Cisco Firewall :: ASA5510 Or 5520 Can Protect DDos Attack And Sync Flood

Sep 3, 2010

Does Cisco ASA5510 or 5520 can protect DDos attack and sync flood ?I have problem on this, so how can i protect on this, some time i saw on my log like this"sync flood " or "ddos to xxx.xxx.xxx.xxx" the ip address random .

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DDOS Attack - How To Change IP Address

Jun 29, 2012

I am wondering how to change my internet IP address as someone is DDOS attacking me on a daily basis. I have tried all the ipconfig stuff, and unplugged my modem for an hour. Not sure what to do at this point. Plugging my PC directly to the modem changes my IP, but then when I plug my PC back into my router, it changes back.

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Home Network :: How To Block A DDOS Attack

Feb 2, 2012

Is there anyway to block a DDOS attack? I dont know to much about DDOS attacks and how they work, but i think i understand a little bit of it. Is there no way to configure a firewall to detect rapid, spontaneous,continuous amounts of fragmented, random data coming from an IP address? Wouldn't the data coming in from a DDOS server be somewhat distinct from data that flows normally

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Cisco Firewall :: Getting DoS / DDoS On ASA 5520

May 3, 2012

I am currently getting DoS/DDoS on my asa 5520 , the attacker is hitting IP's that are not even open on any port. The attack is filling up the queues on the firewall which is at 99% CPU during the attack. here's the NetFlow info that I was able to get from my ISP ( since I dont have a Router to do that ). [code]

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Cisco Firewall :: Launch LAND Attack Against Firewall ASA 5520

Apr 15, 2013

I try to launch a LAND Attack against my firewall ASA 5520. Everything will work fine. But why, I think it should not work. I use a little tool where I can user a spoofed address, with a cluster shell and attack the firewall interface with the source of 127.0.0.1 ore the ip address of the interface as the source and destination. Then I get a cpu load of 89% with only two host. With IP tables I can use kernel processes to prevent this. But I don´t find anything for ASA.

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Cisco Firewall :: Failover License Sync Between Two ASA 5520?

Jun 3, 2013

According to the link here:[URL]Starting with Version 8.3(1), it no longer needs to install identical licenses. Typically, we only buy a license only for the primary unit; for Active/Standby failover, the secondary unit inherits the primary license when it becomes active.So I wanna know if there's some additional configuration to synchronize the licenses such as SSL VPN or Context between the primary one and the second one? Or they can just synchronize by default as soon as I finish the failover configuration and when the primary one gets down, the second one will take over the role including licenses automatically?

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Cisco Firewall :: ASA5510-MEM-1GB With 5520 Usage

Mar 10, 2013

Can I use this memory in my 5520 firewall? ASA5510-MEM-1GB=.

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Cisco Firewall :: 5510 - Deny IP Due To Land Attack

Mar 27, 2011

We are getting continuously log created as below in ASA 5510. I suspect something is going wrong (like system is getting compromised ? )
 
Note: I have changed the actually public IP to 1.1.1.1 for some security cause.
 
Log..
 
Mar 18 21:46:19 124.153.100.44 Mar 18 2011 21:46:22: %ASA-2-106017: Deny IP due to Land Attack from 1.1.1.1 to 1.1.1.1Mar 18 21:46:19 124.153.100.44 Mar 18 2011 21:46:23: %ASA-2-106017: Deny IP due to Land Attack from 1.1.1.1 to 1.1.1.1Mar 18 21:46:20 124.153.100.44 Mar 18 2011 21:46:23: %ASA-2-106017: Deny IP due to Land Attack from 1.1.1.1 to 1.1.1.1Mar 18 21:46:21 124.153.100.44 Mar 18 2011 21:46:24: %ASA-2-106017: Deny IP due to Land Attack from 1.1.1.1 to 1.1.1.1(code)

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Cisco Firewall :: PIX 525 Anti-Spoofing Attack Protection

Mar 19, 2011

I have multiple questions about the PIX 525 software version 8.0(2) ASDM 6.0 (2)I am a windows network admin that is new to Cisco and routing in general. I have read through the forums and the Cisco documentation, but have not been able to fully understand the topics discussed within.

1. Anti-Spoofing Attack Protection
2. Scanning Threat Detection - Auto Shun
3. NTP Sync Verification
4. QoS implementation5. IOS and ASDM Backup
 
This option is currently DISSABLED for all interfaces.I know what ip address spoofing is, but what is the functionality of these options specifically? How does it work and should I enable it and for which interfaces? Second Question: Scanning Threat Detection - Auto Shun
 
I found this option in ASDM under: Configuration --> Firewall --> Threat Detection.Enable Basic Threat Detection and Enable Scanning Threat Detection are both currently ENABLED, but Shun Hosts detected by scanning threat is currently DISABLED. Also, the Networks Excluded from Shun field is empty. I know what the shun command does. I have used it many times when I have been fortunate enough to catch some piece of **** trying to spam my mail server or gain access to it.
 
What I am asking specifically is how does the Auto Shun work? Should I enable it and what are the potential consequences? Also, what exactly is a scanning attack?
 
I am not familiar enough with the PIX and with the topics discussed in the document to successfully apply the info within. Plus, I'm not sure it covers the kind of basic, all-inclusive bandwith cap I would like to put in place.
 
The goal is to cap the maximum internet (outside) bandwidth that inside5 can use to a reasonable percentage while allowing the other interfaces to have the remainder.

How would I go about this implementation? 2. Is there a way to allow inside1 - inside4 to use max bandwidth when there is no traffic on inside5?
 
I am probably, at least, the third owner of this device and I do not have an account with Cisco nor can my tiny (perhaps non-exsistant given the current economic state) IT budget afford any form of support or software licensing with them.My goal is to backup the IOS and ASDM data in the event that I have to replace the device due to a hardware failure.
 
I found a file transfer function within ASDM which allowed my to copy the files pix802.bin, asdm-602.bin and tfp from flash to my desktop computer. I also have a copy of the activation key info and my current configuration.
 
1. Have I backed up all the data/info I would need to restore this software and ASDM to another unit.
2. The activation key screen also has a serial number field. Is this the hardware serial number or is it for the software? and is it tied to this device specifically or can I use it to restore another unit if necessary?
3. Is there anything else I should do or be aware of regarding backup and restore for the PIX?
4. What is the tfp file?

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Cisco Firewall :: Land Attack Alerts ASA 5510

Mar 21, 2013

We are getting below logs in our Syslog, how could i stop this."%ASA-2-106017: Deny IP due to Land Attack from 161.233.167.65 to 161.233.167.65 "

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Cisco Firewall :: ASA 5510 - Send Only Alarm Of Attack By Email

Apr 12, 2011

I have a Cisco asa 5510. I am doing attack a my firewall, using n map. I am seeing in the log the attack but i like that firewall send only alarm of attack by email . I have active email with warning and i received very much email.
 
I observed that graph show attack, but not ip of attacker, is possible that Cisco asa show the ip too ? The log show scanning with n map but not shunning IP and not send alarm. How i can send alarm ? The graph no show ip, it's possible show it.

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Cisco Firewall :: Keep ASA5520 Firewall In Sync

Aug 22, 2011

I have two asa 5520 firewalls. one at my primary data center connected to our production Internet feed, and one at my fail over data center connected to a backup internet feed. I was wondering if there was an easy way to keep the firewall rules in sync between the two firewalls. We have failover with our isp that will move our public facing address block from our primary site to our dr site in the event of a disaster so the ip addresses will not change if we were to have to fail over to the DR site. currently i just have to do any changes that i make on the fail over server but would like a way to at least simi-automat this if not fully automat this so that i can eliminate the possibility of human error of a change happening at primary but never getting don at DR.

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Cisco :: Getting Alert In WCS 7.0.172.0 - DoS / CTS Flood

Dec 12, 2011

I have WCS 7.0.172.0 where as i have very frequent alert about DoS : CTS flood In channel 60, the system has detected 212 CTS frames in the last minute, which matches the traffic pattern of the form of denial-of-service attack, CTS (Clear-To-Send) attack. A wireless denial-of-service attacker may suspend the wireless media for communication by taking advantage of the privilege of CTS frame to reserve RF medium for transmission. By transmitting back to back CTS frames, an attacker can force other wireless devices sharing the RF medium to hold back its transmission until the attacker stops transmitting the CTS frames. The system detects the abuse of CTS frames for denial-of-service attack.  

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Cisco Firewall :: ASA5520 CSC-SSM Failover Sync

May 17, 2012

I have a pair of ASA5520, each has a CSC-SSM module, all specs and licences match and the ASA failover between active and passive firewalls works as expected. However, I am unable to get the two content modules to sync. ASA are running 8.4... and attach diagram show cabling. Each CSC-SSM uses it's connected port as a gateway, although I've tried using both primary and standby IP.
 
When I try to sync the devices as per the Trend Micro instructions I get the error: "InterScan for CSC SSM could not establish a connection with the failover peer device. Please verify network connectivity with the peer and that the peer is functioning properly, then try again."
 
All interfaces are up/up. I cannot see the other CSC-SSM in either ASA's arp table. Neither CSC-SSM can ping the other, and none of the guides I've found so far details the pre sync config of the CSC-SSMs.

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Cisco Firewall :: Difference ASA5510-BUN-K9 And ASA5510-Sec-Bun-K9

Jun 6, 2012

ASA 5510 have two model Bun-K9 and Sec-Bun-K9 from the datasheet find out difference Port related and Redundancy. My questions is : Have any major difference for Security service between two model ?

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Cisco Firewall :: 8.0.4 / ASA Failover Configuration Sync Infinite Time

Nov 15, 2011

We have ASA running code 8.0.4 with Active/Standby for quite long time. Today when we gave the command wri standby it started sync the config to standby ASA but waited forever.when we checked the show failover, we got the following result.
 
This host: Secondary - Active
Active time: 1928633 (sec)
slot 0: ASA5540 hw/sw rev (2.0/8.0(4)) status (Up Sys)
Interface PERIMETER-MGMT (10.12.8.1): Normal (Not-Monitored)
Interface OUTSIDE (86.36.xx.xx): Normal (Waiting)

[code].....

When we console to Standby ASA and tried to save (wri mem), we  got the following error and also please note the hostname has become default...?

ciscoasa(config)# wri memory
Building configuration...
Command Ignored, Configuration in progress...
[FAILED]
 
and when we tried to give following command we got this error:

ciscoasa(config)# copy running-config startup-config
Source filename [running-config]?
%Error reading system:/running-config (Configuration temporarily locked)
ciscoasa(config)#
 
I see here the standby ASA IPS module is down, but can that issue cause not sync the config backup and writing to nvram (save config)..?

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Servers :: How To Block IP User Not To Flood Chat Room

Feb 4, 2011

I have an chat room and have a problem with 2 chatter who keep on flooding my room. I need a good mode to set for me to Bann then life and all my modes I am using its not good and they keep on coming back with their IP or fake ip users

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Cisco Firewall :: 5510 Exchange Active Sync Stops Working

May 8, 2012

I know that I've run into this before but I can't remember the fix.  I have a 5510.  The 3 interfaces involved are INSIDE, OUTSIDE, and GUEST. Corporate users are allowed to put their iPhones on the Guest network, but the problem is that their Exchange ActiveSync stops working.  It is tied to the external DNS name of the OWA server (we'll say webmail.abc.com).  So the users are funneled out one public IP on the OUTSIDE interface and are trying to communicate with the outside of the OWA server, which is NATed to another public IP on the same outside interface.  What do I need to do on the ASA to allow users on the guest network (behind the GUEST interface) to access the mail server using its public IP (behind the INSIDE interface)

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Cisco Firewall :: 6509 - Standby FWSM Stuck In Sync After Reload

May 8, 2011

We have a setup of FWSMs configured in single mode in 6509 chassis. Both 6509 are configured in VSS. Recently I have upgraded the firmwre from 4.0(3) to 4.1(3).....before upgradation config sync was not having any problem.
 
After upgradation...If any one of the FWSM reload..while coming up it gets stuck in config sync and no command we can run on any of the unit and get the error as..
Configuration update in progress by another process. Also on stannby fwsm no running-config displays.
 
If we used # failover suspend-config on primary and then reloads the standby fwsm...standby boots up with startup config and when  # no failover suspend-config command runs on active fwsm..the sync started and completing succssfully within 15 sec..
 
Also failover works well..with #no failover active..

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D-Link DIR-655 :: Detect / Stop DDOS Attacks With It?

Mar 22, 2013

i can detect the IP of DDOS attacks and if there's a simple way to prevent it.  I've heard different suggestions from blocking incoming ping requests to blocking specific IP ranges

running 2.03 firmware

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Cisco Switching/Routing :: Unicast Flood On 3750 - How To Determine Source MAC Address

Feb 27, 2013

There is a unicast flood on 3750 killing slow modem links. How to determine source MAC address of flooder? Is there a rate limit feature for it?
 
I know how to block it completely on port-level, but it breaks normal network operation. (when port goes down for some reason, it's learned MACs got flushed and since other hosts know MACs, they keep flooding untill their arp caches expire).

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Cisco Firewall :: ASA5510 - Unable To Ping From User Desktop To Firewall Inside IP

Jun 11, 2012

I am able to ping from Switch to firewall inside ip and user desktop ip but unable to ping from user desktop to  FW Inside ip.. config is below for both switch and FW Cisco ASA5510....
 
TechCore-SW#ping 172.22.15.10
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.22.15.10, timeout is 2 seconds:

[Code].....

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Cisco Firewall :: ASA5510 Secondary Firewall Crashes After Upgrade To 8.4.1

Jun 29, 2011

I have two ASA5510's set up in failover, and the secondary keeps crashing after doing the interface checks when bringing failover up. This only happens if I try to upgrade the image on the secondary to anything newer than 8.4.1 (I've tried with 8.4.1-11 and 8.4.2). The primary one run just fine with new images.
 
I don't have the exact error right now, as I need to do a screen capture from console. It's just a huge crash dump.Are there anything I might have missed during the upgrade? Should I cold-boot both the firewalls in the correct order?

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Cisco Firewall :: ASA5510 Firewall Transparent Mode

Sep 10, 2012

i have a ASA5510 in the office, that already configured 3 context, namely, admin, user, server.in the server context, the last running config was not saved, and there was a power trip last friday night. 1 of the sub interface was affected, and i need to recreate that interface.I am getting the below error, it only allow me to do changes those pre-defined interface.how to I create extra sub interface?

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Cisco Firewall :: ASA5510 Firewall Interface Speed

Jul 21, 2011

I have a ASA5510 and I have a question about the speed the ports can handle, here is one port:
 
-interface Ethernet0/2
- speed 100
-shutdown
- no nameif
-no security-level
-no ip address
 
it's ethernet and not fastethernet so I figure it will only go to 10Mbps, but at the same time I can hard code the speed to 100.

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Cisco Firewall :: Memory Upgrade Of ASA5510 Firewall

Feb 22, 2012

i have cisco ASA 5510 Firewall using  in my network, i have  planning  to upgrade the Flash  memory  from  256 mb  to  512 mb  and   the RAM  from 256 mb to  1GB.

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Cisco :: 4404WLC - Causing DOS Attack Several Times A Day

Feb 12, 2013

I manage a CISCO 4404 WLC with about 46 access points across our WAN. System works very well, serving trusted users, guests etc very well.However, over the last month or two we have had an issue where we have had high load on our WAN.We have traced this down to the CISCO 4404, about 3-4 times a day, the controller connects to every access point and transmits about 5-8mb of data on port 5427. This in itself would not be a problem, but it connects to all 46 at the same time.

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Cisco Firewall :: Different Between ASA-5520-K9 And ASA-5520-K8

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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Cisco VPN :: Establish Site To Site VPN Between ASA5510 To 5520

Jul 26, 2011

I'm trying to establish site to site VPN between ASA5510 to ASA5520, scenario. [code] our Vendor said to nat the local network to specific ip and use that ip as local pool,here the configuration details [code] i create static nat but its doesn't work for me phase 1 is not up, how to create nat local network to 10.10.10.10.

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D-Link DIR-615 :: Xmas Port Scan Attack From WAN

Jan 21, 2011

I'm on my 3rd Virgin media 615 today, the last one arrived yesterday and I opened the box to fine a rev d with old bios installed, throw hands in air and all that and then proceeded to upgrade to 4.13 which I have found to be stable and work ok, the other two grow to have the wireless failure issue, I could moan here about VM but hey there's no point so I have come here for adviseafter I found the last one wireless going down, daily trips from the kids down to me to ask why the internet isn't working etc etc I started to investigate, I found the 4.13 and gened up a bit, looked at the 3rd party code and came back to Dlinks own code, anyway I have seen in the last few days hundreds of similar port scans. [code]

Now is the the router being a little sensitive to harmless software companys scans to see if products installed etc or are they something to worry about now I know whats going on if its the latter, and I don't think anyones got in yet but I would like to ban these ip's and to be honest I'm not sure of the best way also I noted a UDP active session that not a part of my subnet too mine being a standard 192.168.0.*and the other being 192.168.4.*.

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Cisco Firewall :: Asa5510 - How To Add Secondary Firewall

May 4, 2012

I have a cisco asa 5510 with security plus license in Live enviroment . I need to add a secondary firewall . I was planning to do in active /standby mode for failover .But i have a doubt , when i do "show version " on live asa output says Active /active failover , does this means that i can only configure failover in active/active mode not in active/standby (which i want to do )?

Maximum Physical Interfaces  : 8
VLANs                        : 20, DMZ Unrestricted
Inside Hosts                 : Unlimited
Failover                   : Active/Active
VPN-DES                      : Enabled
VPN-3DES-AES                 : Enabled
VPN Peers                    : 25
WebVPN Peers                 : 2
Dual ISPs                    : Enabled
VLAN Trunk Ports             : 8
AnyConnect for Mobile        : Disabled
AnyConnect for Linksys phone : Disabled
Advanced Endpoint Assessment : Disabled
UC Proxy Sessions            : 2

This platform has an ASA 5505 Security Plus license...

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Cisco Firewall :: RDP Access Through ASA5510 Firewall?

Feb 12, 2012

i  am  using Cisco ASA5510 Firewall  in my  Network in the distrubition Layer .Private Range of Network Address  use  in the Network  and PAT  at the FW for  address translation.presently  encountering an issue  the users  behind  the FW  in my network  unable to  RDP  at port 2000  presented  at the Client Network.Able to Telnet  on port2000 but  not RDP .  any changes needed at the FW end  to  get the RDP Access.

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Cisco :: 4402 Light Weight APs Drop Out After Land Attack

Sep 12, 2012

We have a WLAN consisting of a WLC 4402 and 11 lightweight APs. For security/compliance reasons we have a Cisco PIX firewall that sits between the WLC (outside) and the APs (inside). The APs are allowed to form LWAPP tunnels through the firewall (inside access-list) to the WLC and the WLAN works as expected.The firewall then limits traffic from the WLAN (outside access list) to certain the internal systems.I have noticed that every so often the firewall logs show continuous "Land attack from 0.0.0.0 0.0.0.0" messages then all APs are disconnected (all lights flash).

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