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Damitha
Damitha
New Member
July 30, 2021
Question

Configuring one source IP to use Multiple Internet IP addresses

  • July 30, 2021
  • 2 replies
  • 6601 views

Hello

 

I have a requirement to distribute internal server > outgoing emails among multiple IP addresses. Is there any way to achieve this? I tried using IP Pool, but it doesn't work as when there is only one source it is using only one IP address from the pool to send the traffic out. Please help.

    2 replies

    isaravia
    isaravia
    New Member
    July 30, 2021

    Did you define Network > Interfaces > internal (Name of your Interface) (type Hardware Switch)?

     

    emnoc
    emnoc
    New Member
    July 30, 2021

    I doubt you can do that your choice would be to build ip alias and rotate thru them in a ip nat pool

     

    e.g

    email-server

      10.10.1.11 SNAT 38.0.2.11

      10.10.1.12 SNAT 38.0.2.12

      10.10.1.13 SNAT 38.0.2.13

     

    Many email compaign delivery servers works in the above fashion and they just shoft thru SNAT ip-pools to keep the number of email originating per pubic-ipv4 down to a minimum.

     

    Ken Felix

    Damitha
    DamithaAuthor
    New Member
    July 30, 2021

    Hello Ken

     

    Thank you for the reply. But how can we get three aliases (source IPs) from the email server?

    lobstercreed
    lobstercreed
    New Member
    July 30, 2021

    Another way to approach this in a load-sharing (not round-robin/load-balance) fashion is to specify different NAT pools based on the destination address. 

     

    If you're using Central NAT this would mean specifying multiple Central NAT policies for example from email IP to 0.0.0.0/2 using one public, from email to 64.0.0.0/2 using another, and so on.

     

    If you're not using Central NAT, you can do the same thing with multiple firewall policies.  From email IP to 0.0.0.0/2 and select a single 1-to-1 NAT, then copy that for the other 3.  Just have to make sure you don't have a policy matching from email IP to "all" above those rules.

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