Extend TCP Proxy vs. Client load balancing

I am unclear how proxy and client load balancing interact with respect to custom address providers. If I define my own address provider, and I do NOT set the load-balancer parameter to client in the client configuration, will the proxy still do load balancing of connections as described in http://docs.oracle.com/cd/E24290_01/coh.371/e22839/gs_configextend.htm#BEBCICDA ?
Edited by: user5179040 on Mar 23, 2012 9:43 AM

Hi,
The <load-balancer> element is only configured in the <proxy-scheme> and not at the client side. This parameter "proxy" dictates the proxy to use the specified strategy for load balancing client connections across proxies. The parameter "client" offloads the responsibility of load balancing to client across proxies or randomly select proxies.
I am unclear how proxy and client load balancing interact with respect to custom address providers. If I define my own address provider, and I do NOT set the load-balancer parameter to client in the client configuration, will the proxy still do load balancing of connections as described in http://docs.oracle.com/cd/E24290_01/coh.371/e22839/gs_configextend.htm#BEBCICDA ?
Hope this helps!
Cheers,
NJ

Similar Messages

H-REAP and Client Load-Balancing

I'm told by Cisco that H-REAP does not support client load-balancing.
We have a situation where we want to deploy LWAPPs using H-REAP into a conference room where training would take place.
Any suggestions on how to overcome the inevitable slowness these people are going to experience from being unevenly associated with the APs?
We can't re-write the application so we are looking for a wireless solution.
Anyone hear about how other organizations have dealt with this type of situation?
I'll be glad to supply more details if I am not being clear in my description of the problem.
Thanks in advance. All responses will be rated.
Paul

This is the functionality which is missing in H-REAP: Client and Network Load Balancing
"Radio Resource Management (RRM) load-balances new clients across grouped lightweight access points reporting to each controller. This function is particularly important when many clients converge in one spot (such as a conference room or auditorium) because RRM can automatically force some subscribers to associate with nearby access points, allowing higher throughput for all clients. The controller provides a centralized view of client loads on all access points. This information can be used to influence where new clients attach to the network or to direct existing clients to new access points to improve wireless LAN performance. The result is an even distribution of capacity across an entire wireless network.
Note: Client load balancing works only for a single controller. It is not operate in a multi-controller environment."
I suppose if we limit the number of users that can associate with a particular AP then we will achieve some client load-balancing. Though a hard limit on the number of end-users will also lead to situations where some end users will not be allowed any access.

WLC 7.5.102.0 Client Load Balancing

Hi,
Regarding 'Client Load Balancing' feature in WLC code 7.5.102.0, which one will take precedence:
- Load Balancing enabled in RF Profile and applied in an AP Group.
- Load Balancing enabled in WLAN
Also, is there any way to determine the statistics of the Load Balancing in RF Profile? (similar to the Statistics for Client Load Balancing enabled per WLAN in Wireless> Advanced > Load Balancing > Load Balancing Statistics)
Thanks in advance!
- edison

RF Profiles overrides any global settings, just like AP Groups can override the vlan or interface mappings.
say for example, I want to leverage the RF Profile for highly dense deploytment (like Town Hall or influx of users) and as result i want to deploy more temp APs that will coexist my existing APs. I just want to modify the High Density parameter - limiting the max clients only. but the RF Profile comes with the Load Balancing too and i don't think it cannot be disabled separately.
> Load balacing is enabled on the WLAN and isn't in the RF Profile. High Desnity, you create a RF Profile to disable the lower data rates, maybe 54 and 36 as mandatory and 24 and or 48 supported... depends on how much you want to shrink your cells. Also setting the max and min TX power.... no need for load balancing if you shrink the cells down.
so when i apply the RF Profile to the AP Group, the profile's Load Balancing settings will also be applied together with my preferred High Density settings - while my WLAN settting is not enabled with Load Balancing.
> No.... you either enable load balancing on the WLAN or not. The screen shot I showed you is a threshold configuration if its enabled.
Thanks,
Scott
*****Help out other by using the rating system and marking answered questions as "Answered"*****

[svn:bz-trunk] 13477: Bug: BLZ-455 - Document client-load-balancing property in the sample config

Revision: 13477
Revision: 13477
Author:   [email protected]
Date:     2010-01-13 05:17:10 -0800 (Wed, 13 Jan 2010)
Log Message:
Bug: BLZ-455 - Document client-load-balancing property in the sample config
QA: No
Doc: No
Ticket Links:
    http://bugs.adobe.com/jira/browse/BLZ-455
Modified Paths:
    blazeds/trunk/resources/config/services-config.xml

Client Load balancing in AS with RAC

Friends,
1. Is an application servers cluster supports client load balancing.
If not....
2. if RAC is configured with appplication servers:
client -> appl sever -> rac_node -> shared database
is there a possibility to configure CLIENT load balancing with the aid of any of the above
components (or smth else that i missed) i.e. avoid using hardware client load balancing
or third party software client load balancing???
Thanks much for help.

Hi, I have the same question.
I am using RAC (11.1.0.7) and would like to load balance two application servers in the same way, for apache, forms and reports using 10.2.0.4 iAS FAR.
If I could load balance the apache connection, I'm sure it would be simple from there, again, I only have software load balancing available.
Could you point me to a doco?
Thank you very much.

Coherence Extend Address-provider for dynamic load balancing

Hi,
I want to have load balancing across my proxies. so, trying to use <address-provider> feature.
Here is my setup,
I have two proxies and many clients.I am configuring both proxy and the client to use load sharing scheme.
There are implemented classes for the interface AddressProvider. So, i am going to use that.
Here is proxy server settings,
<proxy-scheme>
<service-name>ExtendTcpProxyService</service-name>
<thread-count>10</thread-count>
<acceptor-config>
<tcp-acceptor>
<address-provider>
<class-name>com.tangosol.net.RefreshableAddressProvider</class-name>
</address-provider>
</tcp-acceptor>
</acceptor-config>
<autostart>true</autostart>
</proxy-scheme>
I know there is some silly mistake with that,
I am getting error message in the following log,
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.emc.srm.common.daemon.SrmDaemon.start(SrmDaemon.java:59)
... 5 more
Caused by: (Wrapped: Missing or inaccessible constructor "com.tangosol.net.RefreshableAddressProvider()"
<address-provider>
<class-name>com.tangosol.net.RefreshableAddressProvider</class-name>
</address-provider>) java.lang.InstantiationException
at com.tangosol.util.Base.ensureRuntimeException(Base.java:293)
at com.tangosol.run.xml.XmlHelper.createInstance(XmlHelper.java:2542)
at com.tangosol.run.xml.XmlHelper.createInstance(XmlHelper.java:2426)
at com.tangosol.net.ConfigurableAddressProvider.createAddressProvider(ConfigurableAddressProvider.java:277)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.peer.acceptor.TcpAcceptor.configure(TcpAcceptor.CDB:78)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.ProxyService.configure(ProxyService.CDB:67)
at com.tangosol.coherence.component.util.SafeService.startService(SafeService.CDB:6)
at com.tangosol.coherence.component.util.SafeService.ensureRunningService(SafeService.CDB:27)
at com.tangosol.coherence.component.util.SafeService.start(SafeService.CDB:14)
at com.tangosol.net.DefaultConfigurableCacheFactory.ensureServiceInternal(DefaultConfigurableCacheFactory.java:1057)
at com.tangosol.net.DefaultConfigurableCacheFactory.ensureService(DefaultConfigurableCacheFactory.java:892)
at com.tangosol.net.DefaultCacheServer.startServices(DefaultCacheServer.java:81)
at com.tangosol.net.DefaultCacheServer.intialStartServices(DefaultCacheServer.java:250)
at com.tangosol.net.DefaultCacheServer.startAndMonitor(DefaultCacheServer.java:55)
at com.tangosol.net.DefaultCacheServer.main(DefaultCacheServer.java:197)
... 10 more
Caused by: java.lang.InstantiationException
at sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance(InstantiationExceptionConstructorAccessorImpl.java:30)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at java.lang.Class.newInstance0(Class.java:355)
at java.lang.Class.newInstance(Class.java:308)
at com.tangosol.util.ClassHelper.newInstance(ClassHelper.java:587)
at com.tangosol.run.xml.XmlHelper.createInstance(XmlHelper.java:2501)
... 23 more
Cannot start daemon
First question:
1) without address provider section in the proxy server configuration xml, will it use any default address provider implementation?
2) what's wrong with the proxy server settings xml which causes above error?
Thanks
Prab

Hi LuK,
Sounds like there is no load balancing is happening in my environment.
I didn't use address provider tag since it's mentioned in AddressProvider Interface API that by default it uses ConfigurableAddressProvider implementation.
Here is a xml snippet in remote client cache configuration xml,
<tcp-initiator>
*<remote-addresses>*
*<socket-address>*
*<address>PROXY-A</address>*
*<port>9099</port>*
*</socket-address>*
*<socket-address>*
*<address>PROXY-B</address>*
*<port>9099</port>*
*</socket-address>*
*</remote-addresses>*
<connect-timeout>10s</connect-timeout>
</tcp-initiator>
what i mean by load balancing is,
I will be having lot of web service queries which runs very fast. I would like to see both the proxies serves the web requests.
I am observing, One connection has been made to one proxy when it's starts up and keep hold on to it (no matter whether other proxy is free or not).
is it a bug? or am i doing some mistake?
Thanks
Prab

Shared public IP with same tcp port (round robin/load balance)

Hi all,
I want to know if I can do that with my ASA5515-X, I have two servers that can do the same thing, there are SSO servers, What I want to do is to publish the 2 servers on Internet with the same public IP address and on TCP 443.
Is it supported ? will it works like load balancing per sessions ?
or do I need to add an HLB between ASA and my SSO servers ?
Thanks

Hi Yann,
You can configure the ASA to allow traffic to your SSO server from outside on two public IP's. Users can hit either of the IP to reach the inside server. Now, load balancing would be achieved based on source devices sending request to public IP's. If source machine son internet use one public IP more to access the server, ASA can't do anything to load balance in such scenario. Here is how you can accomplish this:
Assuming SSO server on inside is 192.168.16.110 and two public IP's are 192.168.17.110 and 192.168.17.111
object network SSO_1
host 192.168.17.110
object network SSO_2
host 192.168.17.111
object network SSO
host 192.168.16.110
object service https
service tcp source eq https
nat (inside,outside) source static SSO SSO_1 service https https
nat (inside,outside) source static SSO SSO_2 service https https
Hostname(config)# sh xl
2 in use, 6 most used
Flags: D - DNS, i - dynamic, r - portmap, s - static, I - identity, T - twice
TCP PAT from inside:192.168.16.110 443-443 to outside:192.168.17.110 443-443
    flags sr idle 0:00:06 timeout 0:00:00
TCP PAT from inside:192.168.16.110 443-443 to outside:192.168.17.111 443-443
    flags sr idle 0:00:08 timeout 0:00:00
Verification:
Hostname(config)#    packet-tracer input outside tcp 4.4.4.4 discard 192.168.17.110 443
Phase: 1
Type: UN-NAT
Subtype: static
Result: ALLOW
Config:
nat (inside,outside) source static SSO SSO_1 service https https
Additional Information:
NAT divert to egress interface inside
Untranslate 192.168.17.110/443 to 192.168.16.110/443
Phase: 2
Type: ACCESS-LIST
Subtype: log
Result: ALLOW
Config:
access-group outside in interface outside
access-list outside extended permit ip any any
Additional Information:
Phase: 3
Type: CONN-SETTINGS
Subtype:
Result: ALLOW
Config:
Additional Information:
Phase: 4
Type: IP-OPTIONS
Subtype:
Result: ALLOW
Config:
Additional Information:
Phase: 5
Type: NAT
Subtype: rpf-check
Result: ALLOW
Config:
nat (inside,outside) source static SSO SSO_1 service https https
Additional Information:
Phase: 6
Type: IP-OPTIONS
Subtype:
Result: ALLOW
Config:
Additional Information:
Phase: 7
Type: FLOW-CREATION
Subtype:
Result: ALLOW
Config:
Additional Information:
New flow created with id 3670, packet dispatched to next module
Result:
input-interface: outside
input-status: up
input-line-status: up
output-interface: inside
output-status: up
output-line-status: up
Action: allow
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Hostname(config)#    packet-tracer input outside tcp 4.4.4.4 discard 192.168.17.111 443
Phase: 1
Type: UN-NAT
Subtype: static
Result: ALLOW
Config:
nat (inside,outside) source static SSO SSO_2 service https https
Additional Information:
NAT divert to egress interface inside
Untranslate 192.168.17.111/443 to 192.168.16.110/443
Phase: 2
Type: ACCESS-LIST
Subtype: log
Result: ALLOW
Config:
access-group outside in interface outside
access-list outside extended permit ip any any
Additional Information:
Phase: 3
Type: CONN-SETTINGS
Subtype:
Result: ALLOW
Config:
Additional Information:
Phase: 4
Type: IP-OPTIONS
Subtype:
Result: ALLOW
Config:
Additional Information:
Phase: 5
Type: NAT
Subtype: rpf-check
Result: ALLOW
Config:
nat (inside,outside) source static SSO SSO_1 service https https
Additional Information:
Phase: 6
Type: IP-OPTIONS
Subtype:
Result: ALLOW
Config:
Additional Information:
Phase: 7
Type: FLOW-CREATION
Subtype:
Result: ALLOW
Config:
Additional Information:
New flow created with id 3671, packet dispatched to next module
Result:
input-interface: outside
input-status: up
input-line-status: up
output-interface: inside
output-status: up
output-line-status: up
Action: allow
Sourav

How to determine if extend TCP proxy isn't running?

I've setup a Coherence cluster using nodes Coh-A and Coh-B. I have a TCP proxy running on both the nodes on port 9098.
My application is able to the talk (i.e., both get and set) to the cluster through the TCP proxies.   All is fine when the coherence servers are up and running. I was curious to see the behavior of the system when coherence servers are down. My requirement is such that, it should have no impact on the system if coherence is down. The application should instead bypass Coherence and go the database. But this isn't happening (logs below). Is there any way to check if the coherence server is reachable (up and running) before trying to access the cache from the application code?
2013-11-13 16:30:12.060/1660.501 Oracle Coherence GE 3.7.1.0 <D5> (thread=[ACTIVE] ExecuteThread: '1' for queue: 'weblogic.kernel.Default (self-tuning)', member=n/a): Connecting Socket to 10.246.28.18:9098
2013-11-13 16:30:12.062/1660.502 Oracle Coherence GE 3.7.1.0 <Info> (thread=[ACTIVE] ExecuteThread: '1' for queue: 'weblogic.kernel.Default (self-tuning)', member=n/a): Error connecting Socket to 10.246.28.18:9098: java.net.ConnectException: Connection refused
2013-11-13 16:30:12.062/1660.502 Oracle Coherence GE 3.7.1.0 <D5> (thread=[ACTIVE] ExecuteThread: '1' for queue: 'weblogic.kernel.Default (self-tuning)', member=n/a): Connecting Socket to 10.246.28.3:9098
2013-11-13 16:30:12.063/1660.503 Oracle Coherence GE 3.7.1.0 <Info> (thread=[ACTIVE] ExecuteThread: '1' for queue: 'weblogic.kernel.Default (self-tuning)', member=n/a): Error connecting Socket to 10.246.28.3:9098: java.net.ConnectException: Connection refused
2013-11-13 16:30:12,117 [[ACTIVE] ExecuteThread: '1' for queue: 'weblogic.kernel.Default (self-tuning)'] ERROR errors.GrailsExceptionResolver - Exception occurred when processing request: [GET] /api/cafe/601272
Stacktrace follows:
com.tangosol.net.messaging.ConnectionException: could not establish a connection to one of the following addresses: [10.246.28.18:9098, 10.246.28.3:9098]; make sure the "remote-addresses" configuration element contains an address and port of a running TcpAcceptor
        at com.tangosol.coherence.component.util.daemon.queueProcessor.service.peer.initiator.TcpInitiator.openConnection(TcpInitiator.CDB:120)
        at com.tangosol.coherence.component.util.daemon.queueProcessor.service.peer.Initiator.ensureConnection(Initiator.CDB:11)
        at com.tangosol.coherence.component.net.extend.remoteService.RemoteCacheService.openChannel(RemoteCacheService.CDB:5)
        at com.tangosol.coherence.component.net.extend.RemoteService.ensureChannel(RemoteService.CDB:6)
        at com.tangosol.coherence.component.net.extend.remoteService.RemoteCacheService.createRemoteNamedCache(RemoteCacheService.CDB:12)
        at com.tangosol.coherence.component.net.extend.remoteService.RemoteCacheService.ensureCache(RemoteCacheService.CDB:27)
        at com.tangosol.coherence.component.util.SafeNamedCache$CacheAction.run(SafeNamedCache.CDB:3)
        at java.security.AccessController.doPrivileged(Native Method)
Thanks,
Anand

Cant we catch the mentioned exception and if that appears we can redirect the query to database

Wireless clients load balancing on the APs on WLC 4404

Hi Experts,
I'm just wondering if the WLC 4404 with firmware 4.2.207.0 can load balance the wireless clients on different WAPs. Let's say that an AP is already handling 15 Wireless devices. When the 16th is trying to join, the controller somehow puts it on another nearby AP, even the signal from this AP is weaker. I heard the similar feature on other Wireless solution vendors. I'm just wondering if Cisco has the similar feature or not.
Thanks!

Yes it is known as aggressive load balancing sending a code 17 making the wireless client to loook at another nearby AP.
here it is the documentation:
http://www.cisco.com/en/US/products/ps6366/products_tech_note09186a00809c2fc3.shtml

Client load-balancing

Hi all,
a short question.
Is there a feature in Cisco WLC like load-balancing based on bandwidth utilization?
What I mean is, one AP (channel6) has a channel utilization of 40%, the neighbor AP (channel 11) has a channel utilization of 10%.
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many thanks
Martin

It doesnt work worth a crap anyway ... Most clients don't adhere to code 17 so what's the point ...
Aggressive load-balancing works at the association phase. If enabled and the conditions to load-balance are met, when a wireless client attempts to associate to a LAP, association response frames are sent to the client with an 802.11 response packet that includes status code 17. This code indicates that the AP is too busy to accept any more associations.
It is the responsibility of the client to honor, process or discard that association response frame with reason code 17. Some clients ignore it, even though it is part of the 802.11 specification. The standard dictates that the client driver must look for another AP to connect to since it receives a "busy" message from the first AP it tries. Many clients do not do this and send the association request again. The client in question is allowed on to the wireless network upon subsequent attempts to associate.

Reverse proxy plugin vs load balancer plugin

Hi,
May i know what is the differents between reverse proxy plugin(passthrough) and load balancer plugin?
Regards
haw_9368

The Load Balancer plugin was designed specifcally to allow the Web Server to be a HTTP end-point for Sun Application Server. It is an ancestor of the Reverse Proxy Plugin (generally this version was changed to be tolerant of HTTP from any origin server, and performance improvements, etc). This plugin further evolved and was integrated into Web Server 7.0.

Is apache reverse proxy server/F5 Load Balancer support to Sharepoint 2010

Hi ,
I have two tool for implement reverse proxy
-Apache reverse proxy
-F5 load balancer
Kindly let me know sharepoint 2010 support this,if support then how to configured.
Hasan Jamal Siddiqui(MCTS,MCPD,ITIL@V3),Sharepoint and EPM Consultant,TCS
|
| Twitter

Thanks Sebastian,
Please let me know,I have only NTLM Authentication,we are not using FBS.
For NTLM authentication what we need to do.
Hasan Jamal Siddiqui(MCTS,MCPD,ITIL@V3),Sharepoint and EPM Consultant,TCS
|
| Twitter

Proxy plugin for load balance

I set up a cluster with two managed servers , one is ServerA:8001 and another is ServerB :9001 , i have enabled SSL for both servers , the access URL for proxy is https://Server:80/Applicatiion , the purpose of proxy server is to transfer the request to cluster , my problem is when i enter "https://Server:80/Applicatiion" , the URL will be changed to one of managed server , like "https://ServerA:8001/Applicatiion" , where should i set to keep the URL freezed? Appreciate in advance for your response

Are you sure that while using https you can give 80 can port.
As this is default port for http but not for https try with 443 instead of 80.
you can try with following option
https://hostname:443/contextroot
or
https://hostname/contextroot.
But make sure that you specify in wlproxy https port as 443 or else it will never take into consider.
Regards,
Kal

Load Balancing in Reverse Proxy Mode

Hi,
Is the HTTP Load Balancing function working only in the Routing context or works it generally. I set the SJWPS as a Reverse Proxy like this
NameTrans fn="reverse-map" from="http://server1.domain.de" to="http://proxy.domain.de" rewrite-location="false" rewrite-content-location="false"
NameTrans fn="map" from="http://proxy.domain.de" to="http://server1.domain.de" rewrite-host="false"
NameTrans fn="map" from="/" to="http://server1.domain.de" rewrite-host="false"
Now the Proxy should do Load balancing with a second, mirrored server like http://server2.domain.de. How could I configure that?
Please help me.
InfoSeeker09
Edited by: InfoSeeker09 on Sep 11, 2009 2:18 AM

if you need to route / provide load balancing between 2 hosts, then you will need to have Route SAF . you can use web server 7 reverse proxy cli or gui to get this. however, you might want to start from a fresh configuration to avoid reverse-map / map that you have experimented with does not overlap with the 'Route' functionality that you seem to need here
here are some reference content
http://blogs.sun.com/amit/entry/setting_up_a_reverse_proxy
http://blogs.sun.com/meena/entry/configuring_reverse_proxy_in_sun
http://www.sun.com/bigadmin/features/articles/web_server_zones.jsp

How can I support a health check, from a load balancer?

My company has load balancers which use health checks to determine if the end point is available for client traffic. The basic health check is a tcp ping, and will tell you if the device is on the network. The next level of health check is an http request. This request, and the response are static, you can’t create your own version of the request and response. The standard request is this:
     http://host:port/healthcheck/hc.html
The standard response is this:
     “The server is available”
I want to use the load balancer as part of my total deployment. The problem is that I am not seeing how to support this health check request and response in the MDEX engine. What I see is this request
     http://host:port/admin?op=ping
Will return this response
     dgraph <host>: <port> responding at <day month year time>
It is nice that there is a built in ping, but I am not able to make use of it. I am new to Endeca and still poking around. The dgraph process listens on a port set up in <…>/config/script/AppContext.xml
<dgraph id="Dgraph1" host-id="MDEXHost" port="3281">
<properties>
<property name="restartGroup" value="A" />
<property name="updateGroup" value="a" />
</properties>
<log-dir>./logs/dgraphs/Dgraph1</log-dir>
<input-dir>./data/dgraphs/Dgraph1/dgraph_input</input-dir>
<update-dir>./data/dgraphs/Dgraph1/dgraph_input/updates</update-dir>
</dgraph>
(I am not using the default port, as I only have an instance on a shared server and have to worry about port clashing. But that is a different thread.)
In a standard tc Server install I can support this health check by doing this:
* Create a directory named “healthcheck”, in the “webapps” directory.
* Place a file name “hc.html” in that directory, which contains “The server is available”
The one hack which comes to mind is to write a servlet which would be able to be a smart proxy for the load balancer health check. It would pass along any regular traffic to the MDEX engine. But if the request was a health check it would send “admin?op=ping” to the MDEX engine, and for a good response from the engine, create and pass back the correct response to the load balancer.
Ideas, comments, flames, …
Thanks

Hi, we are using following String to test the MDEX ping response but we get the invalid version formation on dgraph.log -
following is on F5
GET /admin?op=ping HTTP/1.1/r/nHost:myhost.endeca.com:19000/r/nConnection:close/r/n/r/n
Following gets logged on Dgraph.log
WARN 09/05/12 05:30:03.799 UTC (1346823003799) DGRAPH {dgraph} Invalid version format in 'HTTP/1.1/r/nHost:myhost.endeca.com:19000/r/nConnection:close/r/n/r/n'
Please let me know - if you have any suggestions to solve this issue.
I know that it works from browser and wget from unix with following commands.
wget http://myhost.endeca.com:19000/admin?op=ping - from unix command line
from browser:
http://myhost.endeca.com:19000/admin?op=ping
Thanks,
Ram

Extend TCP Proxy vs. Client load balancing

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