Cisco Firewall :: ASA 5510 How To Limit Icmp To Just Single Host
Nov 1, 2012
I am working on an ASA 5510 on 8.4 IOS and need to know how to limit icmp to just a single host? What I would like to do is be able to PING from the Inside interface 10.X.X.X to host 4.2.2.2 on the Outside, but thats it no other host would be PINGable.I tried MANY different access-list statements but the only way I can get icmp out and working is using the "fixup protocol icmp" but then everything is PINGable and the ASA does not block anything.
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Feb 26, 2013
I updated an ASA 5505 to 50 users, but I still can only connect 10 hosts. In Licensing it show 50 insides hosts. I also tried to update to ASA 8.4.5 but that did not work.
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Sep 19, 2011
So I have my shiny new (used, but new to me) 5510 finally working and installed in my Dev network. I need to have icmp (ping and trace route) available from the inside network. I Google and found a few articles on how to do it. I tried modifying the class maps, but it looks like there are changes in the commands in 8.4 and the articles I found evidently were for 8.2 and lower. I tried doing it with access lists, again from examples and traffic stopped in all directions (not good) so I am back to being functional and how to do it in 8.4. Documentation seems sparse on the net with 8.4
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Apr 16, 2013
I have ASA 5510 with soft version 8.4(5) installed. There are two interfaces:
IP 1.1.1.1/24 - inside
IP 2.2.2.1/24 - outside
I have configured PAT, so network 1.1.1.0/24 gets NATted to 2.2.2.2 address. Everything works fine, except I can't reach 2.2.2.2 via ICMP from the internet.
X.X.X.X 2.2.2.2 Deny inbound icmp src OUTSIDE:X.X.X.X dst OUTSIDE:2.2.2.2 (type 8, code 0)
But I have configured an access list allowing ICMP from any to any: access-list outside_access_in extended permit icmp any any
Thus address 2.2.2.1, which is binded to outside interface itself, is perfectly reachable via ICMP.
I've got two questions:
1) Is there a way to fix it? It will be handy for diagnostic purposes.
2) is it possible to configure the secondary IP address on the interface on ASA? I've read, that there are some complications.
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Jul 12, 2011
I have an ASA5510 running version 8.4. ICMP is blocked from the internet to the outside interface of our firewall but now our ISP is requesting us to allow ICMP from their network to the outside of our ASA. I need to allow ICMP from three blocks of IP Addresses?
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Oct 25, 2011
I am having some issues with my ASA 5510 (running ASA 8.2) dropping ICMP unreachable-fragmentation-required-but-df-bit-set type messages coming in on the outside interface. I have the following entry in the ACL for the outside interface:access-list outside_acl extended permit icmp any interface outside and there are no other entries in that list that should take precedence and drop the packet. Pings from outside to the ASA work when this ACE is present and do no when it is absent so it is clearly taking effect. I see the following entries in the debug log when sending a large non-fragmentable packet (that would cause an intermediate router to send back this ICMP response) out to the internet through the ASa,As far as I can tell I am not running ICMP inspection; I don't want it to do any stateful magic here since the outgoing traffic would have been ordinary data from another protocol and would not have caused an outgoing ICMP connection to be built to match against.
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Feb 5, 2012
I need to create a firewalled segment that not only separates hosts from general population, but also from each other. The solitary confinement of firewalled segments.I know that I could create a bunch of sub-interfaces, one for each host or group that needs to be isolated, but I'd really rather not have to do that if possible. 1) It could become a management nightmare between ACLs and sub-interfaces and 2) it's a waste of IP addresses.s there any way that I can create a bunch of separate VLANs behind the firewall and have them all terminate at the firewall, using a single firewall IP address for the gateway?
VLAN 1 - hosts 1.1.1.5 and 1.1.1.6VLAN 2 - hosts 1.1.1.7
Firewall DMZ Interface - 1.1.1.1VLAN 3 - hosts 1.1.1.8 and 1.1.1.9
This way, the hosts are isolated and can't talk to each other unless they're on the same VLAN.I'm working with an ASA 5510 running 8.2.4(4).
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Dec 14, 2012
We just changed ISPs and now have a /29 routed subnet to be used on our ASA 5510 (8.4) instead of the one public ip we had before.There are a couple of PAT translations that were previously setup on the "interface" address which i now want to assign to a different ip address further in my subnet.
So i just changed this:
object network BMMM
nat (inside,outside) static interface service tcp smtp smtp
to:
object network BMMM
nat (inside,outside) static other.external.ip.in.subnet service tcp smtp smtp
And assumed that this would work,y it does not, and this leaves me unable to contact that machine from the outside.And shoud i also change my access-list?The relevant access-list rule is:access-list outside_in extended permit tcp any object BMMM eq smtp
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Jan 17, 2012
I'm trying to limit one of my inside hosts, since it's been a little of a hog. I have 3Mb available from my ISP via 2x T1. I'm testing this on a computer in a lab:
PC 10.10.10.10------Cisco2960-------- 10.10.10.1 Inside - ASA - Outside 208.66.x.1------------------------208.66.x.2-Cisco 2811-2xT1
Here's what I've tried so far, please see text in red:
***global (outside) 1 208.66.x.115
***nat (inside) 0 access-list No-Nat
***nat (inside) 1 0.0.0.0 0.0.0.0
[Code].....
It didn't work... I was able to max the bandwidth again. I also tried to apply service-policy to inside int, which didn't make a difference.
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Jan 17, 2012
We have an ASA5510 running version 8.25. This is in our central office in London. The London network has an ip address range of 10.110.128.0/22. Connected to this via a site-to-site VPN we have a satellite office that has an IP address range of 172.16.148.0/22.
We have now connected to our parent company via another site-to-site VPN connected to the same ASA5510. Their network has an internal range of 10.110.18.0/24. It was our parent company that issued us with our range of addresses a long while ago so that it all fits in with the rest of the company.
We have resources (web servers) on their network that we use which work just as it all should. We now want to allow our satellite office to view those same web servers. The problem is that only 10.110 addresses can flow to our parent company.
I have configured the firewall at our central office and our satellite office to route across to our parent company via our network network and the packets are flowing just fine except that obviously once they reach our firewall they cannot go to our parent company because the 172.16.148 range cannot be routed there.
My idea is to NAT traffic from our satellite office to one of our local addresses before it goes over to our parent company network.
For example: If someone in our satellite office with an IP address of 172.16.150.5 attempts to request a resource from 10.110.18.12 then the request would go via the VPN to our firewall and then get NATed to 10.110.131.200 before being passed on to our parent company network.
My question is what would the NAT configuration be to achieve this. I just cannot work out what type of NAT I would need or how to construct the command. It's probably PAT as it will be multiple addresses to a single address. Essentialy, all traffic from 172.16.148.0/22 destined for 10.110.18.0/24 should get NATed at our firewall to 10.110.131.200 before being passed on.
Just to add, we already have this working from our Cisco 3000 Concentrator which is now going to be phased out hence trying to get this to work on our ASA. The satellite office has now been moved to the ASA and as of today our parent company has been moved to the ASA.
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Feb 1, 2012
I have a private network behind a configured Cisco ASA 5510. I need to send data back and forth between a server on the inside network and a device on the outside network on port 44818. No amount of configuration is allowing this to happen. The packet tracer always fails on of the implicity "deny" rules, even though my other rule should explicitly permit it. I also realize I need to set up routing from my outside network to the inside network, but I cannot see from the documentation how to do that on this particular port without simultaneously breaking my outside connection.
The inside IP for the ASA is 192.168.25.1
The outside IP for the ASA 192.168.11.54
Here is my current configuration:
: Saved
: Written by enable_15 at 08:49:25.956 UTC Thu Feb 2 2012
!
ASA Version 8.2(5)
[Code]....
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Dec 18, 2012
I am working on a project to migrate a single Checkpoint firewall over to a single ASA 5510, no VPN, just firewall. The checkpoint firewall has 8 physical interface so the ASA 5510 also support physical 8 interfaces so thiw will be a one-to-one swap. At the moment, I don't have an ASA 5510 to test my theory so I am going to throw it out here. The checkpoint firewall is a SPLAT running on an powerfull IBM Server with 8 CPU dual cores with 32GB of RAM and it has 1200 rules with over 120,000 objects with some of the crazy NATs but it works so we will just leave it at that. There are not that much traffics going across the firewall so there are no need to put in an ASA 5585
I use the cisco conversion tool to do the policy conversion from Checkpoint to Cisco, I get about 1.5 million lines in the configuration. A lot of it has to do with Checkpoint having no concept of interface security level while ASA does. I am sure I can optimize it to cut down the number of lines in the configuration; however, that is not my main concern at the moment. The customer goal is that at the time when cutover from Checkpoint to Cisco ASA, they want everything to be perfect, meaning that it will work like magic.
My question is that can the ASA 5510 handle 1.5 million lines of configuration? Are there any limitations on this? I know there are limitations with FWSM but since I don't have an 5510 to test.
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Sep 8, 2011
I would like to know if there is a way to apply in the Cisco asa 5510 traffic shaping not for a interface but a single IP address.For example i would like to limit the bandwith for the IP address of my FTP server.
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Apr 26, 2011
I am trying to telnet to my asa 5510 from the core swith,however i received the below msg,how enable it?
172.30.1.100 is the inside interface of the asa
CITYCORE#telnet 172.30.1.100Trying 172.30.1.100 ... % Connection refused by remote host
CITYCORE#
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Oct 29, 2012
We have Cisco ASA 5510, I am about to add another 2 Objectgroup network groups on the firewall to our already growing list. Under this Object-group Network xxxx , we are planning to add about about 500 network-object host xxx.xxx.xxx.xxx . This objectgroup will then be applied to an ACL. Just wanted to know if thats possible - meaning addnig 500 hosts? If it is whats the limit?
Also are there any other things to keep in mind before i go-ahead with this huge object group?
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May 7, 2012
ASA 5510
Ver 8.2(5)
I have been looking all over the place for the answer of how to allow clients on an IPSEC VPN to ping from host to host.
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Jul 29, 2012
In ASA 5510. How I can limit the users in (VLAN 20) to use the internet with a limited Bandwidth/speed with 3 mbps upload and 5 mbps download?
In case the outside interface (Native vlan) which is connected to the ISP and have a bandwidth/speed of 30 mbps upload and 50 mbps download.
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Jul 30, 2012
I have an ASA 5510, one public IP address on my outside interface, an internal email server and a private network.I would like...
1: Users on my private network to be able to access the internet (PAT them to external outside address)
2: Email to be delivered to my MX (my single public IP address translated back to my internal email server.
i.e. can I share my single public IP address to serve translation in both directions (private users surfing the Internet (in-to-out) and an outside to inside NAT for email) ?
Email (MX) = 1.2.3.4
Public (outside) address = 1.2.3.4
Email server internal = 10.1.2.3
Internal private subnet for users = 10.0.0.0/8
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Nov 28, 2012
Version: Cisco ASA 5510 8.4(4)1
I've installed cisco asa 5510.
When I "show local-host all detail connection "
Normal situation:
105 myfailover:10.255.255.2/0 NP Identity Ifc:10.255.255.1/0,
idle 0s, uptime 1D14h, timeout 2m0s, bytes 18196822
But I got this output ( timeout - )
[URL]
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Feb 20, 2012
I am working on replacing our Checkpoint Firewalls with ASA's, and am running into the following NAT problem. On some of our Checkpoints, there are external NAT's that are mapped to multiple internal hosts based on ports.Is there any way to translate that to the ASA? I'm not sure the ASA will let you have multiple internal hosts mapped to one external IP using static NATs. The main issue, is these are alarm panels that receive data from external hosts (the traffic is initiated externally on the Internet) so I can't use dynamic PAT with this.
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Apr 1, 2012
I'm new to an ASA 5510 running 8.4(3) and am trying to figure out something regarding time ranges in ASDM. I simply want to allow a single port during business hours only (I'm not concerned about open sessions needing to be closed). So as an example I add a rule something like:
(RULE1 on the internal interface) SRC=INTERNAL DEST=ANY SERVICE=RDP ACTION=PERMIT with a time range set for weekdays 8:00-16:59. I did a test after 5pm on a weekday and was still allowed to do RDP to a server (from INTERNAL), and after using the packet trace tool saw it was still passing through due to a rule a couple lines down (rule 4) that allowed a port range that happened to include port 3389. So my question is if I specify an "allowed" time range and someone attempts access outside that time range, why doesn't it drop it right there? I guess I'm assuming that anything outside the "allowed" time range would be dropped but that doesn't seem to be the case. I'm also assuming the rule base is processed top to bottom.
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Jul 27, 2011
I have just set up a 881W appliance for a satellite office. At this time, we don't need a site to site vpn. However, I have EZVpn configured on it and working great so that I can connect from our main office for admin purposes. How can I setup up a firewall rule/policy in order for only our main office IP to connect to Ezvpn? I don't want to allow access to the VPN from any other IP other than our IP at our main office.
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Sep 28, 2011
I thought that in the past I had problems with my ASA5505 because I had to reboot a number of times, now that I have logging enabled I can see the following: -Deny traffic for protocol 17 src inside, licensed host limit of 10 exceeded.Does this mean that I can not have any more than 10 inside host going out of the outside interface at any time, if not what this means and how I can solve it.
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May 18, 2011
I have a hub and spoke network with over 100 remote sites that connect to me via ipsec vpn. One of these locations, the only one using FIOS coincidently, is initiating 200+ tunnels back to my side which is causing saturation issues on my DS3. (I can post config if requested), and how can I limit the number of active tunnels it's establishing?
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May 28, 2012
I have a ASA 5510 that has multiple site to site VPNs. I need to create an additiona site to site VPN but only allow 1 host to access and traverse the tunnel. The network is on a 192.168.5.x but the host that will need to access this tunnel needs to be on a 172.16.33.x network. I dont want any other traffic allowed to access or traverse the VPN tunnel for this host. How can I set this up?
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Jul 17, 2012
I want to allow ICMP traffic on ASA 5510 from LAN interface to DMZ. I've permit any traffic and added ICMP to the inspestion list also but still there is problem. Belos is the configuration. The image is asa822-k8.bin
:
ASA Version 8.2(2)
!
hostname fw-01
names
!
interface Ethernet0/0
[code]....
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May 1, 2011
two 6509 chassis with VSS configuration.One of those chassis have one FWSM installed and the configuration is like this:
Switch: firewall multiple-vlan-interfacesfirewall switch 1 module 3 vlan-group 1firewall vlan-group 1 3-5,7,8,10,200 interface Vlan200 ip address 10.50.50.1 255.255.255.252end
I am not receiving icmp replays from the fswm interfaces if i try to ping 172.20.80.1 from 10.50.50.2.I do not see any debuging info in the logsI successfully ping 10.50.50.2 from the inside networks int the cat6500, but int the network 172.20.80.0, can not ping 10.50.50.2.
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Oct 7, 2012
I am able to establish a single VPN session on an ASA 5510. The network is as follows:Cisco 2600 router----> ASA 5510---->non cisco UTM----> LAN.Once another session is connected (same profile different username) is connected the first one disconnected.
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Jan 26, 2012
How can I dedicate a single VPN NAT ip to a single client VPN ? I dont want this ip used by another vpn client....
I got a ASA 5510 with a dhcp pool.cisco vpn client 5.0
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May 3, 2012
I have a 5510 using AnyConnect VPN clients. I have a DNS name for my router to accept connections ie cisco.mydomain.com..I can ping the address by hostname from the clients machine ok but when the AnyConnect client opens it has my hostname ie (cisco.mydomain.com) but says "invalid host entry" I have to type in my IP address for it to connect.I have the hostname in my AnyConnectProfiles.xml.
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May 23, 2012
I'm having issues with NAT dropping ICMP on default NAT. Do I need to create another NAT for ICMP?
Here's the packet-tracer result:
firewall01# packet-tracer input inside icmp 172.23.1.74 0 10 8.8.8.8 detailed
Phase: 1
Type: ROUTE-LOOKUP
Subtype: input
Result: ALLOW
Config:
[code]....
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Jun 27, 2012
Is it really the case that the ASA will not generate ICMP Host Unreachable messages for sub nets connected to any of its interfaces (in breach of RFC1812) as claimed here: [URL]
I'm investigating a situation where an organization uses ASAs to control traffic between different v lans in their internal production systems as well as Internet traffic. They are having problems with internal load balancing because the ASAs do not (as currently configured) generate Host Unreachable packets. Can this be changed in the configuration or not? I have to say, if it can't then I'd urge them to find something else to route between their internal sub nets.
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Mar 21, 2012
Is it possible for AnyConnect to utilise the backup server defined in the connection profile when the session limit is hit on an ASA? Essentially if I hit the 250 limit on my ASA 5510 in Region A, will it try the backup server ASA defined in the connection profile which is in Region B?
From what I have read, the backup server only kicks in when the AnyConnect client cannot connect, but in this scenario it will connect but get an error message.
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