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dragonflymr's avatar
dragonflymr
Icon for Cirrostratus rankCirrostratus
Feb 24, 2015

SNAT pool and Automap SNAT, LB algorithm

Hi,

 

In SOL7820 (https://support.f5.com/kb/en-us/solutions/public/7000/800/sol7820.html)) there is info that:

 

  1. If multiple floating self IP addresses are configured on the VLAN, the BIGIP system translates the address of client connections by alternating through a pool of all floating self IPs on the VLAN.

     

  2. The BIGIP system load balances SNAT pool connections between members using the least connections algorithm.

     

So is the same way used for both Automap and SNAT pool or different algorithms are used - can't find info for Automap.

 

Piotr

 

application delivery
design
LTM
TMOS

6 Replies

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  • Brad_Parker_139's avatar
    Brad_Parker_139
    Icon for Nacreous rankNacreous
    Feb 25, 2015

    "alternating through a pool of all floating self IPs on the VLAN" leads me to believe its round-robin between the available floating IPs on the VLAN for Automap. SNAT pool explicitly state a least connect connections algorithm.

     

    • dragonflymr's avatar
      dragonflymr
      Icon for Cirrostratus rankCirrostratus
      Feb 25, 2015
      I can recall that in some other doc there was note that RR is used for selfIP, but seeing least connection for SNAT pool I was wondering if something changed. Anyway, any idea why different LB is used for Automap and pool? Piotr
    • Brad_Parker_139's avatar
      Brad_Parker_139
      Icon for Nacreous rankNacreous
      Feb 25, 2015
      Automap is intended to be a quick and simple configuration if SNAT is needed. SNAT pools were created to be more robust and scale. SNAT pools give you much more control for this reason.
  • Brad_Parker's avatar
    Brad_Parker
    Icon for Cirrus rankCirrus
    Feb 25, 2015

    "alternating through a pool of all floating self IPs on the VLAN" leads me to believe its round-robin between the available floating IPs on the VLAN for Automap. SNAT pool explicitly state a least connect connections algorithm.

     

    • dragonflymr's avatar
      dragonflymr
      Icon for Cirrostratus rankCirrostratus
      Feb 25, 2015
      I can recall that in some other doc there was note that RR is used for selfIP, but seeing least connection for SNAT pool I was wondering if something changed. Anyway, any idea why different LB is used for Automap and pool? Piotr
    • Brad_Parker's avatar
      Brad_Parker
      Icon for Cirrus rankCirrus
      Feb 25, 2015
      Automap is intended to be a quick and simple configuration if SNAT is needed. SNAT pools were created to be more robust and scale. SNAT pools give you much more control for this reason.