As a transparent (bypass) PIX firewall?

I'm doing a school project that involves the use of a firewall PIX between the ISP and the edge of the network router. The goal is to make the network as secure as possible using only the PIX. Ideally, I'd like that it if an attacker could not even see the PIX was there. It made me think if the PIX can act as a transparent firewall, otherwise said, not having all the IPS assigned to the interfaces nor do no routing, simply inspect/forward traffic between inside/outside interface. Otherwise, I'll have to create a small 30 between the ISP and the PIX from the outside, and the border router and the route PIX inside and between them.

If I do the latter, can you give me advice on how to secure more PIX? Here is my config:

interface ethernet0 10full

interface ethernet1 100full

ethernet0 nameif outside security0

nameif ethernet1 inside the security100

activate the password encrypted x

passwd encrypted x

pixfirewall hostname

domain pix.local

fixup protocol dns-length maximum 512

No fixup protocol ftp 21

fixup protocol h323 h225 1720

fixup protocol h323 ras 1718-1719

fixup protocol http 80

fixup protocol rsh 514

fixup protocol rtsp 554

fixup protocol sip 5060

fixup protocol sip udp 5060

fixup protocol 2000 skinny

fixup protocol smtp 25

fixup protocol sqlnet 1521

fixup protocol tftp 69

names of

access-list 100 permit icmp any any echo response

pager lines 24

Outside 1500 MTU

Within 1500 MTU

IP 10.0.0.1 address outside 255.255.255.252

IP address inside 10.0.0.5 255.255.255.252

IP verify reverse path to the outside interface

IP verify reverse path inside interface

IP audit name AttackPolicy attack action alarm down reset

IP audit name InfoPolicy info action alarm down reset

verification of IP outside the InfoPolicy interface

interface IP outside the AttackPolicy check

verification of IP within the InfoPolicy interface

verification of IP within the AttackPolicy interface

disable signing verification IP 2000

disable signing verification IP 2004

don't allow no history of pdm

ARP timeout 14400

NAT (inside) 0 0.0.0.0 0.0.0.0 0 0

Access-group 100 in external interface

Route outside 0.0.0.0 0.0.0.0 10.0.0.2 1

Timeout xlate 03:00

Timeout conn 01:00 half-closed 0:10:00 udp 0: CPP 02:00 0:10:00 01:00 h225

H323 timeout 0:05:00 mgcp 0: sip from 05:00 0:30:00 sip_media 0:02:00

Timeout, uauth 0:05:00 absolute

GANYMEDE + Protocol Ganymede + AAA-server

RADIUS Protocol RADIUS AAA server

AAA-server local LOCAL Protocol

No snmp server location

No snmp Server contact

SNMP-Server Community public

No trap to activate snmp Server

enable floodguard

Telnet timeout 5

SSH timeout 5

Console timeout 5

Terminal width 80

Any help is appreciated! Thank you!

Chris

The PIX can now act as a layer 2 firewall, this feature will be in the next major version of the code should be out later this year. For now you will need a small subnet between the ISP and the PIX.

If you do not want to see the PIX then the first thing is to make sure it does not meet the pings. Use the "icmp" command (http://www.cisco.com/univercd/cc/td/doc/product/iaabu/pix/pix_sw/v_63/cmdref/gl.htm#wp1026574) for. Make sure you allow ICMP unreachable to the outside interface well and Path MTU Discovery can work properly (http://www.cisco.com/warp/public/105/38.shtml#pmtud_fail).

Other than that, it seems very good, pretty standard.

Tags: Cisco Security

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