Cisco Firewall :: ASA5505 Appears To Be Dropping Traffic For Internal Network?
Jan 10, 2013
we have a Cisco 2901 as a router on a stick for several vlans. Everything on the segment routes fine and accesses the internet just as they should. The 2901 connects to an ASA5505 on port 0/1. Any host connected to the ASA5505 can access the internet, but can not ping into any of the vlans off of the 2901. The strange thing is on either segement of the network I can ping all of the gateways. What is even more strange is when I run wireshark from behind the firewall going into the 2901 I can not see the packet on another wireshark instance behind the 2901. However if I start a ping for a host host behind the asa I can see the packet in wireshark on the host, which I am trying to ping, hit the gateway.
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Oct 25, 2012
I have a cisco ASA5505, it runs a wide site to site VPN network and has 4 servers connected to it
10.50.15.4 > fileserver
10.50.15.5 > domain controller (exchange)
10.50.15.6 > terminal server
10.50.15.7 > terminal server
Now yesterday i removed 10.50.15.6 and replaced it with a new terminal server with the same ip address, ever since the ASA is blocking traffic between it and the domain controller (example)
2Oct 27 201214:51:0510600710.50.15.655978DNSDeny inbound UDP from 10.50.15.6/55978 to 10.50.15.5/53 due to DNS Query What has me baffled is the only thing different between today and yesterday is the new server is windows server 2008 and the old one was windows server 2003. The new server has the same LAN ip address as the old one to make the changeover seamless for the users.
why all the sudden my ASA has decided to block the traffic between those machines? all the other machines can talk to it fine just not the domain controller, and seeing that this is a terminal server naturally you can see the problem i face!
this router has worked flawlessly for 2 years now without any config changes and i cant work out why its blocking traffic between those 2 machines.
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Nov 26, 2011
I am new to the ASA series and I am at a complete loss as to why I cannot configure this router to forward SMTP and RDP traffic to an internal host.
The packet trace tool in ASDM shows complete end-to-end connectivity for RDP but it still fails to connect from outside. This is my config file, what I need to change in order to make it work?
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Oct 10, 2012
I'm able to build my tunnel but unable to RDP nor ICMP back to the internal network.
VPN Client IP: 192.168.200.200
INTERNAL IP: 172.17.130.200
my configuration is below:
HOME-ASAFW02(config)# wr t: Saved:ASA Version 8.4(4)!hostname HOME-ASAFW02domain-name hsd1.nj.comcast.netenable password ViPq56cvd3SGvB08 encryptedpasswd 8bcozHCAwCqA5BmN encryptednames!interface Ethernet0/0description OUTSIDE-Connectionswitchport access vlan 2switchport protected!interface Ethernet0/1description INSIDE-Connectionswitchport protectedspeed 100duplex full!interface Ethernet0/2description WiFi-LinkSYSswitchport access vlan 3switchport protected!interface Ethernet0/3shutdown!interface Ethernet0/4shutdown!interface Ethernet0/5shutdown!interface Ethernet0/6shutdown!interface Ethernet0/7shutdown!interface Vlan1description INTERNAL-Networknameif insidesecurity-level 100ip address 172.17.130.129 255.255.255.128!interface Vlan2description OUTSIDE-Link-to-ISPnameif
[code]....
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May 28, 2012
We have an internal DNS server that all internal hosts do lookups to .. these requests are forwarded onto open dns for anything the dns server isnt authoritative for.. My question is we have purchased the botnet filter and this requires the asa5505 dns client to be active on at least one interface .. Should i point the asa dns to an external IP such as 8.8.8.8 and apply DNS enabled on interface outside ( am using asdm) I don't want the ASA to control DNS for our internal clients we already have a internal server for this, i DO want the asa5505 to check dns packets against its botnet filter, whilst still using open dns for forwarding.
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Dec 18, 2011
we have a cisco ASA5505 with base license and 3 interface configured. Internal 192.168.1.1/24 DMZ 172.16.0.1/24 Outside 20.20.20.20/24 The DMZ is configured to allow the traffic pass to the outside interface only (base license allow only traffic to one interface) in order to let clients on this network to browse internet. On the outside interface there's a nat configuration that let the port 443 to be natted to an in internal server. Is it possible to let the clients in DMZ to access to the internal server on port 443 from the outside interface?
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Apr 30, 2013
I am having an issue where the ASA is dropping packets on the vlan interfaces. I have it as a dedicated router/firewall for a 100mb connection .
Vlan1 is the internal networkVlan2 is the network to cable modem
Eth 0/1 is connected to a 2960G switch with hard coded 100mb Full Duplex at each end, this is the inside interface. Eth 0/0 is the connection to the cable modem, this is the outside interface, set at auto at both ends.
Im getting on the vlans eg. 51253 packets dropped however network traffic isnt impacted and everything runs fine, as well as 46532 switch ingress policy drops.
Example;
ciscoasa# sh int vlan1Interface Vlan1 "inside", is up, line protocol is up Hardware is EtherSVI, BW 100 Mbps, DLY 100 usec MAC address 70ca.9b36.ab80, MTU 1500 IP address 10.x.x.x, subnet mask 255.255.255.0 Traffic Statistics for "inside": 43250588
[Code]......
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Jun 21, 2012
ASA 5505 Firmware 8.3(4), ADSM 6.4(2).I have a public IP address of 168.87.3.4.I need to forward ports (5060, 5080, etc.) to one internal address. (192168.1.1).I need to foward different ports (10020-10080) to a different internal address (192.168.1.2) Everything I read tells me how to do this in a 1 to 1 static NAT.
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Jun 23, 2011
6Jun 24 201118:08:44209.85.213.5458623174.141.xx.xx25Deny TCP (no connection) from 209.85.213.54/58623 to 174.141.xx.xx/25 flags RST on interface outside I am getting this error in my asdm logs whenever I try to send an email with an attachment. Regular email go through fine. If I send a 1mb file it seems to go through after several attempts. If I send a 5mb file it might go through anywhere between 4-15 hours. It doesn't matter where I send from. Sometimes it will say ACK or RST ACK on interface instead of RST. The ASA is running 8.3.1 code. I have tried inspect ESMTP and removed it, tried sysopt connection timewait. I am at a loss.
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Jul 29, 2011
i have reviewed this configuration a couple of times and I am not seeing my error. I have two internal subnets, in different VLANs with the ASA being the default router. The internal zone works fine, but the zone called wireless on VLAN 13 doesn't. The firewall blocks all communications and the rules look correct to me. I want all traffic on this wireless subnet to be allowed to cross over the firewall and NAT to the outside interface, just as the inside zone does.
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Jan 25, 2013
I used the GUI configuration tool for this ASA 5505. When I install it no traffic passes. I am wondering to verify my config. I have masked the usernames for VPN with xxxxxx and yyyyyy. [code]
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Nov 15, 2011
I am trying to setup my very first ASA5505 and I cannot get it to pass traffic from the inside to the outside. I am not using NAT/PAT. Here is what I have done so far.
ASA5505(config)# interface Vlan 1ASA5505(config-if)# nameif insideASA5505(config-if)# security-level 100ASA5505(config-if)# ip address 33.46.132.34 255.255.255.248ASA5505(config-if)# no shut
[Code]....
Then from the asdm I permited everything from inside to go out but I cannot get any traffic through. I can ping the outside if I source the outside interface but not if I source the inside. The logs would not show me anything.
I did a packet tracer and it indicates the implicit deny rule at the end of the access-list is stopping my traffic eventhough I have allow rules above it?
I also checked the box in the asdm to allow traffic to pass without NAT
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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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Sep 3, 2012
I have an issue where my customer is only using the ASA as their firewall. When their internal users try to connect to a partner's site using a 3rd party IPSec solution it seems as if the return NAT-T traffic is being dropped. However when looking at the traffic the udp500 communication goes through, but the 4500 traffic hits the outside interface and then gets dropped.
I used the packet tracer command and the output is set to Allow. Also after initiating the vpn connection I see two udp connections (one for 500 and the other for 4500.
I cleared the asp table drop, and didnt see to see anything, I am waiting on the running config, and the customer is running ASA 8.4.
I used the capture tool on both interfaces (inside using the client ip, outside using the interface ip, both destined to the 3rd party vpn Headend). Here are the screeshots for this.
I went ahead and color coded the ip address. Green is the pre-nat inside Red is the destination for the VPN headend, and Blue is the PAT ip going out.
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Sep 13, 2011
We have an issue where by we connect to various customers and the Cisco IPSEC remote access works fine from our LAN through an ASA5505 to a customer site.We have 1 customer that we have some issues with. We can connect from the LAN through to the customers VPN, authenticate and establish a tunnel but in we cannot pass traffic. When we try from outside of the office on a public internet connection the VPN works fine. What could cause this issue?
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Mar 12, 2012
I have an ASA-5505. [code] I have an Exchange server on the 10.10.10.0 network. I need to be able to allow Active-Sync and OWA from the Guest WiFi through to the Exchange server on the 10.10.10.0 network. The Guest Wi-Fi uses external DNS so traffic is going out to the Internet and getting an IP address which is of course assigned to the Outside interface abd trying to come back in on that interface.How do I make this do what I need? How do I setup the rules to allow this traffic?
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May 15, 2012
Let me start by saying that I'm just starting to study for CCNA, so the ASA seems to be a bit above me yet. The ASA's we are using is for VPN to our corporate office and only allowing access to our Citrix environment, so no direct internet allowed. We have a person who works in the remote office who has need for a caption telephone that requires direct access to the internet. The phone only supports DHCP, and getting the ASA to do an ARP reservations is proving difficult. For now I wrote an access list to allow it's DHCP address out but it still isn't working. The access list I wrote is:
access-list 101 extended permit ip host xxx.xxx.xxx.124 any log
access-list 101 extended permit ip any any
access-group 101 out interface outside
When I do a show access-list I'm seeing that traffic is hitting the access list as the hit counter has increased. When I do a show conn I'm seeing one of the IP's that the phone should have access to, however the flags are: saA, so I'm assuming they are not getting a response. According to the manufacturer, only outbound connections are needed, no incoming ports required. All traffic is TCP.
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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
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Feb 13, 2011
I am using ASA5510 and i want to know if it is possible to redirect http traffic to an internal proxy software. I explain : PC from the LAN use a internal proxy in their IE browser but some other PC doesn't use it.They are directy connected to the Internet using the Public IP from the WAN interface ( via NAT). Can we redirected this HTTP Traffic from the WAN interface to the Proxy in the LAN ?
Http Traffic will be routed like that : PC -> WAN interface -> Proxy -> WAN interface -> Internet In fact,can we create a rule saying : All http traffic which doesn"t come from the IP Proxy must be redirected toward proxy.
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May 20, 2011
I have ASA5505 with bese-license. I like to install proxy sever in my network and i want redirect traffic to the proxy server.
Below i added configuration in my firewall.
ASA(config)#access-list wccp-servers permit ip host 192.168.6.10 any ASA(config)#access-list wccp-traffic permit ip 192.168.6.0 255.255.255.0 any ASA(config)#wccp web-cache group-list wccp-servers redirect-list wccp-traffic ASA(config)#wccp interface inside web-cache redirect in
furher configuration and if this configuration is enough, then how to check whther its working or not in my firewall.
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Jul 23, 2012
I've just bought a ASA 5505 to project my LAN. I've already use Cisco router in the past but it's the first time with ASA line.Everythings work except one major point, the return traffic is blocked by the system… I don't really understand how the zone based firewall is supposed to work but it seems OK by default, my LAN side is allowed to talk with the Internet but Internet is not allowed to directly call my LAN. The NAT is setup to use the IP of my outside interface.When I try to ping a public server, the ASA debug log show me that the communication can go out the network, with the good translation, then go back to the ASA from the public server and here, the ASA block it because the communication is not allowed.I've only found two workaround:
-allow inside trafic with static rules, and I say NO ;
-disable the zone based feature by settings all zone to the 0 level…
How I'm supposed to make my state-full firewall work with zone based feature?
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Sep 17, 2011
I have two attachments that show my basic network layout. I can get from the VPN Cisco Client to Workstation 2 just fine with my current NAT rules in place. I can also get from Workstation 2 to Workstation 3 just fine. But I'm having issues when I try to get from the VPN client to Workstation 3... What would I need to do enable to get to Workstation 3 from the VPN client? IT seems very simple to me (just PAT that traffic as I do the traffic from Workstation 2 to Workstation 3) but that does not work.
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Mar 10, 2011
I've had a Cisco ASA 5505 firewall connected to a cable modem (Virgin Media, UK) for the past 3 years. In the last 6 months or so I have noticed that the ASA would drop the outside (internet) connection intermittently, usually at least once every 1-2 weeks - the interface still shows as being up but no traffic crosses it, and computers on the inside network abruptly lose internet connectivity. Rebooting the ASA or administratively shutting down the interface and bringing it back up again would cure the problem straight away until the next time it happens.
In the last couple of days however despite nothing having been changed in the configuration the frequency of this connection drop has increased to the point where I would lose access to the internet within an hour of rebooting the ASA. It does not seem to matter whether or not there is traffic currently going out or not, inside computers just appear to suddenly lose internet connectivity.
I have tried the following without success:
1) I completely wiped the configuration (configure factory-default)
2) I changed the port the cable modem was connected to (eth0/0 -> eth0/7, changing switchport vlan accordingly)
I thought perhaps 2) had fixed it but it lasted a whole 2 hours before I woke up this morning to find that none of the internal equipment had internet access despite the fact eth0/7 was showing as up/up in ASA CLI.
This morning I manually set the eth0/7 port to "speed 10" (10Mbps, full duplex). It was previously set to be auto-negotiation (default) on both speed and duplex. As of this post it has managed to keep the outside connection up for 3 hours - but I'm not optimistic that it is fixed.
Interface counters have never shown any collisions, errors, etc - only packets input and output as expected.
Since the problem persisted across ports (eth0/0 -> eth0/7) I'm wondering whether or not the problem could either be faulty memory, or some kind of speed/duplex incompatibility between the cable modem and ASA.
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Nov 14, 2011
I'm going nuts with this ASA5505. This is a secondary firewall used only in emergencies when the primary Checkpoint failes.
The basics, it has two trusted interfaces, E0/1 and E0/2-6. E0/1, inside2 has 192.168.01/29 and inside is 192.168.200.1/24. I'd like any traffic to be allowed from inside and inside2 to outside and any traffic from the inside interfaces should be routed. No restrictions should apply between the two interfaces.
inside works just fine but no traffic is going out of inside2, not to outside or to inside.
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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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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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Feb 28, 2013
I have created a new sub-interface on our ASA 5520 for guest internet access.
My goal is to allow access to a few specific services hanging off some dmz interfaces on the same firewall and full unrestricted access to the internet only. Everything else should be out of bounds.
The order of the rules I plan to setup on the guest interface inbound are:
#1. <rules to allow access to specific services in the dmz>
#2. <block any ip access to the entire private network ip address space>
#3. <permit ip any any>
#1. These rules will give access to the guest user to services located in the dmz
#2. This rule will block all access to any services in the private ip address space (thus blocking access to all internal services)
#3. This rule is to allow access to any other services i.e. the internet.
Is this the best way to achieve my goal in the most secure way or is there a better way? i.e. is there a way to force the traffic by default to only go out the outside interface unless there is a specific rule allowing it go elsewhere?
(Of course Dynamic PAT will also be configured for traffic coming from the guest interface to the outside interface.)
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May 17, 2013
I have a ASA 5505, which has two IPSec RA tunnels build, for each one the user is able to authenticate and get an IP address is the designated IP pool, but they are not able to ping the Firewall, or RDP to any internal servers. Here is a copy of the running config:
: Saved
:
ASA Version 7.2(2)
!
hostname ciscoasa(code)
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Jul 21, 2012
We have a Cisco ASA 5505 (v7.2(3)) with a "fairly" normal configuration yet we have a problem where it appears UDP/53 traffic is denied on our inside network.
here is output from our sys log:
SyslogID Source IP Dest IP Description
305006 172.18.22.3 portmap translation creation failed for udp src inside:172.18.22.156/42013 dst inside:172.18.22.3/53
To give some clarification:
172.18.22.3 is one of our DNS servers
172.18.22.156 is a device we're experimenting with.
We've bypassed the Cisco by using a 4G wireless router with this same device - and it works flawlessly.Here is a [scrubbed] copy of our config. It is what I inherited from the previous admin - I'm not sure of all its finer points (I'm not Cisco certified -- perhaps I'm just certifiable.)
: Saved
:
ASA Version 7.2(3)
!
hostname [redacted]
[code].....
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Aug 21, 2011
A recently added outbound rule has left my SMTP communications broken. I have since removed the rule, and had Cisco do some damage control, but it's still dropping some of the SMTP traffic. I get a number of NDR messages each day like the one below:Your message did not reach some or all of the intended recipients. Subject: RE: Christopher, Curt Sent: 8/19/2011 9:38 AM The following recipient(s) could not be reached:
[URL]
on 8/21/2011 9:49 AM
Could not deliver the message in the time limit specified. Please retry or contact your administrator.
<630.SM.Local #4.4.7>
Your message did not reach some or all of the intended recipients. Subject: RE: Christopher Curd Sent: 8/19/2011 9:38 AM The following recipient(s) could not be reached: JWillar@email.com on 8/21/2011 9:49 AM Could not deliver the message in the time limit specified. Please retry or contact your administrator. <630.SM.Local #4.4.7>
I've attached an image of my configuration (ASDM GUI). The part of the image highlighted in green are the SMTP rules. The part highlighted in yellow is another rule that I added about a month ago to block a SYN attack. This rule may be part of the problem because of the order it is in the list. Not sure, though.
I have had two Cisco techs Putty into my ASA to check things out. I think they've done all they can. I wonder at this point if it be wise to just reload the last good running-config I have prior to the Outbound rule being added.
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Dec 30, 2012
I am a total Cisco novice who has just had a ASA5505 installed to replace a linux freeware firewall (smoothwall).I'm told that the 5505 can't port forward traffic (e.g. ssh) from two external IP addresses to two internal destination machines via the same port # (22 in this example).
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Sep 25, 2012
we're looking to use an ASA5505 or 5510 as our firewall but want to see if one of them can prioritize traffic. I know it does QoS but we're wanting to dedicate x amount of our bandwidth to traffic based on destination IP address. Is that possible and does it take a license upgrade?
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