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Celine_LOUEDIN_'s avatar
Celine_LOUEDIN_
Icon for Nimbostratus rankNimbostratus
May 28, 2015

Isp link test on LTM

Hi,

 

I have two SMTP servers and two ISP. Each SMTP server is using a different ISP link. I would like to load balance SMTP (outbond) between these two servers. The problem is how to tell LTM not to send mail to one server when the ISP link behind is down ?

 

Thanks

 

  • Alexander_Dube_'s avatar
    Alexander_Dube_
    May 29, 2015

    Hi,

     

    if you can ping the gateway for every ISP links, this should be easy.

     

    Just create an icmp monitor for every ISP link and add in the field "Alias Address" the gateway for this link.

     

    Then you can assign the isp specific monitors to the specific node. If the ping fails, the ltm will disable the node.

     

    If the ltm cannot ping the gateway, you have to move the monitoring for the ISP links you to your smtp servers. You can create a cronjob, which monitors the ISP links and if a link fails, just disable the smtp server. Then the LTM will notice a failed node and will take down it.

     

    Regards Alex

     

  • Alexander_Dube_'s avatar
    Alexander_Dube_
    Icon for Altocumulus rankAltocumulus
    May 29, 2015

    Hi,

     

    if you can ping the gateway for every ISP links, this should be easy.

     

    Just create an icmp monitor for every ISP link and add in the field "Alias Address" the gateway for this link.

     

    Then you can assign the isp specific monitors to the specific node. If the ping fails, the ltm will disable the node.

     

    If the ltm cannot ping the gateway, you have to move the monitoring for the ISP links you to your smtp servers. You can create a cronjob, which monitors the ISP links and if a link fails, just disable the smtp server. Then the LTM will notice a failed node and will take down it.

     

    Regards Alex