Cisco Firewall :: 2811 - Limitations To ACL List Length
Sep 20, 2011
I came across this site. I wanted to produce a better incoming ACL at home and work to prevent known bad sites
Here is their list of the Top 10 Global Spammers is out. The biggest surprise on the list is Korea, as it takes over the number one global spammer spot from China. With the improved high speed internet infrastructure in Korea and ease of network access, who knew Korea would be on the rise.
Here is the complete Global Spanner Top Ten List for the first quarter
[URL]
Korea
China
India
Russia
Turkey
Viet Nam
Ukraine
Brazil
Venezuela
Pakistan
When I sort the list, it is over 16k lines of ACL!
My question relates to what performance limits I would find.
Can I actually put that many lines in an ACL?
Will the router choke and do any other work
I have attached the sorted ACL list for you to review
Any of the following router lines will accept a list that large and still run acceptably?
2811
2911
3925
2945
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Sep 3, 2012
I have a router 2811 that it's configured with VPN remote access and I'm trying to block clients based on their MAC address, I tried configuring access interface as routing/bridging, configured an ACL 750 for 48-bit MAC address access list and enable "bridge-group 1 input-address-list 750" command on bridged interface, but the only match I got when VPN clients access the LAN is from router interface.
Internet(VPN) ---> Router1 (FE 0/1) ---> Router1 (FE 0/0) --> Router2 (FE 0/0) --> Router2 (FE 0/1) --> LAN
I tried configuring on Router1 (FE 0/0) interface and also on Router2 (FE 0/0) interface with same behaviour. Router2 is used for internal NAT.
bridge irb
bridge 1 protocol ieee
bridge 1 route ip
[Code].....
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Dec 25, 2012
I have been trying to figure out a NAT issue on my 2811 and the inspect engine.I have 'ip inspect FW out' on my outside interface. If I turn it off, I also have to remove the access-list applying to inbound traffic on that same interface. Why is that? This whole thing centered around SIP registrations from devices on my LAN to my provider. The provieder is showing that I am registering from a high end port (1024 or something crazy). He said that it sounds like some type of SIP ALG or something on my router. For the life of me, I can't figure out what would be causing it. I am just using a standard route-map that points to the outside interface using 'overload'.
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Aug 20, 2011
I have recently purchased 2911 routers running 15.1 to replicate a system I had implemented using 2811 routers running 12.4 a few years ago. None of my applications and servers have changed, but trying to determine why my router access-list on my serial links are not behaving the same. I don't keep up with Cisco changes.
On my original system, which is a private network that distributes a lot of udp broadcast and multicast data to remote sites over 64k serial lines, I manage some of the udp broadcast data using access-lists. When I check on my 2811-based system, "show ip access-list" shows a nice distribution of filter hits showing my expected deny/permit access-list entries working as expected allowing me to filter the particular udp broadcast ports of interest on the various serial interfaces.
On my 2911 based system, with most other elements the same, the access-list is not working correctly, and I see data getting through the access control to the other side of the serial link. Using tcp dump and other tools on the remote systems my routers attach to, it looks like the access control is basically ignored... though if I "shutdown / no shutdown" the serial link between the routers, it definitely stops and restarts the flow of data, so I know data is traveling over that interface... when I run "show ip access-list" on the 2911, I see tons of hits on one deny filter, and the last "ip permit any any" filter, but other deny udp any any eq XXX port filters are simply not registering denies.. which should be triggering since I see my server sending the data, and my client systems receiving the extra data I am supposed to be filtering on the router...
Is there potentially a new feature or command set option that I am missing to correctly filter outbound data from my serial links?
On 2811 w/ an
HWIC 4A/S int s0/0/0
ip access-group sample1 out
ip access-list extended sample1
{code]...
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Feb 22, 2013
I have a ASA5505 that i have running asdm 6.4 on it and have tried setting up some DHCP scopes for the interfaces.I have the security plus key.I set up 4 interfaces all with different subnets and all with different DHCP being doled out by the firewall for the time being.Anyway, 3 of the 4 work.I have tried to change interfaces wondering if there was an issue with that phy device.I tried enableing the subnet that would not work first and it didnt matter still would not issue dhcp.the other 3 work fine.Is there a limitation to the amount of scopes that will issue dhcp for an asa5505 ?
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Nov 17, 2011
Our company is planning to buy one of cisco ASA 55xx series.But there is still one question left about DHCP pool limitations.Here I found some information about licensing for DHCP on ASA 5505: [URL]In other words, we don't have any information about ASA 5510, which contains DCHP pool licensing.
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Sep 19, 2011
We have an Active/Active ASA 5520 setup, as i know in Active/Active setup there is no remote VPN access, So i could overcome this limitations?I have a solution but i dont know if it is ablecable or not? we have a spare ASA 5510, so i can use it behind Active/Active Firewalls and assign a public static NAT IP address to it and open all IPSEC and VPN ports and let the remote users to connect to it, is this ablecable setup or not?
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May 17, 2012
Boss wants a listing of the firewall rules only. What's a command I can run that will give me a listing of this?If I can get an output of firewall rules only, via GUI, that'll work too. It just needs to end up with a printout on a piece of paper telling me what the firewall is doing.
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Feb 23, 2011
I have a question about access-lists on ASA: (5520 running 8.4)Often I want to permit all traffic from networks behind an interface (let's say DMZ in this example) to Internet, but NOT to internal networks. Then I first configure a Deny from DMZ to all internal network and then a Permit to ANY. If I forget the first Deny I will allow all traffic also to my internal networks. Is it possible to configure an access-list that permit all traffic from a network to all networks that are reachable via a given interface? In this example: Permit all traffic from DMZ to all networks that are reachable via the Outside-interface? This should permit traffic to Internet and deny traffic to internal networks in one statement.If I specify the outside-interface as the destination only traffic to the interface itself will be allowed.
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Aug 24, 2011
I am having a problem getting this to work and I have always done it with 2 Static ip address. but now this company changed to 1 and I am doing something wrong.
I have comcast with 1 static IP, I have a local LAN with 6 host and 1 server that does Mail and remote access and web traffic.
I need a config that allows me to use 1 static ip on the outside interface of the PIX and allow with an ACL 7 ports open to the server and allow all the local host out to the internet.
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Apr 2, 2013
I have a router in front of a few firewalls on an internet link. All traffic from the inside network must go through one of the firewalls to get out through the router and similarly there is a dmz on one of the firewalls.I am trying to make sure the router is fully hardened.Should I apply an access list on the outside interface of the router along with the access list for management access?
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Oct 30, 2012
Trying to figure this all out. I'm getting untranslated hits. I posted the config I have so far.
Code...
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Mar 11, 2013
This is a working example using static. But it doesn't work with the dynamic interface or I'm doing something wrong. Need to get rdp access to my laptop.
ASA Version 8.4(5)6
!
hostname ciscoasa
enable password 8Ry2YjIyt7RRXU24 encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
names
[code]...
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Jul 1, 2011
I need to configure the access list on the outbound internet port to accept the following:
ip access list 10
access-list 10 permit PPTP vpn any xxx.xxx.xxx.xxx
access-list 10 permit RDP any xxx.xxx.xxx.xxx
access-list 10 permit FTP any xxx.xxx.xxx.xxx
access-list 10 permit Postgresql any xxx.xxx.xxx.xxx
access-list 10 permit MacARD any xxx.xxx.xxx.xxx
This method does not work on the Cisco 2921 router with FW
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Feb 26, 2013
So in the past from 8.2 down I had one to one NATs like so
static (inside,outside) A.A.A.A B.B.B.B netmask 255.255.255.255
but for 9.1 im running now I need to do this
object network obj-B.B.B.B
host B.B.B.B
nat (inside,outside) static A.A.A.A
So if I make an ACL to permit outside public access to the public IP (A.A.A.A) in 9.1 do I use real B.B.B.B ip address or the object itself obj-B.B.B.B?
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May 2, 2012
Working as a consultant I find it annoying I cannot see a drop-down list in the AnyConnect client as you can with the traditional IPSEC VPN client with multiple profiles. How to modify the default profile to list multiple entries?
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Mar 4, 2012
On firewall we have zone created for dmz and ip is 192.x.x.x and it is connected to 2950 switch(DMZ switch) with vlan 25..We have L3 switch on this we have created vlan 25 and connected cable from L3 with 2950 switch with vlan 25
As we have the servers on L3 and wanted to bring on dmz zone we have connected a cable.Now the problem is when i connect a pc on 2950 switch (directly on dmz switch) with access-list below we are not geeting any hist on it.
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Apr 5, 2011
How to designate access-list for the remote access vpn users in order to let them access specific subnet or host,asa 5510 and acs is in the picture
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Oct 12, 2011
How to list ports open on Cisco ASA 5505 appliance? I have tried to see using Cisco ASDM launcher, but no luck.
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Sep 14, 2011
I'm trying to configure an extended access list on one AS5350XM but I get one way hearing on a voice calls and I can't determine why (please see the attached diagram). There is an OSPF running on both gigabit interfaces and the Loopback address is also advertised (it is actually the voip IP address). The access list is applied on both interfaces in the inbound direction. There is another gateway with IP:4.4.4.4 (no firewalls here) and the routing between gateways is working properly.
Here is part of the access list (applied on AS5350):
.
.
permit ip host 4.4.4.4 host 3.3.3.3
.
.
When I review the log of the AS5350xm I see many errors like this one:
%SEC-6-IPACCESSLOGP: list example denied udp 3.3.3.3(16638) -> 4.4.4.4(18094), 1 packet
So how it is possible to see this error since the access list is in inbound direction and the IP address (4.4.4.4) is open. I don't have problems when I do telnet or ssh from 3.3.3.3 to 4.4.4.4.
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Mar 22, 2012
I am unable to remove an access list. Currently this this access list contains 4 lines of remarks. I was unsure if I was entering the command correctly and now I have 4 lines of "trash" that needs to be removed.
Symptoms:
The "sh run" command shows that I have access-list 100 defined.
The "sh access-list" returns nothing.
Process I have tried: config t
no access-list 100
no access-list remark Test (just trying anything at this point)
clear configure access-list 100 (This returns "Invalid input detected at '^' marker" and the '^' is under the 'e' in clear.)
So the "clear configure" command is not working. The "no access-list" commands does not return an error but does not remove anything.
What step am I missing? Let me know if I can provide any more information.
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Jan 4, 2012
ASA 5505 vlans routing & access-list?
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Apr 24, 2011
I have just upgraded a ASA5510 from 8.2 to 8.3 using migration tool.All seemed to go well, still double checking the config as this is a bench test of upgrade prior to filed upgrades.
Anyway one thing that is slightly frustrating is that the migration has expanded all of my access-lists, so we maybe had 10 lines of config relating to access-lists based on access-groups, now we have hundreds of lines.On ASDM this is bad enough but on CLI with show run its a bit of a bind.
Is there any way to un-expand the access list or do I simply delete and start again using my access groups.
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Apr 18, 2012
I try to implement the url filtering feature on a cisco 2811 router and whenever i enable the parameter map patterns the router retuns (after some time)
%Unable to compile obj regex.[code] The result is that the router blocks ALL webpages without giving a block page message.
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May 26, 2012
I have a 2811 ISR configured to provide the following services to my network:
Internet access to LAN users Cisco Call Manager ExpressSite-to-stie VPN to 3rd party networksVPN server to provide VPN access to remote usersSecurity Zone configurationsStatic NAT configurations Now I recently just got the ASA5510 device and I am not sure how to go about with the setup, whether to put the ASA in between the internet and the ISR (Internet - ASA - ISR - LAN), or put the ISR in between the internet and the ASA (Internet - ISR - ASA - LAN)?
While i know I can move most of the config unto the ASA, i know that the CME cannot be moved, hence I would like to do the setup such that users on the network still have access to CME.
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Nov 7, 2011
I'm trying to add an access-list rule to allow internal servers to connect an outside host on a asa 5540. The hostname translates to multiple ip's. Normally I just lookup the ip address or one of the ip's the hostname translates too and use that in the access-list as the host. For some reason the actual ip's, which are a few, are not always available so using a specific ip sometimes does not work, thus the reason I have to use the hostname instead of the ip. I have 2 hostnames. www.hostname.com and subdomain.hostname.com.
This is how I normally add these rules (the ip addresses are fictive): access-list internet_access extended permit tcp host 192.168.50.5 host 84.115.57.121 eq www log
When I try to add this using the hostname on our asa I get an error: access-list internet_access extended permit tcp host 192.168.50.5 host www.hostname.com ?ERROR: % Unrecognized command
I've tried it without the 'www', so hostname.com but same error.
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Jun 27, 2011
I have very strange behaviour on my Cisco 2801 router when I applied access list on wan interface.
Architecture:
SIP Provider <----> Cisco 2801 <-----> CUCM 6
Problem:
We are using Cisco 2801 as Voice gateway for CUCM 6. so only one purpose of this router is just receiving calls on sip dial-peer and transfering to internal network.
If you look on access list below, if 'log' words don't present on these 2 lines, access list didn't work. Problem with it is that when I establish call from us or to us I can't hear incomming RPT stream, but other side can hear me. But when I type word 'log' there, everything stars working immediately.
Cisco 2801 IOS version:
Cisco IOS Software, 2801 Software (C2801-ADVENTERPRISEK9_IVS-M), Version 12.4(6)T9, RELEASE SOFTWARE (fc2)
[Code].....
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Mar 14, 2013
I created some acess-lists, and you can assign a logging level to this access-list. Now this ACL has a lot of hits, so i want to see whats happening. Only the log I then see is completely empty. I cannot figure out how to get some info in that log.
I think there is some global logging setting i probably need to enable in order to get anything logged at all, but i cannot figure out which.
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May 10, 2011
I am troubleshooting a s2s vpn between an ISR871 and my ASA5520 and I suspect a problem with my crypto-maps.
Is there a way I can display an access-list on the ASA and have the object names substituted with their IP addresses?
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Aug 11, 2011
I am pretty new to the configuration of a DMZ and I have the task of setting one up.I have a Cisco 2811 Router running Cisco IOS Software, 2800 Software (C2800NM-ADVENTERPRISEK9-M), Version 12.4(24)T1, RELEASE SOFTWARE (fc3), 2 FE interfaces.One FE is connected to the WAN, with a loop back interface configured with the public IP for Internet access in the office.The other FE has 2 sub interfaces configured, one for data and the other for voice traffic.Users within the office are configured to use the data VLAN to access the internet through the WAN.
Now we are setting up some new services and we require to have DMZs setup.I want to setup 3 zones now that the different servers would reside in. How can i achieve this using the existing infrastructure I have?I have an idea to create more subinterfaces and assign them to the zones, but I am still not sure how this would play out. I have been on this for the whole day and unable to make significant progress.
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May 17, 2011
I have attached a drawing of our network. We have two 6509's connected to two Cisco 2811 (onsite) that the ISP owns. I am trying to get one side up and running before I worry about redundancy and so forth. For this reason I have set all the HSRP priorities to 110 on the left 6509. I have HSRP running between the ISP routers and V LAN 101 of the 6509's. This works as I can ping yahoo and Google just fine from the 6509 switch. I can't get from my laptop connected to V LAN 23 to the internet.
It doesn't even attempt to NAT as there are no translations. I have public address assigned by my ISP configured between the ISP routers and my 6509 on V LAN 101. I then have the public address assigned to V LAN 100. I configured V LAN 100 on the switch and V LAN 100 on the FWSM with the IP address in the drawing. I have my NAT statements and route in my FWSM according to the drawing as well. On the switch, I have a default route to X.X.12.19 which is the VIP between the ISP routers. I can reach anything on the inside of my network, including the old network addresses from V LAN 23.
1. Is it best to do NAT at the FWSM or should I do it on the MSFC connected to the ISP routers?
2. If I have to configure NAT at the FWSM, does this requires me to extend the public network down to the FWSM?
3. I'll take any examples you may have as I am stuck.
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Jul 31, 2012
I'm trying to run ZBFW on a 2811 with IOS version 15.3(T4) and I'm running into a strange issue I'm not quite sure how to troubleshoot.
I have 3 zones, internet, local, and ssl-vpn.The rules I'm trying to enforce are: all traffic from SSL-VPN can go to anywhere, anywhere can go to SSL-VPN. Anything originating from local can go out. Certain ports can come in for DMZ services (http, https, imap/s, pop3/s, submission).
After rebooting the router and applying f0/0 and tun0 to internet, f0/1 to local, and virtual-template 1 to ssl-vpn things work fine. But after a while I stop being able to connect to servers at the high end of the subnet. (I have .20 to .26 configured with the services, .20, .21 work fine always, .22 and up stop responding). Remove interfaces from the ZBFW, no problem at all. Apply ZBFW, traffic stops.
I'm seeing dropped sessions in the log on zone-pair local-to-internet , invalid flags with ip ident 0 which I think is outbound traffic attempted for no inbound inspect entry, but everything should be allowed out, and the traffic is to port 80 which is allowed by 'match protocol http' on the inbound policy.
Edited config attached (remove passwords and stuff) Last few log lines are at the bottom.
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Dec 10, 2011
I am trying to remove a line in a particular access-list configured in a FWSM module using this command "no access-list <acl> line 19 x x x x" but it doesn't work. See below:
FWSM/xxx03(config)# no access-list ?
configure mode commands/options:
alert-interval Specify the alert interval for generating syslog message
106001 which alerts that the system has reached a deny
[code]...
How can I remove a line from the access-list without clearing the entire access-list?
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