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PIX , NAT and QOS

a.pawar
Level 1
Level 1

Hi

Will the NATing at the Firewall reset the QOS info in the IP header ? As per my understanding it should not. Could someone please confirm this as what is the default behaviour.

Thanks

Ati

1 Reply 1

gfullage
Cisco Employee
Cisco Employee

Certainly not. Only the IP address is changed (and the checksum), and for certain protocols it will change any IP addresses in the data portion of the packet also. The QoS info is not touched as it goes through.

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