Clarity

Hi All,

I've read a lot on the subject but I still encounter an issue on Multicasting in a client configuration (cluster of 2 servers).

Context :
- CA PPM Version : 13.3.0.7.8 (13.3 Patch 7)
- OS : Windows 2008R2 Service Pack 1
- Hostname : 2 servers QPAGCE8V2032 (126.246.153.36) and QPAGCE8V2033 (126.246.153.37)
- Multicast IP : 239.0.1.25 on Port 9090

- No Firewall on both servers

I can make the connection between the 2 servers (both ways) with the library jgroups-all.jar.

Example with 2032 as Master and 2033 as Slave.

1/ Sender 2032

java org.jgroups.tests.McastSenderTest -mcast_addr 239.0.1.25 -port 9090 -bind_addr 126.246.153.36
Socket=0.0.0.0/0.0.0.0:62630, ttl=32, bind interface=0.0.0.0/0.0.0.0
> 1
> << Received response from 126.246.153.37:9090: Hello from Bela
2
> << Received response from 126.246.153.37:9090: Hello from Bela
3
> << Received response from 126.246.153.37:9090: Hello from Bela

2/ Receiver 2033

java org.jgroups.tests.McastReceiverTest -mcast_addr 239.0.1.25 -port 9090 -bind_addr 126.246.153.37
Socket=0.0.0.0/0.0.0.0:9090, bind interface=0.0.0.0/0.0.0.0 
1 [sender=126.246.153.36:62630]
2 [sender=126.246.153.36:62630]
3 [sender=126.246.153.36:62630]

I can see both servers on the CSA console but when I use the admin tower command, I see Discovered Clients: None.

> admin tower
-------------------------------------------------------------------
GMS: address=QPAGCE8V2032-39417, cluster=CLRTY-SA, physical address=126.246.153.36:60451
-------------------------------------------------------------------
> refresh
> list clients
Discovered Clients:
--------------------------
None
--------------------------

I've made the following tests :

- Use of another IP Address in the scope 239.0.1.25

- Use of another Port other than 9090

- Reset of the CSA password on both servers

- Change of the order of NIC in the Network Advanced Settings (a bit tricky on Windows)

- Change of the Bind Addresses on both servers (126.246.153.36,126.246.153.37, 126.246.153.36 alone, 126.246.153.36,126.246.153.37 alone or null values)

I don't see the key word "MULTICAST" on Windows command ipconfig / all (I always see it on RHEL). I don't know it it's important or not for CA PPM ?

> ipconfig /all

Windows IP Configuration

Host Name . . . . . . . . . . . . : QPAGCE8V2032
 Primary Dns Suffix . . . . . . . : sigcesie.caisse-epargne.fr
 Node Type . . . . . . . . . . . . : Hybrid
 IP Routing Enabled. . . . . . . . : No
 WINS Proxy Enabled. . . . . . . . : No
 DNS Suffix Search List. . . . . . : sigcesie.caisse-epargne.fr
 sirissie.caisse-epargne.fr
 caisse-epargne.fr

Ethernet adapter PROD:

Connection-specific DNS Suffix . :
 Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Network Connection
 Physical Address. . . . . . . . . : 00-50-56-AE-7B-CD
 DHCP Enabled. . . . . . . . . . . : No
 Autoconfiguration Enabled . . . . : Yes
 IPv4 Address. . . . . . . . . . . : 126.246.153.36(Preferred)
 Subnet Mask . . . . . . . . . . . : 255.255.255.0
 Default Gateway . . . . . . . . . : 126.246.153.3
 DNS Servers . . . . . . . . . . . : 126.246.65.10
 126.246.149.13
 NetBIOS over Tcpip. . . . . . . . : Enabled

A few attachments to this post (properties.xml of both servers included).

Any ideas ?

Thx in advance for ur help,

David

Hi David,

Did you check with your network team, if the multicast address provided by you IT department is a valid multicast or not. Do you have UDP protocol enabled in your network.

Regards

Suman Pramanik 

Hello Suman,

Yes, normally, multicast is activated on the network layer. I assume the test with the library jgroups-all.jar wouldn't work it it wasn't the case ?

I think the problem comes from the Windows servers but I don't know where to look.

Thx,

David

Hi again,,

I'm adding a test made by the network team according the multicast. The multicast is working from their point of view :

SIR2-AZ31-N5K-61# sh ip igmp snooping group vlan 853
Type: S - Static, D - Dynamic, R - Router port, F - Fabricpath core port s on 

Vlan  Group Address      Ver  Type  Port list
853   */*                -    R     Po1 Po701
853   224.0.75.75        v3   D     Eth106/1/11 Eth102/1/12
853   239.0.1.25         v3   D     Eth106/1/11 Eth102/1/12
853   239.2.11.71        v3   D     Eth116/1/1
853   239.255.255.250    v3   D     Eth120/1/1 Eth106/1/3 

QPAGCE8V2032 (126.246.153.36) is on interface 102/1/12
QPAGCE8V2033 (126.246.153.37) is on interface 106/1/11

Still, I get the error message on the Clarity servers :

admin tower
-------------------------------------------------------------------
GMS: address=QPAGCE8V2032-34074, cluster=CLRTY-SA, physical address=126.246.153.36:58684
-------------------------------------------------------------------
NSA Tower Shell
> refresh
> list clients
Discovered Clients:
--------------------------
None
--------------------------

Could it be the ESX servers which drop the multicast messages ?

Thx,

David

Yes, the ESX servers could be part of the problem.  Try vmotioning all of the apps to the same ESX server and see if the problem is resolved.  If it is, that is causing the problem.

However, I also noticed you are running version 13.3.  There was a known bug in that version of Clarity with the admin tower command that was fixed in 14.1 and above.

Check your admin.bat file (located in the bin directory).

Does it contain the following in the PROGRAM_ARGS statement:

-Djava.net.preferIPv4Stack=true

If not, please add it and restart the CA PPM services.

Let us know whether or not either of these fixes your problem.

Jeanne

Thx Jeanne, it worked ! 

Just a last question, do I need to modify the files service*.conf as well to include the property preferIPv4Stack ?

David

Hi David,

I don't remember hearing anything about having to modify the services.conf file.  The workaround I gave you is what was listed as the workaround for that issue.  I don't recall ever having to do anything else to prevent this problem from reoccurring.

Jeanne