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East-west traffic within azure single Vnet

L1 Bithead

Regarding East-west traffic within azure single Vnet, in this Guide page 127 states

 

"Azure networking does not require the use of source NAT on the firewall to enforce

symmetry if both directions of the flow pass through the same Azure internal loadbalancer

front-end IP and backend pool. The private subnets have UDRs directing East/

West traffic to the firewall layer, so NAT is not required."

 

 

What I don’t understand if you don’t enable session persistence in LB setup (page:97) what forces the return traffic to be load balanced to the same firewall.

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