Access list in a PIX?

Similar Questions

• How can I clear counters access-list on a pix firewall

  How can I erase the hitcounts on an on a pix firewall access list without resetting the pix?

  It would be clear access-list on a router counters.

  Thanks in advance

  Steve

  access list counters Clear

• 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

• 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

• Pix access lists

  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?

  Second, is there a priority recommended in order to access list?

  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.

• 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.

• PIX 535 and access lists

  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.

• 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.

• Question of Access-list PIX

  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

• 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.

• 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

• (Update) Turbo access lists

  Hi all

  Can someone tell me how to compiled access lists make the decision on how they segment lists access in first level lookup tables

  I'm not looking for a doctoral thesis on how it works, but a general outline of how it decides and compiles.

  concerning

  Scott

  Scott,

  OK, c is always a foot 10 000 discovered here by reading the specifications made my brain hurt ;)

  Essentially, what we do with Turbo ACL, is we take the internal game of access lists and build a set of data tables. Each ACE in the ACL Gets a value of 'index' are entrusted to him. This index value is calculated according to an algorithm that looks at the IP address source IP dest, Protocol, port L4, etc... When a package arrives in a PIX which configured ACL turbo, this same 'indexing' occurs and a value is determined. We then use this value which is calculated for the new package and compare it to the assigned values to the individual ACE in the data tables to find the ACE the new package to match and then to process packets accordingly.

  This process of looking turned out be MUCH faster than the linear search standard, together with a linked list (normal) ACL.

  In any case, it's more or less the bottom of it. Hope this helps to enlighten us.

  Scott

• problem of access lists

  Hello, I have a problem with PIX Firewall Version 6.0 (1), the problem is:

  I have a pix with interface 3 inside, outside and dmz.

  IP address outside x.x.x.2 255.255.255.248

  IP address inside 200.115.10.10 255.255.255.0

  192.168.6.28 dmz IP address 255.255.255.0

  I need to make an acl where only 3 PC inside access server installed in the demilitarized zone, with a public ip, but the LCD is not working.

  Here is the ACL, but I change the IP addresses.

  access-list 108 allow ip 200.115.10.0 255.255.255.0 172.16.1.0 255.255.255.0

  access-list 108 allow ip 200.115.10.0 255.255.255.0 200.105.10.0 255.255.255.0

  access-list 108 allow ip 200.115.10.0 255.255.255.0 200.105.20.0 255.255.255.0

  access-list 108 allow ip 200.115.10.0 255.255.255.0 200.105.30.0 255.255.255.0

  access-list 88 allow ip 200.115.10.0 255.255.255.0 200.105.10.0 255.255.255.0

  access-list 88 allow ip 200.115.10.0 255.255.255.0 200.105.20.0 255.255.255.0

  access-list 88 allow ip 200.115.10.0 255.255.255.0 200.105.30.0 255.255.255.0

  pager lines 24

  opening of session

  interface ethernet0 car

  Auto interface ethernet1

  Auto interface ethernet2

  Outside 1500 MTU

  Within 1500 MTU

  MTU 1500 dmz

  IP address outside x.x.x.2 255.255.255.248

  IP address inside 200.115.10.10 255.255.255.0

  192.168.6.28 dmz IP address 255.255.255.0

  alarm action IP verification of information

  alarm action attack IP audit

  172.16.1.1 - 172.16.1.254 test IP local pool

  no failover

  failover timeout 0:00:00

  failover poll 15

  failover outside 0.0.0.0 ip address

  IP Failover inside 0.0.0.0

  failover dmz 0.0.0.0 ip address

  history of PDM activate

  ARP timeout 14400

  Global 1 interface (outside)

  Global (dmz) 1 192.168.6.10

  NAT (inside) - 0 108 access list

  NAT (inside) 1 0.0.0.0 0.0.0.0 0 0

  NAT (dmz) 1 0.0.0.0 0.0.0.0 0 0

  (inside) alias x.x.x.5 192.168.6.30 255.255.255.255

  static (inside, outside) x.x.x.6 10.10.70.1 netmask 255.255.255.255 0 0

  static (inside, outside) x.x.x.4 200.115.10.16 netmask 255.255.255.255 0 0

  static (dmz, external) x.x.x.5 192.168.6.30 netmask 255.255.255.255 0 0

  conduct permitted tcp x.x.x.6 eq lotusnotes host everything

  conduct permitted tcp 2x.x.x.4 eq www host everything

  conduct permitted tcp x.x.x.4 eq lotusnotes host everything

  conduct permitted tcp x.x.x.5 eq www host everything

  driving allowed host tcp x.x.x.5 eq field all

  allow icmp a conduit

  driving allowed host tcp https eq x.x.x.5 all

  conduct permitted tcp 2x.x.x.5 eq 21010 host everything

  the public IP address I need to access it from the inside is x.x.x.5

  Hello

  The ACL you provide will always be the same when shorten you it to this:

  access-list 110 deny tcp host 200.115.10.0 host x.x.x.5

  Access-group 110 in the interface inside

  (it wouldn't work well, because the host 200.115.10.0 * watch the zero * probably does not exist)

  Assuming that your dmz has a lower securitylevel then your inside interface, you must remember that if the packages are make from the highest to the lowest level of security the PIX performs the following operations:

  (1) if it is an existing stream, leave the package through

  (2) if it is not an existing stream, see ACL

  (3) if the ACL refuses, then drop the package, if ACL allows, leave package through

  (4) if the ACL does not at all, leave the package through (since it is the high level of low security)

  But I guess that this is not what you want to achieve.

  I think you need something like this:

  access-list 110 permit tcp host 200.115.10.40 x.x.x.5 eq www

  access-list 110 permit tcp host 200.115.10.41 x.x.x.5 eq www

  access-list 110 permit tcp host 200.115.10.42 x.x.x.5 eq www

  access-list 110 deny ip 200.115.10.0 255.255.255.0 255.255.255.0 x.x.x.0

  (assuming that you have a 24 - bit subnet on your dmz)

  access ip-list 110 permit a whole

  Access-group 110 in the interface inside

  This will allow three internal hosts to access the server x.x.x.5 you dmz with HTTP, than anyone else on the 200.115.10.0/24 subnet to the dmz and allow traffic on all the others outside.

  I hope this helps.

  Kind regards

  Leo

• access lists

  I have a question... or two... :) on access lists.

  My current access list looks like the following:

  access-list acl_outbound allow icmp a whole

  acl_outbound list of access allowed tcp 192.168.50.0 255.255.255.0 any eq 80

  acl_outbound list of access allowed tcp 192.168.50.0 255.255.255.0 any eq 21

  acl_outbound list of access allowed tcp 192.168.50.0 255.255.255.0 any eq 22

  acl_outbound list of access allowed tcp 192.168.50.0 255.255.255.0 any eq 8080

  acl_outbound list of access allowed tcp 192.168.50.0 255.255.255.0 any eq 443

  acl_outbound ip access list allow a whole

  access-list acl_inbound allow icmp a whole

  inside_nat0_outbound 192.168.50.0 ip access list allow 255.255.255.0 host Bluff_Outside

  outside_cryptomap_9 192.168.50.0 ip access list allow 255.255.255.0 host Bluff_Outside

  1. I get no response to external IP addresses with my permit icmp echo. I have to specify what type of ICMP traffic as echo response on the end of the statement of license? I assumed not to put a specific function of what ICMP permit would allow all ICMP traffic, but I guess I was wrong.

  2. also suggestions on how to improve my access lists would be appreciated. Just because it might "work" does not mean that it is the best way.

  As I noticed that I had to have the ip permit any one to make it work, but am not sure exactly what is happening when I apply that statement to allow permit tcp statement work correctly.

  My goals are:

  allow hosts listed web traffic (including https and ftp)

  allow ICMP pings pass from the inside to the outside and the response

  allow VPN tunnels to establish

  Thank you all for your help. This forum was very informative and useful with previous posts, I'm sure it will be with this one as well.

  Dave

  The question is now that you have an incomplete encryption card on your PIX, which effectively blocks ALL outgoing traffic. Add the following line:

  > card crypto outside_map 9 match address outside_cryptomap_9

  to your PIX. This should get the traffic flowing again. Although passed by the hit counters your ACL, try to ping the host Bluff_Outside to test your ping? If so, then your config crypto says to encrypt all traffic as well, which probably won't work unless the Bluff is configured correctly. Better to make things as simple as possible while you are testing, then I recommend to take the crypto stuff for now with:

  > no outside_map interface card crypto outside

  Reading through your original post, when you access list only allowing certain protocols TCP, and you found that it did not work, was it web browsing that didn't work? If so, whether you have been reviewed by name rather than IP address, and depending on where your DNS servers, you probably also needed to enable DNS lookups via (udp port 53). MANY people forget this.

  In addition, in my humble OPINION, most of the clients that I have seen that initially only allow certain outgoing protocols, eventually find it's more pain than anything like their users say "I need to use this Protocol" and "I need to use this Protocol. Just be tired if you want to go down this road without a valid reason, you can cause a lot of extra work for yourself. What could be easier is just to make sure that your inside the subnet and only your home subnet, can get out by doing:

  > acl_outbound 192.168.50.0 ip access list allow 255.255.255.0 any

  This limited kind of all other connections rear door inside your network by your PIX and Internet connection, but still allows all your users go out and do what they want. Oh you obviously.

• ICMP / ACCESS-LIST

  If I access-list and statements ICMP on the same interface, which contradicts the other, who gets preference. for ex. If I refuse a package in icmp and allow the access-list package, which wins.

  Access lists apply only to passing packets * by * the PIX. ICMP commands are applied to the PIX interfaces themselves (meaning premitting or deny ICMP packets to the PIX interface address). So, to answer your question, it depends on what you are trying to ping ;)

  Scott