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 for some security cause.
Mar 18 21:46:19 Mar 18 2011 21:46:22: %ASA-2-106017: Deny IP due to Land Attack from to 18 21:46:19 Mar 18 2011 21:46:23: %ASA-2-106017: Deny IP due to Land Attack from to 18 21:46:20 Mar 18 2011 21:46:23: %ASA-2-106017: Deny IP due to Land Attack from to 18 21:46:21 Mar 18 2011 21:46:24: %ASA-2-106017: Deny IP due to Land Attack from to

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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 to "

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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 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 :: 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" messages then all APs are disconnected (all lights flash).

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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 :: ASA 5510 Deny TCP (no Connection)

May 17, 2012

My firewalls are running in multiple context mode.According to my troubleshooting, the problem happens because of the following things:
1- The host do a telnet to using the default gateway that is the context firewall C2;

2- The packet go to the C2 and is forward through the interface e0/0 (direct connected);

3- The packet is delivered direct to the host,without passthrough the context firewall C1;

4- The host receive the packet and return the answer to the source host using the default gateway;

5- The packet is received by the context firewall C1 and is dropped with the reason Deny TCP (no connection) syn ack;
I think the the problem is on step 4, the context C1 receive a packet that didn't pass by it before. Am I right?

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Cisco Firewall :: Network Is Super Slow After Deny Tcp Log In ASA 5510

Jun 28, 2011

I used the ASA 5510 and in these days, facing the problem is internet is very slow. When i check in real-time log viewer debugging, i found the following logs 6|Jun 29 2011|15:47:53|106015||416||80|Deny TCP (no connection) from to flags ACK  on interface Inside 4|Jun 29 2011|15:47:53|106023||852||80|Deny tcp src Inside: dst Outside: by access-group "Internal_access_in" [0x0, 0x0] a lot of log message are come out and I notice that ip is try to attack my network. In that moment, my network is very slow and nearly to be down.  When I block with that ip by access list, network is up again. But after a few moment, attack from other ip, it's so terrible and so tired to block a lot of ip by acl.

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Cisco VPN :: Selected Shell Profile Is Showing Deny Access 5510

May 17, 2012

i have got the below long on the acs 5.2,one the vpn client user connect to asa 5510
Selected Shell Profile is DenyAccess
Resolution Steps
Check whether the Device Administration Authorization Policy rules are correct

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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 :: 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" the ip address random .

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Cisco VPN :: ASA 5510 Implicit Deny Access Rule Blocking Site-to-Site VPN?

Apr 22, 2012

I've setup a site to site vpn on an ASA 5510 using ASDM (as I have many times before) and the tunnel appears to be up but I am not able to pass traffic.  When I run the packet tracer from my inside network to the remote destination network, it shows that it is blocked by the implicit deny ip any any rule on my inside incoming access list.

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Cisco Firewall :: ASA-4-106023 / Disable Logging Of Implicit Deny?

May 13, 2013

My syslog is full of %ASA-4-106023: Deny tcp src outside:---- by access-group "inbound-acl" messages.  I did not configure an explict deny for the access list to log these I can disable logging of denied connections?

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Cisco Firewall :: ASA Software 8.3 And 8.4 And Implicit Deny Rule In ACLs?

Aug 23, 2011

I have found this in documentation (the same statement for version 8.3 and 8.4):
" Access Control Implicit Deny #All access lists (except Extended access lists) have an implicit deny  statement at the end, so unless you explicitly permit traffic to pass,  it will be denied. For example, if you want to allow all users to access  a network through the ASA except for one or more particular addresses,  then you need to deny those particular addresses and then permit all  others. " 

Does it mean that now all ACLs shoud have created manualy deny ip any any rule at the end ? I have migrated one ASA to version 8.3 (no host connected and I can't test it) but after migration I don't see this rule at the end of all ACLs. Does it mean that all traffic will go throu ACLs on all interfaces ? I didn't find any information about this change in documents describing new software features [URL]

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Cisco Firewall :: ASA 6.1 Deny IP Spoof From (global) To (Static NAT) On Outside Interface

Jun 2, 2013

I'm receiving an error when trying to access a web server behind from one subinterface to another subinterface on an ASA access the public IP.  I'm getting the following:
Global Static NAT Deny IP spoof from (61.X.X.X) to 201.X.X.X on interface Outside     
Traffic dies at the firewall stating that the traffic is spoofed from the Global address (61.) to the static (201.) address.  Both bound to the outside interface. When I create a static NAT on the firewall there is no problem; however when I'm patting against the firewall to the public IP I get the denies. 

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Cisco Firewall :: ASA 5520 / Deny IP Spoof On Interface Inside

Jun 17, 2012

I'm trying to attach tacacs server (ACS Version 5.2) in server group on ASA 5520 (Version 8.4). When I test connection in ASDM (Version 6.4) between ASA and ACS it fails. The log message on ASA is:
%ASA-2-106016: Deny IP spoof from ( to on interface inside.
Packet-tracer from ASA is:
InternetASA# packet-tracer input inside tcp 4444 49
 Phase: 1
Result: ALLOW
Additional Information:
MAC Access list

What access-list or implicit rule may be the reason of denying these packets?

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Cisco Firewall :: Pix 506e Passing Traffic Even With A Deny Ip Any Any Rule

Sep 20, 2012

So I was doing some testing with my BB Playbook where I wanted to see what outside connections it tried to make during startup and whatnot. I have a pix 506e running 6.3(5). I created an simple 'deny ip any any' access list on the inside interface so that the Playbook doesn't actually make any connections, but I set up a 'capture' on the inside interface accepting 'ip any any' to see what kind of traffic I could see heading outbound from the Playbook. Well, it started off showing attempts to query DNS (and failed, naturally), but then after a couple of minutes, it tried to connect to a couple of IPs over port 443 and actually got a response!!! For the life of me, I can't figure out how this can happen. NO traffic should be allowed outbound due to my explicit 'deny' rule, but for some reason some traffic on port 443 made it past the firewall and got a response back. There are no other rules in the access list except the 'deny' rule. My PIX configuration is quite simple and I cannot see anything that would allow the Playbook traffic to circumvent the access list.

I've come to think that either RIM has found away around Cisco access-lists, or there is a bug in the Pix OS. I know it's an old appliance/OS, but still. I wouldn't think it could be THAT easy to bypass the firewall.

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Can't Make Skype Calling On Any Land Line / Cell Phone Anymore

Jun 26, 2012

I can't make skype calling on any land line or cell phone anymore. I think I Isp have blocked it. Is it possible that any isp can block ant internet calling?

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Cisco Firewall :: ASA 5505 Site To Site RTP Traffic Is Hitting Deny All Rule?

Aug 13, 2012

Got an ASA5505 connected to another endpoint running IPsec and being NAT'd at each end to a network. I can pass other types of traffic through the ASA 5505 but not RTP traffic. The moment it is NAT'd and hits the firewall rules it gets denied by the default deny at the bottom of the list.

Currently the rules are as follows
 Incoming External
allow ip any any
allow tcp any any
allow udp any any
default deny

It wont allow us to setup a voip call...however when the same call manager sets up a voip call NOT using this ipsec tunnel it works just fine.

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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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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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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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Linksys Wireless Router :: E1000 V2.1 Susceptible To WPS Attack?

Jan 6, 2012

Is the E1000 hw 2.1  with v2.1.02 susceptible to the WPS brute force attack like the E4200 is?

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Cisco WAN :: 2801 IOS / Simulating ICMP Redirecting Attack On Laboratory Network

Oct 14, 2012

I study at University of Ostrava and currently I am working on my master thesis. Its content is realization of few attacks on network. Now I am trying to implement ICMP redirecting attack by using Intercepter program. Diagram of my netwok you can see on enclosed picture (Schema.jpg). Through Intercepter program I generate packets ICMP redirect (ICMP type 5), which are successfully sent from PC Attacker, but these packets do not arrive to PC Victim and Warshark shows me messages „ Destination Unreachable (Host Unrecheable).“ When I use instead of Cisco switch non Cisco switch (for example: Edimax) or hub, ICMP redirects packets arrive to PC Victim and I can continue in the attack?
Switch is in the defautl setting
Cisco Catalyst 2960 IOS: c2960-lanbasek9-mz.122-50.SE3.bin
Set only IP address on FastEthernet interfaces
Cisco 2801 IOS: 2801-ipbasek9-mz 124.25f.bin

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Routers / Switches :: Setup DMZ By Using Home Router To Prevent Attack?

May 5, 2011

Currently in my office have a TPlink wireless router (WR1043N), and Dlink 615 router.Below is my office's network organization.Internet-->TPLinkRouter(>DlinkRouter( want to host a demo website but we are afraid our network being attacked. So we wish to implement a DMZ network to hide our internal network from outside. My question is can i setup a dmz network with the above capabilities by using home routers?

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Routers / Switches :: How To Block Smas Port Scan Attack In Dir600

Feb 13, 2011

I m using DIR600 router. from few days my router shows smas port scan attack detected. then how to prevent this type of attack.

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Cisco :: Access Deny In L3 Switch?

Jun 8, 2012

i have Cisco L3 switch configured with diff vlan and assign diff subnet for all vlan . if i connect pc to vlan 2 i am able to ping host related to other vlan

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Cisco Wireless :: 857W - Deny PC Access To Web?

May 28, 2013

I need developing a acl that can block a computer on the LAN from accessing the internet from midnight to 7am everyday. The router is a 857W, the computer is the internal gw (dialer 1 is 101 deny tcp host eq wwwwhat I need to figure out is how to add a time based acl to just this computer.

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Cisco AAA/Identity/Nac :: ACS 5.1 How To Deny Access To User

Jun 12, 2011

I have ACS 5.1.I have created the Identity Group 'Admin' and added 2 users in that, say User1 and User2.How do I permit only User1 to get authenticated when he logins in to the device?There is option to select 'UserName' while creating Service Access Policy , but I have observed that though I have mentioned only User1 in the rule, User2 is also getting permitted

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Cisco :: 3750 - How To Deny VLan To Access Another One

Dec 5, 2011

We have a 3750 which has a few vlans configured.  One Vlan is for public access wifi and another for our security system (door access, cameras, etc.).  I don't want the public wifi vlan to access the security system vlan.  How can I accomplish this in the 3750?

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Cisco Application :: ACE 4710 Deny SYN-ACK Routing Without SYN Before?

Feb 6, 2012

We've one interface on the ACE which is connected to a firewall via switch. In the same vlan is a serverfarm.

net e.g.
the server's gateway is the ACE (
the ACE's gateway is the firewall (
when a server in another net is connecting to, then the SYN is sent from the firewall directly to the server in net because the firewall has an interface directly connected. the SYN-ACK is sent through the ACE (because servergateway is ACE).
> the ACE is NOT routing this packet back to via firewall. routing-table is OK. in capture on ACE the packet is NOT displayed...
but when the server in is initiating the session, the SYN is routed through the ACE and in capture I can see the packet...
if the ACE prevents routing without seeing SYN? (anti-spoofing ect...) know, I mean really ROUTING, not balancing...

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Cisco WAN :: 2801 Way To Deny Access To A Specify Web Site

Apr 5, 2012

I have a 2801 router. Is there another way to deny access to a specify web site ( like youtube, facebook .. etc ) without create acl's with specifed ip's ? The router doesen't support url filtering. I thought to do something like redirect traffic to another site : for example if one client want to access url.. that the browser will open url...

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Cisco Firewall :: ASA 5510 - Users Unable To Access Internet Through Firewall

Feb 26, 2013

I have some problem with the ASA 5510 ver 7.0(6). My manager wants to keep this as backup. tried lots of things but still users not able to access internet nor can i ping anywhere.For example when i ping i dont get any reply.The runing config is below for ur ref :
HQ-ASA-01# show  running-config
: Saved


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