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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Located outside the pix firewall.
My inner Server works fine, able to go Internet and able to comminicate with all devices located outside the Pix Firewall. Here is reference configuration
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If I create a static entry for your DMZ SNMP server.
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He starts to communicate with external devices, but stops Internet run on this server. same configuration
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Standard IOS = 1-99
Extended IOS is 100-199.
SW = PIX?
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Jason
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Hello
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The error given below,
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downgrade tftp://tftpserverip/pix63x.bin
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http://www.Cisco.com/en/us/docs/security/ASA/asa70/pix_upgrade/upgrade/guide/pixupgrd.html#wp1810347
in any case, you can always redownload the 6.3.5 new code in monitor mode.
Let us know how it works.
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Jorge
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http://www.Cisco.com/en/us/Tech/tk583/TK372/technologies_tech_note09186a00801e419a.shtml
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Hello.
My question is this.
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To be like that, where I can find documentation on the matter?
Thanks in advance.
Dear.
Both Sonicwall conforms to standards, which they do, then Yes, you can create a VPN between them.
I don't think we have PIX, Sonicwall example config specifically, but the config on the PIX is still pretty standard, no matter what you connect to.
SonicWALL has an example here: ftp://ftp.sonicwall.com/pub/info/vpn/CiscoPIX.pdf
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How to limit the ICMP on the PIX firewall.
Guys good day!
I have a dilemma with regard to limiting ICMP users browsing to other networks such as other demilitarized interns.
I know that, to allow ICMP to pass through interfaces, you will need to create an ACL such as below:
access-list DMZACL allow icmp a whole
Users require this config ping a server on the DMZ, but it is a security risk.
To minimize, I have a group of objects created in order to identify hosts and networks is allowed to have access to the echo-replies.
Again, this is a problem since many host who extended pings just to monitor the connectivity server and its application.
Do you have other ideas guys?
As to limiting the echo answers on the PIX. As first 5 echo request succeed with 5 echo-replies and the rest would be removed.
This could be done?
Thank you
Chris
Hello.. I don't think you can do this by using an ACL on the PIX, however, you might be able to stop the ICMP sweeps by activating CODES signatures using the check ip command you... For more information see the link below
Guidelines of use Cisco Intrusion Detection System (IDS Cisco) provides the following for IP-based systems:
? Audit of traffic. The application of signatures will be audited only as part of an active session.
? Apply to the verification of an interface.
? Supports different auditing policies. Traffic that matches a signature triggers a range of configurable
actions.
? Disables signature verification.
? Always turns the shares of a class of signature and allows IDS (information, attack).
The audit is performed by looking at IP packets to their arrival at an input interface, if a packet triggers
a signature and the action configured does not have the package, and then the same package may trigger another
signatures.
Firewall PIX supports inbound and outbound audit.
For a complete list signatures of Cisco IDS supported, their wording and whether they are attacking or
informational messages, see Messages in Log System Cisco PIX Firewall.
See the User Guide for the Cisco Secure Intrusion Detection System Version 2.2.1 for more information
on each signature. You can view the? NSDB and Signatures? Chapter of this guide at the following
website:
http://www.Cisco.com/univercd/CC/TD/doc/product/iaabu/csids/csids1/csidsug/SIGs.htm
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Place a server behind a PIX firewall production
Hi all
We currently have a web server that is connected to the Internet directly (multiple addressable IPs belonging to 5 different ranges of class C, with a soft firewall).
There are several Web sites, some of them with their own IP addresses, some of them sharing IPs with other sites.
We intend to put a server behind a PIX firewall and convert addressable IP addresses to private IPs with the static mapping on the PIX.
We plan use a PIX with two (2) interfaces.
You think it of feasible or are there things that I'm on?
Some things I'm not sure about:
Since there are several C class IPs assigned to the server and therefore 5 gateways defined on a NIC, one for each class, how that is defined on the PIX? 5 separate roads or...?
We need to use a kind of "virtual interfaces", one for each class C subnet?
This is an example of a "final product":
Web request to the 204.xxx.85.10 IP addressable would be directed to the private IP address: 10.xxx.85.10.
Web request to the 204.xxx.86.10 IP addressable would go to 10.xxx.86.10 etc etc.
Any help you could provide in this regard will be GREATLY apprechiated!
Hello
Please provide a topology (plain text would work). I can't tell from your description, if you have a perimeter router in front of the Pix. In addition, when you write statements of static road on the Pix, you must include an interface as follows
Route if_name IPAddress netmask gateway_ip
Once you post this information, I'll take another reading to better understand your situation.
Thank you
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When I do a command 'See logging' in my Cisco Pix Firewall (6.3), I am able to see the message below
605005: x.x.x.x/33652 for eth1:y.y.y.y/telnet for the user authorized login «»
In the message above, why the user name is not printed?
your config has.
Console telnet AAA authentication GANYMEDE + | RAY | LOCAL '?
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Hi guys, I noticed that there is a document on the setting of the Cisco routers on cisco.com
Is there than a best practices similar document type for Secure PIX firewall? or even a general firewall best practices guides?
I searched, but did not really find anything. Any help would be great!
Hi Nathan,
So far, there is no specific doc, but you can get the idea of documentation PIX / ASA itself. This is probably due to the nature 'trust' of the firewall itself (everybody knows that it was not 100% sure).
Anyway, there is a document on "Best practices of firewall" at http://www.principlelogic.com.
Others are:
http://www.Security.FSU.edu/firewall.cfm
http://SearchSecurity.TechTarget.com/originalContent/0, 289142, sid14_gci838230, 00.html
Personally, I think the recommendations are very good and can be applied generally to fix most of the firewall products.
I hope this helps.
Rgds,
AK
WARNING: -.
The post above is not intended to promote the services/tools/products on behalf of a person or organizations. This is simply about & information sharing.
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Remote Desktop from Win7 not passing is not by the cisco pix firewall, but xp can.
our company lan remote office work like this:
Win7 for win7 ok
Win7 for xp ok
XP and win7 ok
XP to xp ok
Which leads me to believe that all the parameters and features of firewall and rdp pc work fine.
our remote users connect via the cisco through our cisco pix vpn client business and Remote Desktop works like this:
inside lan xp ouside xp OK
inside lan xp ouside win7 OK
Here's the problem:
inside to outside win7 win7 ==> does NOT connect to (rdp that is)
inside win7 for xp outdoor ==> does NOT connect to (rdp that is)
External clients CAN of course accept rdp because it works when initiated by the xp machine.
ONLY win7 machines cannot use rdp through the cisco firewall
Yes, the dns resolves properly throughout.
Yes, remote desktop IS active (Yes, some may ask me that...)
Ping is not allowed through the firewall, so it makes no difference.
the result is the same whether the win7 firewall is on or off.
all the necessary pc firewall settings are good, as demonstrated in the first part.
Why can you connect the NO Win7? but the XP machines?
Any help is appreciated, thanks.
I think that there are some weird setting in Win7 that didn't exist in winxp.
Hello
The question is more suited in the TechNet forums. So I would say you mention the link and send the request in this forum for better support.
http://social.technet.Microsoft.com/forums/en-us/category/w7itpro
For any information related to Windows, feel free to get back to us. We will be happy to help you.
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