Cisco Firewall :: ASA 106001 Error Most Likely Due To Interface Subnetting

Sep 16, 2012

I have a slew of 106001 messages coming into ASA log, from the outside interface. it appears like most of them are for standard traffic, such as TCP 80/443. i suspect these messages are from clients on the inside who have initiated connections to the internet, but then the client abruptly terminates application of something similar. Server side finally issues a close connection, reset or something else. Here is an example, with the ASA address being (changed to protect the innocent ).
Another theory is that the NAT ip for clients is different than the actual interface IP, so that is behaving differently. For example, once the xlate times out, the IP used for the xlate is no longer active and any return packets to the interface would also error out - be refused. If the xlate was using the interface IP, that it would always respond in some way?
I can bump 106001 down to notification (5) or informational (6) level.

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Cisco Firewall :: 5540 ASA Interface Input Error On Outside Interface

May 28, 2013

We are having Cisco ASA 5540 having Cisco Adaptive Security Appliance Software Version 8.0(5)23 at certain time of moment daily wer are facing latency and packetdrop wherin when I checked for ASA Interface which gives me " Input Errors" on outside interface ,so can any one tell me what are the causes to get input errors on cisco asa outisde interface.

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Cisco Firewall :: ASA-3-106001 - Inbound TCP Connection Denied From Flags SYN

Jun 24, 2012

I have 2 cisco routers that resired on the same interface on Cisco ASA. For security reasons, on both of the routers I have configured default gateway to be ASA interface, then static route between them on the ASA, I get the following error when on station comming from first router trying to connect to another station behind secound router (again, on the same interface, maybe this is the issue?).
ASA-3-106001: Inbound TCP connection denied from flags SYN
There is access list allowing traffic between but hit count is 0

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Cisco Firewall :: ASA 5520 - 106001 Syslog Events For Internal Hosts?

Jul 26, 2011

I've just taken over a new network with a Cisco ASA5520. Everything is working fine, except I am being bombarded with 106001 alerts from a few internal hosts to one specific internal host. The description in general is "Inbound TCP connection denied from to - both of those are valid internal hosts and the TCP ports are also valid. I tried looking at the log and getting it me to tell me which rule was causing these alerts, but it just came back with 'It's not possible for these type of alerts'
- How is it possible for the ASA to even pick up on this when, in theory, the source host wouldn't be going near the ASA since it's on the same subnet?

- What might be causing this?

- How can I turn it off!! (I guess that'd be fixed by point 2)

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Cisco Firewall :: Enabling RIP On PIX 535 / Error / OSPF / RIP Cannot Be Enabled On Failover Interface

Jun 29, 2012

I am getting this error on my PIX 535 with 8.0.4 code. The error is Error : OSPF/RIP cannot be enabled on failover interface, I am getting this error while trying to enable RIP on the firewall. The context is single mode and failover is enabled. When I am disabling the failover the Firewall is accepting the RIP configurations.

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Subnetting A Class C Ip Address?

Dec 13, 2011

I am looking a old exercise I did last year about subnetting and I am wondering if is possible to subnet: /22

I wrote down, last year, that:

16 bit are assigned to network
6 to subnet
10 to hosts

when actually I see a class C ip address with 10 bit assigned to hosts. So, how many bit do I have for network, subnet and hosts?

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Understanding Subnetting And Classes?

Dec 8, 2012

I am currently trying to understand Subnetting via CCNA. My progress is going well,I understand the class below:

Class A 0-127 Max IP 2^24 = 16777216
Class B 128-191 Max IP 2^16 = 65536
Class C 192-223 Max IP 2^8 = 256

However I have seen an example from an ip calculator website, and noticed this :

Address: 11000000.10101000 .00000001.00000000
Netmask: = 16 11111111.11111111 .00000000.00000000
Wildcard: 00000000.00000000 .11111111.11111111
Network: 11000000.10101000 .00000000.00000000 (Class C) - I would have thought this would have been Class B?
Broadcast: 11000000.10101000 .11111111.11111111
HostMin: 11000000.10101000 .00000000.00000001
HostMax: 11000000.10101000 .11111111.11111110
Hosts/Net: 65534 (Private Internet)

Is this an invalid IP/masks as the max hosts is 65534 (which should be class B?). If so shouldnt the IP address range from 128-191- eg 172.16 (I know that CIDR is the amount of 1's. ).What calculates the class is it the netmask or the range of the first octet?

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Cisco :: Subnetting Directly Connected Networks?

Feb 29, 2012

Why isn't it possible to make following configuration:

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Cisco :: Subnetting According To Number Of Hosts VLSM

Jun 1, 2011

you can subnet to meet the number of networks required, or you can subnet to meet the number of hosts required. In which circumstances would you use either one? or are they both the same? am kinda confused.Is subnetting according to the number of hosts VLSM? and subnetting according to the number of networks required is not VLSM subnetting? Also I'm on CCNA 1 chapter 6, if the other CCNA 2, 3 and 4 has chapters explaining subnetting better cos It's totally confusing me atm.Also, is my understanding correct, when a company wants a LAN made, a network designer see's how many hosts they require in each of their LANS and then chooses an appropriate address class and subnets it? and to connect the LAN to the internet he implements NAT on the router that connects to the internet, and that router translates the internal addressing scheme that was created into a public registered IP address from an ISP? Also does he just make the address up? for example if he decides to use class C, he just picks any random number in the class C range and subnets it?

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Cisco Switching/Routing :: Subnetting On ASA 5505

Apr 5, 2012

we currently use the ASA 5505 router. We would like to create another subnet inside our LAN because we are running out of IP addresses.
current subnet info:
we want to make another subnet, which we plan to use for all our network printers for now( other use in the future) PCs at 10.1.1.X will be able to print on the new subnet. the new subnet will be able to connect to the internet.
What's the best options we can do for the subneting? how can we configure the router? is possible to set another DHCP on the new subnet. we currently have one DHCP on the 10.1.1.X

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Subnetting - How To Calculate Network Address

Jan 11, 2012

Given the IP address of and the network mask of answer the following:

What is the network address?

What is the broadcast address?

What is the valid host IP range?

What I have done so far:

Part 1 - Broadcast address - 10101100.00010000.00001010.00010110 - 11111111.11111111.11111111.11110000

Researching different ways to find the Broadcast address I took the binary IP address and replaced all numbers with 1's for the host bits identified in the subnet mask and came up with: - 10101100.00010000.00001010.00011111

Is that the correct Broadcast address?

Part 2 - Network address

I am not sure what is meant by the network address and all my research has come up with either MAC addresses (obviously wrong) or CIDR notation...How do I calculate the network address?

Part 3 - List of valid IP's

Using the same address I did the following:

28 is closest to 32 (block wise) so 32 - 28 = 4... 2 ^ 4 = 16 (block size)

IP address listing:
and so on...

The IP address in question is and falls in the - block...

Is this the correct list of valid IPs?

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Home Network :: Subnetting A Single Static Ip?

Jun 18, 2012

I am in the process of acquiring a static ip address from my isp time Warner. I only want to pay for a single static, but I have a number of machines I want to put on the internet, a web server and a e-mail-server. Using a cisco router, a Cisco Rv 120w. Can I assign the static ip address my isp gave me to the Rv 120w and then crate a vlan to assign addresses to various computers. Or is this something my ISP does. I get the impression from the tech guy at Time Warner that this is something they do.

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Networking :: Subnetting Network DGND3700 For Increasing Performance

Apr 10, 2012

I wanna subnet my Network to increased performanced but im alil confused hereWhen looking at my ROUTER STATUS this is what i have.

gateway ip XX.XX.X.X
ip address

Which one of this ip addresses do i have to subbnet?,my router is a ,NETGEAR N600 Wireless Dual Band Gigabit ADSL2+ Modem Router DGND3700 Wireless router - 4-port switch (integrated) - EN, Fast EN, Gigabit EN, IEEE 802.11b, IEEE 802.11a, IEEE 802.11g, IEEE 802.11n.

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Cisco Firewall :: PIX 501 / Can Traffic Goes From Inside Interface To Outside Interface

Oct 9, 2011

I have Pix 501 firewall and I'm just configuring the device for "Email Server" to allowing POP/SMTP.
Inside Interface Address:
Outside Interface Address: ISP provided IP address
My question is can my traffic goes from inside interface to outside interface? (because the inside interface address not from 10.0/172./192.168 private address)Also I'm allowing internet from this email server ( so what my access list to be configured? and what my subnet mask shoud be there?
Pix(config)#access-list outbound permit tcp any eq 80
Pix(config)#access-list outbound permit udp any eq 53
Pix(config)#access-group outbound in interface inside

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Cisco Firewall :: ASA 5550 - Interface Failover / Interface Goes Down

Mar 18, 2013

I've got a ASA 5550 firewall interface failover issue. (File attached).
when I shut down the inside interface Gi 1/1 of the left firewall(Active firewall), It failed to failover. but when I shut down the Gi 1/12 of the Core 1 switch, The firewall failover very well.
I followed this guide but I was not able to failover. [URL]
how can I configure so that when the Gi 1/1 or Gi 1/0 interface goes down, it can failover ? Code...

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Cisco WAN :: 3660 Interface Always Went Down And Shows Error Message

Aug 20, 2012

I am having a problem with my cisco 3660 router. I have installed a wic 2T interface card and every time i set it to "no shutdown" the interface always went down and keep getting the following message " %FECPM-2-SCCFAIL: Init of SCC2 for int 0/0 failed to do fecpm_dma_init" .

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Cisco Switching/Routing :: Ping Loss On Nexus 3k But No Error Under Interface?

Mar 4, 2013

I'm facing a problem regarding loss of ping packets when i do ping test from nexus3k to another nexus3k connected directly.however there is no error counters on the interfaces on both of devices.the ping failutre is occurring only whenever i do ping test with a large number of ping packets.I don't see the ping loss symptom with default ping test (default ping test is 5 packets).
H/W : N3K-C3548P-10G
S/W : 5.0(3)A1(1) 
nexus3k# ping
PING ( 56 data bytes
64 bytes from icmp_seq=0 ttl=254 time=2.732 ms
64 bytes from icmp_seq=0 ttl=254 time=2.732 ms


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Cisco Switching/Routing :: C2950G / No Interface Error Messages In Logs

Sep 30, 2012

We use C2950G switches with IOS 12.1(22)EA12 . Switches are set up to send logs to a server (informationnal level). On this server, we receive many of logs from those switches, but none about interfaces errors (even if interfaces statistics show interfaces errors). On C3548 switches it's work fine.How should I be sure the set up of switches is correct ? Why do I never receive messages as %LINK-4-ERROR:[char] is experiencing errors ?

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Cisco Switching/Routing :: 1841 No Error On Connected Switch Interface

Feb 18, 2013

We are using Cisco Router 1841 and users reporting issue related to VoIP. After investigation, seeing input errors on Router LAN interface, but there is no error on connected switch interface. [code]

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Cisco Wireless :: 1130AG IOS Error Interface BVI Ethernet Dot11Radio0 Changed

Nov 12, 2012

Several 1130AG AP, auto IOS, are showing the same three errors;
1. 'Error' Interface BVI1 Changed to up
2. 'Error' Interface Fast Ethernet0 Changed to up
3. 'Error' Interface Dot11Radio0 Changed to up
Why these interfaces coming 'up' would be an 'error'? Seems almost like hardware failure/s. So we have been investigating on several 1130AGs bought from different places, with different configs and still get the errors. The APs appear to 'work' (i.e. basic config, wireless working, clients assoss., data flows to internet and back through APs) but the error causes the event log to show 'error' and for the status LED to turn 'yellow', instead of 'light green' (light green when working normally and no clients assos).
I have worked with many cisco APs and never ran across these two errors.
At first I thought it was a power issue, as the AP will boot up in low power if it doesnt think it's getting enough power, which could cause the IOS error possibly. But all of our APs are powered by wall plug cisco 48v OEM plugs, no POE injectors or switches. We even changed the settings in power of the IOS to 'pre-compatiable' POE and similar and still recieve the error and yellow LED status light. We looked into this power issue because we wanted to rule out if these was what was producing the errors that were reporting.
The second thing we did was setup the test APs with a very basic config, one ssid, no security, as to rule out a config error and also, no config will make the radios disabled, so without a basic config the APs cant be tested anyway (since the radios are now disabled from default). so we tested very basic configs and still getting the error and yellow LED (which all manuals say it should be light green normally working and no clients). all config changes brought wireless up and we can connect clients and data flows but still the errors stay and yellow LED once all clients disconnect. Note; when clients connect the yellow LED turns to light green, but thats not the colors the manual states they should be which is odd).
Third, a couple engineers suggested this error was from the AP scanning channels to choose the least congested (default config) and it will pick a channel but produce this error still and go yellow. We changed the configs to the least congested channels and it reboots and still gets these errors.
We have tried several IOS software packages, some newer, some older, all auto. though, no LAP.
We googled the errors but could only find ONE post with these errors. Some engineers said these errors are 'normal' and they have seen them before, but theres nothing on the web about the errors and we have owned 20-40 different cisco IOS APs and never seen this, and we have the same issues with 4 1130AGs, all in almost new condition, bought from different places.
Unless you have opened a 1130 many people dont know  the status LED is actually 3 LEDs (one assembly with 3 micro LEDs, blue, green and red) that combine in color (the micro LEDs light up in different intensities causing many final color combintations), and the LEDs colors mix together via a plastic light guide on the top to show the status LED, and we believe the error is causing the status LED color to be off because the error is making the yellow light up and mix with the other colors causing all the other colors to be incorrect. we have researched trying to clear the error by 'clear logging' CLI command, hoping that may clear out the interface error and turn the yellow LED off because there would be no log of the error, but we have not succeded.

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Cisco VPN :: PIX501 / Binding Inside Nat Statement To Outermost Interface Error

May 13, 2013

I am having a problem w/ my PIX501 w/  "Cisco PIX Firewall Version 6.3(4)", upon issuing the command i get this WARNING, is this normal? because it works perfectly fine in version 7.2(2)..

PIX1(config)# nat (outside) 1
WARNING:  Binding inside nat statement to outermost interface.
WARNING:  Keyword "outside" is probably missing.

PIX1# sh nameif
nameif ethernet0 outside security0
nameif ethernet1 inside security100

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An Error Occurred While Releasing Interface Wireless Network Connection

Feb 24, 2011

OS: Windows Vista Home Premium?Trying unsuccessfully so far to reconnect a client machine to a wireless network that it has been on for a year or so.ISP was down for about 2 hours the other day and when it came back up, the client machine started getting the IP address conflict. Went in to release and renew and got the following error messages:

on release: An error occurred while releasing interface Wireless Network Connection: An address has not yet been associated with the network endpoint.

on renew: The DHCP client has obtained an IP address that is use on the network. The local interface will be disabled until the DHCP client can obtain a new address.

The next thing I tried was to go in an give a manual IP address to the Wireless Adapter. But the TCP/IP properties are greyed out and I receive the following error message:Some of the controls on this property sheet are already open. To use these controls, close all these property sheets and then reopen this one.

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Cisco Switching/Routing :: C3500 XL Version IOS 12.0 / Error Add Interface Port-channel

Jan 15, 2012

a Customer ask me  to configure a etherchannel between two Switches C3500 XL Version IOS 12.0 follow the first configuration what I done and the output error show me by switch:

Sw01(conf)# interface port-channel 1  % invalid input detected at '^'  marker.   

I have to do something before add an new port-channel interface ?? why the Sw01 does not accept my configuration ?

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Cisco Firewall :: Failover ASA 5505 - Setup Second Inside Interface On Firewall?

Feb 19, 2012

I have a Cisco ASA 5505 in our office. We are currently using Interface 0 for outside and 1 for inside. We only have 1 Vlan in our environment. We have two three switches behind the firewall. Today the uplink to Interface 1, to the firewall, on the switch went bad. I want to setup a second inside interface on the firewall and configure it as failover incase this happens again. I want to attach it to the other switch. Can I do this? If so, what do I need to do? would it only be a passive/standby interface?

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Cisco Firewall :: ASA 5520 - Routed Management Interface On Transparent Firewall?

May 5, 2013

I have an asa 5520.  How would I configure my dedicated management interface to be able to route off subnet while the firewall is in transparent mode?

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Cisco Firewall :: 3945 / Zone Based Firewall And WAN Interface ACL?

Mar 16, 2011

I am getting ready to deploy a 3945 ISR to serve as an internet and core router for and remote site.  I will be terminating a site-to-site VPN tunnel on it and also configuring a zone based firewall config between my "outside" (internet link) and "inside" (all internal nets).  My question is about how to approach securing the WAN interface with the Zone based FW in place?what kind of ACL do I need beyond those allowing and restricting remote access to the outside ip? 

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Cisco Firewall :: ASA5505 Can't Ping New Firewall On Inside Interface

Jul 14, 2011

I've recently upgraded my old firewall from a PIX to an ASA5505 and have been trying to match up the configuration settings to no avail. I have is that I can't ping the new firewall on it's inside interface, despite having "icmp permit any inside" in the running config. Secondly, the server I have on there ("Sar") can't connect out to the internet.I've included the ASA's running config incase anybody can see if something stands out. I have a feeling it's either not letting anything onto the inside interface, or there is no nat going on. Lastly (and possibly relevant), the firewall is actually going at the end of a vlan, which is different to the firewall's inside vlan number. I don't know if this is actually the problem because the server can't connect out even if connected directly into the firewall.

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Cisco Firewall :: ASA 5505 Creating Interface Vlan In Firewall

May 3, 2011

I have been working with ASA 5510,20,40,80 but not with 5505 this vlan and its interfaces are quite confusing.Just want to know how it works and its connectivity to Cisco Switch.Do i have to put the interface of the switch in the same vlan as i am creating the interface vlan in firewall ?Now the switch port connecting to this Eth1 interface should also be in the same vlan ? i.e vlan3 ?? or it will be in trunk ? The default configuration shows the eth0 with no access vlan and interface eth1 with access vlan 2... does it mean the eth0 is in vlan1 ? (Nativ Vlan ) ???

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Cisco Firewall :: 6509 ICMP Echo From Firewall Interface

May 1, 2011

two 6509 chassis with VSS configuration.One of those chassis have one FWSM installed and the configuration is like this:
Switch: firewall multiple-vlan-interfacesfirewall switch 1 module 3 vlan-group 1firewall vlan-group 1  3-5,7,8,10,200 interface Vlan200 ip address
I am not receiving icmp replays from the fswm interfaces if i try to ping from do not see any debuging info in the logsI successfully ping from the inside networks int the cat6500, but int the network, can not ping

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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
- 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 :: Unable To See Interface On ASA 5510 Firewall?

Jul 29, 2012

I am unable to see 4th interface on my firewall i.e fastether0/3 on my firewall ASA 5510.
Below is the output.
ciscoasa# sh int ip br Interface                  IP-Address      OK? Method Status                Protocol Ethernet0/0                x.x.x.x           YES CONFIG up                    up Ethernet0/1                x.x.x.x           YES CONFIG up                    up Ethernet0/2                unassigned      YES unset  administratively down down Internal-Control0/0       YES unset  up                    up Internal-Data0/0           unassigned      YES unset  up                    up Management0/0         YES CONFIG up                    up

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Cisco Firewall :: ASA Error In Version 7.0(7)

Sep 12, 2012

%ASA-3-305005: No translation group found for tcp src inside: dst outside:,  I found this error ,but the IP is public address. I check the configuration but didn't find any information about this address.I don't understand why src is inside? How can I solve this error?

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Cisco Firewall :: Migration Error Upgrading To ASA 8.4.4

Oct 25, 2012

I was trying to upgrade an ASA to from 8.2.4 to 8.4.4, and I began receiving the following migration errors (the IP addresses have been changed to protect the innocent):
ERROR: MIGRATION: The following ACE is partially/not migrated to Real IP, as it could result in more permissive policy. Please manually migrate this ACE. permit esp host host    
I got a TON of these, in fact the migration, and these errors ran for over 24 hours before I gave up, powercycled the unit and forced 8.2.4 to boot through ROMMON.  This was a secondary unit, that's why I let it go this long.
What I don't understand is that we do not have anything in the configuration for ESP.

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