Fortigate Load Balancing Issue

[bagusr]

I have 2 connections with load balance settings The connection works smoothly and traffict has passed 2 links. But I'm having a bit of trouble, from my users suddenly unable to access the web content while it can be ping, it happens just a few seconds, then normal again.

Has anyone ever experienced something like me? Please help give me advice,

My Configuration: - I use load balanced algorithm with Volume Based - in DNS, primary dns using dns from isp 1, dns secondary from isp 2

[ede_pfau]

I bet it's a DNS issue.

Often, ISP1 will not accept DNS requests coming from ISP2's hosts. You can test if this is the issue by

- browsing with IP addresses (OK, that will take some preparation)

- using a 'neutral' DNS like 9.9.9.9 or 9.9.9.10

[rwpatterson]

ede_pfau wrote:

I bet it's a DNS issue.

Often, ISP1 will not accept DNS requests coming from ISP2's hosts. You can test if this is the issue by

- browsing with IP addresses (OK, that will take some preparation)

- using a 'neutral' DNS like 9.9.9.9 or 9.9.9.10

+1

[Deepakkhw]

Hi,

have you checked DNS resolution at the same time with help of NSlookup tool?

What was the error on your browser?

Is it happen for all Users / Some users / Specific user?

What are CPU and RAM uses on the FortiGate (In peak time and normal time)?

Regards,

Deepak Kumar