ECMP Config for 2 Internet links Site (Dual ISP)

FabioGarcia — Thu, 03 May 2018 14:28:13 GMT

Hello Everyone!

Site with 2 X PA500 in HA

2 Internet Links

PANOS 7.1.16

ISP1 - 187.190.74.22 (internet dedicated)

ISP2 - 192.168.0.66 (DSL link)

Config done

Virtual Router 1 - RT-LAN

Virtual Router 2 - RT-WAN

@RT-LAN

0.0.0.0/0 points to next VR "RT-WAN"

@RT-WAN

0.0.0.0/0 points to 1/1, next hop 187.190.74.1, metric 10

0.0.0.0/0 points to 1/2, next hop 192.168.0.254, metric 10

Sec Rules OK, NAT rules OK

Problem description: For some reason, PA500 just uses ISP1.

If we go to routing table we see both paths OK... both 0.0.0.0 routes pointing to both ISPs, with "A S E" flags

If we try to trace from public ISP2 interface, PA500 sends the packets to ISP1

admin@FW-0001> traceroute source 192.168.0.66 host 8.8.8.8 >>>>>ISP2 interface
traceroute to 8.8.8.8 (8.8.8.8), 30 hops max, 40 byte packets
1 rindal-virtual-ethernet1-1-3.1664.totalplay.com.mx (187.190.74.3) 8.154 ms 7.897 ms 8.012 ms >>>>>ISP1 GW
2 10.180.59.84 (10.180.59.84) 3.950 ms 3.842 ms 3.899 ms
3 10.180.59.85 (10.180.59.85) 3.124 ms 3.147 ms 3.249 ms
^Cadmin@FW-0001>

We have another box in PANOS 8.0.6 confugured the samw way... and the behavior is 100% OK

>> ping from src ISP1 always goes out thru ISP1 link

>> ping from src ISP2 always goes out thru ISP2 link

Is there any ECMP BUG related to PANOS 7.1.16 ?

Is there any other best practices to follow ?

Thanks in advance!

Re: ECMP Config for 2 Internet links Site (Dual ISP)

Punit_Agrawal — Sun, 06 May 2018 23:32:22 GMT

What load balance method you are using?

Re: ECMP Config for 2 Internet links Site (Dual ISP)

BPry — Mon, 07 May 2018 17:31:07 GMT

@FabioGarcia,

PAN-88213 was supposted to address an issue that effected ECMP and session offloading where it sent traffic to an incorrect next hop.

It sounds more like you are running into PAN-77747 that was supposed to be addressed in 7.1.12. I would open a support ticket so that PA can look at things and verify that 7.1.16 maybe didn't introduce a bug.

Re: ECMP Config for 2 Internet links Site (Dual ISP)

edison.junior — Mon, 07 May 2018 19:32:25 GMT

Thanks for the reply..

we use IP Module

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ECMP Config for 2 Internet links Site (Dual ISP)

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Re: ECMP Config for 2 Internet links Site (Dual ISP)

Re: ECMP Config for 2 Internet links Site (Dual ISP)