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Cisco PIX 501 - Port Forwarding

Posted on 2008-06-09
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Last Modified: 2012-05-05
Hi All,

I need to add port forwarding to the Cisco Pix Config below without stopping it from being able to connect the VPN to the centralpix (which is currently working ok). I have had a go at this myself but am not a Cisco expert and couldn't seem to get it working without breaking the VPN connection.

Thanks in advance!

Peter
interface ethernet0 10baset
interface ethernet1 100full
nameif ethernet0 outside security0
nameif ethernet1 inside security100
 
enable password myPassword
passwd MyPassword
 
hostname MyHostName
clock timezone gmt 10
 
fixup protocol dns maximum-length 512
fixup protocol ftp 21
fixup protocol h323 h225 1720
fixup protocol h323 ras 1718-1719
fixup protocol http 80
fixup protocol ils 389
fixup protocol pptp 1723
fixup protocol rsh 514
fixup protocol rtsp 554
fixup protocol sip 5060
fixup protocol sip udp 5060
fixup protocol skinny 2000
fixup protocol smtp 25
fixup protocol sqlnet 1521                          
fixup protocol tftp 69
 
names
name 5.5.5.5 centralpix
name 192.168.254.1 router
name 192.168.254.2 pixoutside
name 192.168.1.1 pixinside
 
access-list 110 permit ip 192.168.1.0 255.255.255.0 192.168.2.0 255.255.255.0
access-list acl_out permit icmp any any time-exceeded
access-list acl_out permit icmp any any unreachable
access-list acl_out permit icmp any any echo-reply
 
pager lines 24
mtu outside 1500
mtu inside 1500
ip address outside pixoutside 255.255.255.0
ip address inside pixinside 255.255.255.0
ip audit info action alarm
ip audit attack action alarm
pdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 0 access-list 110
nat (inside) 1 0.0.0.0 0.0.0.0 0 0
access-group acl_out in interface outside
route outside 0.0.0.0 0.0.0.0 router 1                                      
 
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 rpc 0:10:00 h225 1:00:00
timeout h323 0:05:00 mgcp 0:05:00 sip 0:30:00 sip_media 0:02:00
timeout sip-disconnect 0:02:00 sip-invite 0:03:00
timeout uauth 0:05:00 absolute
 
aaa-server TACACS+ protocol tacacs+
aaa-server TACACS+ max-failed-attempts 3
aaa-server TACACS+ deadtime 10
aaa-server RADIUS protocol radius
aaa-server RADIUS max-failed-attempts 3
aaa-server RADIUS deadtime 10
aaa-server LOCAL protocol local
 
ntp server 131.107.1.10 source outside
ntp server 192.189.54.33 source outside
 
http server enable
http 0.0.0.0 0.0.0.0 inside
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
floodguard enable
 
sysopt connection permit-ipsec                              
crypto ipsec transform-set akemat esp-3des esp-sha-hmac
crypto map newmap 20 ipsec-isakmp
crypto map newmap 20 match address 110
crypto map newmap 20 set peer centralpix
crypto map newmap 20 set transform-set akemat
crypto map newmap interface outside
 
isakmp enable outside
isakmp key MyPassword address centralpix netmask 255.255.255.255
isakmp keepalive 180 60
isakmp policy 20 authentication pre-share
isakmp policy 20 encryption 3des
isakmp policy 20 hash sha
isakmp policy 20 group 1
isakmp policy 20 lifetime 1000
 
telnet 192.168.1.0 255.255.255.0 inside
telnet 0.0.0.0 0.0.0.0 inside
telnet timeout 10
 
management-access inside
console timeout 0
dhcpd address 192.168.1.60-192.168.1.91 inside
dhcpd dns 139.130.4.4 203.50.2.71
dhcpd lease 604800
dhcpd ping_timeout 750
dhcpd enable inside
terminal width 80

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Question by:PeteJH
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6 Comments
 

Author Comment

by:PeteJH
ID: 21748018
I forgot to mention that the port fowards I need configured are TCP 25, 443 and 4125 to be forwarded to the internal host 192.168.1.2.

Also, the client has a standard DSL modem on the outside of the PIX (192.168.254.1) in routing mode. We just set up the DMZ setting to forward all traffic to the PIX. There is a single static IP on the DSL connection.

Cheers
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LVL 32

Accepted Solution

by:
rsivanandan earned 500 total points
ID: 21748573
I'm going to assume that everything that hits your public ip on the dsl modem is converted (natted back) to your pixoutside ip address, then this is what you need;

static (inside,outside) tcp interface 25 192.168.1.2 25
static (inside,outside) tcp interface 443 192.168.1.2 443
static (inside,outside) tcp interface 4125 192.168.1.2 4125

access-list OutsideIn permit any interface outside eq 25
access-list OutsideIn permit any interface outside eq 443
access-list OutsideIn permit any interface outside eq 4125

access-group OutsideIn in interface outside

Cheers,
Rajesh
0
 
LVL 57

Expert Comment

by:Pete Long
ID: 21749324
Rajesh is spot on as usuall :)
heres some extra reading http://www.petenetlive.com/Tech/Firewalls/Cisco/portforward.htm
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Author Comment

by:PeteJH
ID: 21756276
Thanks Rajesh. You saved me a stack of time and it is most appreciated.

Just a note, I seemed to have to add "tcp" into the following lines to get it to work:

access-list OutsideIn permit tcp any interface outside eq 25
access-list OutsideIn permit tcp any interface outside eq 443
access-list OutsideIn permit tcp any interface outside eq 4125

Thanks again!
0
 
LVL 32

Expert Comment

by:rsivanandan
ID: 21756666
Oh yeah, typo (Haven't worked on a Cisco gear for last 2 years - excuse me :-) )

Cheers,
Rajesh
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Author Comment

by:PeteJH
ID: 21790191
No dramas and thanks again Rajesh!
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