Cisco Firewall :: ASA 5510 - Accessing Hosts Over VPN?
Oct 31, 2012
I've been attempting to fix this issue or confirm the issue is not with the firewall and I have kind of run into a road block. This is my problem as I understand it. A client of mine has a VPN tunnel built over a point to point connection of some kind (this client is fairly new to me) and is unable to access some hosts on the remote end of the VPN tunnel from the LAN side of the firewall. The LAN IPs are NAT'd as they leave the network from the HPH-Point-to-Point interface to the remote end. Just as a point of reference, the LAN IP of 129.200.11.19 is said to be working, however the range of 129.200.20.25 - .50 is not. I've tried packet-tracer but with the NAT happening over a VPN tunnel I am not sure if I am doing it correctly.
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Dec 10, 2012
I have just started to use an ASA 5510 for my network. I use the DHCP server on it and after i made the change over to ASA hosts started loosing their IP address. This was not a problem before on my old firewall that aso had the roll of DHCP.
Is it possible that something is wrongly sett on the asa? All traffic is flowing normaly when this does not happen.
Information:
Lease length: 172800
address pool: 134 addresses
hosts: around 45 + mobile units 45
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May 22, 2011
This is an issue I'm currently exploring with TAC, but I'd like a quick reality check. We have a pair of ASA 5510s in Active/Standby stateful failover mode. In some tests failing over from the active to the standby system breaks SSH connections from hosts on our Inside to hosts on our DMZs.
A specific example is our backup server on Inside which is connecting to our mail server in the DMZ2, and running ssh/rsync/scp for the backups. A running backup job fails with network timeout errors when I trigger the failover. Also, sometimes the mail server loses or hangs on its connection to our LDAP server in DMZ1, although sometimes this connection is fine (DMZ2 is more "inside" than DMZ1, and I assume the LDAP look ups are many short connections, vs the rsync backup being one long connection).
TAC has suggested that open SSH sesions will always fail when the ASAs failover. I believe this is true for management connections to the ASA, but I don't see why it should be the case for an SSH session through the ASA to a server in the DMZ. TAC has suggested that I open some connections to servers in the DMZ and test what happens, and I can do so this Wednesday morning during a maintenance window.But, in general, is this true? That is, given an SSH session from a workstation to a server, should a failover break it? If so, why?
The setup is:
MyWorkStation-INSIDE -> CoreSwitch (vlan 10) -> [ ASA-INSIDE - - (ASA-internal-connection) - - ASA-DMZ ] -> CoreSwitch (vlan 3) -> TargetServer
That is, all our inside VLANs are routed by our core L2/3 switch to a VLAN that connects to the Primary and Secondary ASA's INSIDE ports. There are also seperate VLANS on the core for the ASA's DMZ1 and DMZ2 connections, which go to both ASAs and to any servers in these zones.
The description of the ASA Stateful failover [URL]says: "The state information passed to the standby unit includes these:
· The NAT translation table
· The TCP connection states
· The UDP connection states
· The ARP table
· The Layer 2 bridge table (when it runs in the transparent firewall mode)
· The HTTP connection states (if HTTP replication is enabled)
· The ISAKMP and IPSec SA table
· The GTP PDP connection database
[code]....
I'm not quite sure what the ISAKMP and IPSec SA tables do, but shouldn't an SSH connection through the ASA be just a TCP connection? "For us, SSH from Inside to hosts in the DMZ survives failover," or, "Yah, failover breaks all SSH sessions."
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Dec 4, 2011
I have an ASA 5510 which i've configured for internet access.I can connect to the internet from the ASA box,I can ping public networks from the console of the ASA box,but cannot access public hosts from internal hosts connecting via the ASA box.Find my config below to know what i ahave omitted or committed.
[code]...
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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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Dec 20, 2012
I have an ASA 5510 deployed and we are getting a tonne of port scanning traffic (who isn't these days) and ping traffic.The threat scanning thresholds seem a bit too high and was wondering if there is a way to use a Service Policy Rule to perform a Shun/Block of the hosts rather than the firewall simply blocking the request via the ACL and sending a reply.
In other words, if I do nothing, I know the ACL is protecting the resources but it is still replying to the client connection. I want the end result to be the same as a "Shun" where the connection is dropped and no reply is sent. how to employ Service Policy Rules to thwart Port Scanning and/or IP Spoofing?
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Jun 11, 2013
I could access from outside to dmz but after i moved to IPv6 as there is no nat needed, i applied the acl's but dont know where i'm going wrong. I need access from outside to dmz web server.
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Nov 19, 2012
Is this possible and if so what commands do i need to configure on my ASA 5510 for it to work.I have two web server within my DMZ and i want to access the outside url of on on the web server from the other. Currently i can access the internet from both webserver server but not the url form either webservers.
E.g. config
webserver 1 https://xxxxxx.xxxxxxx.com ---> public ip---> dmz ip
webserver 2 https://xxxxxx.xxxxxxx.com ---> public ip---> dmz ip
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Oct 11, 2012
I have an issue with my mail server(SME Server) which is behind a Cisco ASA 5500(firewall) problem is that if one leaves my network they can receive but can not send email via my SMTP also internal people can only send if they use the IP address of the server rather than the domain [URL]
here is my layout
ISP - ASA 5510 - LAN (includes mailserver)
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Apr 2, 2012
Trying to figure out how to configure the VPN client side to access a remote LAN.
Lan A - 172.16.17.0 - ASA5505 8.2(3)
Lan B - 200.200.0.0 - ASA5510
Cisco Client - V5
At present there exist a VPN tunnel between LAN A and LAN B. The client has a VPN tunnel to LAN A to run software package X on the LAN A server. The client also needs to run software package Y which needs access to a database on LAN B. The computers on LAN A have no problem using package Y since a VPN tunnel exist between LAN A and LAN B. How can I get the Client to also access LAN B on the same tunnel created when the client connects to LAN A? I can't seem to get packets that are directed to LAN B to cross the Client tunnel to A which would then hopefully move onto the LAN A/ LAN B tunnel.
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Nov 13, 2012
Seems like something simple, but can't find on Cisco.com. What are the max SNMP hosts allowed on an ASA 8.2 code? That would be Polls and Traps?
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Dec 17, 2012
I am trying to configure access to several remote offices for users who VPN into our main datacenter. The datacenter has a 5520, and the branches are connected through IPSec L2L VPNs. Branches all have 5505 or 5510's. Remote users use IPSec via the Cisco remote Client. Remote access into our data center works, and the L2L VPNs are perfect...just now that i need remote users to access the branches after Remote access VPNing (for support) i cant get that part to work.
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Jun 8, 2013
I am struggling to get successfull pings beween asa and inside hosts but couldn't succeed. Done packet tracer result is acl-drop
Here is the running config
Prem-ASA(config)# sh run
: Saved
:
[Code].....
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Sep 24, 2012
I'm testing upgrading an ASA from 8.2.5 to 8.4.4. During the the upgrade, it change all of my ACL host entries to objects. But I noticed that the keyword "host" is still a valid option when creating an ACL.
I'm trying to understand why this change is made during the migration.
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Nov 21, 2012
ASA is running 8.4.
Internal interface: 172.16.1.1
External interface: 172.16.2.1
Routing to 192.168.0.0 via internal host.I've got some static NATs, e.g:
object network obj-192.168.0.1
nat (inside,outside) static obj-172.16.2.1
object network obj-192.168.0.3
nat (inside,outside) static obj-172.16.2.2
I also want in internal NAT, but only for certain external hosts, so when they connect to any of the above, their source address is changed. I've attempted the following so an external host (172.16.2.254), has it's source changed to 172.16.1.100.
nat (outside,inside) source static obj-172.16.2.254 obj-172.16.1.100
But it's source remains unchanged.What am I missing?
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Feb 18, 2012
The ASA5505 I am working with has this from the show version:
Licensed features for this platform:Maximum Physical Interfaces : 8VLANs : 3, DMZ Restricted Inside Hosts : 10Failover : Disabled VPN -DES : EnabledVPN-3DES-AES : Enabled VPN Peers : 10WebVPN Peers : 2Dual ISPs : Disabled VLAN Trunk Ports : 0
This platform has a Base license.
Does the Insides Hosts :10 line mean that only 10 devices can be connected to the firewall at one time? I would like to connect an AP to one of the PoE ports and have possibly more than 10 connected. Is this possible with this ASA5505?
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Feb 9, 2013
I have configured the ASA in a very similar manner to how the PIX was set up but I'm having trouble with some hosts on the inside accessing the Internet. Any inside hosts which use DHCP work fine. Any inside hosts with a static IP (and configured on the ASA with a "static" rule) cannot access the Internet. For example, in the config below the server daviker-dialler cannot access the Internet. I've spent a few days working on this now and have started from scratch several times but I'm not getting anywhere. Apologies for all the X's everywhere, didn't like to post anything sensitive on the Internet.
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May 16, 2011
I am using a three interface ASA config (Internet, DMZ, Inside). The DMZ and Inside networks are both RFC 1918 space however it is against our corporate policy to allow our DMZ IP space to be internally routable, therefore we must target routable IP's which NAT to the DMZ hosts . In my DMZ network there are two devices - a Web Server and a 802.11 Access Point.
The Web Server is hosting our corporate web site. When the clients accessing the internet via the Access Point try to access our corporate web site they are not able to. A DNS lookup of the A record 'www' returns the public IP address, which when targeted translates to the real RFC 1918 IP of the web server.
Is there a way to use destination NAT or another clever config so when a host targets a public IP which is being translated on a different interface right back into the same interface it originated from it would allow the traffic?
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Aug 17, 2011
I want to upgrade "inside hosts" from 10 to unlimited on a ASA5505-BUN-K9, Do I have to buy Security Plus license ( L-ASA5505-SEC-PL =) ) before activating ASA5505-SW-10-UL ?
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Jun 19, 2011
How can I get DMZ hosts to be able to access the Internet via the Outside interface of my ASA5505.I am using the DMZ to allow temp guest acces to the Internet.
Here is my configuration and it can be changed as needed.
User Access Verification
Password:Type '?' for a list of available commands.ciscoasa> enaPassword: *******ciscoasa# sho run: Saved:ASA Version 8.0(4)!
interface Vlan1nameif insidesecurity-level 100ip address 192.168.100.39 255.255.255.0!interface Vlan8no forward interface Vlan1nameif dmzsecurity-level 50ip address 172.31.10.1 255.255.255.0!interface Vlan11nameif outsidesecurity-level 0ip address 24.172.82.xxx 255.255.255.252!interface Ethernet0/0!interface Ethernet0/1switchport access vlan 11!interface Ethernet0/2!interface Ethernet0/3switchport access vlan 8!interface Ethernet0/4!interface Ethernet0/5!interface Ethernet0/6!interface Ethernet0/7!boot system disk0:/asa804-k8.binftp mode passivedns server-group DefaultDNSdomain-name asaobject-group protocol DM_INLINE_PROTOCOL_1protocol-object udpprotocol-object
[code]...
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Apr 25, 2011
I am using ASA 5505 firewall with base-license. I connected my firewall to one cisco 3750 switch where i created 5 vlans. I done NATing for all vlans and they able to get internet and working fine. They able to browse all internet sites like gmail and yahoo mail.
All internal users are configured to use Outlook for their webmail. Here the problem is with outlook they are unable to send and receive the mails.
If they directly connected their system using public ip( Directly from ISP) they able to send and receive mails from outlook.
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Jun 19, 2011
Is it possible to configure the ASA to:
log syslog informational to one host
and
log syslog critical to a different host
It seems that the ASA allows you to only specify 1 logging severity level for all syslog hosts..
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Jul 24, 2012
I have, what I believe to be, a simple issue - I must be missing something. Site to Site VPN with Cisco ASA's. VPN is up, and remote hosts can ping the inside int of ASA (10.51.253.209). There is a PC (10.51.253.210) plugged into e0/1.
I know the PC is configured correctly with Windows firewall tuned off. The PC cannot get to the ouside world, and the ASA cannot ping 10.51.253.210.
I have seen this before, and I deleted VLAN 1, recreated it, and I could ping the local host without issue. Basically, the VPN is up and running but PC 10.51.253.210 cannot get out
ASA Version 7.2(4)
!
hostname *****
domain-name *****
enable password N7FecZuSHJlVZC2P encrypted
[Code]...
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Aug 26, 2012
I've got an RV180W for my office, and so far it has been great. I have two users that use a certain application that crashes all the time. For some reason, they don't crash when put into the DMZ. Is there any way i can put both of them in the DMZ? I can only figure out how to have one host in the DMZ at a time.
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Jun 22, 2011
I'm stuck at asa 5505 nat, port forwarding configuration Here is what i need:
host1: 192.168.1.1 service tcp/100 >>>>> public ip 1.1.1.1 service tcp/100
host2: 192.168.1.2 service tcp/200 >>>>> public ip 1.1.1.1 service tcp/200
host3: 192.168.1.3 service tcp/300 >>>>> public ip 1.1.1.1 service tcp/300
So people from remote just need to use 1.1.1.1 public ip to access all the ports on three different inside server.I can do this on my old ASA 5505 with 8.0(4). Looks like there're lots of change from 8.0 to 8.4.
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Feb 14, 2012
At the end of the day I simply need to upgrade the license on my ASA 5505 v7.2.4 (upgrade will come later as part of a larger project) to allow for >10 Inside Hosts. From what I've read there seems to be a 50 license upgrade out there. Can this be purchased directly? From whom? Will it only affect the Inside Hosts number and not affect any other licenses, configurations, etc. Just being overly cautious since this is way outside of my normal realm. Below is the current activation-key information....
Result of the command: "show activation-key"
Serial Number: xxxxxxxxxxxxxx
Running Activation Key: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Licensed features for this platform:
Maximum Physical Interfaces : 8
VLANs : 3, DMZ Restricted
Inside Hosts : 10
Failover : Disabled
VPN-DES : Enabled
VPN-3DES-AES : Enabled
VPN Peers : 10
WebVPN Peers : 2
Dual ISPs : Disabled
VLAN Trunk Ports : 0
This platform has a Base license.
The flash activation key is the SAME as the running key.
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Oct 25, 2011
I'm migrating our network objects from our current firewall to a new ASA 5520 configuration. I'm using ASDM 6.4 for configuration.
We have a range of IP addresses for hosts that we need to add to a firewall rule/ACL. In the previous FW software I could create an object that was a range of IP address. For example there is an object called emailservers that is defined as 192.168.2.25-192.168.2.50.
Is there a way to do a similar thing on the ASA 5520?
I can see how to create subnets, but in this case I only have a range of IP addresses, no subnet mask.
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Jul 26, 2011
I've just taken over a new network with a Cisco ASA5520. Everything is working fine, except I am being bombarded with 106001 alerts from a few internal hosts to one specific internal host. The description in general is "Inbound TCP connection denied from 10.1.0.1 to 10.1.0.5 - both of those are valid internal hosts and the TCP ports are also valid. I tried looking at the log and getting it me to tell me which rule was causing these alerts, but it just came back with 'It's not possible for these type of alerts'
- How is it possible for the ASA to even pick up on this when, in theory, the source host wouldn't be going near the ASA since it's on the same subnet?
- What might be causing this?
- How can I turn it off!! (I guess that'd be fixed by point 2)
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Mar 7, 2012
We have an ASA-5505 running 8.2(1) with a Bosch DVR 600. When a machine is on the local subnet, it can see the video; however, when it's moved to the DMZ, the unit can be accessed, but all video screens are black and an java script error pops up as follows: [URL]
This message does not pop up when on the local subnet. Additionally, in the login screen, there is a language selection, and sometimes all languages are blanked out. There is a space for them, but they don't display.
I've tried this on a half a dozen machines, either XP or Win7 with IE8 and IE9, and they all do the same thing. I disabled http inspection, but that doesn't work. I also did a packet capture, and the only packets that traverse the ASA.
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Aug 6, 2011
I get stuck in a problem,What can be the reason for not working my configuration or any other reason that can be .
[CODE].....
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Dec 4, 2012
I want to access my ASA 5505 from internet.how I can achieve it.
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Mar 14, 2013
active# sh running-config
: Saved
:
ASA Version 8.2(5)
!
hostname active
domain-name dhalahore.org
enable password 2KFQnbNIdI.2KYOU encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
[code].....
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Aug 16, 2011
We have a ASA5510 with a webserver in the DMZ network 10.2.2.0/24. We now want this web server to be able to access the Exchange server in the Inside network 10.1.1.0/24. I researched this and it seemed straight forward according the the Cisco document below:
[URL]
I'm looking to do this with smtp so I added these lines to the config:
static (inside,DMZ) 10.2.2.30 10.1.1.11 netmask 255.255.255.255
access-list dmz extended permit tcp host 10.2.2.2 host 10.2.2.30 eq smtp
The configuration line:access-group DMZ in interface DMZ Already existed in the configuration so didn't need to be re-entered.
ASA Version 8.0(4)
!
hostname xxxx
domain-name xxxx.com
enable password xxxxxxxxxxxx encrypted
passwd xxxxxxxxxxxxxx encrypted
names
[code]....
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