NAT packet flow?

[abhi-adte]

Hi,

Today I confuse about the packet flow in NAT bi-direction and Uni-direction nat?

Can some one please briefly explain how its work this technology or please share if possible any document?

Thanks,

Abhinay

[varrao]

Can you be a bit more specific, what differnce are you looking for in bi-directional nat or uni-directional nat????

Packet-flow on ASA is irrespective of the nat type, so can you explain it a bit more??

Varun

[abhi-adte]

9just i want understand the difference on packet level (how traffic will transit from source to destination) ... if bi-directional my user initiate the traffic from out side then what happen it will drop or allow? if allow then how its enter in the network?

actully i got confusion because of Netscreen this boxes?

[Julio Carvajal · Accepted solution]

If the nat rule is bi-directional both end-point can innitiate the connection, if its uniderectional only the host on the higher security level can start the connection unless the nat statements its an outside nat.

Example of bi-directional:

Static (inside,outside) x.x.x.x y.y.y.y

Connection can be started on the outside, you will need an ACL as te connection will come from the lower security level.

Example of uniderectional.

nat (inside) 1 0 0

global (outside) 1 interface

Let me know if this helps.

Julio