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ssh port forwarding

gary.grobe
Level 1
Level 1

I'm trying to forward SSH from the outside to a specific server behind this ASA 5505 config. Can anyone lend a hand here.

ASA Version 7.2(4)
!
hostname ciscoasa
enable password !HgPTxF8112Bdb encrypted
passwd JuJ07h/lZ9f52tj1 encrypted
names
!
interface Vlan1
nameif inside
security-level 100
ip address 192.168.1.1 255.255.255.0
!
interface Vlan2
nameif outside
security-level 0
ip address <MY_IP> 255.255.255.0
!
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
!
ftp mode passive
access-list access_outside_in extended permit tcp any any range 27350 27483
access-list access_outside_in extended permit tcp any any range 28350 28483
pager lines 24
logging asdm informational
mtu inside 1500
mtu outside 1500
icmp unreachable rate-limit 1 burst-size 1
no asdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 1 0.0.0.0 0.0.0.0
static (inside,outside) tcp interface ssh 192.168.1.10 ssh netmask 255.255.255.255
route outside 0.0.0.0 0.0.0.0 <MY_GATEWAY.1.1>
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
http server enable
http 192.168.1.0 255.255.255.0 inside
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
telnet timeout 5
ssh scopy enable
ssh 192.168.1.0 255.255.255.0 inside
ssh timeout 5
console timeout 0
dhcpd auto_config outside
!
dhcpd address 192.168.1.2-192.168.1.254 inside
dhcpd enable inside
!

!
class-map inspection_default
match default-inspection-traffic
!
!
policy-map type inspect dns preset_dns_map
parameters
  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
!
service-policy global_policy global
prompt hostname context
Cryptochecksum:00cd56e103e324f289d79befce96b903

3 Replies 3

Hi,

The static NAT statement is correct:

static (inside,outside) tcp interface ssh 192.168.1.10 ssh netmask 255.255.255.255

But you're required to permit the traffic:

access-list access_outside_in extended permit tcp any interface eq 22

Federico.

Hi

As an Aside note, you wont be able to ssh to the Unit from the outside anymore.

Cheers

Mike

Mike

Collin Clark
VIP Alumni
VIP Alumni

You need to add SSH to your ACL.

access-list access_outside_in extended permit tcp host x.x.x.x host y.y.y.y eq 22

Than apply the ACL to your outside interface

access-group access_outside_in in interface outside

Also note that you will lose the ability to ssh to the ASA from the outside.

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