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Stefan_Klotz_85's avatar
Stefan_Klotz_85
Icon for Cirrus rankCirrus
Nov 21, 2014

Clone pool with two servers

Hi,

 

clone pool doesn't seem a very well documented feature so I didn't found anything about it. We have the requirement to clone serverside traffic to TWO servers. To put two servers in the clone pool shouldn't be an issue, but how does the LB behave? Will it really be send out twice to each server or only to one of them? And if just to one server, always to the same or based on Round Robin?

 

Is this possible at all?

 

Thank you!

 

Ciao Stefan :)

 

application delivery
LTM

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  • nitass's avatar
    nitass
    Icon for Employee rankEmployee
    Nov 22, 2014

    i did test and it seems traffic is cloned to one clone pool member (not all the member) and clone pool member is selected on every new connection (existing connection will use the same clone pool member).

     

  • Stefan_Klotz's avatar
    Stefan_Klotz
    Icon for Cumulonimbus rankCumulonimbus
    Nov 28, 2014

    How can I sniffer the traffic towards the clone pool member or at least verify that something is correctly sent out? Because filtering on the IP is not possible as just the MAC-address of the clone pool member will be used. Thank you!

     

    Ciao Stefan :)

     

  • nitass's avatar
    nitass
    Icon for Employee rankEmployee
    Nov 30, 2014

    we can filter by server/pool member ip on clone pool vlan, can't we?

     tcpdump -nni (clone pool vlan):nnn -s0 -w /var/tmp/output.pcap host (server/pool member ip) -v
  • Stefan_Klotz's avatar
    Stefan_Klotz
    Icon for Cumulonimbus rankCumulonimbus
    Dec 01, 2014

    My problem is, that the clone pool member is also in use in another "normal" virtual server pool.

     

    But based on another thread here in the forum I thought that cloned traffic will not be sent to the IP-address of the clone pool member, but to its MAC-address. The source- and destination-IPs will stay untouched in the cloned traffic. Shouldn't be the filter something like "MAC-address of clone pool member AND IP-address of real virtual server pool member"? And can someone provide me the syntax for MAC-address filtering?

     

    Ciao Stefan :)

     

  • Stefan_Klotz's avatar
    Stefan_Klotz
    Icon for Cumulonimbus rankCumulonimbus
    Dec 01, 2014

    Thanks nitass, luckily the real server/pool member and the clone pool member are NOT using the same VLAN, so I could use your initial tcpdump command and I saw traffic. So it seems to work correctly or is there anything else I need to take care about?

     

    Ciao Stefan :)