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Questions tagged [cisco-asa]

The Cisco ASA (Adaptive Security Appliance) series of products provide Firewall and VPN functionality.

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NAT-Reflection on Cisco ASA 5508-X

We have 2 internal networks in our environment. 10.1.x as a main network (with different vlans) and 192.168.1.x/24 as WiFi for our travelling users. Both are connected to our Cisco ASA 5508-X and then ...
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Kiwi syslog server not displaying logs

I'm using kiwi syslog server, by checking the syslog.txt file I've seen an error saying (10061) the requested connection has been refused by the remote host. I have validated all the configurations ...
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Cisco ASA IPv6 single ::/64 prefix assignment

I am configuring public IPv6 (dual stack w/static IPv4 block) on an ASA 5506 ver 9.9(2)36. The ISP has assigned a single /64 prefix where 2001:2:3:4::1 (not actual IP) is their equipment and 2001:2:3:...
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Port forwarding on ASA 5510 internal - internal

I have an ASA connected to the primary network and I'd like it to do an easy port forward so that when a pc tries to telnet the ASA on port 500, for example, the ASA forward the request to a server. ...
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Cisco ASAv Ikev2 IPSec tunnel failing in phase2

We have Cisco ASAv appliance on Azure with Loadbalancer setup. while setting up IKEv2 IPSec tunnel we saw phase 1 is up and phase 2 is failing over peer ID validation, while debugging we saw that ...
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ASA5506 ASDM/https access over site-to-site VPN

I have SSH access to a Cisco ASA 5506 at a remote site, this access is via another CLI device at the remote site. We have previously used ASDM from the site so know its set up correctly. However I ...
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Please explain the ASA capture to identify re-transmissions

I have recently started troubleshooting an issue and client is suspecting re-transmissions based on the below capture, I am not sure why the data packets are repeating over and over for multiple times ...
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Can Cisco ASA PBR route to specific IP/port?

I am working on setting up PBR on our ASA-5505, and was trying to figure out if this scenario is possible. Traffic coming in via one public externa IP on port 443. ASA identify traffic via ACL and ...
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Can VLAN traffic pass through an ASA?

Let's say I had the topology L3Switch1 -> ASA -> L3Switch2 Is it possible for the ASA to pass VLAN information to L3Switch2? Example Setup
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Site-to-Site VPN from Cisco ASA 5505 to Amazon VPC

I am trying to establish a VPN connection from our on-premises rack to our Amazon VPC. The router/firewall that we have is a Cisco ASA 5505 running software version 9.1(7)23. According to Amazon's ...
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ASA allow DNS service inside to be accessed from outside

I have a shared networking environment for tenants on our building, the ASA sits between a small business internet modem and each tenant's network. Gateway Modem Cisco ASA DNS ...
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Squid proxy between two firewalls, need iptables solution

At the company I work for we need to implement what I think it's called transparent proxy. How it's now: A(lower secured area)--Cisco ASA-----Cisco ASA----B(higher secured area) What we need: A(...
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How Do I Reconfigure My Cisco ASA in order to Move it to a Colocation Facility?

My office DSL modem has a static IP address. In the ASA startup wizard, I connected to it using PPPoE. I now have it configured VPN and NAT and tested it in this environment. This weekend, I am going ...
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NIC bonding on Linux in redundant network topology

I want to implement NIC bonding on Linux server in redundant network topology as shown in the network diagram below. Network topology Both interfaces of the Linux server fa0 and fa1 would be in one ...
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2 answers
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Does factory reset for Cisco ASA 5505 keep the added licenses/features?

I bought a used Cisco ASA 5505 with existing SecurityPlus (and other) licenses already installed. A factory reset (configure factory-default) from the console will reset just the config and not ...
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ASA5506 VPN Client Blocked

I am setting a new CISCO ASA5506. I am testing a CISCO VPN Client, IPSec/UDP, and it is being blocked. I'm not even prompted for a credentials. The VPN Connection works just fine from another ...
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Getting VLAN to work between Polycom VVX phones and Cisco SG300 Switch

I followed instructions listed here --> https://community.polycom.com/t5/VoIP-SIP-Phones/FAQ-Utilizing-VLAN-s-with-Polycom-phones/td-p/38100. But came up short. So I have computers (VLAN 1) and these ...
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Is there a way to check the interface link up / down on the Cisco ASA?

Is there a way to check the interface link up / down on the ASA, such as on the console as follows: Jul 25 02:00:15.268: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/1, changed ...
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Postfix pix workaround for short mail work fine, but for long mail not worked

My postfix send email without problems. But one client domain enabled PIX workarounds. If mail message is short mail send without problems. But if mail is long - in log file I see " conversation with ...
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Cisco ASA5506: NAT issue (packet blocked even though permit rule exists)

We're having a problem with our ASA5506. The public interface "outsideSub" has internet connection via PPPoE. The ping test to a public DNS server from the outsideSub interface is successful. ...
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2 answers
657 views

Cisco ASA 5505 can't talk to anything on Site-to-Site VPN

So I have a Cisco ASA 5505 Setup with 2 Site-to-Site VPN's and a Remote Access VPN, now anything connected (Hardwired, S2S VPN or RA VPN) can all talk to each other without a problem. The problem ...
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2 answers
738 views

L2TP/IPSec: Linux can not connect to Cisco ASA (but Windows can)

Our partner provides a service that is available only through the L2TP/IPSec tunnel. We successfully connect to it from Windows, but the connection hangs dead a couple of times a week. Therefore, I ...
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Crypto Map Policy not found (but it's there.. promise!)

Sorry.. I'm new to Cisco IOS so if I need to present more info, please let me know. Using IOS 9.1(6), ASDM 7.10(1) on a Cisco 5510, connecting to an Azure VNET. (Yes, UsePolicyBasedTrafficSelectors ...
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370 views

Google Cloud VPN issue Cisco ASA Cryptomap

I am trying to set up an IPSec tunnel on a Cisco ASA. In my routes on google, I can see that only 172.0.99.0/24 and 172.0.100.0/24 should be routed through this tunnel. Google seems to be requesting ...
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Issues with Cisco IPSec VPN speed. Fast uploads, slow downloads from external to internal servers

We are using a Cisco ASA5516, configured with a IPsec (IKEv1) split tunnel VPN. When uploading files to a server behind the firewall, the transfer speeds are normal (up to 10mbps). When downloading ...
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VPN IPSEC through an internet box on one side and preserving the internet connection on the other side

I want to setup a VPN IPSec tunnel between two sites, let's say PARIS and Toulouse. The tunnel rose well and statues on VPN Gateway routers at both sides shows it's up and OK. The problem is that I ...
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WDS boot taking a long time over site-to-site VPN connection

We have three sites and a new server colocation facility that we are in the process of bringing online. We have several WDS servers at each site. We are moving servers from the smallest site to the ...
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1 answer
818 views

CISCO ASA tunnel is up but no traffic

I have reviewed the very similar questions to mine, but my scenario seems different. ASA Version 9.7(1)4 I had a VPN site-to-site ikev1 connection from a remote network in AWS to a remote network ...
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Router work as IPsec client to Cisco ASA

Is it possible to configure mikrotik as IPsec vpn client to Cisco Asa? I have ASA connected with static IP to the internet and want to connect mikrotik router behind dynamic IP internet connection to ...
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Cisco Bridge and MAC address blocking

I have two locations connected with two Cisco 861 routers. They are connected using a bridge. The subnet is the same 192.168.100.x.The routers are on E-line connection from provider. Location A is ...
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4 votes
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331 views

Monitoring for most recent version of Cisco Adaptive Security Appliance (ASA)

How does one automatically check if your Cisco ASA is running the most recent or non-vulnerable version with external monitoring? With SNMP, you can get the version number of an ASA: $ snmpget -v2c -...
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ASA Can ping between subnets, but not pass IP traffic (access rules in place, security levels ok)

I have tried getting my ASA to route traffic between subnets, i got it working for 10 minutes but after some changes (unfortunately not an ASA expert) i have broken something. One example is 192.168....
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VPN Tunnel - Crypto map policy error

Good day! GCP reports the following error: The peer gateway notifies: Proposal mismatch in CHILD SA (phase 2), Please look at peer logs. On the ASA 5505 side I'm getting: Map Policy not found for ...
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3k views

Can't ping outside IP address

Our firewall is Cisco ASA and our switch catalyst 2960. One computer keeps having the following problem : Once for a while (in one or two days), the computer can't ping outside IP address like 4.2....
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1 answer
550 views

Can I use Linux iptables to replace the functionality of a Cisco ASA/PIX?

I know iptables can route packets like a router. I've read tutorials where a Raspberry Pi can replace a home router. iptables can allow only specific ports through. However, in my enterprise ...
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Cisco AnyConnect disconnects when prompted by UAC

I have a secure network configured with Cisco AnyConnect SSL VPN and Cisco ISE for authentication. (VPN head is a Cisco ASA, AnyConnect v4.5, ISE v2.3) The client VPN works perfectly except when a ...
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7k views

Strongswan to Cisco ASA with multiple right subnet

I've got an ikev2 tunnel up, initiated on the left from an ubuntu box with strongswan going to a cisco asa. Using ASA to ASA multiple networks work but I can not get it with strongswan. #config setup ...
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885 views

FirePower Malware Notification - Track Destination

Good Morning, I received a notification from FirePower that there was a MALWARE-CNC Win.Trojan.Gh0st variant outbound connection to our exchange server. I'm guessing there was an email sent to one ...
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Recently I configured a Site-2-Site VPN Tunnel and I'm getting this errors:

Recently I configured a Site-2-Site VPN Tunnel and I'm getting this errors: 3 Feb 27 2018 09:21:57 Tunnel Manager has failed to establish an L2L SA. All configured IKE versions failed to ...
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1 vote
1 answer
2k views

Cisco ASA 5505 - Access to DMZ with one public IP

I am trying to configure my Cisco ASA 5505 firewall to allow access from the internet to DMZ web and mail server. I'm new to the Cisco world so excuse me if this is a newbie question. I know that this ...
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1 answer
613 views

Communication between ASA 5525X and a L3 switch 3750

I Have to make authorize communication between ASA 5525X and an L3 switch 3750, in the switch I've created 3 VLANs, Vlan server, Vlan Workstation, and Vlan Interconnection (Vlan number 5) the ...
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-1 votes
1 answer
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Changing existing NAT rule on Cisco ASA

This is the exact line I want to edit nat (inside,outside) source static thatplace thatplace destination static thisplace thisplace no-proxy-arp route-lookup All I want to do is enable proxy-arp. ...
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Is my VLAN configuration ideal for 2 subnets where one contains a hypervisor?

I’m not sure my VLAN is setup correctly or effectively. I’ve had my layer 3 switch for ages (Extreme Summit x450e-48p). Honestly I’ve just plugged everything into it and used it unmanaged. Before ...
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2 votes
1 answer
689 views

Why is my IOS EzVPN client not connecting to my ASA EzVPN server?

I have a Cisco 867VAE connecting as an EzVPN NEM client to an ASA 5505 server which will not connect. The server ASA has the repeated messages: 4 Nov 01 2017 23:16:45 713903 ...
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2 votes
2 answers
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How to add access list to Cisco ASA?

I have the following rules configured at my Cisco ASA firewall: access-list OUTSIDE_IN extended permit tcp any host xx.xx.xx.xx eq 3306 access-list OUTSIDE_IN extended permit tcp any host xx.xx.xx....
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Cisco ASA 5506-X - Inside to Outside Traffic

I'm unable to get traffic on one of my inside ports to route outside. I believe I have the proper NAT, route, and object configurations. The goal is to have web traffic be accessible on the inside ...
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366 views

Google Cloud Platform VPN

Is there a way to change the lifetime in seconds for Phase 1 and Phase 2 of Ipsec? I am trying to connect to a Cisco ASA 5550 at a customer site and their lifetime in seconds setting is 86,400(Phase ...
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2 votes
1 answer
507 views

Cisco ASA v.s. pfSense - How packet inspection works with VPNs

We have a small office, about 75% of our infrastructure is cloud based including a pfSense deployment we use for remote access and site to site connections which is currently public facing. We've ...
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Site to Site Ipsec VPN - Tunnel is Up but can't get to route packages from left to right

I have a working tunnel. Packages are being routed from right to left properly (Cisco side can reach my server). Here's all the info. Any help, more than welcome. Network Diagram ...
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2k views

Add AWS VPN to Cisco ASA 5515x where a VPN to another office exist

Story: I have Cisco ASA 5515x in the HQ (10.9.1.0/24) connected via site-to-site VPN to office A [10.9.2.0/24 and 10.9.3.0/24]. Challenge: I need to connect Cisco ASA 5515x to AWS VPN to reach AWS ...
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