Cisco Firewall :: 12697 FWSM Shows TCP Check-sum Incorrect
Jun 13, 2012
When we setup a connection between two hosts we receive the message "TCP checksum incorrect" , This is between a settop box on the outside and a server inside the firewall. This STB used to communicate with the server on port 443 which is NAT-en to port 12697.With a new settop box image which uses on the inside and outside port 12697 we receive this TCP checksum incorrect on the Firewall with wireshark.
Strange is that on the outside of the firewall we see an MSS of 1460 and on the inside it is 1380 (don't know if there is a relation with this and the issue we have)
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Oct 15, 2012
I Have asa 5520 with the code 8.0, the mem shows 94% and the CPU shows 85%
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Sep 15, 2011
How to Configure "Incorrect password Attempts Disable login for 30 minutes after 3 successive failed attempts" on ASA-5510???
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Oct 3, 2011
I have an ASA 5520 with the Intrusion Prevention Module.The time displayed on the ASA is correct.The time displayed in all Intrusion Prevention gadgets is ahead exactly 4 hours.Under configuration, Time the Time Zone is correct, Eastern in my case. The sensor local time on the same page is correct and is grayed out.I only work in the ASDM as I am far from being a CLI person.I don't think the time being off is causing any issues, but it is strange.
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Oct 17, 2012
I have an issue on an ASA 5510 that I have noticed today, when I am using the log viewer all of the information recorded only shows the high end source and destination ports. For example
Source IP 10.10.4.69
Source Port 59886
Destination IP 8.8.8.8
Destination Port 59866
So what seems to be happening is that I am seeing only half of the connection in the log viewer, I see the side with the high end ports and not the side with the ports the application uses, this example was done with a ping. All my services are working correctly and the client sending the ping gets the response expected, it just seems I have lost the logging display?
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May 3, 2011
We have 2 FWSM modules in each 6500 switches. 1st module is having 04 firewall vlan groups with 18 vlan interfaces in a single context firewall. All are working fine with no issues. Recently we create one more vlan on MFSC and add into the same firewall module. However newly created vlan inside the FW is not able to communicate with outside and also outside users not able to reach newly created subnet. But within the firewall zones (other interfaces) it can communicate. Once we did packet capture we noticed that its hitting firewall outside interface only and when we ping we got TTL expired error. we have default routes to outside and there's no any route inside as new segment is within the firewall (no any hop).
I guess there's no limitation on number of vlans that we can assign on one firewall eventhough there is a limitation for number of vlan-group which is 16 max (but we are within that limit).
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May 2, 2013
i know in Cisco PIX til 8.2 OS, if i have Nat control disabled and ACL permitting connection from Low Secirity ( DMZ ) to High Secuurity (INSIDE) then connectino should be successful, and i dont need any STATIC identity nat of inside IP to be created.
But i have Cisco PIX 525 with Version 7.2(2) Which is not allowing connection from DMZ to INSIDE , although nat control is disabled. and giving RFP check failure, any thought?
PIT525PIXINET# sh running-config nat-control no nat-cont
packet-tracer input dmZ tcp 192.168.85.4 65000 10.34.21.25 3389
Phase: 1
Type: FLOW-LOOKUP
Subtype:
Result: ALLOW
Config:
[Code]...
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Apr 1, 2013
Can any1 tell me wat is the difference between ASA-SM1 and FWSM.
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Apr 10, 2012
I want to upgrade a pair of FWSM in active failover from 4.0(4) to 4.1(8) i just want to double check the process. i have tftp access to the primary at the minute. i cannot access the same tftp server with the standby. do i need flip over to the standby to be able to tftp the image across?
failover activehostname# changeto system
hostname# copy tftp://x.x.x.x/c6svc-fwm-k9.4-1-8.bin flash:image
hostname# copy tftp://x.x.x.x/asdm-622f.bin flash:asdm
hostname# reload
Once i have the images loaded i reload both at the same time?[URL]
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Dec 17, 2011
I am planning for an VSS in Core but firstly I need to upgrade FWSM which is at 3.2 Ver to 4.0.4 (min release) I have checked software dependencies but not sure about Hardware Dependency on Fwsm and Chassis for Eg. Rommon Upgrade on Chassis.
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Jun 26, 2011
I wanna upgrade FWSM Version 3.1(11) to latest 4.x version is this possible or i have to upgrade first to 3.2 and then to 4.x?
Is there any changes in configuration commands that i need to know? The version that 6500 running is s72033-advipservicesk9_wan-mz.122-18.SXF14.bin,an upgrade to 6500 is needed also?And if so what ios version will i put?Also which is the asdm supported version?
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Jan 15, 2012
We recently deployed a FWSM on our 6503-e boxes (w/ sup720). NAT is working (PAT) but the issue I am seeing is private traffic from remote sites is not being allowed through the FW. I was able to get the remote site to ping the FWSM itself (inside address), but no hosts behind it. Maybe an ACL issue? Also when I turn off NAT on the remote end, I can than access everything (We are NATng on both ends). Im a routing guy by nature so I will defer this to the security guys out there.
Topology
Hosts (inside/10.15.25.0/24) > FWSM (outside/public IP) -> Core Router -> MPLS CLOUD -> Core Router (NATng) - > Hosts (192.168.1.0/24)
ACLs applied to inside/outside interface
FWSM# show access-list ATX-ALLOW-IN
access-list ATX-ALLOW-IN; 15 elements
access-list ATX-ALLOW-IN extended permit tcp any any (hitcnt=222)
[Code]....
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Mar 1, 2012
know software that can show us software that shows most used websites through particular firewall?
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Jun 15, 2012
ASA running 8.2(5).When I enable ip spoofing on my network interfaces I see this getting logged:
Deny UDP reverse path check from 10.100.100.102 to 10.100.100.255 on interface SPECTRA-LAN
This is because interface SPECTRA-LAN (VLAN50) is the interface connected to the network with ip 10.100.100.0/24 but the interface do not have a ip address so it does not exist in the routing table I believe?However interface INTERN do also belong to network 10.100.100.0/24 which also is the management interface and the default route for hosts in network 10.100.100.0/24, but has no vlan.
1. move the management0/0 to SPECTRA-LAN and give SPECTRA-LAN ip 10.100.100.1?
2. give SPECTRA-LAN a ip address in the 10.100.100.0 range?
My routing table and interface list is:
Current available interface(s):
DATA-BACKUP Name of interface Redundant1.10
DMZ Name of interface Redundant1.900
GUEST Name of interface Redundant1.990
HOSTING Name of interface Redundant1.100
Infrastruktur Name of interface Redundant1.20
[code]....
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Oct 29, 2012
Does ASA 8.4.3 check the source IP address of a DNS reply and drop it if the reply address is different to that in the query?
Customers DNS server does this due to a recent change, their server now has a virtual address, but replies are sent from its physcial address. This is temporary. Their PIX is happy with this.
Replace the PIX with the ASA, DNS fails, the only reason I can see is due to the way their internal DNS operates.
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Aug 14, 2011
We have a pair of 6500s with Sup720 running 12.2(33)SXI3. Each has an ACE-20 (s/w A2(2.0)) and FWSM (s/w v3.2(15)). We have reached a limit on the number of rules we can configure on the FWSM, and have determined that we shall upgrade to 4.1(5), with ASDM to 6.2(2)F. A question has been raised regarding the s/w on the ACE-20 modules. Do we need to upgrade them as well?
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Oct 1, 2012
ASA code 8.3 and higher uses NAT objects and totally changes the NAT rule config. I am new to FWSM .... but was wondering if this comparable ? I am lookinig at upgrading FWSM 3.1(16) to a higher 4.1 version .... but have a feeling this could be a huge task if NAT config changes as with the ASA's
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May 11, 2012
am trying to config a FWSM by ASDM 6.2f.there are formerly configured interfaces and new interfaces i created.when i add a new access rule it gets added only to all the old interfaces but not to the new ones i created.
1. what wrong with the new interfces i created?
2. whats the logic of auto adding a rule to "all" interfaces , the rules are incoming rules specific to interfaces or groups , why add the to the rule to "all" intefaces?.
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May 22, 2013
We would like to decommission our FWSMs and upgrade to the ASA 5555Xs. This leads me to ask the following: What would be the most efficient way of doing this without any interruption to production? How to successfully accomplish this?
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Oct 29, 2012
our FWSM (in 6509) is not coming up, when tried to sesssion up using "Session slot 1 proc 1" command,It is giving error , "Tyring 127.0.0.11 .....connection timed out remote host not responding".
In "show mod" command output at Switch in IOS console: under Card Type Section: it is showing Model & Serial Number correctly, Under MAC address sectino: displaying some MAC address But in Online Diag Status, it showing "Unknown" for Module 1.
We tried re-seating in other slots, but of no use. Giving same error. Some of other forms are saying it is the issue with 128 Mb CF image problem, FWSM is no more reachable from 6509 IOS console. We even tried using FWSM console (using PC-Conse & LCP Console) but FWSM is not contactable.
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Apr 13, 2011
I am having two dc switches with FWSM modules installed. DC switch1 FWSM (Ver 3.2(12) is wokring as active and Secondary DC switch2 FWSM (ver 3.2.(12) is in standby mode.
From yesterday I am trying to login primary FWSM, It is accepting my username and credentials but prompting again for username please refer below
DXB-DC1>session slot 5 p 1The default escape character is Ctrl-^, then x.You can also type 'exit' at the remote prompt to end the sessionTrying 127.0.0.51 Open. [code]
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Feb 3, 2012
I have had a strange issue with a pair of FWSM's in 2 6500's, it seems there was a failover but both module's have been reset.
CAT1
Feb 03 17:08:46.525: %SNMP-5-MODULETRAP: Module 8 [Down] Trap Feb 03 17:08:46.522: SP: The PC in slot 8 is shutting down. Please wait ...Feb 03 17:09:01.525: SP: shutdown_pc_process:No response from module 8 Feb 03 17:09:11.382: %C6KPWR-SP-4-DISABLED: power to module in slot 8 set off (Reset) Feb 03 17:10:56.093: %DIAG-SP-6-RUN_MINIMUM: Module 8: Running Minimal Diagnostics...Feb 03 17:10:59.796: %SVCLC-5-FWVTPMODE: VTP
[Code]...
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Jul 9, 2012
Can I upgrade FWSM 4.0.3 to 4.0.17 with Chassis IOS s72033-adventerprisek9_wan-mz.122-33.SXH4.bin ?
In chassis's slot we have ACE and FWSM slot also. if I will upgrade chassis it will reboot ACE too.I do not want to reload Chassis.
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Sep 27, 2012
I'm running two C6509 Chassis with FWSM and ACE module install on each chasiss.I have no problem with session into 1 FWSM and 2 ACE modules.But 1 FWSM module can't be access by session command.As I understand two FWSM module status is OK, and working fine.When I tried to session into FWSM, I got these messages..
[code]....
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Jan 11, 2010
I need to upgrade the fwsm image from 3.1(10) to 4.0(8). Can i do it directly from 3.1(10) to 4.0(8) ?Do i need to upgrade other image also along with Firewall version 4.0(8)?
[code]....
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Jul 16, 2011
I think I got a strange behavior on a context of my WS-SVC-FWM-1 (on a Catalyst 6509 running IOS 12.2(18)SXF17a) that is running FWSM Firewall Version 4.1(3). This context sends these log messages every ten minutes:
Jul 17 2011 23:31:16: %FWSM-6-302010: 0 in use, 0 most used
Jul 17 2011 23:31:17: %FWSM-6-302010: 2245 in use, 107133 most used
[code]...
If I issue the "show conn" three seconds later the log message, the output I got is: FWSM# sh conn 1041 in use, 107133 most used
In another context on the same FWSM the log message sent every ten minutes is just this one:
Jul 17 2011 23:31:17: %FWSM-6-302010: 1358 in use, 72503 most used
Jul 17 2011 23:41:22: %FWSM-6-302010: 1590 in use, 72503 most used
In this case there is no the log message where the "in use" field and "most used" field are 0 (zero). why does the context send the message with the "in use" field and "most used" field 0 (zero).
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May 17, 2011
I have attached a drawing of our network. We have two 6509's connected to two Cisco 2811 (onsite) that the ISP owns. I am trying to get one side up and running before I worry about redundancy and so forth. For this reason I have set all the HSRP priorities to 110 on the left 6509. I have HSRP running between the ISP routers and V LAN 101 of the 6509's. This works as I can ping yahoo and Google just fine from the 6509 switch. I can't get from my laptop connected to V LAN 23 to the internet.
It doesn't even attempt to NAT as there are no translations. I have public address assigned by my ISP configured between the ISP routers and my 6509 on V LAN 101. I then have the public address assigned to V LAN 100. I configured V LAN 100 on the switch and V LAN 100 on the FWSM with the IP address in the drawing. I have my NAT statements and route in my FWSM according to the drawing as well. On the switch, I have a default route to X.X.12.19 which is the VIP between the ISP routers. I can reach anything on the inside of my network, including the old network addresses from V LAN 23.
1. Is it best to do NAT at the FWSM or should I do it on the MSFC connected to the ISP routers?
2. If I have to configure NAT at the FWSM, does this requires me to extend the public network down to the FWSM?
3. I'll take any examples you may have as I am stuck.
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Dec 20, 2012
We run a 6500 with an FWSM with multiple security contexts as well as cascading contexts with a "shared V LAN" . There is a problem with regards to Linux machines and our shared network.
For example, we have three Linux machines in production, each in three separate V LAN's. For me to communicate to these boxes from one V LAN to another I must first ping the server. If I do not ping the server it will not bring up a connection like ssh or HTTP, etc. Below is the error I get from the FWSM that hosts the Linux server, but like I said once I ping the server the error goes away. We only have this problem with Linux machines, and it is a problem for all three of them. Is the FWSM having issues understanding something with all three Linux boxes? Below is the error I get at first, when I try to SSH from one V LAN to another V LAN with the Linux machine.
6 Dec 21 2012 16:33:54 106015 10.255.12.109 22 10.255.1.30 63000
Deny TCP (no connection) from 10.255.12.109/22 to 10.255.1.30/63000 flags SYN ACK on interface inside.
Below is what happens when I initiate a ping to the Linux Server and then ssh again. Notice it builds the connection with no problem after the ping. During the ping it builds the dynamic translation, and then when I ssh it builds the TCP connection. Do you know why this could be?
6 Dec 21 2012 16:35:08 305009 10.255.12.109 10.255.12.109
[Code]....
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Aug 10, 2011
i allowed one of internal ip using static nat and public ip is 203.18.137.22 and i want to check which IP are hit this public ip ?Is there is any command to check which ip is hitting 203.18.137.22? I have the cisco 5520 asa firewall.
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Nov 22, 2012
Is there a way to check the hardware status of an ASA 5505 ? I am thinking of a command or a script to execute.
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Feb 28, 2012
i am using asa821-k8.bin image, in my cisco 5520, How can i check if my IOS is vulnerable ?
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Sep 23, 2012
I have a cisco asa 5520 and suddendley in my Network Monitor tool,(using SNMP) asa's DMZ interface traffic is showing arround 90000 Kbit/s .
i want to check which traffic is flowing throgh this interface.(Ip address details)
Note : There is no impact on asa CPU usage.
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May 18, 2011
I have an FWSM running in multiple context mode running 3.2(18) code. I have 3 urls that I would like to block so I can't justify the cost of an external URL filtering server. I have found a way to filter individual URLs on the ASA but the same configuration does not seem to be available on the FWSM. At least not on my code. Any way to do this other than resolving the hostnames and blocking the current IP addresses?
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