Azure No Arp
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Azure No Arp

L5 Sessionator

Hey All,

 

I'm coming across a weird issue here.

 

We have two subents in Azure. Let's call them Subnet1 and Subnet2

 

Subnet1 has a UDR to point traffic to the internal interface of the firewall.

 

This works, we see the traffic come into the firewall. We don't see any return traffic from the server in subnet 2. There is a static route pointing to the azure fabric .1 address.

 

When I do a flow basic, the firewall is unable to send the traffic to the gateway (azure .1 address) because there is no ARP.

 

Route found, interface ethernet1/2, zone 2, nexthop 10.38.225.1

Resolve ARP for IP 10.38.225.1 on interface ethernet1/2

ARP pending

Packet dropped, no ARP

 

HELP!

10 REPLIES 10

Hello,

 

I had the same problem and managed to get it sorted. I orignally was this accepted answer but didnt really understand it.

Take a look at my post and it might clear things up.
https://live.paloaltonetworks.com/t5/general-topics/azure-palo-alto-arp-not-found/m-p/336411/thread-...

 

Thanks

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