Cisco Firewall :: ASA 5520 - Connection To Multiple Switch Stacks
Nov 11, 2012
Currently in our environment we have have two buildings with an ASA 5520 in each and a core stack of 3750's in each building. I am currently working on a network segmentation project and am thinking of adding another stack of 3750's in each building to add more redundancy to our network. This will allow our access layer switches to have a trunk to each stack and prevent an outage if one of the links or stacks were to go down.
My question is how I would set this up on the ASA end of things while using a common subnet and HSRP on the 3750's. I understand how to use HSRP and STP on the switches to achieve this on the 3750 end of things. I saw you can do etherchannel on the ASA with 8.4 but how does that work in a failover situation?
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Apr 9, 2012
I have a customer that would like a 40Gb port-channel between two 3750-x switch stacks. When I try to activate four 10Gb ports in the channel, they go into error-disable. However, I am able to create a 20Gb port-channel without issue. I have had my configurations verified to Cisco best practice.
Is there a limitation on the amount of throughput that the 3750-x can handle? According to the data sheet the 3750X-48T can handle 101.2mpps, based on two 10Gb uplinks so if my math is correct then a stack of two 3750X-48T should be able to handle 202.4mpps.
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Aug 15, 2011
My basic question is, does Cisco VPN Client allow two simultaneous VPN connections at once?I want to set up the following:User Client (Remote Access VPN via Internet)--> Head Office ASA 5520 A/S Pair --> (Remote Acces VPN via Internet) --> Branch Office ASA 5510S+ A/S Pair,So, in order to access the branch office system, the user must:Connect to Head Office ASA peer via Cisco VPN Client (user/password authentication),Head Office ASA peer gives a private 172.16.1.x IP, and is configured to route all requests to Branch Office's public ASA IP via it's own public IP address. Once Head Office VPN established, user establishes a SECOND VPN tunnel from Cisco VPN client (user/password and cert-based auth).
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Apr 28, 2013
I have ASA 5520 with Ver 8.2.Outside interface is directly connected to ISP's router(TelePacific) and is assigned one of public IP:198.24.210.226.There are two servers inside the network with the private IP's:192.168.1.20 for DB Server, and 192.168.1.91 for Web Server.I did Static NAT 198.24.210.226 to 192.168.1.20 and 198.24.210.227 to 192.168.1.91.When I access DB Server(198.24.210.226) it's working OK but when I access Web Server(198.24.210.227) there is no response at all.I checked the inside traffic, it even did not get into the firewall.Is this the problem with ISP's router? How can we route all of our public IP's to the outside interface(198.24.210.226)?
interface GigabitEthernet0/1nameif insideip address 192.168.1.1 255.255.255.0security-level 100no shutdown
interface GigabitEthernet0/0nameif outsideip address 198.24.210.226
[Code].....
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Oct 16, 2012
I have ASA 5520 with Version 8.2(5), the ISP give me a block of IP pubic (201.148.156.193/28), one IP valid (201.148.156.194) have the Global NAT (all users LAN) and server FTP, but i need that IP 201.148.156.195 is used for VCSe, and the IP 201.148.156.196 is used for other server FTP.
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Apr 4, 2011
I've got a cisco asa 5520 and setting up the NAT for multiple DMZs on it.
I want to use PAT on the outside interface.
internally ive created subinterfaces for the VLANs and connected to a trunk port on a switch.
configure NAT for this scenario. I've got only 1 external public IP address.
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Mar 17, 2011
Got an ASA5520 running V8.2(3) and we want to upgrade our internet bandwidth. Our ISP says OK but we need to install different physical circuit, upgrade CPE router, etc.
Then they say, btw your globally allocated IPs will change - this is a problem as we have Site-to-Site VPN Tunnels, IPSEC RA, etc.
ISP are proposing to give us a 3 month period whereby old & new IP blocks will be routed to our ASA (by means of secondary IP address on their Cisco CPE).
Multiple IPs on the same physical i/f on the ASA require sub-interfaces/IP Addresses/VLAN ids on my "outside" i/f.
Is this going to horiibly break Site-to-Site VPN Tunnesl, IPSEC remote access ?
Will VLANs work at all with IPSEC on the "oustide" i/f at all ?
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Mar 8, 2013
I need to configure multiple context mode with active/standby failover solution.
Even after reading some Cisco documents I still can't understand if active/standby failover configuration has to be done within the admin context only or also within every single context (context-1, context-2 for example). In this case I have to allocate as failover interface a subinterface for each context (admin, context-1, context-2), right ?
Therefore a I have an other question: within the admin context, in a failover solution, do I have to allocate all interfaces I want to be moniotred, even though some will be used by context-1 only context and some others will be used by context-2 only context ?
An other question is: if active/standby failover configuration has to be done within each context, can I set regular failover within context-1 while stateful failover within context-2 ?
The last question is: can I use management interface within all 3 contexts ?
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Mar 23, 2011
where all the rooms have a single internet connection. Apparently, we aren't allowed to connect more than one network device at a time and the MAC address of the device is registered. I know that setting up a router won't probably work, but what if I use a hub or switch? According to my limited knowledge, these are a little less intelligent devices that could make this doable, but how?...Or could I maybe connect to internet through the main PC?? I really want to connect another laptop in my room..
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Feb 9, 2013
We have a HP Procurve 5412zl switch as our default gateway for all our VLANs from there the traffic will be going to a Cisco ASA 5515 and then to a Cisco 3800 Router then to our ISP.
We have yet to purchase the ASA but my question is about my future configuration. I will have the router of last resort on the 5412zl setup to point to the ASA inside interface, how does that work with multiple VLANs? For instance the ASA inside interface would be 10.0.0.1 but traffic could come from another VLAN via the switch with a 192.168.1.x address. Would the ASA just pass it on to the router? Or would it conside this spoofing and drop the packet?
Lastely, if we have WCCP set for the ASA's inside interface, how would it handle the redirect for multiple VLANs ip addresses? Would I use GRE for the redirect to my web filter?
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Feb 7, 2013
i've two cisco asa5510 with 4 FastEthernet interfaces each.They are connected as below:
[code]...
to three different ISP each of them! The 4rth interface of each of them, is connected to internal LAN network. Both Firewalls, offers VPN Services to ISP connections on Fa0/0
How can i achieve high availability for this scneario?is this possible to implement some HighAvailability and to offer the actual services to each of them, in case that the other firewall fail?What about using subintefaces? can i connect bothe ISP and Customers links on one or each of them, in case that firewall01 fails, all the services to be online on firewall02?
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Mar 9, 2010
Is it possible to have multiple dhcp pools for multiple VLANs? The switch is a 6509 and/or 4506 catalyst. I don't want to use server-based products.
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Dec 12, 2012
I have a problem with the connections to the remote webservice passing through ASA 5520 firewall. Connections are usually interrupted in perod of half an hour in every few days.
This ASA 5520 firewall is only one firewall in a path to the remote webservice.
During the interruption I find the logs:
UTC: %ASA--4-419002: Duplicate TCP SYN from dmz1:x.x.x.x/.... to outside:y.y.y.y/p with different initial sequence number
Teardown TCP connection 28309406 for outside:y.y.y.y/p to dmz1:x.x.x.x/.... duration 0:00:30 bytes 0 SYN Timeout
How I could find root cause? Could it be solution implemetation of TCP State Bypass?
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Oct 7, 2012
We recently replaced our Cisco 5510 with a 5520. I had the SSL Client VPN working on the 5510, I cannot get it working on the 5520. The IOS version is 8.2(5) and the ASDM version is 6.4.I run through the SSL Client wizard and get everything set up. When I try to get to my outside interface Internet Explorer just comes up with an error. When I try to connect through the Cisco AnyConnect client on my Android it used to come up with a "No address available for SVC connection". After deleting an address pool not even related to my SSL VPN profile I cannot get that far. I just get a "login failed". Even after I create a user with level 15 privilege and assign to my vpn group policy.I still get the "No address available for SVC connection" when I try to connect to the default profile, which doesn't really go anywhere.
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Apr 9, 2013
Device Cisco ASA
Model:5520
OS 8.4(2)
I am not able to access the device via SSH .After connecting to teh console I have found that allowed SSh session are fully utilized with show resource usage command and the output is [code]
So I used show ssh session command to see who is using the sessions but in the output it has showed only one session and the output was [code]
I was wondering why it shows only one session above instead of showing all the 5 sessions which are utilized as confirmed by show resource usge command.We are usning some internal tool for ssh monitoring on device which is poling the device after a fixed interval for port 22 reachabilty .I dont think these tools are making any issue as this is secondary firewall and we are not facing any reachabilty issue for primary firewall.also we are using 10 min for idle ssh timeout.
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Oct 25, 2011
I configured multiple vlan on my Cisco ASA5520. Everything work perfectly except RDP (3389) connections. The connections are established but but after a period of inactivity, the user is disconnected from server (black screen). The same problem happens with other type of connections (client/server), exemple : Oracle, file sharing. Before installing the ASA, computers and servers were in the same vlan and it worked well.
There's a notion of inter vlan timeout connection ?
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Jun 24, 2012
I have a Cisco ASA 5520 that I'd like to be able to connect directly to our gigabit fiber connection (we're currently connected through a media converter that's causing problems). I've found the following:Cisco ASA 5500 Series 4 Port Gigabit Ethernet Security Services Module [URL]. I only need a single fiber connection, as opposed to the 4 copper + 4 fiber.
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May 30, 2013
We are working with an ASA 5520 and it seems there is an issue with some email messages sent throught it. When there are many recipients in the emails the email messages are not sent, and I have revised the server an the only thing I see is connecting dropped. When I went to see ASA log and see this log report: ESMTP Classification: Dropped connection for ESMTP Request from 'interface': servername/portnumber to outside: IP address/25; matched Class 2: cmd RCPT count gt 100 tcp flow from interface:servername/portnumber to outside: IP address/25 terminated by inspection engine, reason - inspector disconnected, dropped packet. So I think there should be an inspection of ESMTP packets and if they detect an email message sent to over 100 addresses, then the packet is dropped, am I right? if so, what should I do to let those email messages be sent?
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Nov 28, 2012
I have a Cisco ASA 5520 that we was working properly. I tried to create a VPN IPSEC to test but when I finished the wizard I lost the conection between the inside interface and outside. I use other interface for DMZ and other for printers network but this adapters are working properly. I have reviewed the NAT's and the ACL's but I don't see the problem?
I have delete the VPN IPSEC but it's still not working and I have the network down
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Oct 19, 2011
I have a server in a DMZ behind the ASA, connections to this server work sometimes and then fail others, so I dont think i'm looking at an ACL or NAT problem here.The syslogs report a SYN Timeout,I have taken a trace on the ASA, it seems that a SYN-ACK does come from the destination server within the 30sec timeout, but its not passed through the ASA back to the source ? there is one odd thing, what seems to be an out of sequence ACK from the destination which arrives before the SYN-ACK at the ASA, i'm wondering if this might be the problem ? This only occurs on the connections which fail, the connections that work, the destination responds quickly to the initial SYN, and the 3way handshake completes.
Syslogs :
Oct 18 19:17:32 nzlsudfedsi001-pri Oct 18 2011 19:17:32 NZLSUDFEDSI001 : %ASA-6-302013: Built outbound TCP connection 42327212 for IIP-ARCHIVE-PROD:172.24.32.31/21 (172.24.32.31/21) to BPO-TRANSIT:x.x.x.x/59392 (x.x.x.x/59392)
Oct 18 19:18:02 nzlsudfedsi001-pri Oct 18 2011 19:18:02 NZLSUDFEDSI001 : %ASA-6-302014: Teardown TCP connection 42327212 for IIP-ARCHIVE-PROD:172.24.32.31/21 to BPO-TRANSIT:x.x.x.x/59392 duration 0:00:30 bytes 0 SYN Timeout
[code].....
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Mar 27, 2011
Ive got a virtualised firewall running 3 security contexts in routed mode. What am experiencing is that i cannot connect to an OUTSIDE host through the security contexts. From the firewall itself i cannot ping the directly attached host on the OUTSIDE interface but i can ping the directly attached host on the INSIDE interface. When i reload the firewall box, the first ping to the OUTSIDE host would be successful but subsequent pings fail and thus total connectivity is lost.
I even tried upgrading to ASA version 8.4(1) but still the same.
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May 1, 2013
We have ASA 5520 firewall.For broadband Internet access, we have T1 Router(edge router provided by ISP) which provides public IP's 198.24.210.224 / 29. We have usable public IP's 198.24.210.226 - 198.24.210.230 with default gateway 198.24.210.225. We assigned 198.24.210.230 255.255.255.0 to the outside interface.
If we connect the ASA 5520 outside interface directly to T1 router, can all packets with destination addresses 198.24.210.224/29 reach the outside interface without using other device like another router or switches?I just assume that only packets with destination address 198.24.210.230(outside interface ip) can reach the outside interface from the edge router.Is it wrong assumption? If it is correct, then is there any way to route all packets with destination address 198.24.210.224/29 to the outside interface?
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Jun 27, 2012
I am using a pptp server running on windows 2008 server and I have configured my ASA 5520 to let the PPTP traffic to pass throught.
The solution works quite well but exactly every 120 minutes the connection drops and people have to reconnect. Is there any setting to change? In the PPTP server I haven't found any setting to change.
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Nov 3, 2011
I have a client that has an ASA 5520 that has two internet connections, FIOS and Comcast. The ASA is configured to failover from the FIOS to the Comcast if the FIOS fails. This works perfectly fine. However, I was wondering if VPN and other inbound traffic will come into the secondary connection when it is active. I think VPN will work inbound when the FIOS connection fails, but I am not sure about the other inbound connections.
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Oct 2, 2012
I am trying to stack the following -
3750G 12S - 12.2.53(SE2 IP Services) Running EIGRP & OSPF
with
3x 3750X 48P-S - 12.2.53(SE2 IP Base License)
Doing some research, the IP Base does EIGRP on the 3750X, does it do OSPF?
If not I will have to get licence for the 3750X?
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Jan 30, 2013
I have 2 3750 switch stacks which I would like to have redundant trunks between them. This will provide two physical connections traveling through different geographical locations for redundancy in the event that a cable is severed. I couldn't find anything in regards to setup/config. Does it matter if I go stack1/switch1 to stack2/switch1 and stack1/switch2 to stack2/switch2 or should they cross to opposite switches like a stack cable? I don't think that should be necessary, but couldn't find any documentation. Should there be an issue with loops?
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Mar 7, 2013
On first floor, I have two stack switches and each stack has got 4 switches. they all are working fine.Now the client would like to add one more stack on the 2nd floor. But the second floor switches are different when compared to the 1st floor switches.
can you have differnt IOS among different stacks. I knew in a stack we need all the switches should have same IOS version. But in between two stacks to communicate do we need same IOS or they can be on differnet IOS?
1st floor switches have 15.0 version and 2nd floor new switches has 12.2.58. Is this ok ?
1st floor switches are 3500 series ( Note: only one one Vlan 20 we are using on the both stack switches and we would like add same Vlan 20 on to the new stack)
2nd floor switches aew 2 catalyst 2960 switches.
Note: on the second floor switches one is 24 port switch and the other one is 48 port switch. so can i make them as a stack?
We have already done cabling from 1st floor to second floor. So no problem with that at all.
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Sep 27, 2011
We have 2 Cisco ASA 5520 configured as Active/Standby with public IPs 68.171.xxx.xx6 and 68.171.xxx.xx7 respectively.We have 3 different vendors who are trying to access our Data Center. Do I have to have 3 different public IPs for these 3 different vendors? Or, just share the public IPs assigned to our 'Outside' interface?
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Jan 27, 2012
I have a 3750 as core switch, adding 2 stacks of 2960S to connect. I want to establish etherchannel between the 3750 and each additonal 2960S stack, do the channel group numbers between the 3750 and the new 2960s have to match? 3750 has two channel-groups(1 and 2) already configured. Need to know, I would create 2 additional channel groups (number 3,4) for each of the etherchannels between the 3 2960S Stacks and 3750? OR channel-group # is local to the device.
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Mar 10, 2011
Our ASA 5510 is running 8.0(5). We recently upgraded the license from base to security plus. By doing so the capacity of the the external port Ethernet0/0 and Ethernet0/1 should increase from the original FE to GE. But, we were still seeing 100 Mbps on our Ethernet0/0 interface. We figured that out that the provider switch is only supporting 100 Mbps which is a bottleneck for us.The provider will be upgrading there switches to 1 Gb switch.
We will have to swap the switch connections now from 100 Mbps to 1 Gb switch.What commands should we be familar ourself with?Though this will be doine in our maintenace window.All the transaltions/connections will be dropped in our production environment so we are kind of scared.
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Jan 11, 2012
I'm running a IPSec VPN between a 5520 ASA and a 2811 router. The ASA has a static IP and the router has a DHCP interface.The VPN seems to work fine once I get done clearing old SAs, but each new IPSEC SA creates a new ISAKMP SA on the router? There are multiple subnets that need to create multiple IPSEC SAs. Eventually I can clear the older ISAKMP SAs and get all the traffic on one ISAKMP SA, but until I clear older SAs, new associations won't form. Why the router (initiator) would keep creating new ISAKMP SAs and not use an established one? Using PSK, aggressive mode and no PFS. ASA has another dynamic crypto map with lower priority than this one. Using FQDN for identity on the router. ASA version 8.2(5) and IOS is 12.4(20)T1.
Must be something I'm not understanding. The ASA says no established SA and drops the new SA attempt until I clear older ISAKMP SAs out of the router. Interesting, the first few IPSec SAs form when the tunnel initially comes up. I assume the initial requests are getting cached and work immediately after the first ISAKMP SA forms, but subsequent IPSec SA attempts will fail. Once all subnets are talking with 1 ISAKMP SA, rekeys don't cause any problems. Since the router subnets have to instantiate the new IPSec SAs, this is a real pain to go through anytime the WAN/VPN fails.
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Apr 1, 2013
I have a home office with multiple VLANS/subnets I have many VPNs that connect only a specific subnet to a specific remote offfice. On a 5520, can I create a S2S VPN to different remote offices that have the same IP scheme, but from different home office subnets? For example at my home office let's say I have two independant, distinct VLAN/subnets: 192.168.140.0/24 and 192.168.150.0/24. Can I create an S2S from the 140 subnet to a remote office with a 10.10.10.0 addressing scheme and another S2S from the 150 subnet to a totally different office also with a 10.10.10.0 scheme?
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Nov 2, 2012
We were using ASA-5520-K9 with ASA-SSM-AIP-20-K9 but recently found some hardware problem in our running ASA. Now cisco want to replace with ASA-5520-K8.
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