ssh port forwarding

gary.grobe — Mon, 11 Mar 2019 19:40:12 GMT

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

Re: ssh port forwarding

Federico Coto Fajardo — Wed, 26 Jan 2011 17:25:09 GMT

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.

Re: ssh port forwarding

Maykol Rojas — Wed, 26 Jan 2011 17:26:20 GMT

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

Cheers

Mike

Re: ssh port forwarding

Collin Clark — Wed, 26 Jan 2011 17:26:54 GMT

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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