Cisco WAN :: ASA 5510 / Forcing Inside Interface To Go Out Backup ISP?
Nov 12, 2012
We have a 5510 and I have a second ISP setup for a backup link. We have 4 ports connected to 4 different internal subnets. I want to force one of the ports to use the backup ISP link at all times. I'm having a little problem with where I need to make the changes in my ASA.
Interface "outside" is my main ISP
Interface "building3" is my backup ISP.
I want to force the "Guest" network to use the "building3" link for all traffic. Here's a snippet of my config
global (outside) 10 interface
global (building3) 10 interface
nat (inside) 0 access-list nonat
nat (inside) 10 0.0.0.0 0.0.0.0
nat (Guest) 10 0.0.0.0 0.0.0.0
[URL]
Do I need to change the global pool or create a new one? I have a couple free public IP addresess on the building3 subnet I can use for a pool.
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Oct 16, 2011
I have a asa 5520 with an outside and backup interface. I am trying to configure two static nat statements from the inside to the outside and backup interface. Here is what I have configured so far.
object network obj-10.1.1.254
host 10.1.1.254
object network obj-10.1.1.254
nat (inside,outside) static 172.25.10.3
I want to also use nat (inside,backup) static 172.25.10.3
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Dec 9, 2012
I have an ASA 5510 running 8.4 with dual ISPs setup on 2 different interfaces: outside(primary),backup(backup). I also have a site to site VPN to another ASA in another city. The VPN is now setup on the outside interface and works fine. What I wanted to do is to make the VPN run over the backup interface only.
So, I modified the the crypto map on the remote side to use the backup interface IP and created a tunnel-group for it. I then created a crypto map for the backup interface and enabled ikev1 on it. The default route is set to use the outside interface so I created a static route that routes traffic bound for the outside interface on the remote side to the backup interface default gateway. I can get the tunnels to establish but no traffic is passing through them. I though then that I need a NAT for the tunnel traffic to I created a NAT as well but still no traffic passed. I tried the packet-tracer and it said the traffic was allowed and from the show crypto ipsec sa command I can see the tunnel setup but no traffic will go across it.
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Sep 19, 2012
I have recently installed an ASA5510 at a site in South Africa to connect via VPN to a site in the UK (ASA5520). The VPN comes up fine with the 5520 in the UK, however, I can not connect to the inside interface over the VPN, but can access it from the internal LAN. All other hosts on the LAN are accessible over the VPN.
The 5510 also has another VPN to another site in SA and the 2nd site cannot ping the interface either.
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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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Feb 5, 2012
i have here a ASA 5510 sec k9.
I build a Config with a DMZ,INSIDE and OUTSIDE Interface. My Plan is to use the IP-Address of the OUTSIDE Interface with PORT to setup a HTTP Server In the DMZ
But my Config doesn't work. And I have no Plan why .....
The Inside Interface have to work normal. The Traffic to the Internet is TRiggert from Inside with Dynamic PAT
ciscoasa(config)# exit
ciscoasa# show run
: Saved
:
ASA Version 8.4(1)
[Code].....
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Apr 4, 2012
The ASA is configured in very simple transparent mode. As desired, traffic can flow in each direction between inside and outside. I can manage the ASA via console and direct connection to the management interface. The problem is that I cannot ping or ssh to the ASA via the inside interface. I need to be able to manage the ASA from any PC on the inside LAN. I suspect I am missing some easy aspect of the configuration but after a lot of hours I'm about at the end of my patience with it. Here is what I believe to be the relevant parts of the config.
ASA Version 8.2(1)
!
firewall transparent
hostname issr1
enable password 2alej83t5cqT0FWd encrypted
passwd 4kleUY438I93.4ljdh encrypted
names
[code]....
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Jun 28, 2012
we have a server that has an outside IP and an inside IP. It's inside ip is 192.168.222.30/24 and it's outside IP is 199.204.50.2/29. The connection to this server from the outside is perfectly fine, but access from inside users to the NAT'd IP which is 199.204.50.2/29 is having issues, however, access to the inside IP works fine (this part makes sense)Will It be a must to set the inside DNS A record to the inside IP and not the outside IP, or can users on the inside interface access the NAT'd IP which is assigned to the server
LAN(192.168.222.0/24)<=====>InsideASAOutside<=====>(Server with NAT IP 192.168.222.30/24, it's also physicall assigned to this server).This is an ASA 5510 with 8.4.
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Jan 3, 2012
so i have a ASA 5510. The ASA is Connect with the Internet through PPOE DSL MODEM
The outside Interface get an IP. The Inside Interface get through DHCP from the ASA the Internet DNS SERVER (T-Online) But the HOST do not connect to the Internet because the DNS Server is timed out
Code...
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Apr 5, 2012
We've had issues with our Exchange 2010 server (running on ESXi 4.1) since its default gateway was changed to our new ASA 5510. They manifested as frequent Outlook client connection dropouts or as IP address conflicts whenever Exchange was rebooted. The temporary fix was to disable the Exchange server NIC, bounce the ASA and enable the server's NIC again. We saw poor performance from Exchange after a while again, but after some research and testing I realised that disabling proxyarp on the inside interface fixed the problem permanently.
However I've now realised that the client VPN no longer routes properly because proxyarp is disabled on the inside interface, so I still have a problem.
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Mar 8, 2011
I have setup two different subnet 192.168.1.0 and 192.168.2.0 on the same 'inside' interface. They are unable talking to each other. I can ping from firewall to both subnet. Both side unable talking to each other unless I add route on the both side systems.I have added the followings in ASA5510. [code]
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Feb 28, 2013
My internal network consists of Catalyst 3750 switches segmented into different VLANs. There is a default route on the layer 3 Catalyst switch sending all unknown traffice to the inside Internet of the ASA 5510. However, I'd like to have a separate VLAN for wifi guest access and send all of that traffic through one of the DMZ interfaces on the ASA 5510. I don't think you can have separate default routes based on VLANs on the 3750 switches so my only option is to make the ip address of the DMZ port the default gateway for all hosts on the wifi guest VLAN.
The problem I have is that I have a couple servers behind the inside interface that have services available to the public Internet via a NAT address on the outside interface. I want the guests on the wifi VLAN to have the ability to access the servers on the inside interface using the public address as well, but have not been able to come up with a solution yet.
Here is my config that pertains to this setup:
interface Ethernet0/0description Outside Interfacenameif Outsidesecurity-level 0ip address 76.47.10.x 255.255.255.224 rip send version 1rip receive version 1!interface Ethernet0/1description Inside Interfacenameif Insidesecurity-level 100ip address 192.168.17.1 255.255.255.0 rip send version 1rip receive version 1!interface Ethernet0/3description Wifi Guest Accessnameif DMZ2security-level 50ip address 192.168.60.1 255.255.255.0
global (Outside) 1 interface
nat (Inside) 0 access-list nonat
nat (Inside) 1 0.0.0.0 0.0.0.0
nat (DMZ2) 1 0.0.0.0 0.0.0.0
static (Inside,Outside) 76.47.10.x 192.168.17.88 netmask 255.255.255.255
I've tried the following commands below but no dice.
same-security-traffic permit intra-interface
static (inside, inside) 76.47.10.x 192.168.17.88 netmask 255.255.255.255
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Mar 6, 2012
How to force traffic back out the same interface from whence it entered. Review the following topology.
Internet ---> ASA 5510 ---> Static IP1 ---> F3.1 ---> 1811 F0
|-------> Static IP2 ---> F3.2 ---> 1811 F5 ---> VLAN Int
ASA F3.1 10.1.254.9/30
ASA F3.2 10.1.254.13/30
1811 F0 10.1.254.10/30
1811 F5 10.254.1.14/30
When pinging the public IP of ASA F3.2 from the internet a reply is never received because the default route on the 1811 points to ASA F3.1.
How do I get the replies from the 1811 to go back out the same interface from whence it entered ? I am sure the answer is policy-based routing, but not sure how to write the config.
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Apr 23, 2012
My setup has two firewalls to the internet, one is for all internal users who want to access the internet and the other is an ASA5510 acting as VPN terminaton to remote workers accessing using Anyconnect.
Each of the firewalls has a public interface on the same network (ex. 196.160.100.192/26).
We have a server with a public interface, and all traffic (internal and external) has to access via the public ip (again in the same network as above) and there are different profiles and access levels on that server depending if you are accessing from an internal IP or a public IP.
Well, when users are connected thrugh the VPN, although they have an internal IP address, as they are accessing the server on the public IP, the ASA sends the packets through its external interface (direct connected route) instead of sending it to the default internal gateway that is a "trusted" entry point on the server.
Any way to force the ASA to send that traffic to the internal default gateway instead of sending it to the external (direct connected) interface?
I have no access to the server (appliance under warranty) so I can't make any changes to it...
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May 1, 2012
I have a Cisco ASA 5505 and I have my internal and external interfaces configured but I currently cannot ping from the inside to an IP Address on the outside. I had this setup and working and I have another set of equirement that I am replacing that is working with my service provider so I know it is a configuration issue. When I ping 4.2.2.2 for example I get:
Destination host unreachable
Do I need to add a static route from my inside interface to my outside interfaces?
: Saved
:
ASA Version 8.2(5)
!
hostname pxasa
[Code].....
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Oct 9, 2011
I have Pix 501 firewall and I'm just configuring the device for "Email Server" to allowing POP/SMTP.
Inside Interface Address: 132.147.162.14/255.255.0.0
Outside Interface Address: ISP provided IP address
My question is can my traffic goes from inside interface to outside interface? (because the inside interface address not from 10.0/172./192.168 private address)Also I'm allowing internet from this email server (132.147.162.14) so what my access list to be configured? and what my subnet mask shoud be there?
Pix(config)#access-list outbound permit tcp 132.147.162.14 255.255.0.0 any eq 80
Pix(config)#access-list outbound permit udp 132.147.162.14 255.255.0.0 any eq 53
Pix(config)#access-group outbound in interface inside
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Sep 25, 2011
I have a PIX-525 with an UR license. I was trying to get my VPN to work from my iphone over the weekend but to no avail. I then changed the interface to the inside to see if my iMac could connect and bingo! It worked. I then tried to connect via inside interface with my iphone and it worked.
I connected a PIX-515e and, using the same settings, can connect to the outside interface via my iPhone.
Now, to answer the pressing questions, yes I changed the server IP address in my IPSEC client settings to reflect the outside and inside interfaces as I was testing each one. I was using a preshared secret. Yes, the secret was entered correctly and they all matched...yes, the tunnel name was entered correctly. I was using local user database for authentication with username/password (i.e. no certificate authorization to make things simpler for debugging). I changed the syslog to debugging and I see absolutely no errors when trying to connect my iphone to the outside interface (i.e. turning wifi off so I'm on my 3G data network). The only thing I see is where my iphone hits the outside interface and it does a teardown (or whatever its called) but that's it.
Why would this work like a charm with my PIX-515e and not my PIX-525? Could the VPN accelerator card in the 525 be at fault? The 515e does not have the aecellerator card. why I can esablish a VPN connection on the inside interface but not the outside?
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Jun 20, 2011
Does backup interface is supported on ASR?
interface GigabitEthernet0/2/1
description 3750_Stack_1
backup interface GigabitEthernet0/2/2
ip address 100.50.50.242 255.255.255.248
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Nov 21, 2011
I have setup ASA 5505 with 2 ISP, named outside (primary) and backup, the scenario is if outside down, then backup will take over, it works now. But it is not working when the primary connection cannot reach the gateway with the interface still up.
Is it possible when the primary connection cannot reach the gateway then backup automatically take over?
My configuration is:
ASA Version 8.2(1)
!
hostname cisco
[Code].....
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Sep 2, 2010
I have a problem in configuring two pair of backup interface on my customer's router (3845). It's ok when I configure just one of them. If I configure both pairs of interfaces into backup interface, one of them will be in disabled mode, as shown below :
WANR01#sh ip int bri
Interface IP-Address OK? Method Status Protocol
GigabitEthernet0/0 172.16.199.106 YES NVRAM up up
GigabitEthernet0/1 172.16.3.5 YES NVRAM up up
Serial0/0/0 unassigned YES NVRAM administratively down down
Serial0/0/1 unassigned YES NVRAM administratively down down
FastEthernet0/1/0 125.213.133.186 YES NVRAM standby mode down
FastEthernet0/2/0 172.112.22.6 YES NVRAM standby mode/disabled down
FastEthernet0/2/1 123.231.177.238 YES NVRAM up up
Loopback0 172.16.199.12 YES NVRAM up up
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Jul 8, 2011
I currently have an out of the box ASA5505 and need to change the internal interfact from 192.168.1.1 to 10.20.3.1 so it fits in with the rest of the network.Tried using the ASDM Startup wizard (via 192.168.1.1) and it just seems to hang on "delivering the commands to the device".
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Jan 17, 2013
I am trying to upgrade a Cisco ASA over an IPSEC VPN tunnel. My FTP server is on the remote side of the VPN tunnel but I am initiating connections from the inside interface of the firewall. I am currently managing the Firewall over the VPN via it's inside interface (using the management-access inside) command. When I try and update via FTP, the connection is going straight out the outside interface (and not across the VPN tunnel) I have tried upgrading via TFTP but it keeps stopping randomly with (unspecified error) I normally upgrade via FTP though but it's not working in this instance. Essentially what I am asking, is is there an equivalent command for FTP that there is for TFTP: tftp-server interface ip anyconnect I need the connections to originate from the inside interface so they traverse the VPN. I am running 7.2.3?
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Aug 18, 2011
We currently have a setup where users connect to the inside of a firewall using the ipsec client. We are moving them to the anyconnect client but are unable to get it to work, we cannot even get a webvpn page on the inside.
When trying to connect with anyconnect the ASA reports an IKE initiator fail on the inside. and no tcp connection flag. We cannot get any response with Webvpn either I have tried using a different tcp port on webvpn but then the asa denies the traffic even though there are no rules denying.
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Jan 18, 2011
I have two 3750 switch.switch A(main) and switch B is connected by OFC but i have another wireless link for backup.Now if OFC goes down then i manually connect wireless link with switch B for this reasons i am faceing a lot of problem. I want without any changing of cable if my primary link goes down then my backup link automaticaly goes up and vice versa .
Switch-A port gi1/0/9 and Switch-B port gi1/0/9 is connect by OFC Switch-A port gi1/0/8 and Switch-B port gi1/0/8 is connect by Wireless link (backup) i attach my network diagram kindly find the attachment file.
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Sep 8, 2012
Since WLC5508 MGMT interface is configured a AP-Mgr at the same time, can I set a Backup Port to WLC5508 MGMT interface? Refer to WLC configuration Guide:
In the Backup Port text box, enter the number of the backup port assigned to the management interface. If the primary port for the management interface fails, the interface automatically moves to the backup port.
Note Do not define a backup port for an AP-manager interface. Port redundancy is not supported for AP-manager interfaces. If the AP-manager interface fails, all of the access points connected to the controller through that interface are evenly distributed among the other configured AP-manager interfaces
if I need to configure the backup port for MGMT interface, i need to remove the AP-manager on MGMT interface and create a network dynamic interface for AP-Manager ?
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May 10, 2011
I have a new ASA 5505 and all is working fine, I can CLI and ASDM into it, but just can't ping the inside interface, do I need to enable a feature to make this work somehow?
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Apr 23, 2012
I am connecting the inside interface to an upstream switch and therefore will need to assign a static IP address to the inside address as I did below:
#sho int ip brief
Vlan1 123.123.123.123 YES manual up up
I will also use this to manage the ASA. I am having a problem with the network configuration of the inside interface as I can't ping the gateway and/or the in IP of the inside interface.Do I need to add any routes?
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Jun 7, 2013
I have a Cisco 5512 x Firewall connected with Cisco Layer 3 switch 3750.I have two different WAN connections, one for Data and one for voice. Cisco Layer 3 switch is configured with 2 different VLAN's one for data & other is Voice Vlan. Switch is providing DHCP to computers and IP phones. Voice Pool 192.168.10.0/24 Vlan10 and Data pool 192.168.20.0/24 Vlan20.I need to route my data & voice traffic separately. Cisco ASA is connected with two different ISP's. So, how can I do this configuration so that Voice and Data traffic will route separately.
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Apr 24, 2012
the inside interface on our primary ASA seemed to "hang". It dropped all the packets it received. Because the interface didnt go down, failover didn't happen. Device's info;
-Cisco Adaptive Security Appliance Software Version 8.2(3)
-Device Manager Version 6.3(3)
-Hardware: ASA5550, 4096 MB RAM, CPU Pentium 4 3000 MHz
-Internal ATA Compact Flash, 256MB
-BIOS Flash Firmware Hub @ 0xffe00000, 1024KB
I attached a capture picture shows that traffic didnt go to the roof when the issue happened. Why the interface would "freeze" randomly?
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Dec 12, 2011
I have an ASA 5505 that I'm trying to set up a guest network on. I've configured an interface as a trunk and allowed the 2 vlans but I'm not getting any layer 3 to it. The switch connected to it is a 3560 and port is configured as a trunk with the same vlans.
I can't ping the ASA inside interface but I see its MAC address in the swtich's table.
[code]....
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Mar 7, 2012
I'm trying to NAT SIP registration from OUTSIDE interface to Inside interface on ASA
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May 13, 2013
I did this on the PIX and it worked like a charm, but I am having some difficulty translating the configuration to an ASA.
In the PIX I performed NAT on outside traffic to a specific inside host (web server) to map to the inside interface so that return traffic would go to the same firewall the traffic came in through, The reason for this configuration was because the gateway of last resort was a different firewall and not the firewall the traffic came in through.
Now to further give you some history, the gateway of last resort is an ASA running 9.1 (Now), prior to that it was a PIX with v8.0(4), traffic to the aforementioned web server came in through the gateway of last resort), which at the time was the PIX.
However, for some reason after swapping the PIX for an ASA (same rules, updated NAT rules for 9.1) access to the same web server is slow. Not sure why, but it’s the case. To alleviate the slowness we experienced, and until I can figure out why this occurs on the ASA, I placed a PIX on the network that only listens for traffic for the web server in question. On this PIX I map to the inside interface so that traffic flow works and external clients can access the web server with no issues.
So two questions, one I would like to use the configuration I have for the web server on the PIX on the ASA to see if that setup on the ASA works better, but having difficulty translating the rules to the ASA.
Second question, (Slow access with ASA to a web server, but fast with PIX to the same web server)?
P.S. Addresses in attached picture config are not real, but I know what they translate to.
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Apr 5, 2011
I would like to setup backup ISP in our ASA5510. Right now the the firewall has for default gateway following command:
"route outside 0.0.0.0 0.0.0.0 114.324.321.33 1" i am changing this to route outside 0.0.0.0 0.0.0.0 114.324.321.33 10 track 1 ...so i can setup sla monitoring. As soon as i do the above command and remove the original "route outside 0.0.0.0 0.0.0.0 114.324.321.33 1" from asa then internet connection drops. Right now asa interface Ethernet0/0 has main isp configured and configuring interface Ethernet0/3 as backup. interface Ethernet0/3 name if backup security-level 0 ip address 114.324.321.34 255.255.255.252 no shut global (backup) 1 interface.
route outside 0.0.0.0 0.0.0.0 114.324.321.33 10 track 1 ( Right now in firewall i have" route outside 0.0.0.0 0.0.0.0 114.324.321.33 1 " ) route backup 0.0.0.0 0.0.0.0 115.283.212.23 20 track 2
track 1 rtr 1 reach ability
track 2 rtr 2 reach ability
sla monitor 1type echo protocol ipIcmpEcho 114.324.321.33 interface outside sla monitor schedule 1 life forever start-time now sla monitor 2type echo protocol ip Icmp Echo 115.283.212.23 interface backup sla monitor schedule 2 life forever start-time now. Also our firewall has site to site vpn and 1 main ip configured for exchange and remote access.
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