Cisco Firewall :: ASA 5510 Allowing ICMP Unreachable On Outside Interface
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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May 31, 2013
Attached is our network diagram showing the details of our remote office and the corporate side which are connected via private fiber. The workstation (10.10.102.84) can ping the 10.20.0.31 IP address of the PBX but not the .30 address and I know if we can’t ping it we can’t remotely manage it. The 2811 router, ASA 5510 and the 6509-E can ping both IP addresses on the PBX. The ASA logs the error "Denied ICMP type=0, from laddr 10.20.0.30 on interface inside to 10.10.102.84: no matching session" when the workstation pings the .30 address.
We changed the default gateway of the PBX from 10.20.0.2 to 10.20.0.1 (2811 router) and we were able to ping both IP addresses from the workstation but the SIP trunks from the Internet stopped working (they NAT to the .30 address). Because calls may be forwarded from the PBX to the corporate network (via IP phones) we will eventually need to change the default gateway to10.20.0.1 and still need the Internet SIP trunks.
My two questions are, how do we resolve the issue of pinging the .30 address from the workstation and then when the time comes how do we resolve the issue with the SIP traffic reaching the .30 address when we change the default GW of the PBX to the 10.20.0.1 address of the 2811 router.
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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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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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Mar 7, 2012
Today one of our 9 Cisco switches a "WS-C2950S" (we also got 2 other WS-C2950S on same network) stop responding icmp ping packages. When i tried to telnet the switch its network was unreachable but i was able to see its existance from other switches by "sh cdp neig". So i decided to fix the situation on a suitable night time work, checking by console cable or even rebooting the device.
Then i started to wonder... what this could possibly be about?We have like 40 clients behind that switch and there was no communication problem during the problem.
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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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May 6, 2012
I have ASA5505 configured with internal network as 192.168.15.0 and default gateway 192.168.15.1 From the inside network, i'm able to access internet and able to ping all website (enabled ping). and all internel network devices can ping each other. Except i cannot ping my gateway (ASA5505) 192.168.15.1. I'm continously seeing this message on the log, when i tried to ping.. How to fix this?
Denied ICMP type=8, code=0 from 192.168.15.xxx on interface inside
replace xxx with my network devices that try to ping the gateway..I dont want outsiders ping my gateway, i need ping for inside internal network only.
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Apr 28, 2013
I need to monitor with ping the inside sub-interface of my ASA5540, is that possible? I get the ICMP requests but no replys going out from the box.
I need to ping the 192.168.10.250 from the 192.168.5.55:
ASA Version 8.0(5)
interface GigabitEthernet0/1
nameif inside
[Code].....
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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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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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Jul 29, 2012
I am unable to see 4th interface on my firewall i.e fastether0/3 on my firewall ASA 5510.
Below is the output.
ciscoasa# sh int ip br Interface IP-Address OK? Method Status Protocol Ethernet0/0 x.x.x.x YES CONFIG up up Ethernet0/1 x.x.x.x YES CONFIG up up Ethernet0/2 unassigned YES unset administratively down down Internal-Control0/0 127.0.1.1 YES unset up up Internal-Data0/0 unassigned YES unset up up Management0/0 192.168.1.1 YES CONFIG up up
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Mar 10, 2012
I've got a Cisco 1811 router with FastEthernet0 plugged into a cable modem with 5 static IP's. I want to disable the ability for those IP's to be pinged externally except for certain addresses that I specify (I have some offsite servers that I use to monitor the ISP link for example). I also want the ability to be able to ping external addresses from the router as well as any of my inside subnets. [code]
I've tried varying ACL's and applied to Fa0, none of which work [code]
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Mar 20, 2011
Have an ASA 5510. Setting up a new DMZ zone for wireless and it will only have Internet access. What are the steps so that users on this new DMZ subnet can VPN into the Outside interface on the same ASA?
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Mar 1, 2011
I have a trouble with Cisco ASA 5510. I configured an SSL VPN with bookmarks to some application. When the users make access to the Web Portal they have to login twice: one for enter in the SSL and one for enter in the application.
How to bypass double authentication?
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Mar 26, 2013
I attached the complete config. The earlier discussion, I cannot select reply. Looks like ACL is denying it. But I am not sure which one or how to permit it.
sh run
: Saved
:
ASA Version 8.0(4)
[Code].....
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Sep 14, 2011
I would like to route traffic that are coming in and going out to the same interface on ASA. I am using inside interface with security-level 100. In this URL, [URL], ASA is able to do that.
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Oct 5, 2012
I need the ssh access on my ASA outside interface and have added
ssh ipremoved 255.255.255.255 outside access-list acl_outside extended permit tcp host ipremoved any eq 22 but this is the log i get from ASA
Oct 06 2012 16:10:04: %ASA-3-710003: TCP access denied by ACL from ipremoved/39884 to outside:ipremoved/22
Cisco Adaptive Security Appliance Software Version 8.2(5) Device Manager Version 6.4(5)
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Mar 26, 2013
I have a WAN interface and 2 LAN interface. I need both the LAN be able to access a server outside the network via the WAN (outside) interface. I am using a ASA 5510 firewall instead of a router, because I don't have a router. It looks simple enough but it does not work. I ping from the a PC (172.16.22.8) connected to LAN (inside) Network to 10.10.10.1 which is the WAN local interface also did not work. But from the ASA Firewall, I could ping my LAN (inside) PC. I followed a config i get from this forum. However, it did not work. Below my config.
interface Ethernet0/0
nameif outside
security-level 0
[Code]....
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Feb 4, 2013
I'm not clear about the capabilities of the ASA 5510 GigE interfaces (eth0/0 and eth0/1) with an without IPSEC tunnels enabled.
This page [URL] shows a figure of 170Mbps 'Maximum 3DES/AES VPN Throughput'. Does that mean per IPSEC tunnel or for the whole interface if it is IPSEC-enabled?
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Feb 13, 2012
I am having issues with the ASA 5510 management interface. I can't communicate with this interface. It is showing DOWN/DWON even if I type NO SHUT several times.
My existing config is as follows
our-asa-01# sh run
Saved
ASA Version 7.2(5)
hostname our-asa-01
names
dns-guard
interface Ethernet0/0
[code]....
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Apr 7, 2011
We recently reset a 4400 controller in a school. Although all access points associated, clients could not get the Internet. On investigating we suddenly lost connection to the web interface. We tried hyperterminal connections to reset, but found that the managament interface had the ports "unconfigured". We finally reset the configuration, and when we tried to start from scratch it now does not allow a port designation. It asks for 1 or 0 but says both are invalid when entered.
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Jun 20, 2011
On our ASA 5510 we already have one ISP link terminated on outside interface. There is correspoinding nat and global configured for outbound access to internet.
Now we need to terminate second ISP link on one of the DMZ interface to have redundancy for the primary ISP.
When primary ISP link or router is down we need to send all the traffic to secondary ISP router. How do we configure NAT and global for this condition that only when primary is down then only this NAT -Global should be used. Do we have anything like object tracking associated with the NAT-global.
So that as long as Primary RTR - object is up ASA will use the first NAT-Global pair. When primary ISP is down RTR-Object is not reachable then ASA will perform the second NAT-Global operation.
Also can we have default route pointing to Outside interface (primary ISP router) and in case of primary router failure it will point to secondary ISP. Do we have "track" in the static route commands on ASA.
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Mar 23, 2013
May I know the reason why we cannot create interface vlan on Cisco ASA 5510?
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Dec 20, 2011
FTP traffic routed from outside to the inside interface works fine. I have another interface with multiple sub-interfaces and vlans configured. FTP traffic routed from the outside to vlan2_servers is not making it through the firewall. I must be missing something. I have attached my config.
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Jan 13, 2013
Whether it is possible to have same vlan on multiple interface on ASA 5510 and higher models ?
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May 26, 2011
I am replacing an old Fw with a New ASA 5510 and I have a problem with a TCP Connection on My LAN InterfaceI joined a picture of what I want to do. [code] From the PC,I can Ping the Video Camera But I can't connect to it with HTTP.I don't understand, Packet Tracert allow the Http packet too. [code]
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Jul 31, 2012
I have little experience with firewalls, what I've learned has been by dealing with issues like this that arise from time to time.I know, I need to upgrade the version. It's in the works now. Anyways, my question/problem is: Today I've received reports of slow internet access/activity and have noticed myself that it seems a bit slow today. On the dashboard of our asa 5510 the "outside interface" traffic usage is running contstantly high. It's at the top of the graph. How can I tell what is causing the spike in utilization. It usually runs at about 1500-2000 Kbps, and now it's up over 10,000.
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Oct 25, 2012
I copied a Cisco 5510 startup-config to an identical Cisco 5510.After copying through tftp, I executed a reload. Everything looks good. Line by line compare results are the same.The problem is I can no longer use ASDM or ssh to interface with Cisco 5510.
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Apr 13, 2013
I ran into a very strange icmp ping issue. The network has been working fine other than the issue listed below, L2L VPN works fine and all three data centers can access each other via L2L VPN.I have three ASA5510. [code]
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Oct 21, 2012
I have two ASA 5510 in an active-standby cluster, not that I think that the fact that they are clustered will be of any importance here so feel free to think of it as a single 5510. The internet connection is delivered in a single RJ45 connection. To be able to use it with the cluster there is a simple unmanaged switch connected between the ISP and the ASA's. I have two subnets with public addresses, for simplicity lets call them 1.1.1.0/24 and 2.2.2.0/24. Default routers are 1.1.1.1 and 2.2.2.1 respectively.
Can I somehow use both these subnets in the ASA's? Im currently using the first subnet and use PAT to direct traffic to internal servers. But if I want to use adresses from the second subnet wont that mess up the routing, since there is no way I can specify the default router for the second subnet? I have as of yet not tried anything, Im just trying to plan ahead and I cant seem to wrap my head around how this could possibly be done.
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Jan 16, 2012
I can't move traffic (isakmp udp_port: 500 & ipsec nat traverse udp_port: 4500) from my dmz to the outside interface
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