CSS Load Balancing Citrix Terminal server, is ti possible ?

Hi we have to balance a Terminal Server Citrix Server Farm with css, did anyone already realize it? Is there any problem to do it ? Someone told me there is nat problem with citrix metaframe terminal server, has anyone information about it ?
Any help will be greatly appreciated. Many thanks
Max

Stickyness means that once a user is directed to a server through the load balancer, that user will remain on the server he was first load balanced to for the duration of their connection. Otherwise, every tcp connection that a user makes is load balanced to whatever servers are configured. There are severalways to configure stickyness. You can do it via:
-source IP
-source IP and destination port
-text string in a cookie or URL
-SSL session ID
take a look at this document that explains it better than I could:
http://www.cisco.com/en/US/products/hw/contnetw/ps792/products_configuration_guide_chapter09186a0080772d96.html

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CSS Load Balancing with Billing Server

Hi Gilles
Could I have a CSS load balancing two servers and also have it communicate with a billing server across the network. If yes then how can I do it?
Regards,
Sushil

the CSS does not have the notion of billing server. A separate device - like the CSG - should be used if you need to collect billing info.
Gilles.

CSS Load balancing for Exchange Server

Hi,
I have CSS configured in single arm and I have multiple servers configured for load balancing and it is working fine but when I am configuring Exchange server for load balancing I am facing problem and applications and printer/scanners are not able to send the email through the Virtual IP address configured for exchaneg server.
But if we configured the real server IP in the printer/scanners they are able to send the email. While checking the logs on the exchange server, it is showing that request for the email so coming from the Exchange VIP configured in the CSS.
I can telnet on port 25 on the VIP address (192.168.200.237). But unable to send the email through this VIP.
Below is the configuration
service ENOC_EXCHANGE-1
ip address 192.168.200.235
active
service ENOC_EXCHANGE-2
ip address 192.168.200.236
active
content EXCHANGE
    add service ENOC_EXCHANGE-2
    add service ENOC_EXCHANGE-1
    vip address 192.168.200.237
    active
group EXCHANGE
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add destination service ENOC_EXCHANGE-2
vip address 192.168.200.237
active
DC-CSS01# show rule GIT EXCHANGE
Name:                EXCHANGE   Owner:                ENOC_GIT
State:                 Active   Type:                     HTTP
Balance:          Round Robin   Failover:                  N/A
Persistence:          Enabled   Param-Bypass:         Disabled
Session Redundancy: Disabled
IP Redundancy:    Not Redundant
L3:         192.168.200.237
L4:         Any/Any
Url:
Redirect: ""
TCP RST client if service unreachable: Disabled
Rule Services & Weights:
1: EXCHANGE-1-Alive, S-1
2: EXCHANGE-2-Down, S-1
=============================================================================
Please let me know how to solve this problem. System team is saying with the physical IP address it is working fine problem with Load balancing. I have even tried with the
Add service command in the group but didnt work for me. If i will remove the group command then I cant telnet on port 25.
I think this is related to single arm modle or some wrong configuration for the NAT.
Kindly assist me

Hi
Printers are on Vlan 80 ( gw is 192.168.80.1) and exange server is on vlan 200 (gw is 192.168.200.1) i have multiple vlan which will communcate with exchange.
I hv other servers on 200 subnet which are working fine in load balancing.
My CSS is single arm setup.
Please assist
Sent from Cisco Technical Support iPhone App

Problem with WLIOTimeoutSecs in weblogic and apche CSS load balancer

Hi,
We are using Weblogic 11g, apache 2.2 and CSS load balancer for load balancing.
we have huge reports which take minutes to generate and hence we need higher value for WLIOTimeoutSecs. This works fine when we use server url but WLIOTimeoutSecs is not working when we use CSS load balancer.
We checked with our load balancing team they said CSS load balancer will not repost the request.
Here is the plugin configuration
<Location /*****>
SetHandler weblogic-handler
PathTrim /
WebLogicHost 'serevrip'
WebLogicPort 'port'
WLIOTimeoutSecs 3600
Idempotent OFF
WLProxySSL ON
DefaultFileName /***/***/index.jsp
Debug On
WLLogFile /***/***/***/***.log
</Location>
Could some please help me on this.
Thanks in advance
Regards,
Venkat

Hi Tarun,
The problem occurs when the SSL is enabled on apache. If I access the same URL over HTTP, the parameter WLIOTimeOut works fine.
Also I observed that, none of the parameters are getting applied to the plugin. I had switched on 'DebugConfigInfo'. With this the HTTP URL with ?__WebLogicBridgeConfig as query parameter returned the complete configuration. However when accessed with HTTPS the server did not return the configuration.
Is there a specific configuration to be applied when apache is used with SSL?
Thanks for your help,
Shashi

Load balancing 2 DNS server

how to configure the CSS to load balance 2 DNS server ?

first configure the services like this :
service dns1
ip address x.x.x.x
active
service dns2
ip address x.x.x.x
active
Then configure the content rule
owner mycompany
content dns
vip address x.x.x.x
add service dns1
add service dns2
active
Then we need to setup something for the dns answer
group dns
vip address x.x.x.x !!!!! same as for the content rule
add service dns1
add service dns2
portmap disable
The portmap disable requires software 5.03(33) or above.
The command is also in 5.01
http://www.cisco.com/en/US/products/hw/contnetw/ps789/prod_release_note09186a00800ba0c6.html

Load balancing on RMI Server Application

Hi there, I'd like to know more detail about load balancing on RMI server application, been digging the web for some time, but couldn't find much information, does anyone know any website or has the knowledge of load balancing on RMI to share? Sort like its design and implementation.
Thanks,
Jax

I want performance and fault-tolerance,
In that case, is it necessary to have a main
rmi server to allow client to access and pick one of
the rmi servers for the client?Well, if you have one main RMI server, you have a single point of failure again.. Why can't your application know about all rmi servers, and randomly choose one? If it's down, pick a different one.. If your applicatoin is an applet, you'll have to sign it.. Do that and put it on 2 redundant web servers. You have performance by splitting the load and you have your fault tolerance by having x identical rmi servers.
If you're saying what I think, why would you have one main rmi server that picks a different rmi server? That's more work AND your redundancy goes byebye, ie if your main rmi server dies..

ACE to load balance Citrix servers

Hello,
Have anyone configured ACE Modules to load balance Citrix Servers (HTTP) ?
Any special considerations needed?
Many thanks,

HI Javier,
There is one complete design guide available on ciso site.
Kindly go through the below mentioned URL for complete config for ACE to load balance CITRIX as follows:
http://www.cisco.com/en/US/docs/solutions/Enterprise/Data_Center/App_Networking/citrixdg_final.html
You will get othe design guides also which can be very useful:
http://www.cisco.com/en/US/netsol/ns751/networking_solutions_design_guidances_list.html
Sachin Garg

How to set up load balancing with overload server on css

can anyone tell me how to set up a load balancing config on css that will enable me to LB proxy caches and when they have too many connections then LB against an overload proxy-cache.
Such that when the normal proxy-cache farm is under the ceiling of max connections then the overload server is not used ?
I don't think redirect or sorry server will do this ?

see the below configuration,any question,just tell me.
service proxy-1
! below is the real ip of server
ip address 10.1.1.1
keepalive type icmp
active
service proxy-2
ip address 10.1.1.2
keepalive type icmp
active
! enter owner config-mode
owner proxy
! define a content rule,match what you want to load balancing
content rule-proxy
! below is virtual ip,it can be another ip segment
vip address 10.1.1.50
add service proxy-1
add service proxy-2
protocol any
advanced-balance sticky-srcip
active

Load Balancing with forms server 10g

Hello,
i've a cliente which is right now processing a migration from a client-server 6i platform (using Terminal Servers) to a forms 10g web platform with several Application Servers 10g in standalone.
At the end, client want to enable Load Balancing in order to have some manage at each Application Server load.
The idea to accomplish is to have an hardware Load Balancer. The client already has a CISCO CSS 11503 SSL.
Is there any documentation where i can check more info about the compatibility/configuration to this architecture.
Thanks for your attention.
regards,
Pedro Ribeiro

You can check this doc Link:[http://download.oracle.com/docs/cd/B14099_19/hpux.1012/install.1012/install/toc.htm]
It say all about it, and don't mention nothing about a Load Balancer, but I'll try tokeep searching.
Greetings.

CSS Load Balancing with Cookies

We are trying to load balance 2 backend servers hosted on Websphere with advance balance cookies method.
Restrictions
ServerA is unable to accept cookies generated from ServerB.
ServerA and ServerB are generating random cookies
Unable to modify cookie string with a constant.
How can we load balance based on cookies considering the above restrictions?
We have attempted to do hash based load balancing with cookies but the problem we run into is the servers do not accept cookies generated from another server.
The configuration we tried is written below:
service ServerA
ip address 192.168.10.2
keepalive type tcp
keepalive port 80
active
service ServerB
ip address 192.168.20.2
keepalive type tcp
keepalive port 80
active
content ABC
url "/*"
add service ServerA
string prefix "JSESSIONID="
advanced-balance cookies
port 80
add service ServerB
string skip-length 5
string process-length 16
string operation hash-xor
protocol tcp
vip address 172.16.32.1
active
Can we change the string prefix to JSESSION instead of JSESSIONID= ?
The only place the app guys can add a constant string to match on is before the = sign.
Is it possible for CSS to match on a constant string before = sign e.g below:
service ServerA
ip address 192.168.10.2
keepalive type tcp
keepalive port 80
string id567=
active
service ServerB
ip address 192.168.20.2
keepalive type tcp
keepalive port 80
string id123=
active
content ABC
url "/*"
add service ServerA
string prefix "JSESSION"
advanced-balance cookies
port 80
add service ServerB
string skip-length 0
string process-length 6
protocol tcp
vip address 172.16.32.1
active

It should work.
There is no reason for it not to work...
This is the best method you can have on the CSS for stickyness.
Get a sniffer trace on the client and server with arrowpoint cookie configured on the CSS and capture a failure so we can see what is going on.
also send me the config so I can verify everything is ok.
If you have a service request open with the TAC, you can also give the SR # so I can review what has been done.
Gilles.

CSS load balancing issue

Hi,
I'm facing a problem with CSS while load balaning for the web application with two servers.
The application is based on activex..
Basically I have two servers running web application for which I have created VIP in the CSS, user hits the VIP address and they access the application, also we use the sticky thing as the application requires the session persistence.. everything is fine, but the problem starts when one of the server fails...
Assume a user hits the VIP address and access the application, due to the sticky thing his session will be with server A (for eg.), now suddenly the server A fails and in that time the user was doing a transcation and inputting some data and after that he press the submit button on the page, as the server A is down the web page gets refreshed and he has to relogin to the application and redo the whole thing what he was doing in that particular transcation...
Now the application guys are telling this problem should not happen as the CSS should be able to take care of the session getting reestablished to the other server B during the server A failure...
Can someone through some lights on this... I'm bit confused now... as what I understand is that the webpage gets refreshed during a server failure because the tcp session id will get changed and the server B will not accept the same tcp session so it reinitiates the new session...
Is my understanding right?? or is there something which we can do on the CSS to avoid this problem...
Regards
Vijay.

Hi Gilles,
Thanks for the clarification.
I have two more issues too...
1. The load balancing of the application between the two servers are not even. Actually the traffic from the users keep hitting only one server, I understand the point of sticky method used in our case, but even atleast the connection from another client machine should go to the other server,but it is not the case... traffic from all the clients goes to only one server..
what could be the possible reason for the same...
My config is as below...
service SERVER-1
port 80
protocol tcp
keepalive port 80
keepalive type tcp
redundant-index 4
ip address 10.6.223.87
active
service SERVER-2
port 80
protocol tcp
keepalive port 80
keepalive type tcp
ip address 10.6.223.77
redundant-index 5
active
owner WEB
content WEB
add service SERVER-1
add service SERVER-2
redundant-index 104
vip address 10.6.223.78
protocol tcp
port 80
url "/webretrieve*"
advanced-balance sticky-srcip
active
2. Slow response of the application when users access application through VIP address(CSS), what can be done further in the configuration to improve the performance?? or any thing else I can do...
Regards

CSS load balancing problem

Hi,
I have two CSS that I use to load balance RDP connections to two WTS servers. I dont have switch behind CSS so they are connected back-to-back via cable. All server facing ports (including back-to-back ports) are in the same VLAN.
CSS1 is primary for the VIP address and for redundant interface address, and CSS2 is standby.
So, when I connect WTS-1 to CSS-1 and WTS-2 to CSS-2, CSS1 sees both services as active and everything seems fine. If WTS-2 is disconnected, WTS2 service on CSS1 is down etc.
In sticky table, I can see that CSS1 is load balancing request to both servers, but the problem is that only RDP connections to WTS-1(server directly connected to CSS1) work fine , and connections that are load balanced to WTS-2 are dropped??? Direct RDP connection to WTS-2 IP works fine.
If I connect WTS-2 to CSS1, so both WTS servers are connected to CSS1 everything works fine.
Can anyone tell what can be wrong?
Configurations are in the attachment.
Thanks for help.
Regards,
Branimir

try the command 'ip uncond' on both CSS.
It will guarantees that the response from WTS-2 comes back to CSS1.
Gilles.

CSS - Load balancing to Microsoft 2008 Sharepoint Application

We are tring to load balance using the CSS 11503 to two Servers running Microsoft Sharepoint 2008. Everything is working fine as far as load balancing is cocerned. But what we want is if the Microsoft Sharepoint 2008 Application is down one one server then we do not want any request for this application to be sent to this server. What sort of keepalive should we be using, because TCP port 80 is still up and responds when the Microsoft Sharepoint 2008 Application is down on this server.
I do not know much about how Microsoft Sharepoint 2008 Application interfaces / interacts with IIS and port 80, etc.
Any suggestions?

Partial Config:
===============
service FRED30
ip address x.x.x..100
protocol tcp
port 80
redundant-index 3
keepalive port 80
keepalive type http
active
service FRED31
ip address x.x.x.101
protocol tcp
port 80
redundant-index 4
keepalive port 80
keepalive type http
active
When we do the above where we have
"keepalive type http"
and then do a show keepalive we get the State as DOWN - why? But if we take out the keepalive type http command from the above services then we don't see the state as DOWN.
But even when it says DOWN we can still connect to port 80 without problem.
CSS# sh keepalive AUTO_FRED30
Name: AUTO_FRED30 Index: 7 State: Down
Description: Auto generated for service for FRED30
Address: x.x.x.100 Port: 80
Type: HTTP:HEAD:/
Keepalive Error: General failure
Frequency: 5
Max Failures: 3
Retry Frequency: 5
Dependent Services:
FRED30
sh keepalive FRED31
Name: AUTO_FRED31 Index: 9 State: Down
Description: Auto generated for service FRED31
Addresess: x.x.x.101 Port: 80
Type: HTTP:HEAD:/
Keepalive Error: General failure
Frequency: 5
Max Failures: 3
Retry Frequency: 5
Dependent Services:
FRED31

CSS load balancing questions

I hope that someone can help with 2 simple (i think) CSS questions.
1. When configured properly for load balancing, should the CSS round-robin between servers or will it continue to use only one server until triggered by some event or parameter?
2. If 1 of 2 load balanced servers fails, how does load balancing proceed? Will it continue to try to load balance between the servers or will it give up on the failed server unitil some event or timeout occurs?
Thanks in advance,
Eliot

Hi Eliot,
The CSS can be configured to perform load balancing in a variety of different ways. Least connections, round robin, ACA etc. Each new connection through the CSS will be round robined over each of the servers in your server group.
If a server fails then the CSS will know it has failed through the use of keepalives (based on TCP connection, ICMP etc) and no longer send requests through to that server. Traffic associated with a previous connection to the failed server will be sent to on of the surviving servers. It is then up to the behavior of the application as to if the user experiences any disruption.
Hope this helps
Brett

Load Balancing Microsoft RDS server

Hi there, we have two servers hosting remote desktop service roles, is there any way to setup load balancing on these two?
Say setup a pointer "xxx.rdsfarm.com"? The pointer points to two servers with round robin? We have third party LB doing load-balance work for Citrix Xenapp.
Thanks
Regards
Ying Liu
Ying Liu MCSE, CCNAV

Hi Ying,
Thank you for your posting in Windows Server Forum.
Can you please let me know the OS Version of RDS Server?
Yeah, you can load balance the two RDS Server and can combine with RDCB server for setting up RDS load balancing environment. Please check below article for information.
1. Remote Desktop Server farms explained (Part 1)
2. 2012 R2 Load-Balanced RDS farm
To load balance sessions in an RD Session Host server farm, you can use the RD Connection Broker Load Balancing feature together with Domain Name System (DNS) round robin. To configure DNS, you must create a DNS host resource record for each RD Session Host
server in the farm that maps the RD Session Host server’s IP address to the RD Session Host server farm name in DNS.
Checklist: Create a Load-Balanced RD Session Host Server Farm by Using RD Connection Broker
Hope it helps!
Thanks,
Dharmesh

CSS Load Balancing Citrix Terminal server, is ti possible ?

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