture, deny=false
hits=353683, user_data=0x2aaac8fbfa50, cs_id=0x0, l3_type=0x0
src mac=0000.0000.0000, mask=0000.0000.0000
dst mac=0000.0000.0000, mask=0000.0000.0000
input_ifc=outside, output_ifc=any

Phase: 2
Type: ACCESS-LIST
Subtype:
Result: ALLOW
Config:
Implicit Rule
Additional Information:
Forward Flow based lookup yields rule:
in id=0x2aaac8498c90, priority=1, domain=permit, deny=false
hits=117935, user_data=0x0, cs_id=0x0, l3_type=0x8
src mac=0000.0000.0000, mask=0000.0000.0000
dst mac=0000.0000.0000, mask=0100.0000.0000
input_ifc=outside, output_ifc=any

Phase: 3
Type: ROUTE-LOOKUP
Subtype: Resolve Egress Interface
Result: ALLOW
Config:
Additional Information:
found next-hop x.x.x.x using egress ifc outside

Phase: 4
Type: ACCESS-LIST
Subtype:
Result: DROP
Config:
Implicit Rule
Additional Information:
Forward Flow based lookup yields rule:
in id=0x2aaac849c080, priority=111, domain=permit, deny=true
hits=50402, user_data=0x0, cs_id=0x0, flags=0x4000, protocol=0
src ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any
dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any, dscp=0x0
input_ifc=outside, output_ifc=outside

Result:
input-interface: outside
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

 

I can confirm that the packets are hitting the "outside" interface as when I complete a capture, they are all there. No packets appear on the inside interface capture. This is because they are hitting the implicit deny all from the packet tracer readout.

 

Any help would be greatly appreciated.

 

Thanks