Question

PIX Firewall

Asked by: stamkoz

I am not familiar with PIX firewalls.
My network is like:

Internal_Network >>>(internal) PIX (external) >>> router (www, mail)
The internal address of the PIX is 10.10.10.2
The external address of the PIX is 200.200.200.2

I need to permit all internal traffic going to the web and deny all traffic coming from the web.

What acls do I need?

Thanks,

Stuart

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Asked On
2003-05-08 at 05:46:07ID20609836
Topics

Miscellaneous Security

,

Consumer Firewalls

,

Cisco PIX Firewall

Participating Experts
4
Points
125
Comments
8

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Answers

 

by: esmogenPosted on 2003-05-08 at 06:26:19ID: 8488356

Deny all incoming and allow all outgoing is default on PIX.

 

by: MikeKanePosted on 2003-05-08 at 07:43:51ID: 8489022

There's a great config guide at
http://www.cisco.com/univercd/cc/td/doc/product/iaabu/pix/pix_60/config/config.html

Here's a very simple sample setup

I made some assumptions on your ip's.  Be sure you understand what's happening with the config.  



nameif ethernet0 outside security0
nameif ethernet1 inside security100
interface ethernet0 10baset
interface ethernet1 10baset
ip address outside 200.200.200.2 255.255.255.0
ip address inside 10.10.10.2 255.255.255.0
arp timeout 14400
nat (inside) 1 0 0
global (outside) 1 200.200.200.10-200.200.200.30
global (outside) 1 200.200.200.31
no rip inside default
no rip inside passive
no rip outside default
no rip outside passive
route outside 0.0.0.0 0.0.0.0 200.200.200.1 1
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00
udp 0:02:00 rpc 0:10:00 h323 0:05:00
sip 0:30:00 sip_media 0:02:00
timeout uauth 0:05:00 absolute
access-list acl_grp permit icmp any any
access-group acl_grp in interface outside
no snmp-server location
no snmp-server contact
snmp-server community public
mtu outside 1500
mtu inside 1500


 

by: ckkePosted on 2003-05-09 at 20:25:39ID: 8498413

You can simply apply 2 acls on different interface.
Actually by default, PIX will deny all types of packets going in from outside to your network. So, you need to add the rule on the outside_acl to allow specific traffic to go thru.

Pix Config:

access-group outside_acl in interface outside
access-group inside_acl in interface inside

(allow echo reply from outside to your inside network)
access-list outside_acl permit icmp any any echo-reply
access-list outside_acl permit icmp any any unreachable
access-list outside_acl permit icmp any any time-exceeded

access-list inside_acl permit any any

 

by: stamkozPosted on 2003-05-11 at 23:05:33ID: 8506941

Thanks guys. It is working.

 

by: scott_rentonPosted on 2003-05-13 at 04:30:45ID: 8515733

Small comment:  If you're unfamiliar with the PIX and the config via command line, the 6.0 version of the software has a GUI/Java setup that's easier for the newer user.  I believe that you can point a web browswer to the internal address of the PIX to see it.  Double check the Cisco web site forst tho, on how to do that exactly, and what software is needed.

20120131-EE-VQP-002

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