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Accessing an internal resource from the Internet

anowell
Level 1
Level 1

I want to allow users from the Internet to access a web server on my private network. I am PAT'ing all my inside users to my public IP for outbound connectivity. In a PIX I know I must allow the outside user through the "outside" access-list and create a static NAT statement. Other than using a route-map is there another way to map a user from the Internet to an internal server?

Thanks in advance!

4 Replies 4

Richard Burts
Hall of Fame
Hall of Fame

Anthony

I am not clear from your question whether you do have a PIX or are just comparing your situation with what you know you need to do on a PIX. Can you clarify?

As you recognize, when you want to allow users from the Internet to access a server inside your network you need to have a consistent translation of the internal address to some externally reachable address. Static NAT is usually the solution. It gets tricky when you are using PAT.

HTH

Rick

HTH

Rick

Rick,

Thanks for the quick reply!

I failed to mention that I am using an 831 router. I will upload my config.

Thanks again!

+++++++++ MY CONFIG ++++++++

831#sh run

Building configuration...

Current configuration : 2884 bytes

!

! Last configuration change at 10:31:08 EDT Tue Aug 29 2006

! NVRAM config last updated at 17:11:02 EDT Mon Aug 28 2006

!

version 12.2

service nagle

no service pad

service tcp-keepalives-in

service tcp-keepalives-out

service timestamps debug datetime

service timestamps log datetime msec

service password-encryption

!

hostname 831

!

logging buffered warnings

enable secret 5

!

clock timezone EST -5

clock summer-time EDT recurring

ip subnet-zero

no ip source-route

no ip domain lookup

ip dhcp excluded-address 10.10.10.1

!

ip dhcp pool CLIENT

import all

network 10.10.10.0 255.255.255.0

default-router 10.10.10.1

dns-server 212.x.5.x

lease 0 2

!

ip cef

ip inspect name SDM_LOW cuseeme

ip inspect name SDM_LOW ftp

ip inspect name SDM_LOW h323

ip inspect name SDM_LOW netshow

ip inspect name SDM_LOW rcmd

ip inspect name SDM_LOW realaudio

ip inspect name SDM_LOW rtsp

ip inspect name SDM_LOW sqlnet

ip inspect name SDM_LOW streamworks

ip inspect name SDM_LOW tftp

ip inspect name SDM_LOW tcp

ip inspect name SDM_LOW udp

ip inspect name SDM_LOW vdolive

ip audit notify log

ip audit po max-events 100

!

!

!

!

interface Ethernet0

description $FW_INSIDE$

ip address 10.10.10.1 255.255.255.0

ip nat inside

no cdp enable

hold-queue 32 in

hold-queue 100 out

!

interface Ethernet1

description $FW_OUTSIDE$

ip address dhcp

ip access-group 103 in

ip nat outside

ip inspect SDM_LOW out

!

ip nat inside source route-map SDM_RMAP_1 interface Ethernet1 overload

ip classless

no ip http server

!

!

access-list 1 permit 166.7.9.112

access-list 1 permit 10.10.10.0 0.0.0.255

access-list 102 permit ip 10.10.10.0 0.0.0.255 any

access-list 103 remark SDM_ACL Category=1

access-list 103 permit udp any any eq bootpc

access-list 103 permit gre host 6.166.18.194 any

access-list 103 permit udp host 26.17.95.122 any eq tftp

access-list 103 permit tcp host 26.17.95.122 any eq telnet

access-list 103 permit udp host 26.17.95.122 any eq ntp

access-list 103 deny ip 10.0.0.0 0.255.255.255 any

access-list 103 deny ip 172.16.0.0 0.15.255.255 any

access-list 103 deny ip 192.168.0.0 0.0.255.255 any

access-list 103 deny ip 127.0.0.0 0.255.255.255 any

access-list 103 deny ip host 255.255.255.255 any

access-list 103 deny ip host 0.0.0.0 any

access-list 103 deny ip any any log

route-map SDM_RMAP_1 permit 1

match ip address 102

!

banner login ^C

This device is private property. Unauthorized access is not permitted. If you are unauthorized to access this device, you MUST disconnect immediately. All access to this device is logged. ^C

!

line con 0

password 7

no modem enable

stopbits 1

line aux 0

stopbits 1

line vty 0 4

access-class 1 in

exec-timeout 120 0

password 7

login

length 0

!

scheduler max-task-time 5000

sntp server 132.163.4.101

end

Anthony,

What ports do you want to forward from the internal IP ?

EDIT:

I read the original post and I see you have a webserver.

This IP NAT statement should take care of the HTTP requests.

ip nat inside source static tcp [webserverIP] 80 interface Ethernet1 80

You will also need to allow port 80 on ACL 103 for that webserver