CSM3.1 device addition of IOS IPS router

Upon adding a IOS IPS device running (C2800NM-ADVIPSERVICESK9-M,Version 12.4(15)T1,)& 5.x-303 release signatures, CSM 3.1 does not display it as an IPS enabled device. The device in question (2821) has a stand-alone config and 5.x advanced signatures functioning properly.
In the device properties of CSM 3.1 of said 2821, IPS is a feature but is grayed out. I have successfully added 2 ADSM modules from our 6513's and it displays them as IPS devices and I can add/deploy signatures to these devices. However, CSM 3.1 does not recognize the 2821 as an IOS IPS device and I can not add/deploy to this device. What am I missing here?

In this case you will need to create a new device in CSM (using the Add Device option) and discover the device for the IOS IPS policies to show up. Just doing a rediscovery of an existing IOS device will not show the IOS IPS policies. This is because CSM treats the IOS IPS device as a different target type than a IOS device.

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IOS IPS/IDS on a BGP Peering Router?

We have a pair of BP peerings between our network and our upstream service provider. Since the peering points are geographically distributed and we run a "cold potato" routing policy on our network we cannot guarantee symmetric routing for traffic exchanged with our upstream service provider.
Yesterday we followed the bouncing ball through the IPS/IDS setup documentation on a Cisco 2901 running 15.2(4)M3 and acting as a BGP speaking peering router at one of our peering points. Immediately the router started throwing %IPS-6-SEND_TCP_PAK and %IPS-6-TIMEOUT_EVENT messages in the logs. We also observed that some upstream service provider web sites became inaccessible to our users. Turning off IPS/IDS on the 2901 restored connectivity for our users to those web sites.
Three questions:
Do the default Cisco IOS IPS/IDS rules assume that the router will see both sides of each TCP session?
Does the Cisco IOS IPS/IDS TCP stream reassembly assume an attack and send TCP RST frames when it doesn't see both sides of a TCP session?
Should we move the Cisco IPS/IDS functionality from the BGP-speaking routers at peering points to our customer sites, as the customer sites are the only places in our network guaranteed to see both sides of a given TCP session? (We already perform NAT on the customer site routers for that reason.)

Hello Bill,
1) Yes, there are some normalizer functions on some IOS-IPS signatures that will behave like that with this scenarios (Asymetric routing not something good to any kind of security device)
2) Yes, it will close the connections, I will definetly need to look for specific actions regarding that but you could just check the IOS IPS Signature statistics on your router , see which is the one triggering the most and then see the action configured for it (and change it if required)
3) If you cannot change that behavior then it would be safe to tell the router is not a good place to set an IPS or any other kind of firewall configuration unless you set with a weaker security policy (useless from a security standard point of view)
Check my blog at http:laguiadelnetworking.com for further information.
Cheers,
Julio Carvajal Segura

Correct procedure to update IOS IPS signatures on 2911 router

What is the correct procedure to update the IOS IPS signatures on an 2911 router?
I know how to download the signatures file (eg. IOS-S556-CLI.pkg) but what is the correct way to install the update?
Thank you in advance!

The IPS signature package comes with a list of pre-enabled signatures, hence Cisco does not recommend enabling a lot more other signatures, especially not every single signature as documented.
The reason why is because the package might include retired/old signatures only for references, and not every single signature is required to protect your environment because you might not have the traffic for some signatures, you might not have some end hosts that are written with specific signatures, therefore, it becomes irrelevant if you enable it.
Typically here is how customer would enable/disable signatures:
- Use the default signature that is enabled by Cisco (the default should fit majority of the customers).
- Monitor it for a couple of months
- Disable those that you don't need, and enable others if you think you require it for specific.

IOS IPS 3845 router

The IOS IPS keeps failing. For some reason it sends the alerts to MARS and then all of a sudden the IPS is disabled on the interface. This config. was down through SDM.

CS-MARS also integrates tightly with Cisco's premier security management suite, Cisco Security Manager (CSM). This tight integration maps traffic-related syslog messages to the firewall policies defined in CSM that triggered the event. Policy lookup enables rapid, round-trip analysis for troubleshooting firewall configuration-related network problems, policy configuration errors, and fine-tuning defined policies.
http://www.cisco.com/en/US/products/hw/vpndevc/ps4077/prod_tech_notes_list.html

IOS IPS Important Notice - UPDATED

IOS IPS customers running version 12.4T, 15.0M, or 15.1M - a critical software defect has been identified which may cause your router to reload and be stuck in a boot loop if IOS IPS signature version S639 or later is installed on the device. Recovery of impacted devices is possible only via a serial console connection through the device's ROMMON mode. For customers who are using IOS IPS signatures S638 or earlier, there is no issue. Customers wishing to upgrade the IOS IPS signature version to S639 or later must first be running a fixed version of IOS on the device prior to upgrading the IPS signatures. Fixed versions of IOS include: 15.2(4)M, 15.1(3)T4, 15.2(3)T1, 15.1(4)M5, 12.4(24)T8 and later. Please refer to defect CSCtz27137 for additional details and steps to recover impacted devices.
If you have upgraded your version of IOS to 15.2(4)M, 15.1(3)T4, 15.2(3)T1, 15.1(4)M5, 12.4(24)T8 or later you can obtain the most recent signature updates by contacting the Cisco TAC

What is the most recent version of IOS IPS sig file that TAC can supply?
I'm running IOS 15.2(4)M1 and, per your suggestion above to contact TAC for the most recent signature update, I requested a later version of IPS sig than S636.
I was simply referred back to the standard download page and IPS sig file S636.

IOS IPS auto-update

Hi,
I have a couple of questions I hope people could answer:
1) What recommendations/options are available for downloading signature files to a HTTP/TFTP server prior to having the IOS IPS device pull them from the server? Is their a way to automate the HTTP/TFTP server downloading the signatures? (Cron job or such)
2) Does the signature file name change each time a new signature file is released? If it does, would I have to go back to the router to update the URL string that is configured in the ip ips auto-update section? I would hate to have to update 200 CPE devices each time a new signature file is released.
Hoping someone could answer these or help point me in the right direction to find the answer out.
regards M

I found this link with answers my one question.
Cisco IOS Intrusion Prevention System (IPS)
Tuning, Deploying and Updating Cisco IOS IPS Signature Sets For Multiple-Device Deployments
http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6586/ps6634/white_paper_c11_549300.html

IOS IPS and VMS and shunning

Installed 12.3.14T2 (advanced security) on 2811 router with new
VMS update to the IDS Management Center (2.1) to support IOS IPS SDEE event monitoring. When I configure a specific signature, there is no option to shun. Only alert, block or reset. Where do you configure the dynamic shuning or "local shun action" that seems to be in all the "new features" of the IOS IPS.
Configuring the signature to block, alert or reset works fine. Just no options to shun. Also the IPS device does not show up in the device list under Monitoring on VMS, even though it shows up as a device in Monitoring Center Device Page.
Maybe this is where the problem may lie.

IOS versions before 12.3(14)T support the following
actions for IOS IPS:
- alarm
- drop (drop just the offending packet)
- reset (reset tcp connection - works for tcp only)
Version 12.3(14)T and later (including 12.4 versions) added support for the "local shunning" through two different actions:
- denyFlowInline
- denyAttackerInline
DenyFlowInline creates an ACL that drops all traffic on that connection for a certain idle-timeout.
DenyAttackerInline creates an ACL that drops all traffic from that source address (including other connections from that source address) for a certain idle-timeout.

2811 IOS IPS VMS Configuration

I have several already deployed 2811 that I'd like to turn on the IPS feature. IOS firewall is already running. We also have just deployed VMS. Is there any order that need to be followed to get these into VMS. Should I import them into Router MC or IDS MC first? IDS MC documentation isnt clear to me setting up IOS IPS.
thanks in advance

No particular order (that I am aware of).
As far as Security Monitor to monitor IDS Alerts, I choose the hard way and just manually added each of our devices, tedious but all is working.
As far as Performance Monitor, I imported from RME
The bulk of our routers run 12.3(11)T and 12.3(11)T2.
We have a ton of 831's and I choose for them to send alerts via PostOffice rather than waiting for collections via SDEE because the memory in the 831's (48MB) are already just about maxed out (Regularly over 80%) just running the daily needed applications (VPN and CBAC). We have some 1700s and 2600s out in the field too that are not as taxed.
if you choose the PostOffice route (or test it out) then here are the commands and steps you need:
First add the device in Security Monitor to use PostOffice
then from the router console, ssh, etc........
ip ips notify nr-director
ip ips po max-events 100
ip ips po remote hostid [VMS Host ID#] orgid [ORG #] rmtaddress [VMS IP Address] localaddress [Router IP Address] port 45000
ip ips po local hostid [Router Host ID#] orgid [Org ID#]
exit
write mem
reload
Once you reload it will send an initial packet to VMS and the router will register as 'Connected' in Sec Monitor.
You should make sure that the 'ip ips po' commands are accepted in your IOS version
I don't know what your memory consumption is like in your 2800 Router but the config for SDEE Event Collection is much less involved. If your router has resources to spare this is the way to go.

Is there a way to automate IOS IPS signature updates without CSM?

I have a growing number of 891 routers running IOS IDS/IPS. My Cisco vendor has stated repeatedly that CSM is the only way to manage signature updates to multiple routers, but I'm finding CSM to be incredibly tedious and slow. It also wants to manage a lot more than just the IPS policies and signatures which causes other problems.
I have about 160 routers deployed now and that will grow to at least 600. I have CSM 3.3.1. I'm told 4.x would make it easier becasue it can be configured to ignore more of the non-IPS bits of the router configs, but the upgrade is a big chunk of money that wouldn't be in the budget until at least 2012.
Is anybody doing this with an expect script or EEM applets or something else? It seems to me that I could manually upload an update to one router and push the resulting XML files to all the other routers a lot easier and faster than I could "discover" a bunch of routers in CSM (and rediscover them every time we make a CLI change), add the routers to a group, apply updates to a sig policy, lather, rinse, repeat..., not to mention troubleshooting the weird errors and completely wron "warnings" that CSM spews.
Thanks in advance!

From IOS version 15.1(1)T, you can configure the IOS IPS to auto update from cisco.com which would help I believe.
Here is the configuration guide for your reference:
http://www.cisco.com/en/US/docs/ios/sec_data_plane/configuration/guide/sec_ips5_sig_fs_ue_ps10591_TSD_Products_Configuration_Guide_Chapter.html#wp1138659

Which interface to apply IOS IPS

Hello,
I have IOS IPS installed on 4 routers on our network at different sites. They are 2911 routers, with 2GB ram and i am using the latest signatures from cisco. Everything is working fine. I have enabled the basic signatures. At the moment the ips policy is only applied to the wan interface and not the lan. So in summary:
interface serial0/0 (wan link)
ip address x.x.x etc
ip ips mypolicy in
ip ips mypolicy out
exit
According to cisco i should not bother applying ip ips mypolicy out on the wan interface (serial0/0) but should have ip ips mypolicy in on the fa0/0
lan interface aswell as the serial0/0 interface.
interface fa0/0 (lan traffic)
NO IPS POLICY IN HERE AT THE MOMENT
anyone got experience on this?
regards
Kevin

Hi Kevin,
I would say that you have done the right thing, since router are limited in memory we should not enable a lot of signatures and also try to limit the scanning to traffic that we actually need to be scanned.
In what you have done any traffic that in entering or leaving the WAN interface will be scanned.
Now if there are more interfaces on your router and you want the traffic between the interfaces to be scanned as well in that case only you should enable IPS on those interfaces.
Most of the times it is not needed.
Regards,
Sachin

IOS IPS and SDM 2.2.a

Hello everybody!,
I have installed a Cisco 2821 Router with 12.4(4)T IOS version. And SDM V2.2.a. (enteprise service IOS image).
The router have 256MB Ram and 64MB flash memory.
From the SDM Interface cannot upload any .sdf file and cannot edit the signatures and tune de IOS IPS.
Do you know how i can fix that problem?.
Thanks for the answers friends.

Hi,
To add more info, here is the info on defect filed on SDM for RCP issue and workaround suggested.
Symptoms:
Issue 1) Installation of SDM version 2.2a or earlier on a router fails with RCP failure message.
Issue 2) "Load File from PC" feature of File Management dialog in SDM version 2.2a or earlier
fails.
Conditions:
These issues will be encountered for IOS images 12.4(4)T and above.
SDM uses RCP for installation operations. This problem occurs because the fix for CSCdu34824 in
recent Cisco IOS releases has changed RCP behavior. Because of this change, if the RCP client
uses a non-privileged port , the router RCP server does not respond and the above issues occur.
Workaround:
1) For Issue 1 :- Use the copy tftp flash command to copy SDM related files from PC to router.
2) For Issue 2 :- Use the copy tftp flash command to copy the required file from PC to router.

IOS IPS Signature-File

Hi Guys,
We have recently purchased a Cisco ISR 2921, and on its docs it is writen that this product has a License for IOS IPS Signatrue File, but on the product Flash Memory there is no IOS IPS Sig-File.   and while i try to download the sig-file from Cisco, it fails.
Can any one tell me where is an alternate way to download the sig-file ?

900 active signatures is quite much for a system that has no dedicated IPS-ressources.
But you can controll which and how many signatures get enabled on your router:
In the following example I first disable all signatures and enable the ones for web-servers. So just decide which signatures you need. But don't forget to monitor your router-ressources.
gw#conf t
Enter configuration commands, one per line. End with CNTL/Z.
gw(config)#ip ips signature-category
gw(config-ips-category)#?
IPS signature category configuration commands:
category Category keyword
exit      Exit from Category Mode
no        Negate or set default values of a command
gw(config-ips-category)#category ?
adware/spyware                Adware/Spyware (more sub-categories)
all                           All Categories
attack                        Attack (more sub-categories)
configurations                Configurations (more sub-categories)
ddos                          DDoS (more sub-categories)
dos                           DoS (more sub-categories)
email                         Email (more sub-categories)
instant_messaging             Instant Messaging (more sub-categories)
ios_ips                       IOS IPS (more sub-categories)
l2/l3/l4_protocol             L2/L3/L4 Protocol (more sub-categories)
network_services              Network Services (more sub-categories)
os                            OS (more sub-categories)
other_services                Other Services (more sub-categories)
p2p                           P2P (more sub-categories)
reconnaissance                Reconnaissance (more sub-categories)
releases                      Releases (more sub-categories)
specially_licensed_signature Specially Licensed Signature (more sub-categories)
telepresence                  TelePresence (more sub-categories)
uc_protection                 UC Protection (more sub-categories)
viruses/worms/trojans         Viruses/Worms/Trojans (more sub-categories)
web_server                    Web Server (more sub-categories)
gw(config-ips-category)#category all
gw(config-ips-category-action)#retire true
gw(config-ips-category-action)#exit
gw(config-ips-category)#category web_server
gw(config-ips-category-action)#?
Category Options for configuration:
alert-severity   Alarm Severity Rating
enabled          Enable Category Signatures
event-action     Action
exit             Exit from Category Actions Mode
fidelity-rating Signature Fidelity Rating
no               Negate or set default values of a command
retired          Retire Category Signatures
gw(config-ips-category-action)#retired false
gw(config-ips-category-action)#exit
gw(config-ips-category)#exit
Do you want to accept these changes? [confirm]
gw(config)#
gw(config)#exit
gw#sh ip ips configuration | s IPS Signature Status
IPS Signature Status
    Total Active Signatures: 131
    Total Inactive Signatures: 4370
gw#
I didn't follow the thread and answered your first post to have less line-breaks in this post.

IOS IPS SIG Updates via IDSMDC

When using IDSMSC to push out updates for Sensors and IOS IPS devices, the signature update process pushes the updates to the sensors during the udate process. However the IOS IPS devices pulls their signature definitions from the server itself.
So my question is, do you need to "Generate" and "Deploy" to all IOS IPS devices to insure the devices are updated with the latest signature definitions after the update?
SHM

There are a couple of extra steps in producing the IOS IPS signature update. The IOS IPS solution is a subset of the full appliance solution and is further constrained by memory limitations inherent in the routers that it runs in. Because of this, once the signature development team puts together an appliance update, that update has to be reviewed to make sure that the appliance signatures won't crash the IOS implementation. Any issues found during the review have to be addressed before the IOS update can be posted. This extra review step is the cause for the delay.
Regarding the release notes. The signatures usable by the IOS solution are a subset of the appliance update. You can look at the appliance update release notes to see what *might* be available. I say might because of the subset issues....
SC

IOS IPS for blocking IM and P2P

Any recommendations on the best way to use IOS IPS to stop P2P and IM?
I set up a 3845 with 12.3(14)T1 to do this by importing signatures from the latest SDF using SDM. I used the attack-drop, and all IM and P2P signatures I could find. I changed them all to drop and reset. I then applied it to the inside interface of a 3845. I also set up nbar with a drop policy for all P2P traffic.
The configuration caused very slow web response time for users, including blocked pages. Removing the IPS filter made everything work properly again. The router also stopped rebooting periodically.
Is there a recommended way to set this up that does not cause slow performance and reboots?

OK, went back and loaded some upgraded software. Now using 12.4.1 Advanced security IOS on the 3845, and SDM 211. The new 256MB.sdf signature file has all the IM and P2P signatures in it already!
After applying the IPS inbound on the serial interface, I changed the UDP signatures action to drop and the TCP to drop/reset.
Everything appears to be working beautifully. Yahoo and MSN messenger get dropped, as well as the peer to peer requests. I am unable to download Bittorrent. Web access is fast, and there is no hesitation by the router in configuring the IPS.
This appears to be a great solution so far.

IOS IPS Signature Updates

Hi,
Is it possible to update signatures for IOS IPS or do we need to update the IOS to get more signatures?
Thanks and rgds
Rajesh

hi,
if you have cisco sdm, then it would be easy to update your IOS IPS signatures. You may need to upgrade IOS of the router only when the ips signature requires you to do it.

CSM3.1 device addition of IOS IPS router

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