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

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782 views

Packet loss on between firewall and uplink?

I have a moderately complex network topology between my external firewall and the internet, as shown below. Every so often - I haven't found a pattern yet - we're getting a significant degree of ...
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1answer
2k views

Cisco ASA 8.2 - 106015 (Deny) and 106100 (Permit) Logs for the Same Packet

I'm seeing traffic from numerous internal endpoints where a RST or FIN/ACK is sent by the endpoint to a host on the Internet. These connections are related with a transparent proxy that is not ...
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1answer
423 views

Cisco ASA 5505 No LAN access through VPN

I have been fighting with this ASA 5505 for a days now. I am verly new to networking and need support by the community! I have completely configured the CISCO 5505 allowing me to browse the internet ...
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1answer
78 views

Reading .pcap files by CISCO ASA5515-X

I have .pcap file that already includes thousands of packets. I want to analyze these packets via CISCO ASA5515-X to observe how much of them are possible to be an attack packet (malicious). However, ...
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1answer
191 views

AnyConnect certificate/CA pinning on Cisco ASA 5510

I would like to "pin" the certificate or at least the certificate authority for AnyConnect connections. Given the amount of SSL mitm'ing and compromised CA's, I want to ensure that only certificates ...
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0answers
123 views

Port mirroring on CISCO 2960S

I am trying to do a port mirroring of the traffic for my core switch to a port on my managed switch. The environment that i have is a stacked switch, with 1 serving as the core switch and 2 serving ...
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2answers
353 views

Why am I getting permission error from tftp server?

I'm trying to tftp an image to an ASA 5500 and I'm getting this error: TFTP failure: RX TFTP Error Packet TFTP OP Code: Error Packet Error Msg: Permission denied
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1answer
3k views

Openswan Cisco ASA 9.1 — cannot resopnd to IPsec SA request because no connection is known for

Ok, so I have a simple VPN IPSEC setup with a single Linux host that has a public IP address and a loopback interface of 172.16.255.1. On the right side I have a Cisco ASA 5505 9.1. the issue is the ...
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1answer
90 views

How to avoid hairpin VPN on cisco

I currently have a hairpin VPN setup with a Cisco ASA, but I'm not very happy as it messes up service access that are on ASA external IP address and are NAT'ed inwards :( How should I re-design the ...
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1answer
297 views

Cannot reach internal network on VPN

So i have been configuring a ASA5510 to the best of my knowledge to allow VPN access(IPSEC connection) to our internal network and its resources. There is a alot of step-by-step guides and videos ...
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1answer
192 views

Cisco ASA IPSec VPN - service discovery (e.g. shared folder browser)

We have an ASA 5505 doing IPSec VPN for remote users. Client access is working almost as expected:clients can reach hosts on the internal LAN, even using DNS, and we are tunneling all client traffic ...
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1answer
778 views

How do I configure an ASA 5505 to pull a DHCP address from a bridged DSL modem/router?

I have a remote office that I am hooking up to our corporate network and this particular site has a centurylink adsl2+ router that I need to negotiate an rfc 1483 via DHCP connection across. The dsl ...
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1answer
2k views

How should DNS be configured for remote VPN access to a Windows Domain?

Suppose you have a small windows domain configured as follows: domain name is ad.example.com (as per these guidelines) DC1 is at 10.10.10.3 DC2 is at 10.10.10.4 DC1 and DC2 are running the ...
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1answer
560 views

cisco firewall access rules for intra-subnet traffic

I have a Cisco 5505 in our office, and everything is on the 10.0.1.0 network. We have a cheap wireless router that we would like to use. The router is sitting behind the inside interface, and is ...
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2answers
198 views

Open HTTP Protocol Cisco ASA

I would like to know if it's possible to open HTTP protocol (whatever the port) for one of my subnet to the outside on Cisco ASA 5510 v9.1(4) (ASDM v7.1(5)? I guess I will have to play with service ...
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1answer
677 views

ASA stops internet when connected to VPN - firmware 9.x

I'm having issues setting up Remote access VPN on Cisco ASA (firmware 9.1) i'm able to connect via the VPN and access all internal resources but i'm not able to access internet when connected to the ...
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0answers
304 views

How to allow vpn users to access only specific servers?

Currently we have an ASA with an IP pool to allow an outside contractor to remotely connect and access our network. What we would like to do is limit what they can get to once they are connected. I ...
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1answer
352 views

Many 'Deny IPv6-ICMP reverse path check' alerts from multicast addresses on Cisco ASA

In an effort to prevent IP Source Address Spoofing (RFC 2827) I've enabled reverse path filtering (RPF) on my Cisco ASA 5505. The topology is aprox. like this. Each segment has its own IPv4 subnet ...
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1answer
2k views

Site-to-site VPN between 5505 and 5512x

I am trying to setup a site-to-site vpn IPsec tunnel between an ASA 5512x and 5505 on an isolated network. I ran through the IPsec VPN wizard on both devices and used the same configuration but they ...
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2answers
708 views

Cisco router or ASA [closed]

Can you tell me what is the difference between having both a Cisco router and ASA appliance in a network and having only the ASA? I remember that my ISP had set a router in front of our network and ...
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1answer
177 views

How many IP addresses can I expect to block on a Cisco 5500-X Series firewall?

Considering a Cisco ASA (5500-X) firewall for our internet edge in front of our web cluster. At the moment, we use a Linux box with iptables. A log analysis system detects brute-force attacks on ...
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1answer
152 views

Cisco ASA Static NAT Rule Explanation

Here is a chunk of my configuration on my ASA: name <my_external_ip> www.testwebsite.com object-group service http_https tcp port-object eq www port-object eq https access-list ...
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1answer
106 views

IIS7 using old SSL for outside clients (LAN/VPN clients okay)

I have a Windows 2008 R2 terminal server. When accessed over the web (ex. https://ts.domain.com/RDWeb) I get a message that the SSL certificate has been revoked. It appears to be issuing an old SSL ...
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0answers
134 views

ASDM - ASA Issue

This is actually a two part question, if anyone has had experience with the issue and could help me out it would be greatly appreciated. Backstory: Using GNS3 with ASA 8.4(2) and ASDM 7.1(5). I've ...
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1answer
3k views

Strongswan VPN Established but no Packets Routed

I'm setting up a VPN using strongSwan between a Linux instance on an Amazon EC2 instance and a remote network via its Cisco concentrator. I need to route packets from the Linux instance itself a ...
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1answer
6k views

Can't access ASA website to download ASDM launcher

Hoping someone can give me a pointer on here. I recently took a new position and am currently trying to learn the new system. I'm having trouble getting to ASDM and have Googled plenty to no avail. ...
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1answer
8k views

Cisco ASA 5505 - NAT or Port Forward for SIP / VoIP ver 8.4

I just had an NEC PBX installed that lets me use SIP trunks for VoIP services, My gateway is a Cisco ASA 5505 running 8.4 and I only have one public/static IP Addresses. So far, my trunks are ...
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1answer
233 views

ASA High Availability failover link configuration

According to the Cisco ASA 5500 Series Configuration Guide, Cisco's preferred method of configuring your network for ASA High Availability is as such: They have two switches on External, two ...
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35 views

Find a VPN Name on a Cisco ASA box given a remote IP address

I have a Cisco ASA box with multiple site-to-site VPNs defined. Is there a way to automate finding the VPN name based on a given remote IP address?
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3answers
2k views

VLAN over VPN (ASA 5520)? if not any other options available?

Is it possible to extend the local VLANs to a Remote site connected by IPSEC VPN using ASA 5520 / Cisco 1841 DSL router. can we have many VPN tunnels between the ASAs? (from every VLAN one vpn ...
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2answers
2k views

Cisco ASA syslog format description [closed]

Where can I find Cisco ASA syslog format description? Log example: Dec 11 08:01:24 <IP> %ASA-6-302015: Built outbound UDP connection 447235 for outside:NTP_Server_2/<port> ...
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1answer
171 views

IPsec VPN Server behind Cisco ASA (Transparent mode)

I've a Cisco ASA 5510 with transparent mode, and I'm going to setup a IPsec VPN(Openswan) in a internal linux server(with Public IP). This server has 2 NIC, 1 public IP, and 1 internal IP. I've ...
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1answer
158 views

Cisco ASA 5505: Created a faulty NAT rule. Can't reach the ASA

I was trying to create a NAT rule to reach my internal web server from inside the LAN. Something must have gone wrong. Now when i try to reach the ASA through https://192.168.1.1 the response is from ...
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2answers
681 views

Cisco ASA 5505: Reach outside DNS address from inside

We use a Cisco ASA 5505 at our company. We have a dns A record (home.company.com) pointing to the external IP. In the ASA 5505 the http-port (80) is forwarded to an inside web server. No problem ...
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2answers
2k views

IPSec tunnel on ASA keeps disconnecting

I have an ASA IPSec tunnel configured between an ASA5505 and Microsoft TMG 2010 SP2. The tunnel sometimes works for a few hours, and then disconnects, and other times it works for 5 minutes and then ...
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0answers
1k views

Cannot access L2L VPN from RA VPN connected client on Cisco ASA 5510

We have a Cisco 1921 router running IOS 15.1 at one of our branches which is connected via a L2L IPsec VPN to a ASA5510 running ASA 7.2 at our headquarters. The ASA also provides IPSec Remote Access ...
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0answers
302 views

Keepalived failover not working for Static NAT target behind Cisco ASA

I've got a Cisco ASA[0] with a pair of Linux boxes in the DMZ running Keepalived and HAproxy acting as a load-balancing failover pair for another pair of Windows servers, also in the DMZ. I'm ...
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1answer
80 views

Cisco ASA crypto keys, SSH, and VPN

I'm new to the ASA and wanted to know if regenerating crypto keys on an existing ASA with established VPN tunnels could negatively affect the tunnels. The reason for wanting to regenerate crypto keys ...
2
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1answer
357 views

Cisco ASA 5500 — List of outbound connections?

Is there a command or GUI option to get a list of outbound connections. Ideally, I'd like to know the internal IP address, the external IP address, and the remote port used. I don't need a lot of ...
2
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1answer
1k views

Dual ISP Inbound NAT — Asymmetric routing

routing question here. In a dual ISP scenario is there way to use both external IPs and nat them to a web server in a higher security level? The issue I am running into is on the return path for ...
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2answers
1k views

Cisco ASA/PIX Can't Access Internal Resources Behind NAT [duplicate]

My servers are natted 1:1 as follows, i.i.i.i maps to x.x.x.x where i is an internal IP, and x is the external IP. From an i.i.i.i machine, I cannot access x.x.x.x resources... What special ...
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1answer
552 views

Enable Cisco ASA as an SSH Tunneling

I am trying to utilize my Cisco ASA as a SSH Tunnel. I've configured this before when using a Linux server as the SSH target, however I cannot seem to get it to work with the ASA. I have configured ...
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1answer
429 views

Setup IPsec VPN using ASA5505 behind Juniper SSG5

I have been assigned to establish a Internet IPsecVPN connection between two sites using Cisco ASA5505 A site currently has following setup.(Same setup is expected in another site) Internet----->ADSL ...
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188 views

Cisco ASA: backup ISP connected to ASA for ASA access alone

What I'd like to do: Connect an interface to a separate ISP and let home user's VPN into the LAN via that interface, while normal web browsing traffic goes out the outside IF. My initial ...
2
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1answer
151 views

Is this a common/bug on this PPPoE setting for Cisco ASA 5505?

We have to change the way the firewall setup due to we've changed the internet provider. The way we setup we have ADSL modem and we have to do a full bridge mode and the firewall configuration has to ...
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1answer
41 views

Seeing odd (to me) packets in a network capture

This morning I connected a system to our switch connected to our ISP handoff in order to do some wiresharking. I had yet to set up any port mirrors, and confirmed that there were none in place. ...
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238 views

Cisco ASA, Windows Server 08, PPTP/GRE issues

I am at the end of my rope on this one. I am trying to simply forward pptp/gre through a Cisco ASA to my Windows server. Here is what I have done: Access Rules: OUTSIDE ...
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1answer
103 views

ASA 5505 - Outside IPs required for VPN Tunnel?

I've set up a Site-Site VPN and it seems the config is fine as the other site can establish the tunnel fine. The problem I have is that my side never tries to bring the tunnel up. Ping/telnet ...
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1answer
840 views

Cisco ASA 5510 SNMP config-change

I´m trying to set snmp trap when cisco asa 5510 is changed. I´m using this line: snmp-server host DMZ ZZ.YY.XX.5 community * snmp-server enable traps entity config-change fru-insert fru-remove But ...
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1answer
383 views

Cisco ASA 5510 : VPN split tunnel Strange behaviour

I work with a Cisco ASA 5510. I have enabled remote VPN connection with radius Authentication to two different internals networks: 10.1.0.0/16 10.10.0.0/16 from mobile VPN pool 192.168.111.0/24. ...