Cisco Application :: Weak Cipher Blocking In ACE20?
Jan 27, 2012
I tried to create a L7 class-map for blocking the clients with ciphes strength less than 128 in ACE20 running with Software version A2(2.3).But there were no command inside the L7 class-map called cipher for matching the cipher strength 128. Command Tried to issue was host1/Admin(config-cmap-http-lb)#match cipher less-than 128 So I want to know whether this is possible on ACE 20 and SW version A2(2.3). Kindly suggest a way to acheive this.
I have seen some other configuration using the parameter-match, But I dont know the Cipher Names which to allow. I want to drop all the connections with less than 128 bits cipher strength.
I want to route gre traffic through an ACE20, but it doesn't seem to work. The only thing I configured was an ACL with gre enabled, but the ACE20 seems to drop the gre packtes. The gre traffic is entering via the vlan 561 interface and should be send out via the vlan 472 interface. Source 10.94.32.212, destination 10.94.132.39. The tunnel control traffic on port tcp/1723 is working fine. In the service-policies is nothing configured for the gre traffic.
We are using an ACE engine module(ACE20-MOD-K9) provide loading balancing service for two WEB servers and configured cookie for stickness. Below is the current configuration and it seems working fine now.
The problem I was facing is before use parameter-map change the http header length to 8k the stickness doesn't really working properly. User complains that their working session constantly be kicked out and redirect them to login page. By tracing traffic from a client we found that sometime ACE fails or stop insert the configured cookie, after increase the header length ACE start getting work.
how does the header length setup effect ACE to insert a cookie? Will the cookie insert attmpt fail if the header is longer then the maximum length configured on ACE? [code]
To start with following is our architectural request flow:
Load Balancer --> Webseal /(reverse proxy) --> HTTP Server --> Portal Server
We have Hardware Load Balancer Cisco ACE20. When we access our portal from Webseal server it works totally fine without any issue, but when we access the same application using ACE we face the following issues:
1) Some of the links on do not work. For eg: We have a link "subscribe" which points to [URL], whenever we click on this link, the request is directed to [URL] i.e homepage
2) URL redirection does not work We have some links which have a url forwarding or redirection for example when we open [URL] it forwards the requests to [URL] opendocument....., but this redirection fails and again the request is thrown to homepage i.e., [URL]
3) The response of the request and the overall portal when accessed via ACE is very sluggish and it takes 20 seconds for homepage to load, whereas the homepage loads in 4 secs when accessed via webseal.
I would like to add a vlan to a second context on a pair of redundant ACE modules. As soon as I open up that shared vlan box we will expose ourselves to mac conflicts until the shared-vlan-hostid commands can be implemented and the module reloaded. Adding the commands is not a big deal but I may not be able to schedule a reload until next week. What I would like to do is confirm the mac pools in use by each module right now. My hope is that they grabbed unique pools when they last booted and a conflict will not be a concern now.
I have an ACE20-MOD-K9 with version A2_3_6a, and i am having problems in cookie persistency. the setup contains 4 servers using round-robin algorithm and cookie persistency and that receive http traffic on port 9090. I have been receiving complains that the users are getting disconnected randomly while accessing the web application through ACE. Below is part of the config, when setting the timeout of the cookie to default or something equal to hours, the disconnection/complains gets worse.
We have a pair of ACE20-MOD-K9 in Fault Tolerant mode. They are running multiple contexts and we have a problem with one particular context which is running SSL off-loading. Despite the config being identical on both (accept for the peer addresses obviously) and both having the same SSL Key and Cert files loaded on both, the configuration will not sync between them. [code] All the Crypto files are identical as I copied them from one ACE to the other.
We are currently running a ACE20 with 11 contexts. Recently we have seen that one of the contexts is being 'starved' of resources, especially Concurrent Connections, Bandwidth and Throughput.
Whilst we know how to address this situation by reallocating resources from less busy contexts, I was wondering if there was a more scientific way of looking at the resources being used and calculating the best way to allocate them across the ACE other than just looking at the 'show resource usage' and 'show resource allocated' commands?
Has Cisco or any other 3rd party developed a handy tool to monitor the the ACE resources which will possibly assist with calculating the optimum resource allocations across all contexts?
We are using an ACE20 module running version A2(3.2).I have a question regarding IP stickyness and the timeout parameter.I found this in the "Server load balancing configuration guide" (in a section entitled: "Configuring a Timeout for IP Address Stickiness"):
"The sticky timeout specifies the period of time that the ACE keeps (if possible) the IP address sticky information for a client connection in the sticky table after the latest client connection terminates. The ACE resets the sticky timer for a specific sticky-table entry each time that the module opens a new connection or receives a new HTTP GET on an existing connection that matches that entry."
The parts in bold seem to point to the fact that the timeout is an "inactivity timeout" as the counter is reset on every new connection.The next section in the documentation is entitled: "Enabling an IP Address Sticky Timeout to Override Active Connections" and says:
"By default, the ACE ages out a sticky table entry when the timeout for that entry expires and no active connections matching that entry exist. To specify that the ACE time out IP address sticky table entries even if active connections exist after the sticky timer expires, use the timeout activeconns command."
This seems to contradict the previous statement.So my question is: is the IP stickyness timeout an "inactivity timeout" or not?
I've run into an interesting problem trying to migrate my production config from my redundant ACE20's (A2(3.4)) to the new ACE30's (Tried (A4(1.0) and A5(1.0)). Everything on the ACE30 is working fine with a base config, but when the restore all is run from the ACE20 backup (backup all), the SSL files are not restored and return errors. All the contexts are restored correctly, along with the startup-config, but the running config fails due to no SSL.
All the crypto certs/keys are exportable and are present in the backup .tgz file.
I have a physical server running behind the ACE module ACE20-MOD-K9. The Server has several virtual machines. One of that virtual machines, has a WEB SERVER running virtual https servers. For example, server with IP address 10.0.0.20/24, has serveral virtual HTTPs servers as of urll... So, if you nslookup the servers, they all respond with 10.0.0.20 IP address. So if I do url...goes to 10.0.0.20 and read the VIRTUAL SERVER config and replies back to the request.Now, I am trying to verify that the TCP connection (443) and the HTTPS server itself is up and running but only for the url... site and not for the other 2.The problem that I am facing is tha the HTTPS probe fails randomly. The TCP probe works fine.
During high throughput times (nightly, when backup runs) we see packet drops on the network. We think it's the ACE module that drops. We use 2 ACE 20-MOD-K9 with base licenses in a FT configuration in Layer2 Mode.Now I found an interesting statistic on the ACE: [code] How to reset this counter?
I just installed a TP-Link router. Everything (almost) works: PC internet, laptops internet, email, etc. An application on my PC can't communicate through the router to the internet server now. I am sure it is a port/IP address issue. But I am unable to figure out a solution. I have already changed the IP (of the computer with Windows 7) to a static IP address. I guess now I need to get the port access done. I know the ports in question from calling the vendor. I just need to get the application through the router.
I'm trying to build different content security scenarios for a potential deployment of ASA5500-X series firewall with CX module and ran into a trivial problem. A simple access policy has been configured to deny Skype. It's as simple as it sounds. To my surprise I don't see that it is being enforced.I have all my pending changes committed, events are now showing with hits, see attached print screens. Tried to start Skype on my PC with the source shown on the print screen it and don't see any effects of this policy.
As a side note, I know for sure that other type of filtering does work, i.e. I have configured a deny filter for gambling URL category and it seems to work nicely.
Recently we have added cisco 6513 switch in ciscoworks which is having ACE30-mod-k9 module in it. now for any events syslog messages are logged in syslog.log file of my ciscoworks server but not reflecting in my ciscoworks portal. i can see the syslog alearts in syslog.log file.also email notifications i m not getting for the same though email credentials are mentioned in SYSLOG automated actions in RME.
I have bought and installed a 2048bit certificate from Thawte on a ACE20-MOD-K9 module. The appliance can't use it and gives the following error: "This certificate cannot be verified up to a trusted certfication authority."I have contacted Thawte about this and they suggest to install an intermediate certificate from Thawte on the module, but I can't find such a certicicate for Cisco on their site. Also I'm not sure how to go about implementing such an intermediate certificate on the ACE.
I currently have a WAP4410N connected to an ethernet switch and the signal is very weak when attempting to connect to the AP from 4 rooms away. The structure is all block and the signal does not do well between the solid walls. I would like to roam from room to room on the same SSID. how to have the second WAP4410N repeat the original signal and reaplify it from the first WAP to solve this issue. Also, I cannot connect the second WAP to the ethernet switch it must be wireless.
I am currently having a problem connecting to the internet on my desktop connection. It is a wired connection from the modem straight to my desktop's ethernet port.It has been fine for a long time until today where it is suddenly unable to connect to anything internet-related at all or takes a long time to load even half of the page.My desktop is running on windows 7 and I was using avast antivirus until i tried uninstalling it in an attempt to fix the issue but to no avail.I am able to use the cmd and ping to other websites but the problem is, all of them have a latency ranging from 500-1000ms, even websites that are local to me.I have tested the connection on my laptop and it seems to work properly without all the problem stated. [code]