ISP Failover and DHCP

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ISP Failover and DHCP

L3 Networker

Hello, I am following this guide to set up ISP failover.  https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000PLL8CAO

 

The problem is that my failover ISP (Starlink), does not provide me a static IP address  

 

How would you recommend accomplishing what I want to do when the failover ISP provides a DHCP address?

 

Thank you!

1 ACCEPTED SOLUTION

Accepted Solutions

Cyber Elite
Cyber Elite

Hi @RSteffens ,

 

If you want the static ISP to be primary, and the DHCP ISP to be secondary, configure the static route for the static ISP just like the document.  Then set the metric for the DHCP default route to be higher than the static route.

 

TomYoung_0-1673644886141.png

Only the default route to the static ISP will be active (A) in the route table (Show Runtime Stats).  When there is a failure (cannot ping the Path Monitoring IP addresses), that default route will be removed.  The DHCP ISP default route will then be used.

 

Very important!  Do not use only one destination IP address under Path Monitoring!  Use at least 2 with the Failure Condition set to "all."  Then if one public IP goes down for maintenance, your Internet does not fail over.

 

Thanks,

 

Tom

 

 

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2 REPLIES 2

Cyber Elite
Cyber Elite

Hi @RSteffens ,

 

If you want the static ISP to be primary, and the DHCP ISP to be secondary, configure the static route for the static ISP just like the document.  Then set the metric for the DHCP default route to be higher than the static route.

 

TomYoung_0-1673644886141.png

Only the default route to the static ISP will be active (A) in the route table (Show Runtime Stats).  When there is a failure (cannot ping the Path Monitoring IP addresses), that default route will be removed.  The DHCP ISP default route will then be used.

 

Very important!  Do not use only one destination IP address under Path Monitoring!  Use at least 2 with the Failure Condition set to "all."  Then if one public IP goes down for maintenance, your Internet does not fail over.

 

Thanks,

 

Tom

 

 

Help the community: Like helpful comments and mark solutions.

L3 Networker

Thank you so much!  That works perfectly!  I really appreciate your help. 

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