PIX 525 access-list
I know it must be simple, however, I have some difficulty doing that work. I use version 5.3
I'm trying to block access to the internet at 172.16.39.X. whatever it is on this network should NOT be able to access the internet.
I use the list of access and access - group commands but I must have some syntax errors or something as there doesn't seem to be blocking access. Could someone provide a concrete syntax for this address with 255.255.255.0 subnet so I can see if perhaps I simply make a mistake in the entry. I am new to PIX so I wouldn't be really surprised.
Thank you
Dave
You can do this in several ways:
1. you can exclude this your NAT range. This will not allow this range out to the internet.
2. on your inside interface, apply this rule:
insideACL list access deny ip 172.16.39.0 255.255.255.0 any
insideACL ip access list allow a whole
I hope this helps.
Tags: Cisco Security
Similar Questions
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PIX Firewall 525 access list problem
Hello.
I have the following problem. After insertion of an access list, despite seeing the packages associated with the list, they do not "match", that is, it is as if the list wasn't doing his job.
Who can be the cause of this behavior?
PIX 525 model
IOS 6.3 (4)
Thank you.
Marulanda Ramiro Z.
Are all of syslogs sent properly to the remote host? If so, I would say that the udp connection is never closed by the PIX. Let's say that the connection never hit the timeout in the pix config. If the connection remains open and doesnot increments the hit count for your access list. I have a PIX that makes the same behavior.
The increase in the number of accesses is also based on the connection and not on each packet passing through the PIX.
You can use a debug command to see the packets through the PIX.
HTH
Mike
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How PIX cross access lists?
I'm new with PIX.
I would like to know how this fw through access lists. I mean, it's in what order it checks the rules. I guess it can be quite an important issue if you want to keep performance with more than 400 rules and a flow of traffic.
I thank the of for any comment.
Hello
the pix treats the ACL from top to bottom. Put the rules used most frequently at the top. After a match, the pix stop processing the ACL.
Kind regards
Tom
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I am facing convert statements leads on our PIX 520 access lists. Is there a better way to do this will be as little as possible traffic interruption? For example, to create access lists and then remove the conduit, or vice versa?
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Hello
This is a very good paper on the conversion of lines to the ACL, also when writing ACL always have your most important ACL on top of the ACL work from the top down. When you make changes to the ACL or static lines always issue the command clear xlate and save with RAM command.
http://www.giac.org/practical/GSEC/Bill_Donaldson_GSEC.pdf - by Bill Donaldson, GSEC.
If you want more information/inf, then let me know.
Thank you / Jay.
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How can I clear counters access-list on a pix firewall
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It would be clear access-list on a router counters.
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access list counters Clear
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access-list [line-num]
Too often, I see in the access list statement, there is a line number set to 1, like this:
permit access-list id_test 1...
Desc the doc said: "The line number to insert a note or an access control element (ACE)."
I can understand his 'writing' but never 'really' understand. :)
Someone could it explain by giving an example?
Thank you for helping.
Scott
PIX (config) # access-list id_test sh
id_test list of access; 5 elements
id_test of access list row 1 will allow any host 1.1.1.1 (hitcnt = 0)
id_test of access list row 2 allow accord any host 2.2.2.2 (hitcnt = 0)
id_test of access list row 3 will allow any host 3.3.3.3 (hitcnt = 0)
line 4 of the id_test of access list allow accord any host 4.4.4.4 (hitcnt = 0)
access list id_test line 5 will allow any host 5.5.5.5 (hitcnt = 0)
PIX (config) # access - list id_test line 2 Note Hello
PIX (config) # access-list id_test sh
id_test list of access; 5 elements
id_test of access list row 1 will allow any host 1.1.1.1 (hitcnt = 0)
Hello from note access-list id_test line 2
id_test of access list row 3 will allow any host 2.2.2.2 (hitcnt = 0)
line 4 of the id_test of access list allow accord any host 3.3.3.3 (hitcnt = 0)
access list id_test line 5 will allow any host 4.4.4.4 (hitcnt = 0)
id_test of access list line 6 will allow any host 5.5.5.5 (hitcnt = 0)
allowed for pix (config) # access - list id_test line 1 icmp any host 1.1.1.1
PIX (config) # access-list id_test sh
id_test list of access; 6 items
allowed to Access-list id_test line 1 icmp any host 1.1.1.1 (hitcnt = 0)
id_test of access list row 2 allow accord any host 1.1.1.1 (hitcnt = 0)
Note access-list id_test line 3 Hello
line 4 of the id_test of access list allow accord any host 2.2.2.2 (hitcnt = 0)
access list id_test line 5 will allow any host 3.3.3.3 (hitcnt = 0)
id_test of access list line 6 will allow any host 4.4.4.4 (hitcnt = 0)
access list id_test line 7 will allow any host 5.5.5.5 (hitcnt = 0)
TRIS-NOC-FW1 (config) #.
the golden rule of the acl, is that it works in order, from top to bottom. with the line number, you can precisely insert the new entry of acl or note everywhere where you want.
for example, imagine you have a 200-entry acl, and now you want to allow one host before the other refuse registration. of course you don't want to interrupt the network by UN-apply and reapply the entire acl. in this case, the line number to save life.
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Access list ID # on a PIX firewall
Is anyone know what of the identifier access list on a pix firewall?
Standard IOS = 1-99
Extended IOS is 100-199.
SW = PIX?
There is no "limit" by Word to say in the Pix. These limits are in IOS because they define what 'type' of acl, it's IE APPLETALK, IPX, IP etc etc. Pix IP is therefore not necessary for this type of identification.
access-list 100000000000000; 1 items
allow line of the access list 1 100000000000000 ip any a (hitcnt = 0)
Jason
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PIX 501 ICMP access list Question
According to the book, I have the pix and firewall that I know of dealing with routers and switches access lists define what traffic is allowed outside the network. With pix access lists can only be applied one way, to the interface they enter, not leaving. It's my understanding, but when I do an ICMP command:
PIX1 (config) # access - list ethernet1 permit icmp any any echo response
PIX1 (config) # access - list icmp permitted ethernet1 everything all inaccessible
Access-group ethernet1 PIX1 (config) # interface inside
This does not work, but if I apply the access group to the external interface it works. I understand why it is like that.
Thank you
This works because the pix is not aware of session state for the way icmp traffic that it does for tcp and udp.
By default, less access to a high to an interface is allowed, unless you have an acl applies to the interface of higer - then only what the acl permits will be allowed. So you can send outbound icmp echo request. However, for the response to be returned, you must allow that explicitly in an acl that is applied on the external interface, because the pix won't allow any outside traffic by default.
Even for icmp unreachable, although I want to put in custody to be part of the config. Allow only the unattainable due to the ttl expired to facilitate detection of mtu path, not all unachievable.
Let me know if it helps.
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Hello
We have a Cisco PIX 535. By default, traffic on one more secure interface with a lower security level is allowed, what is?
OK, I have a doubt, I had to define an access list entry to allow a telnet connection between inside and outside. There is no rule against that traffic, but without this rule the telnet connection cannot be established.
And my question is: why? It is not supposed to be allowed by default?
Thanks in advance.
Higher default-> bottom is allowed... However, once you add instructions permit, it is implicitly deny all at the end. So, if you allow ftp and ssl web... so by default, any other traffic is denied and you need to be precise with your permit.
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The following access list works on a cisco router, however, the list will not work on the PIX (I change the mask to wildcards to a for the PIX subnet mask).
Router (works)
access allowed test tcp 192.168.1.50 list 0.0.0.5 host 10.10.10.1 eq 80
PIX (does not work)
access list permit test tcp 192.168.1.50 0.0.0.10 host 10.10.10.1 eq 80
I get the error on the PIX:
ERROR: Source, mask <192.168.1.50, 0.0.0.10="">address not pair
Is it possible to group IP addresses as well as on the PIX in a similar way as Cisco IOS?
Thank you!
Domo Arigato!
You can use
192.168.1.48 255.255.255.248 for the source or if they are many hosts you must insert an individual entry for each source.
Of course you can refuse the host 192.168.1.49 and
Let the others allow 192.168.1.48 255.255.255.248
192.168.1.50,> -
New to pix, need help with "debug access list of all the" command
I have a pix 515 v6.3. I am tring to use then "debug access list of all the" command to see what traffic is stopped by my access list. However, I don't get any output. I turn execution of the command, but nothing happens. Other debug commands give the console. Perhaps, I do not understand what "debug to access list of all the" is used for. Any help that can be provided would be greatly appreciated.
Tim
Also try following the commands of logging
LOGG on
LOGG buff 7
term Lun
M.
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I have the access-list applied on my "external" my PIX interface and I'm trying to make it so pings coming from the 'inside' book, but those who come of the? outside? in case of failure.
access-list outside permit icmp any any echo response
list a whole outside access allowed icmp time-exceeded
access outside allowed icmp list everything all inaccessible
Using a VPN, you can create a rule/filter and apply it to the tunnel which verifies the established bit to be set. Is it possible to do this with a list of access a PIX?
I have a 6.3 (5) PIX 501
If you add (in config mode)
ICMP deny everything outside
The above will disable any ping/trace route or network scans of the internet (that is, your network will be in stealth mode), if you also add
access-list outside permit icmp any any echo response
list a whole outside access allowed icmp time-exceeded
access outside allowed icmp list everything all inaccessible
outside access-group in external interface
This will then allow icmp traffic going out to the internet, BUT don't be do not allow anyone to ping/trace route internet or analyze your network!
You can test this by visiting http://www.grc.com and using the program "shields up" to analyze your network. Try first without icmp deny out of any instruction and then with the statement added to your configuration.
Hope this helps
Jay
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Card crypto controls lock-up PIX 525
Does anyone know why my PIX 525 crashes when I apply my a cryptomap both command line? I first apply the following ACL. But when I try to apply the first line of cryptomap my PIX locks and I have to restart... Any help would be greatly appreciated >
permit access ip xx.xx.0.0 255.192.0.0 list XXXXXtunnel xx.xx.18.0 255.255.255.0
access-list allowed sheep xx.xx.0.0 xx.xx.xx.0 255.255.255.0 xx.xx.0.0 ip
allowed to access-list acl-inner ip xx.xx.0.0 xx.xx.0.0 xx.xx.xx.0 xx.xx.xx.0
xxx_map 157 ipsec-isakmp crypto map
card crypto xxx_map 157 correspondence address xxx-tunnel
card crypto xxx_map 157 counterpart set xx.4.xx.xx
card crypto xxx_map 157 transform-set xxx_set
Hello
I came across this problem when there are other entries already exist under the same crypto map, and are already applied to an interface.
I found that by denying first crypto map interface command, change the config and re - apply the interface command then it will work very well.
So...
(1) no xxx_map interface card crypto outside
(2) place the lines of crypto map configuration
(3) interface xxx_map crypto map out
Of course, you will lose the existing tunnels if some already set up but then this happens if you reboot anyway!
It may be useful
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Allowing ICMP and Telnet via a PIX 525
We are trying to build a new block of distribution to our backbone WAN. We are experiencing a problem when establishing ICMP and Telnet via the PIX. The following is known:
1 Ping and telnet to the 6509 and internal network works very well for the PIX.
2 Ping the 7206 for the PIX works just fine.
3 debug normal to see activity track ICMP for connections ICMP for the PIX of the network 6509 and internal; However, the debug shows nothing - no activity - during attempts to ping at a.b.5.18. (see below).
In short, all connections seem to be fine between the three devices, however, we can get ICMP and Telnet work correctly through the PIX.
The layout is:
6509 (MSFC) - PIX 525-7206
IP:a.b.5.1 - a.b.5.2 a.b.5.17 - a.b.5.18
255.255.255.0 255.255.255.240 255.255.255.240
(both)
networks: a.b.5.0 a.b.5.16
255.255.255.240 255.255.255.240
6509:
interface VlanX
Description newwan-bb
IP address a.b.5.1 255.255.255.0
no ip redirection
router ospf
Log-adjacency-changes
redistribute static subnets metric 50 metric-type 1
passive-interface default
no passive-interface Vlan9
((other networks omitted))
network a.b.5.0 0.0.0.255 area 0
default information are created
PIX 525:
ethernet0 nameif outside security0
nameif ethernet1 inside the security100
nameif ethernet2 security10 failover
hostname XXXXXX
domain XXX.com
fixup protocol ftp 21
fixup protocol http 80
fixup protocol h323 1720
fixup protocol rsh 514
fixup protocol rtsp 554
fixup protocol smtp 25
fixup protocol sqlnet 1521
fixup protocol sip 5060
fixup protocol 2000 skinny
names of
access ip-list 102 permit a whole
access-list 102 permit icmp any one
access-list 102 permit icmp any any echo
access-list 102 permit icmp any any echo response
access-list 102 permit icmp any any source-quench
access-list 102 permit everything all unreachable icmp
access-list 102 permit icmp any one time exceed
103 ip access list allow a whole
access-list 103 allow icmp a whole
access-list 103 permit icmp any any echo
access-list 103 permit icmp any any echo response
access-list 103 permit icmp any any source-quench
access-list 103 allow all unreachable icmp
access-list 103 allow icmp all once exceed
pager lines 24
opening of session
timestamp of the record
logging buffered stored notifications
interface ethernet0 100full
interface ethernet1 100full
interface ethernet2 100full
Outside 1500 MTU
Within 1500 MTU
failover of MTU 1500
IP address outside a.b.5.17 255.255.255.240
IP address inside a.b.5.2 255.255.255.240
failover from IP 192.168.230.1 255.255.255.252
alarm action IP verification of information
alarm action attack IP audit
history of PDM activate
ARP timeout 14400
Global 1 interface (outside)
NAT (inside) 1 0.0.0.0 0.0.0.0 0 0
Access-group 103 in external interface
Route outside 0.0.0.0 0.0.0.0 a.b.5.18 1
Route inside a.0.0.0 255.0.0.0 a.b.5.1 1
Inside a.b.0.0 255.240.0.0 route a.b.5.1 1
Timeout xlate 03:00
Timeout conn 01:00 half-closed 0: 10:00 udp 0:02:00 CPP 0: h323 from 10:00 0:05:00 sip 0:30:00 sip_media 0:02:00
Timeout, uauth 0:05:00 absolute
GANYMEDE + Protocol Ganymede + AAA-server
RADIUS Protocol RADIUS AAA server
No snmp server location
No snmp Server contact
SNMP-Server Community public
No trap to activate snmp Server
enable floodguard
No sysopt route dnat
Telnet a.0.0.0 255.0.0.0 outdoors
Telnet a.0.0.0 255.0.0.0 inside
Telnet a.b.0.0 255.240.0.0 inside
Telnet a.b.5.18 255.255.255.255 inside
Telnet timeout 5
SSH timeout 5
Terminal width 80
Recognizing any help on proper routing through a PIX 525, given that all this is for a network internal.
on the 6509, why the int has a 24 subnet mask, when everything has a 28? If you try the 6500 ping.18, he thinks that it is on a local network, and there no need to route through the pix
Your access lists are confusing.
access-list # ip allowed any one should let through, and so everything that follows are redundant statements.
for the test,.
alloweverything ip access list allow a whole
Access-group alloweverything in interface outside
should the pix act as a router - you are effectively disabling all firewall features.
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Hello
I have a PIX 525 to my main site and a 1721 router at a remote location. I used the PDM and the SDM to configure site-to-site IPSec VPN connection. In my private network, I use 10.1.0.0/16 for the main site and 10.x.0.0/16 (where x = 2-47) to remote sites.
The remote site with the VPN connection uses 10.19.0.0/16. When I originally created this VPN, I configured the traffic to flow from the remote site to 10.1.0.0/16 only. This means that the remote site cannot speak to any other remote sites, just the main site.
I need to modify the access list to solve this problem. The relevant part of the remote site access list is now:
access-list 103 allow ip 10.1.0.0 0.0.255.255 10.19.0.0 0.0.255.255
access-list 103 deny ip 10.19.0.0 0.0.255.255 everything
Can I change the subnet mask in the first line and put the second line first?
access-list 103 deny ip 10.19.0.0 0.0.255.255 everything
access-list 103 allow ip 10.0.0.0 0.255.255.255 10.19.0.0 0.0.255.255
Or should I let the deny at the end statement, and add a line for each of the other remote sites:
access-list 103 allow ip 10.1.0.0 0.0.255.255 10.19.0.0 0.0.255.255
access-list 103 allow ip 10.2.0.0 0.0.255.255 10.19.0.0 0.0.255.255
access-list 103 allow ip 10.3.0.0 0.0.255.255 10.19.0.0 0.0.255.255
access-list 103 allow ip 10.4.0.0 0.0.255.255 10.19.0.0 0.0.255.255
... (others)
access-list 103 deny ip 10.19.0.0 0.0.255.255 everything
Thank you.
John
John
Help the additional configuration information that you have posted. There are still a few things which I hope could be clarified. It seems that you have 46 remote sites and only is connected via a VPN. How have the other connectivity? It is all over the links within your private network? Is there than any NAT involved in these other connections?
In my previous answer, I assumed that there will be multiple VPN connections, revealing your additional information is not the case. So my comment about limitations in PIX for talk of talks is true but not applicable to your situation.
Other remote sites are also coming via the VPN? If yes access list 100 which the 1721 uses to identify the IPSec traffic (and that was not in your posted material) will probably have to be changed.
According to access list 103 is concerned, I guess that the deny ip 10.19.0.0 0.0.255.255 is an anti-spoofing measure? If so, I would probably advocate put it as the first entry in the access list. What about if you want to use ip 10.0.0.0 allow 0.255.255.255 10.19.0.0 0.0.255.255 or a series of individual licenses, according to me, a point to consider is that allowed 10.0.0.0 0.255.255.255 will allow any space of 10 addresses. It seems that you use 1 to 47. What happens if something came through 10.122.x.x? I suggest a compromise approach. You can use this:
IP 10.0.0.0 allow 0.31.255.255 10.19.0.0 0.0.255.255
ip licensing 10.32.0.0 0.15.255.255 10.19.0.0 0.0.255.255
This would allow 1 to 47 but not others.
HTH
Rick
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