Hi Everyone,We have an FTP server that sits in our DMZ. This Server has a DMZ interface and an external interface. When trying to access the server from the internet on its external address i am getting alot of Duplicate SYN attacks. They seem to ...
Network Security
Engage with peers and experts on network security topics such as Secure Firewall Threat Defense, Adaptive Security Appliance, Secure Firewall Management Center, and Security Cloud Control.
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for
- Cisco Community
- Technology and Support
- Security
- Network Security
Options
- Mark all as New
- Mark all as Read
- Float this item to the top
- Subscribe
- Bookmark
- Subscribe to RSS Feed
- Threaded format
- Linear Format
- Sort by Topic Start Date
Labels
-
AAA
(8) -
Access Control Server (ACS)
(6) -
Access List
(4) -
ACI
(10) -
Advanced Threats
(1) -
AMP for Endpoints
(1) -
AnyConnect
(3) -
APIs
(1) -
Appliances
(18) -
ASA
(1) -
ASR 1000 Series
(1) -
Branch Router
(2) -
Buying Recommendation
(85) -
Catalyst 2000
(1) -
Catalyst 3000
(2) -
Catalyst 4000
(1) -
Catalyst 6000
(1) -
Catalyst 8000
(1) -
Catalyst 9000
(2) -
Catalyst Switch
(2) -
Catalyst Wireless Controllers
(1) -
Cisco
(1) -
Cisco Adaptive Security Appliance (ASA)
(9,546) -
Cisco Bugs
(34) -
Cisco Cafe
(25) -
Cisco CLI Analyzer
(1) -
Cisco Cloud Services Router
(1) -
Cisco Defense Orchestrator (CDO)
(140) -
Cisco Firepower Device Manager (FDM)
(812) -
Cisco Firepower Management Center (FMC)
(2,909) -
Cisco Firepower Threat Defense (FTD)
(3,164) -
Cisco Press Cafe
(1) -
Cisco Secure Firewall Device Management (FDM)
(11) -
Cisco Secure Firewall Management Center (FMC)
(63) -
Cisco Secure Firewall Threat Defense (FTD)
(86) -
Cisco Security Cloud Control
(2) -
Cisco Security Manager (CSM)
(3) -
Cisco Software
(17) -
CISCO START ANZ
(1) -
Cisco Threat Response
(1) -
Cisco Vulnerability Management
(44) -
Cloud
(1) -
Cloud Security
(3) -
Community Bug or Issue
(1) -
Community Feedback Forum
(31) -
Community Ideas
(18) -
Compliance and Posture
(1) -
Crypto
(1) -
CSC Content with No Valid Community to Post
(1) -
CUBE
(1) -
CUCM
(1) -
Data Center Networking
(1) -
Device Admin
(13) -
EEM Scripting
(1) -
Emergency Responder
(1) -
Endpoint Security
(6) -
Enterprise Agreement
(1) -
Event Analysis
(259) -
FirePOWER
(1) -
Firepower Chassis Manager (FCM)
(2) -
Firepower Device Manager (FDM)
(16) -
Firepower Management Center (FMC)
(408) -
Firepower Threat Defense (FTD)
(221) -
Firewall Migration Tool (FMT)
(27) -
Firewalls
(1,171) -
FMC
(1) -
General
(2) -
Guest
(1) -
Identity Services Engine (ISE)
(9) -
IE3300
(1) -
Integrated Security
(8) -
Integrated Security Architecture
(1) -
Integrations
(3) -
Investigation
(2) -
iOS
(1) -
IPS and IDS
(6,574) -
IPS and IDS1
(1) -
IPS-IDS
(1) -
IPSEC
(1) -
ISE
(1) -
LAN Switching
(7) -
License
(321) -
MPLS
(1) -
Multicloud Defense
(3) -
Network Management
(91) -
Network Security
(2) -
Networking
(1) -
NFVIS
(1) -
NGFW Firewalls
(37,565) -
NGIPS
(1,873) -
Online Tools and Resources
(1) -
Optical Networking
(3) -
Optics
(1) -
Other Collaboration Topics
(1) -
Other Community Feedback
(4) -
Other Firewalls
(1) -
Other NAC
(18) -
Other Network
(1) -
Other Network Security Topics
(10,774) -
Other Networking
(9) -
Other Routers
(9) -
Other Routing
(24) -
Other Routing and Switching topics
(2) -
Other Security
(1) -
Other Security Topics
(18) -
Other Switches
(11) -
Other Switching
(4) -
Other VPN Topics
(1) -
Passive Identity
(1) -
Physical Security
(20) -
Policy and Access
(2) -
Prioritization
(2) -
Remote Access
(2) -
Room Endpoints
(1) -
Routing Protocols
(7) -
SD-WAN Security
(1) -
Secure Network Analytics
(1) -
Security
(3) -
Security Management
(631) -
Segmentation
(3) -
Service Providers
(1) -
Small Business Routers
(4) -
Small Business Security
(2) -
Sourcefire
(2) -
Support
(2) -
Threat Containment
(6) -
Threat Defense
(1) -
Threat Grid
(1) -
Unified Computing System (UCS)
(1) -
Voice Gateways
(1) -
VPN
(24) -
VPN and AnyConnect
(1) -
Vulnerability Management
(43) -
WAN
(7) -
Web Security
(5) -
Webex Teams
(1) -
Wired
(3) -
Wireless Security
(1)
- « Previous
- Next »
Forum Posts
So here is my situation, let's start with the networkI'm working on a cisco ASA 5510, not sure of the OS, but its the pre-8.3 NAT10.0.100.0/24 -> inside network (inside VLAN)192.168.100.0/24 -> What i need to NAT to (several ranges via another device...
Hi,I have ASA 5520 firewall with web filtering. I have lots of sites been blocked for security reason, like facebook, prone sites and so on... After blocking those sites i have found out that users being using proxy software i.e. ultrasurf and seen t...
HiDoes any one advise the current ASA 5510 is going to EOS ?Tks
Hello,I have two Internet connections which are connected to two ISR 2951s. Also I have two ASAs 5545-Xs, which I want to use in Active/Active failover mode with multicontext. The question is: how can I configure ASAs to perform ISP load-balancing as...
Hello Everyone,I am working in one of the financial institute and we in process of implementing our bank ATM. Our ATM Switch is located at Nepal. Now to make our ATM functional, i was instructed to create a VPN tunnel where our bank ATM machine can t...
I am novice to the FWSM teachnology.We have FWSM which has the multiple context configured for the different business at one site.On ther site we have FWSM which is configured with multiple SVIs for the different business.What is the difference betwe...
Hi everyone,I have a cisco asa 5510 version 8.3. My company has a internet policy company like that;client use range IP 192.168.100.0/24My boss wants to block a range IP from 192.168.100.20 to 192.168.100.200, but they can access skype, email and com...
Resolved! Adding public IPs
we have a /24 range of public IP addresses assigned to us by our ISP, what would be the process of assigning multiple public addresses on the outside interface on cisco asa running os version is 9.1 ? we have an outside, inside, and dmz interface. wh...
After successfully installing CSM 3.2.2 I was able to log in to the Manager and Client. Now when I try to log in to the Manager I get Forbidden - You don't have permission to access /cwhp/LiaisonServlet on this server. Additionally, a 403 error was e...
Resolved! Debugging ASA DNS inspection
How can I debug ASA (9.1(1)) DNS inspection? Specifically, the ASA is blocking the queries associated with dig requests like the following from ever reaching "the.name.server": dig @the.name.server -t ptr 1.2.3.4.reverse.somedomain.com.And I'd lik...
ASA 5505 Version 8.2 or oldernat (inside) 1 10.0.0.0 255.255.255.0nat (INTF4) 1 10.0.4.0 255.255.255.0nat (INTF5) 1 10.0.5.0 255.255.255.0nat (INTF6) 1 10.0.6.0 255.255.255.0nat (INTF7) 1 10.0.7.0 255.255.255.0global (outside) 1 209.165.200.235-209.1...
Hi,I am working on ASA and TMG proxy server design and need your expert advice. The setup is <TMG> ||<Internet><ASA><CORE SW><LAN/WLAN> | <DMZ>I am placi...
Resolved! Upgrade ASA 5505 v7.2.4 ASDM v5.2.4
I have been browsing the forum and the support notes for a couple of hours and haven't found a definitive answer to my question. Our ASA is on the subject versions. I watched a video on YouTube stating that upgrading the ASA is easiest if you upgrade...
Hi Everyone,I have my webserver (30.30.30.50) located at DMZ zone. The public IP of my webserver is (119.2.116.191). From outside i can ping my webserver using public IP thats fine.The issue out here is, if i want to ping my webserver using public IP...
Learn, share, save
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide
Unanswered Topics
| Subject | Author | Posted |
|---|---|---|
| 10-08-2025 02:11 AM | ||
| 09-30-2025 03:35 AM | ||
| 09-26-2025 12:33 AM | ||
| 09-24-2025 06:11 PM | ||
| 09-23-2025 04:54 AM |
New solutions
Top Solution Authors
| User | Count |
|---|---|
| 16 | |
| 5 | |
| 2 | |
| 1 | |
| 1 |
