Finding real server from session ID cookie

Greetings,
          running Weblogic express, 8.1.4, with 3 servers in a cluster.
          How can I determine which server handled a request when looking at a tcpdump from in front of a load balancer?
          I know the jsessionid cookie has the primary server ID at the end, but I can't find the ID value in any of the config files.
          Example cookie ID's are:
          -193723663
          242986410
          253184977
          They don't seem to be an obvious IP address/port conversion. Is there another way to find which server handled a request based on these cookie ID's?
          --Kurt

Thank you for the quick reply.
          Do you know if the JVM id's are persistent? Meaning once I do figure out which id for which server, will they stay the same through reboots/restarts, etc.?
          Also, if there is an easy way to have the server set a separate cookie value, like "server=IP", then I would not need to worry about the session ID. I'm not that familiar with weblogic to know how to do this.
          Regards,
          --Kurt

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ACE 4710: Find out the response time of a real server

Hi to everyone,
I have a couple of ACE 4710 and I need to find out what is the response time of a real server.
Is there a way for this?
Thank you for any answer!
giorgio romano

Hi,
Kindly add the following line in your serverfarm configuration:
predictor response syn-to-synack
Suppose your serverfarm looks like this:
serverfarm host AAA_FARM
predictor response syn-to-synack
probe HTTP_PROBE
probe TCP9001_PROBE
rserver SC106
inservice
rserver SC107
inservice
rserver SC108
inservice
rserver SC109
inservice
rserver SC110
inservice
rserver SC111
inservice
rserver SC112
inservice
rserver SC113
inservice
rserver SC114
inservice
rserver SC120
inservice
rserver SC131
inservice
And then use the following command to see the average response time from your rserver as follows:
ACE1/prod# show serverfarm AAA_FARM detail
serverfarm     : AAA_FARM, type: HOST
total rservers : 11
active rservers: 11
description    : ServerFarm AAA
state          : ACTIVE
predictor      : RESPONSE
method            : syn-to-synack
samples           : 8
failaction     : -
back-inservice    : 0
partial-threshold : 0
num times failover       : 0
num times back inservice : 0
total conn-dropcount : 0
Probe(s) :
HTTP_PROBE, type = HTTP
TCP9001_PROBE, type = TCP
----------connections-----------
real                  weight state        current    total      failures
---+---------------------+------+------------+----------+----------+---------
rserver: SC106
x.x.x.x.:0        8      OPERATIONAL 2          1125       0
max-conns            : 4000000   , out-of-rotation count : 0
min-conns            : 4000000
conn-rate-limit      : -         , out-of-rotation count : -
bandwidth-rate-limit : -         , out-of-rotation count : -
retcode out-of-rotation count : -
load value           : 0
average response time (usecs) : 81   ----> thats what you might be looking for
From other day :
rserver: SC114
x.x.x.x:0        8      OPERATIONAL 70         10903      2
max-conns            : 4000000   , out-of-rotation count : 0
min-conns            : 4000000
conn-rate-limit      : -         , out-of-rotation count : -
bandwidth-rate-limit : -         , out-of-rotation count : -
retcode out-of-rotation count : -
load value           : 0
         average response time (usecs) : 1334                       ----> thats what you might be looking for
For Serverfarm BBB_FARM
serverfarm     : BBB_FARM, type: HOST
total rservers : 1
active rservers: 1
description    : ServerFarm BBB
state          : ACTIVE
predictor      : RESPONSE
method            : syn-to-synack
samples           : 8
failaction     : -
back-inservice    : 0
partial-threshold : 0
num times failover       : 1
num times back inservice : 1
total conn-dropcount : 0
Probe(s) :
----------connections-----------
real                  weight state        current    total      failures
---+---------------------+------+------------+----------+----------+---------
rserver: SC208
x.x.x.x:0        8      OPERATIONAL 0          0          0
max-conns            : 4000000   , out-of-rotation count : 0
min-conns            : 4000000
conn-rate-limit      : -         , out-of-rotation count : -
bandwidth-rate-limit : -         , out-of-rotation count : -
retcode out-of-rotation count : -
load value           : 0
         average response time (usecs) : 0   ----> thats what you might be looking for
Use more detials for response predictor:
http://www.cisco.com/en/US/docs/app_ntwk_services/data_center_app_services/ace_appliances/vA3_1_0/configuration/slb/guide/rsfarms.html#wp1068831
Configuring the Application Response Predictor
To instruct the ACE to select the server with the lowest average response time for the specified response-time measurement based on the current connection count and server weight (if configured), use the predictor response command in server farm host or redirect configuration mode. This predictor is considered adaptive because the ACE continuously provides feedback to the load-balancing algorithm based on the behavior of the real server.
To select the appropriate server, the ACE measures the absolute response time for each server in the server farm and averages the result over a specified number of samples (if configured). With the default weight connection option configured, the ACE also takes into account the server's average response time and current connection count. This calculation results in a connection distribution that is proportional to the average response time of the server.
The syntax of this command is as follows:
predictor response {app-req-to-resp | syn-to-close | syn-to-synack}[samples number]
The keywords and arguments are as follows:
•app-request-to-resp—Measures the response time from when the ACE sends an HTTP request to a server to the time that the ACE receives a response from the server for that request.
•syn-to-close—Measures the response time from when the ACE sends a TCP SYN to a server to the time that the ACE receives a CLOSE from the server.
•syn-to-synack—Measures the response time from when the ACE sends a TCP SYN to a server to the time that the ACE receives the SYN-ACK from the server.
•samples number—(Optional) Specifies the number of samples over which you want to average the results of the response time measurement. Enter an integer from 1 to 16 in powers of 2. Valid values are 1, 2, 4, 8, and 16. The default is 8.
For example, to configure the response predictor to load balance a request based on the response time from when the ACE sends an HTTP request to a server to when the ACE receives a response back from the server and average the results over four samples, enter:
host1/Admin(config)# serverfarm SFARM1
host1/Admin(config-sfarm-host)# predictor response app-req-to-resp
samples 4
To reset the predictor method to the default of round-robin, enter:
host1/Admin(config-sfarm-host)# no predictor
To configure an additional parameter to take into account the current connection count of the servers in a server farm, use the weight connection command in server farm host predictor configuration mode. By default, this command is enabled. The syntax of this command is as follows:
weight connection
For example, enter:
host1/Admin(config)# serverfarm SF1
host1/Admin(config-sfarm-host)# predictor response app-request-to-resp
samples 4
host1/Admin(config-sfarm-host-predictor)# weight connection
To remove the current connection count from the calculation of the average server response time, enter:
host1/Admin(config-sfarm-host-predictor)# no weight connection
You can use threshold milliseconds parameter which is optional Specifies the required minimum average response time for a server. If the server response time is greater than the specified threshold value, the ACE removes the server from the load-balancing decision process (takes the server out of service).
Enter an integer from 1 to 300000 milliseconds (5 minutes). The default is no threshold (servers are not taken out of service).
In case if you have measures the response time from when the ACE sends a TCP SYN to a server to the time that the ACE receives a CLOSE from the server use syn-to-close      (already discussed previously)
If you have to measures the response time from when the ACE sends a TCP SYN to a server to the time that the ACE receives the SYN-ACK from the server use syn-to-synack   (already discussed previously)
SAMPLES parameter is optional and specifies the number of samples that you want to average from the results of the response time measurement and response time is used to select the server with the lowest response time for the requested response-time measurement. If you do not specify a response-time measurement method, the ACE uses the HTTP app-req-to-response method.
Whenever a server's load reaches zero, by default, the ACE uses the autoadjust feature to assign a maximum load value of 16000 to that server to prevent it from being flooded with new incoming connections. The ACE periodically adjusts this load value based on feedback from the server's SNMP probe and other configured options.
Using the least-loaded predictor with the configured server weight and the current connection count option enabled, the ACE calculates the final load of a real server as follows:
final load = weighted load Ã— static weight Ã— current connection count
where:
â€¢weighted load is the load reported by the SNMP probe
â€¢static weight is the configured weight of the real server
â€¢current connection count is the total number of active connections to the real server
The ACE recalculates the final load whenever the connection count changes, provided that the (config-sfarm-host-predictor) weight connection command is configured. If the (config-sfarm-host-predictor) weight connection command is not configured, the ACE updates the final load when the next load update arrives from the SNMP probe.
If two servers have the same lowest load (either zero or nonzero), the ACE load balances the connections between the two servers in a round-robin manner.
HTH
Plz rate if u find it useful.
Sachin

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Gilles, followup question. If I understand this, what you outlined above will allow traffic external coming into the 6500/CSM to be forwarded thru to the REAL server IPs. If it wasn't clear, I was trying to ping from the native-mode 6500 that contains the CSM. I've tried regular and extended pings using the CSM-configured server VLAN's IP and alias IP, but get no response back from any of the REAL server IP addresses.
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How can I find out the mail server from email address?
for example: If I know the email address is [email protected],
how to find the pop3 and smtp mail server?
THANK YOU

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You might want to pose this question in the networking forum too.

I have a Mac on my home network and also a Systemline music server on same network. My PC was able to find the server but my MAC cannot. I can ping the server from the mac, but cannot actually connect . Also can't add the mac as a location from server

I have a Mac on my home network and also a Systemline music server on same network. My PC was able to find the server but my MAC cannot. I can ping the server from the mac, but cannot actually connect . Also can't add the mac as a location from server, despite following the Systemline instructions that impy this can be done.
Can anyone please advise what I am doing wrong?

Hi LowLuster
Thanks for reply. I am not an expert on these sharing protocols but I think I have turned on SMB sharing but still wont connect. I tried adding netwrik drive by using cntrl K in finder and using smb\\network address but nothing. It is driving me mad!!

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Hi,
I have a problem with ACE;
We have multiple serverfarms configured in the ACE module based on the application and different VIPs related to it. We are running the ACE in bridging mode. Now the requirement is from one serverfarm real server wants communicate to the VIP of the second serverfarm...Is this possible..???? Wil some NATing help in this situation. Below is the configuration.
======================
/* Style Definitions */
table.MsoNormalTable
{mso-style-name:"Table Normal";
mso-tstyle-rowband-size:0;
mso-tstyle-colband-size:0;
mso-style-noshow:yes;
mso-style-priority:99;
mso-style-qformat:yes;
mso-style-parent:"";
mso-padding-alt:0in 5.4pt 0in 5.4pt;
mso-para-margin:0in;
mso-para-margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:11.0pt;
font-family:"Calibri","sans-serif";
mso-ascii-font-family:Calibri;
mso-ascii-theme-font:minor-latin;
mso-fareast-font-family:"Times New Roman";
mso-fareast-theme-font:minor-fareast;
mso-hansi-font-family:Calibri;
mso-hansi-theme-font:minor-latin;
mso-bidi-font-family:"Times New Roman";
mso-bidi-theme-font:minor-bidi;}
access-list LAN_Traffic remark For all IP Traffic
access-list LAN_Traffic line 10 extended permit ip any any
access-list LAN_Traffic line 20 extended permit icmp any any
probe http PORTAL_HTTP
passdetect interval 20
passdetect count 2
request method get url http://portal
expect status 0 600
probe http RMS_HTTP
request method get url /_wmcs
expect status 0 600
rserver host PORTAL1
ip address 172.22.11.241
inservice
rserver host PORTAL2
ip address 172.22.11.243
rserver host QGLRSPW1
inservice
rserver host RMS01
ip address 172.22.10.12
inservice
rserver host RMS02
ip address 172.22.10.8
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serverfarm host PORTAL
failaction purge
probe PORTAL_HTTP
rserver PORTAL1
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rserver PORTAL2
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serverfarm host RMS
failaction purge
probe RMS_HTTP
rserver RMS01
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rserver RMS02
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2 match virtual-address 172.22.10.166 tcp any
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3 match virtual-address 172.22.10.52 tcp eq https
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policy-map type loadbalance first-match PORTAL-POLICY
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policy-map multi-match SFARM-LB-POLICY
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class PORTAL
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interface vlan 800
description ACE Client Interface
bridge-group 1
mac-sticky enable
service-policy input SFARM-LB-POLICY
no shutdown
interface vlan 898
description ACE Server Interface
bridge-group 1
mac-sticky enable
no shutdown
interface bvi 1
ip address 172.22.11.151 255.255.252.0
alias 172.22.11.153 255.255.252.0
peer ip address 172.22.11.152 255.255.252.0
description Bridge Group for 800 and 898 Interfaces
no shutdown
ip route 0.0.0.0 0.0.0.0 172.22.8.17
===================================
Pleae help..Thanks in advance

Hello!
Well yes it would work. BUT...you have to change your config a bit. First you need to apply your accesslist to both interfaces, or the ACE will reject it, because it is acting as a firewall by default. And second you have to apply the policymap to both interfaces as well or you put the policymap globally on the ACE.

Windows 8.1 MDM not responding to more than one SyncML from MDM server per session

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1) Device is enrolled
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We are capturing the traffic in fiddler and found that device is not sending the next request where we are expecting the status for these commands.
The same is being repeated in all the requests client initiates. DM Client responds back only for one syncML sent by the MDM server per session.
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<SessionID>1</SessionID>
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<SourceRef>0</SourceRef>
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Hello Sreekanth,
I am facing similar issue, here is the behaviour description:
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2) Client initiates the connection with the MDM server defined in provisioning XML during enrollment.
3) MDM Server sends some commands as a SyncML response.
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The same is being repeated in all client request.
Below is the SyncML
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<SyncML xmlns="SYNCML:SYNCML1.2">
<SyncHdr>
<VerDTD>1.2</VerDTD>
<VerProto>DM/1.2</VerProto>
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<MsgID>1</MsgID>
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</Target>
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<LocURI>https://#####</LocURI>
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<MsgRef>1</MsgRef>
<CmdRef>0</CmdRef>
<Cmd>SyncHdr</Cmd>
<TargetRef>9302116</TargetRef>
<Data>212</Data>
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<CmdID>2</CmdID>
<MsgRef>1</MsgRef>
<CmdRef>2</CmdRef>
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<Data>200</Data>
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<Status>
<CmdID>3</CmdID>
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<CmdRef>3</CmdRef>
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Here
we had tried sending
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Hi,
I have two systems working together. I am passing session ID between these
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Ali Rýza

Hi again,
I am currently using this solution . I am sending WebLogicSession to a
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I am trying to find a different solution which I don't need to make a http
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Ali Riza
Muhtar Akbulut <[email protected]> wrote in message
news:[email protected]..
WebLogic puts a cookie called "WebLogicSession", which contains thesession id.
>
>
>
"Ali Rýza Soðukpýnar" wrote:
Hi,
I have two systems working together. I am passing session ID between
these
two systems. I have an session ID. And I want to find whichpersonalization
server user owns this session.
How can I find username from the session ID?
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Ali Rýza

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