Cisco Firewall :: ASA 5505 - Discarded Incoming Packets On Internal-Data0/1
Apr 4, 2013
How to best troubleshoot some errors I'm seeing on the internal interfaces of my ASA 5505. This is similar to the question at [URL], but the details are different enough that I felt it justified a new discussion.
I have an ASA 5505, running version 8.2(2), 256MB RAM. From time to time (on the order of once a week) our monitoring alerts us that both Internal-Data0/0 and Internal-Data0/1 are experiencing an unusual amount of inbound packets which were discarded with errors, up to 2.3 per second as of this post. Here is what I hope relevant output from my device:
asa# show interface ip brief
Interface IP-Address OK? Method Status Protocol
Internal-Data0/0 unassigned YES unset up up
Internal-Data0/1 unassigned YES unset up up
Vlan1 10.x.x.x YES CONFIG up up
Vlan2 32.32.32.32 YES CONFIG up up
[code]....
1. My understanding is that Internal-Data0/0 is an internal bus that connects to modules like the 4GE. I don't have any modules installed at all, as you can tell. Therefore, what is this bus doing?
2. For that matter, what is Internal-Data0/1 doing? What does it connect to?
3. I'm guessing that due to the input errors and overruns reported for both of these interfaces, it's a buffering issue. Since these are input errors, does this mean that traffic destined to this bus for forwarding is being dropped because the bus itself is running out of buffer memory? How would I see (and subsequently monitor) the buffer memory for these interfaces? Once I am able to see it, what sort of tools can I use to determine what is causing this?
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Jul 4, 2011
I can connect to it fine and access everything behind the VPN. I have a Windows 7 machine 32 bits. He can connect to the VPN just fine but not access anything behind it, he is running Windows 7 64-bits. This is not a new setup, the VPN has been working before. If I debug ISAKMP and IPSEC in the ASA I see nothing out of the ordinary. The only thing I see is that the VPN client on his machine is showing that the counter for discarded packets is increasing. This is Ciscos explanation to discarded packets. "Packets discarded—The total number of data packets that the VPN Client rejected because they did not come from the secure VPN device gateway." So it seems that the client does not believe that the packets are from the ASA. I have no idea why that would be and what could have changed that made a functioning VPN turn into a non functioning one. He can not remember doing any major installs or something like that which could mess with the client. We uninstalled the version he was using and installed a slightly newer version but it made no difference.
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Oct 2, 2011
We have Cisco ASA 5505, 90.x.y.2/29 IP is assigned to outside interface. We have one internal HTTP server so that I use static (inside,outside) tcp interface [URL] to forward all incoming HTTP traffic to internal HTTP server 1. Now we need to add new physical HTTP server 2 so that I would like to forward
HTTP traffic to e.g. 90.x.y.3/29 to 172.16.0.11.
How can I do that? See scenario image (scenario.png) if needed.
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Dec 5, 2012
Since the power failure two days ago, my -ASA stops forwarding traffic to internal servers, for no apparent reason. Packet trace shows all OK, packet capture buffer stays empty when I try to http into the mail server. The only way to get it working is to change the Outside Ip to the one used for mail, then to change it back. It will work OK for a few hours, then stop, with nothing obvious in the logs.
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Jul 15, 2012
I'm configuring this asa for to connect home users to my network using the native microsoft vpn clients with windows xp over internet.This asa have on the outside interface one public intenet ip and in the inside inferface have configured in the the network 192.168.0.x and i want to acces to this network from internet users using native vpn clients.I tested with one pc connected directly to the outside interface and works well, but when i connect this interface to internet and tried to connect on user to the vpn i can see in the logs this, and can't connect with error 800.TCP request discarded from "public_ip_client/61648" to outside:publicip_outside_interface/1723"
(running configuration)
: Saved
:
ASA Version 8.4(3)
!
hostname ciscoasa
enable password *** encrypted
[code].....
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Mar 15, 2012
I am trying to switch out a cisco pix 501 firewall with a cisco ASA 5505 firewall. I am not very familiar with all of the commands for the firewalls and have always relied on a standard command line script that I use when building a new one. Unfortunately, my script is not working with the 5505. What I am doing wrong with the following script? I've masked public IP info with xxx.xxx.xxx and I run it right after restoring the firewall to the factory defaults. I am able to get out to the internet if I browse directly from one of the servers, but cannot access a web page when trying to browse to it from an outside network. [code]
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Jun 13, 2012
I just got a Cisco asa 5505 with the next OS and ASDM info ASA 5505 OS 8.4(3) ASDM 6.47 I configured and enter all rules to allow incoming traffic to LAN but it's not working also, I have one host inside that is configured in a second IP and create the rule to allow traffic to it but it doesn't work too.
Problem 1 I have VNC running in port 5900 tcp and I want to connect from Internet using port 6001 and this has to forware the connection to the real VNC port. In the configuration I have a few host with the same configuration but I use different outside port to get it.
Problem 2. I have a second IP with services: SMTP, HTTP, HTTPS and port 444 all TCP forwarding to a server in the LAN.
Facts: SMTP. Every time that I do telnet to the second IP looking for the SMTP port, the firewall doesn't let the incoming connection goes through and the LOGGING screen doesn't how that connection.PORT 6001 (outside)this port is configured to work with the IP in the outside internface and it was to send the incoming connection to a host inside to the real port 5900.Can any one check my configuration if I'm missing anything? for sure I'm but I didn't find it. Bellow is the configuration, I masked the Public IPs just left the last number in the IP, also I left the LAN network to see better the configuration.
CONFIGURATION.
: Saved
:
ASA Version 8.4(3)
!
hostname saturn1
domain-name mydominio.com
enable password SOMEPASS encrypted
[code]....
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Oct 13, 2011
I am trying to use my WRT120n as access device for an IP Centrex service using SIP protocol. My SIP phone is located right behind the router.My problem is sometimes the router is dropping incoming calls because signalling packets are fragmented at IP level. So I cannot receive those calls.Is there a way to enable the router to accept these packets?
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Jan 3, 2012
I would like to know if I can reset the TTL value for all IP packets to 64 as they exit my network through an ASA5505 to the outside network. Can this be done on a 5505?
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Oct 20, 2012
ASA5505 port 3306.I have been fighting for days to open the port 3306 on my appliance, I have read carefully all the forums and no success.
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Feb 21, 2013
I have a Cisco ASA 5505 (version above) and I have someone that needs to SSH into a box behind the ASA. I'm having a few issues trying to configure this access-list and NAT. I've tried many combinations and clearly my IOS is not as good as I thought. What commands should I enter to accomplish mapping SSH from an outside network range to an internal host ?
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Nov 20, 2011
I want to have my port 4 on the asa 5505 only allow access to the internet and not the internal network, what do i need to do?
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Jan 25, 2012
I now need to configure an ASA 5505 for a small server farm. It's fairly straightforward:isp -> asa5505 -> internal servers,'m using static addresses -- no DHCP involved.VPN works; I can get into the internal network.pinging from the ASA to an external address works,However, I cannot get from a laptop connected to an internal port out to the internet, either using ping or typing an address in the browser.
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Feb 18, 2013
I am new to Cisco ASA and have been configuring my new firewall but one thing have been bothering. I cannot get internal networks and routing between them to work as I would like to. Goal is to set four networks and control access with ACL:s between those.
1. Outside
2. DMZ
3. ServerNet1
4. Inside
ASA version is 9.1 and i have been reading on two different ways on handling IP routing with this. NAT Exempt and not configuring NAT at all and letting normal IP routing to handle internal networks. No matter how I configure, with or without NAT I cannot get access from inside network to DMZ or from ServerNet1 to DMZ. Strange thing is that I can access services from DMZ to Inside and ServerNet1 if access list allows it. For instance DNS server is on Inside network and DMZ works great using it. [code]
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Apr 3, 2013
I am having some trouble accessing some backup Email (Outlook Web Access) and Citrix servers located behind an ASA 5505 firewall at a remote datacentre. Simply put, when I go to the specific URL (e.g. [URL]) I do not arrive at the splash page, I just get a message saying that the server took too long to respond in the web browser. I'm wondering whether I have missed something on the configuration or the firewall itself is not letting my requests through. The remote servers are located at a remote Disaster Recovery site and use the subnet 192.168.4.0/24. I am at head office which is connected to the DR site via a VPN using 192.168.1.0/24.
[Code] .....
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Jan 12, 2011
I have a client in a workgroup environment. They are a small company with perhaps twenty systems. Their infrastructure consists of a Dell Switch, a Cisco ASA-5505 which hands out the DHCP and a router. And that's that.They have been using an external IP as their DNS Server to get out to the Web. However, they now want to add an internal Linux-based DNS server.In looking through the ASA-5505 today I noticed a field for DNS enteries. Is this where the IP for this new internal DNS Server (in the secondary DNS field) would go?If so, would it be necessary to reboot the ASA-5505 for this change to take effect?
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Nov 7, 2012
We recently changed locations and acquired a new circuit from our provider. They also connected our remote branch office to our main office through MPLS. Now, as I understand it, the branch office basically connects back to the main office through our providers network (MPLS). We have a new router at the branch office which has a gateway of 192.168.1.225. The clients in that office have IP's of 192.168.1.96 - 100, using the gateway of 192.168.1.225.
The main office network is 192.168.0.0 (Gateway of 192.168.0.1)
At this end (Main office), I also have a new Cisco 2900 provided by the ISP, with port 0/0 for the outside connection (connected to the 0 port on my ASA 5505). The ASA's port 1 obviously running into my network hub. The provider tells me that port 0/1 on the 2900 is or should be used to connect the branch office back to here and has an IP of 192.168.0.225, as that's how the provider provisioned it. So, I plug that into the ASA's Ethernet port 0/2. And I'm assuming they have a route setup either on the 2900 or the router in the branch office so that 192.168.1.225 can reach me here at 192.168.0.0.
There is already a static route setup on the ASA: (192.168.1.0 255.255.255.255 192.168.0.225 1). As soon as I plug in the cable, the IP phones at the branch office work, but they can't access the internet or any resources in the main office. My questions are:
1. Shouldn't I be able to just go straight from the 0/1 port on the Cisco 2900 to my hub. At first I was plugging right into the ASA, but I don't think I need to do that, why go from the branch office through my ASA to access resources and then back out the ASA for internet. If they're already coming from 192.168.1.225, through the MPLS network, then they should go right to my network and then back out the ASA.
2. They have to route through the ASA first, in which case, do I need to setup another VLAN for that branch network in conjunction with a static route? I can ping the router and hosts in the branch office through the ASA only!
Below is the running sanitized config:
Result of the command: "show running-config"
: Saved:ASA Version 8.2(2) !hostname ciscoasadomain-name audiology.orgenable password ulzaQiFnKVzDwUmW encryptedpasswd 2KFQnbNIdI.2KYOU encryptednames!interface Vlan1nameif insidesecurity-level 100ip address 192.168.0.1 255.255.255.0 ospf cost 10!interface Vlan2nameif outsidesecurity-level 0ip address 1.2.3.4 255.255.255.240 ospf cost 10!interface Ethernet0/0switchport access vlan 2!interface Ethernet0/1!interface Ethernet0/2!interface Ethernet0/3!interface Ethernet0/4!interface Ethernet0/5!interface Ethernet0/6!interface Ethernet0/7!boot system disk0:/asa822-k8.binftp mode passiveclock timezone EST -5clock summer-time EDT recurringdns server-group DefaultDNSdomain-name audiology.orgsame-security-traffic permit inter-interfacesame-security-traffic permit intra-interfaceaccess-list
[code]....
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Aug 2, 2011
I tried the solution posted at [URL] however it did not work on my ASA5505 8.4(2). I thought that it may be because I only have a single public address so the web server is responding to port forwarding through the one public IP already. looking in ASDM it appears to indicate that a configured access list is blocking the server from responding to the internal hosts.
object network Private_IP
host 192.168.1.15
object network Public_IP
host 1.1.1.1
object-group network internal_net
[code]....
Can I fix an access list (or something) to make this work or am I wishing for too much with only one public IP? This worked by default on my Netgear firewall.
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Jun 4, 2012
I have a Cisco 5505, 2 sites that are internal, 1 external IP (dhcp from cable modem). While on my laptop, ipad, iphone, I cannot access the server via it's external IP address. I MUST use the internal IP in order to access this site. I have heard of hairpinning, internal dns server(don't really want this).
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May 30, 2013
I have an old ASA 5505, and I'm having some trouble with Nat Hairpinning. I've done this with other firewalls before and I am having no luck now. I have an internal address that I wish to forward from an external address- so if someone goes to 123.456.789.012:3456 then it will forward to 192.168.1.244:92 (All numbers are arbitrary here- only for illustration). I have and Access Rule and NAT and PAT set up so that I can get in if I originate from outside the LAN. What I am trying to do is to have this work from inside the LAN as well- so that if I am at my desk, and I connect a device and type in 123.456.789.012:3456, it will deliver the content at 192.168.1.244:92. The problem I am having is that it just isn't working, and I cannot figure out why- When I started here, there was an address configured to work this way, and it still works- I just cannot find what is different between what I am doing and what the person who configured it did.
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Aug 30, 2011
I'm usually not working with this product, but this is what I'm trying to do.I have 2 internal networks setup on our Cisco ASA 5505 firewall. (not done by me, I'm a new to this product)I'm trying to access a server on one network from a PC located on the other internal network. (preferable through the web gui)When I try "Packet Tracer" from interface "Trust4" it fails on the NAT phase.(Source ip: 10.0.4.99, Destination ip: 10.0.6.99)
When I check the NAT rule, it says:
Type Source Interface AddressDynamic any outside outside.
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Jan 15, 2012
Cisco ASA 5505 Cannot Ping Secondary Internal Network.
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Mar 24, 2013
I'm completely illiterate with Cisco appliances but I'm taking care of an ASA 5505 that is configured as a firewall and it has been working for the last years. All of the sudden we are experiencing intermittent connection problems from the workstations. You can be browsing the internet and suddently you'll get a server not found error but you refresh it and it works. This is also intermittent, out no apparent reason it will start working normally again.
I am seeing a bunch of errors like this in the logs:
4 Mar 25 2013 14:34:49 106023 66.235.119.5 69.70.15.61 Deny icmp src outside:66.235.119.5 dst inside:69.70.15.61 (type 8, code 0) by access-group "inbound" [0x0, 0x0]
[Code].....
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Oct 27, 2011
For a customer I have configured a new ASA 5505 firewall with 8.42 software. I had to build 3 ipsec tunnels to different locations and firewalls. All tunnels are working except one. I have to translate the inside network 1 to 1 to a different private range before it is sent over the tunnel. Each host from network 192.168.133.0 /24 has to be translated to a 192.168.112.0 /24 host and then sent over the tunnel. (e.g. 192.168.133.22 translated to 192.168.112.22)
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Oct 27, 2011
I have a server that I need to open up some ports on to allow access to the new internal Sharepoint server we're setting up. I've been having some issues getting the ports open like once I put the commands in and save them that server suddenly stops allowing outbound traffic. After looking at a few things I noticed while I was looking at the config file that the ASDM location is showing 2 IP's, both are the same as the server I'm trying to open ports for one being the private IP and the other is the public IP I'm trying to use. Is this the reason I'm having problems when I try to open those ports to my server? Do I need to use both a different private and public IP for this server so I can get my ports to work? The programmers selected these IP's so if I need to change them I'll let them know in case they need to make changes for the Sharepoint setup. This is on an ASA 5505.
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May 25, 2011
I have an ASA 5505 with the security plus software and I'm trying to find out how to assign 2 public IPs to the outside interface and have each IP routed to a separate internal VLAN. For example, IP 1 = X.X.X.1 routed to 192.168.1.0 and IP 2 X.X.X.2 routed to 192.168.2.0. I was told this was possible and I've been trying to find configuration examples, but I can't seem to get anywhere and now I'm getting desperate because I'm scheduled to install it this weekend.
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Dec 23, 2011
Currently I have an ASA setup as a Firewall with 1 outside interface and 2 inside interfaces. Initially, the Guest interface was setup to receive DHCP from the ASA and everything was working. I'm adding router and a server for the guest interface and what I'm trying to accomplish now is the following: ASA 5505 > Airport Extreme with a public static IP (69.xx.xx.6), handling DHCP and NAT > Mac Server as DNS Server.Right now, when I connect to my Airport Extreme with any computer, I don't have internet. I don't understand what's wrong. My DNS Server has a reserved IP address: 192.168.226.2 and it's pointing to itself and forwarding the ISP DNS servers, the Airport Extreme is handling the DNS Server IP and the ISP DNS Server IP but I can't connect to the internet from the server. [code]
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Mar 22, 2012
We have an ASA 5505 running version 8.4. We are having problems allowing external traffic to access computers behind the firewall. Our current config is:
ASA Version 8.4(3)!hostname ciscoasadomain-name default.domain.invalidnames!interface Ethernet0/0switchport access vlan 2!interface Ethernet0/1!interface Ethernet0/2!interface Ethernet0/3!interface Ethernet0/4!interface Ethernet0/5!interface Ethernet0/6!interface Ethernet0/7!interface Vlan1nameif insidesecurity-level 100ip address 10.2.1.1 255.255.255.0!interface Vlan2nameif outsidesecurity-level 0ip address 152.18.75.132 255.255.255.240!boot system disk0:/asa843-k8.binftp mode passivedns server-group DefaultDNSdomain-name default.domain.invalidobject network a-152.18.75.133host 152.18.75.133object network a-10.2.1.2host 10.2.1.2object-group network ext-serversnetwork-object host 142.21.53.249network-object host 142.21.53.251network-object host 142.21.53.195object-group network ecomm_serversnetwork-object
[code]....
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Aug 23, 2012
I have configured an ASA 5505 to connect a single internal network to internet, it is not working. I have attached the config
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Sep 10, 2012
I have a 5505 between a vendor router & my company network, vendor is not able to access devices on internal network. I am also not able to access the firewall via asdm
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Apr 23, 2012
I have an ASA 5505 with the base license,When I setup the DMZ interface I had to add the deny access to the inside VLAN. The DMZ works fine with WiFi on it, but user's iPhones can't get email unless they turn WiFi off.Is there a simple way to allow HTTPS traffic through the DMZ interface to our internal Exchange server which is NAT'd on the 5505's external IP?
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Sep 12, 2011
I have configure Cisco 5505 as layer 2 firewall mode. I have vendor machine connected to Cisco ASA 5505 on port 2 as VLAN2 inside then VLAN1 outside connected to my internal network on layer 2 cisco 2960 switch. This machine needs access only to LOGMEIN then block all internal/internet traffic.
vendor machine on vlan 2 inside >> Cisco ASA 5505 vlan1 outside >> layer2 switch >> internal LAN >> Cisco 5520 main FW >>> INTERNET
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Jul 8, 2012
I have an old ASA 5505, and I'm having some trouble with Nat Hairpinning. I've done this with other firewalls before and I am having no luck now. I have an internal address that I wish to forward from an external address- so if someone goes to 123.456.789.012:3456 then it will forward to 192.168.1.244:92 (All numbers are arbitrary here- only for illustration). I have and Access Rule and NAT and PAT set up so that I can get in if I originate from outside the LAN. What I am trying to do is to have this work from inside the LAN as well- so that if I am at my desk, and I connect a device and type in 123.456.789.012:3456, it will deliver the content at 192.168.1.244:92. The problem I am having is that it just isn't working, and I cannot figure out why- When I started here, there was an address configured to work this way, and it still works- I just cannot find what is different between what I am doing and what the person who configured it did.
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