Cisco Application :: 11506 / CSS SSL - No SYN To Server Before Client Initiates Traffic
Jan 24, 2013
I have a web application behind a SSL-offloading CSS 11506 that may require the server to be able to use a SSL connection as soon as it is established. At least I'm troubleshooting a problem that is starting to look like this is a possibility.
The default behavior seems to be to not start the SYN/SYN-ACK sequence with the real server until the client starts talking first (such as send an http get request), even though the SSL termination part is done and ready.
Any way to change this behavior? The scenario is a webapp. Client side starts more than one SSL session to the server, but only uses one immediately. The client knows it has more than one connection and may have told the server so. Like a control plus data channel(s) arrangement. The client opens all the connections (full SSL handshake on all channels), starts using the control channel, and expects the server to start talking on the data channel. However, since the client hasn't sent anything down that TCP connection first... the server doesn't have it.
I don't think this would occur when the server is doing the SSL... as it should have all the TCP connections as soon as the SSL handshakes are done.
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May 9, 2012
I understand that before we can copy the ADI from the FTP server to the CSS, we must create an FTP record file on the CSS identifiying the ADI. But what if I copy the ADI from TFTP server, do I also need to create TFTP record file?
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Mar 15, 2011
I'm looking at replacing a CSS 11506 in a data centre with two Cisco ACE 4710 appliances. One thing that concerns me is the drop in throughput. The 11560 has a maximum throughput of 40Gbps while the ACE we are looking at is only 1Gbps. It seems that the 11506 is able to scale much better?Also, is it possible to run the two 4710s in an active/standby configuration?
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Oct 30, 2011
I am trying to get a sample command output of "show chassis inventory" for:
CSS 11501
CSS 11503
CSS 11506
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Aug 7, 2012
I have a Cisco ACE 4710 A5(1.2). Scenario: Inbound call from PSTN to SIP Phone. Call comes into the VIP and then load balances to sip server, the server then routes the call out via WAN to the SIP phone as below:
PSTN SIP Providor >(router)> ACE4710 > sip_server(s) > ACE4710 > (router) >SIP Phone
Note: Router is Cisco 3925 with "ip nat service sip udp port 5060" and Port 5060 mapped to the VIP of the ACE.If I put the sip server directly behind the router it works fine. From behind the ACE:
If I turn on sip inspect on the VIP the call setup (INVITE) and termination (BYE) work fine but the audio loops on the PSTN side from the mic to the speaker.If I turn OFF sip inspect then the audio is fine and mapped correctly but the call terminaton (SIP BYE) hits the VIP from the PSTN but never reaches the sip server.For ease and dianostics, I have turned off all sip servers except one meaning the load-balancer has only one server to choose from.SIP Call_id sticky is setup and seems to work, though irrelevent with one server only on test.How do I get the ACE to accept 'server initiated traffic' with sip inspect so it knows about the pending BYE when it comes back from the IP phone via the VIP?Config below, image attached. Bridged mode (also get the same result in routed mode)
access-list everyone line 8 extended permit ip any anyaccess-list everyone line 16 extended permit icmp any any
probe sip udp 1 description SIP Health Monitor interval 30 expect status 200 200
rserver host server1 description Production SIP Server ip address 10.44.56.172 conn-limit max 980 min 980 probe 1 inservice
serverfarm host sip failaction purge probe 1 rserver server1 inservice
[code].....
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Oct 15, 2011
I want to use one arm infrastructure of ACE4710. But I remember it was problem for back end server can not get logging for which client/ip address access the web server.
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Sep 10, 2012
A company I work for has a number of CSM modules (WS-X6066-SLB-APC) installed in 6513 chasis switches. The CSM modules are running version 4.2(14)These CSM modules are configured to load-balance a number of vservers via serverfarms, each serverfarm containing multiple real servers.
Here is some example configuration:
vserver SITE
virtual 10.1.2.3 tcp www
serverfarm SERVERFARM
persistent rebalance
inservice
[code]....
The company is facing a problem with what seems to be related to return code checking. Every once in a while a server will suddenly not receive any traffic for 5 minutes. This always occurs right after the server has sent a HTTP 503 return code. However we cannot see in the CSM logs that the CSM module has actually disabled the real server. For other serverfarms which are running regular HTTP and/or ICMP health checks to real servers we can clearly see in the CSM logs when a real server has been temporarily disabled due to health check failures.
The return code checking is set to disable a real server for 300 seconds after the CSM has received five HTTP 503 responses from the real server. If we check the real server log however we cannot find more than that single 503 return code right before the server stops seeing any incoming traffic unless we move back at least hours in time.I have tried to figure out what time frame those 5 return codes must be received within for them to count towards the maximum allowed return codes, but nowhere in no documentation can I find any information about this time frame.For all I know the CSM could keep track of every incoming 503 forever, until the maximum of five 503's is reached, and then the server is disabled for 300 seconds.
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Jul 23, 2012
I put multiple rservers in multiple server farms?
So for example rserver1 and rserver2 are put in serverfarm production1 and are in use with particular sticky and load balancing settings.
Can I then create serverfarm test_production and put both rserver1 and rserver2 in it? Then play around with the sticky and load balancing settings as a test without affecting the production serverfarm.
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Feb 16, 2012
I'm trying to design a CSS configuration that allows servers in the same vlan to be the source and destination of load-balanced traffic. My thought is to add two new vlans, one for the VIPs and one for the servers, then NAT the source IPs going from the LB to the servers.
Is this the right way to do it?I've never NATted using CSSs, so I wanted to verify what I'm thinking.Our current config trunks the vlans -
interface 1/1
trunk
vlan 1
default-vlan
vlan 555
[code]....
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Mar 31, 2012
I have two wi-fi network, and i have written client server model in c (Linux), client has three threads and each thread having different physical wi-fi conection to server. But the problem is that, overall data rate is not increased by this, it is similar to using with one wi-fi connection.
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Jan 4, 2012
client is unable to establish a connection to the backend servers via the vip on port 389 ,636 configured that servers are listening on these ports .even the probe is successful on port 389 but not getting any response back from the servers. [code]
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Sep 29, 2011
i am facing the same problem now but am using windows 2003 server
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Mar 12, 2012
I’m wondering if there is a way to configure CSS11503 running 8.10 so that the servers in the content rules can see the client port number?The servers can see the client IP, but not the port!! It seems when forwarding packets to the servers in the content rule, the CSS uses a new high-number port when communicating with servers.
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Apr 15, 2012
Whatever a NAT is supported for ACE-20 module? I do need to convert working CSM(SLB) config to ACE configuration and I am not quite sure if the configuration below is correct. ACE module should be configured in bridge mode with two vlans - vlan 36 (client) and vlan 436 (server) - bridged with interface bvi 36. NAT on ACE configurad as "nat dynamic 1025 vlan 436" into corresponding "policy-map type loadbalance". Check two parts of configs and if the ACE config is properly converted from CSM and will be working in the same way (especialy for NAT). [code]
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Jun 27, 2012
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.
Code...
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Mar 23, 2012
I am using an ACE 30 module for loadbalancing to two proxy servers. Not all the traffic needs to be loadbalanced and directed to the proxy servers. I would like the clients trying to access our intranet and other internal resources to be redirected to them before they are loadbalanced and sent to the proxy servers . Can this be done with the ACE?
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Nov 25, 2009
I have an environment with SSL termination and client authentication with a client certificate. Now, the backend server application needs to be informed of the client DN information present in the presented client certificate. Is it possible to tell the ACE to send specific client certificate fields to the backen server via insertion of an HTTP header or, to forward the entire client certificate in any way to the backend server ?
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Nov 12, 2012
I have a ACE4710 setup to load balance a couple of web servers. The real servers all show as inservice as do the propbes and serverfarms/virtual servers. If I ping the Virtuual server ip address I get a reply but it I try to access VIP via telnet or web browser. I get a connection could not be open error on the client.The question is how do i determine where the error is comming from so far I can not tell if the client is getting through the acl or not.I have used the trouble shooting guide and nothing has worked to determine the cause so far. show service-policy int479 detail does not show an increase in the hit count when I try to connect.show stats conn does not show an increase in failed or timed out connections when i try to connect. [code]
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Jan 12, 2011
configuration example on how to reconstruct the original client IP address from X-forwarded-for in HTTP request?
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Apr 5, 2011
I hava Cisco ASA 5520 with AIP-SSM module. I would like to have the below features with ASA installed in Transparent mode.
1. Traffic shapping per user
2. Traffic shapping per IP subnet
3. Traffic shapping per Application
Is it possible with ASA installed in Transparent mode?
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Mar 5, 2013
I have an HTTPS probe that sometime fail, sometimes does not fail.
[code]....
The probe that sometimes fails is the TEST-HTTPS. The TCP_443 probe works perfectly well.The ACE is configured in bridge mode.Is it possible to capture the PROBE traffic on the ACE side?
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Feb 10, 2011
I have been trying to conect a Cisco VPN client through an ASA and it makes the connection but doesn't allow any traffic through. The ASA does have a site to site VPN attached to the outside interface.I suppose the first question is it possible to allow VPN client to connect through an ASA 5500 from the inside network when there are Site to Site VPN's already attached to the outside interfaces?If possible then what have I missed. I have tried adding NAT exempt for the traffic between the internal networks and "an IPSEC pass thru Inspect Map".
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Sep 20, 2012
I have a few ASAs with L2Ls in a hub-and-spoke fashion, works great. All ASAs are 8.2(1). I've tried to add remote-vpn to the HQ ASA. I have this working on a PIX 6.3 box at HQ, but have not been able to make it work completely on the ASA.
Just to check, I also set up remote client vpn access on one of the spoke ASAs, and that actually did go well. Applying the equivalent config on the HQ ASA - won't function.
The problem with the HQ ASA remote client vpn is that after completed phase 1 & 2, the traffic goes one way only, from client side towards the ASA. I e remote side only encaps, no decaps; ASA side only decaps, no encaps. If the remote client pings a host on the inside (i e behind the HQ ASA) the packets arrive, and are returned towards the ASA (a correct route for the remote vpn network is in place on the inside host). However, it seems as if the ASA doesn't send that traffic back into the tunnel, but rather sends it unencrypted through the default route (doing a traceroute from the inside host for instance suggests this).
The ONLY way I can pass traffic towards the remote client is by initiating a ping from within the HQ ASA, it's the only time I get encaps on the ASA side and decaps on the remote side of the tunnel. Interestingly, it's actually the "ping outside 192.168..." that works, doing an "inside" ping fails. Compare this to the spoke ASA and its remote vpn client, there an inside ping is succesful, but not a outside ping, i e the spoke ASA functions as expected with its remote vpn. Given that the configs on the two ASAs are the same for remote client access, I would have expected both to work, not only one of them. But then, the HQ ASA has more lines of code, and I guess that something there gets in the way. [code]
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Feb 10, 2012
i already created a vpn server on my 878 router.. so that i can connect with ip-sec (cisco vpn client) to this router and network..
all working great... however... when i also want to allow multicast traffic over my vpn connection. do i then need a GRE vpn? or what?or is this only needed when you use a site to site vpn..?And how can i enable this?
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Oct 9, 2012
I want to be able to use port 1-80 for all outgoing traffic. I have a VPS outside my home, which can redirect the packets to the prober ports.Is it possible with an application on the computer and VPS? Or is it impossible?
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Aug 26, 2012
I trying configure ASN traffic load balance, but doesn't works.I have one Cisco Catalyst 6509 and onde Cisco Ace10 module, in my context "PanWEB" i have the interfaces above: [code] If i try to establish a telnet session(telnet 10.96.202.10 80) i see the SYN packet passing through the ACE and going to the real server, but, the server do not response the SYN packet. I done a capture in the server using wireshark and could see that the IP address of the destination is the VIP and not the rserver ip address , this is a problem? Why can not I have the SYN + ACK from the server?
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Jul 12, 2011
Can the ACE appliance behave as a reverse proxy for http and ssl traffic? I would assume it can given how it does SLB but SLB is not a requirement at this time.
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Jul 30, 2012
I have a requirement to bypass some specific traffic (with particular source to specific internet destination) in ACE 4710.
All the webtraffic (http and https) is configured to loadbalance to my proxies , i need to configure some specific traffic with source and destiantion to internet to byepass from this loadbalancing and directly got to outside interface .
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Oct 12, 2012
How can we check when we connect using VPN client software if traffic is getting encrypted ?
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Jan 1, 2013
I'm looking for a way to configure Cisco ACE4710 loadbalancer to bypass traffic that is initiated from server side to Internet?Are there any way to configure this, so that the loadbalancer will not maintain session for this bypass traffic to maximize throughput?
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Mar 16, 2013
I have ASA 5510 8.4 Firewall where more than 20 Site to Site VPN Clients are configured on it. how to see the traffic for one Specific Site to Site VPN.Actually this site to site vpn is always keep dropping for every minute. I'm sure its a problem at the other end.The remaining 19 VPNS are UP and working without any problem. How to see the traffic for specific vlan.More over we dont have any syslog server in our network. Is their any chance we can check the traffic on the firewall?
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Nov 28, 2012
I have a client with a WLC 2504 that wants to route "guest" users through a gateway appliance "radiusgateway.com" and all others through the network. It appears to me this would require the use of two fa ports on the WLC. One directly connected to the radiusgateway (which is connected to a switchport) and the other fa interface connected directly to a switchport bypassing the proxy server.
My issue is, "how do you segment the ssid traffic via the WLC". The interfaces cia the gui aren't that intelligent, there's an enable and logging drop down. Via the command line, I didn't see any methods of routing traffic.
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Jul 31, 2012
I have an ASa 5510 and setup remote dial in users.
I wanted to use the windows 7 built in client and also the draytek site to site VPN options however when they connect VPN traffic will not work however when i use the cisco VPN client then everything works fine.
All the VPN's connect pretty quickly.In the syslog I a getting errors when i try and ping something: [code]
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