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Ibrahim Jamil
Frequent Contributor

src/dst IP and src/dst mac

Hi Experts

PC-1---------->SW1----------ASA-1----------R1---------CLOUD--------------R2----------ASA-2----------SW2---------SERVER1

Based on the above,How the source and destination IP address/source mac and Destination mac looks like  when PC-1 needs to talk to SERVER1

thanks

jamil

2 REPLIES 2
Alessio Andreoli
Contributor

Hi Jamil,

about the the src/dst MAC address you have probably read in everywhere how encapsulation and decapsulation of a frame works. On a per hope basis the MAC address is stripped off and replaced with a new one having the next hop mac address as dst MAC and the outbound interface as SRC MAC.  About the IP, you are missing to provide a lot of info. For example, there is NAT in the middle? Is there MPLS? R1 is connected to R2 via what:

-Virtual Circuit

-AToM

-VPLS

-ATM

-Frame Relay

- tunneling

- GRE or what else?

To describe a purely IPv4 path is not that difficult and possibly you know it mucch better than many here, but we are talking about a not-defined CLOUD in between two ASA that could even maskerade the IP!!

Too many things can happen between ASA1 and ASA2

Provide a more specific question and it will be easier to answer. I am not an expert as you can see

HTH

Alessio

Tharak Abraham
Participant

Jamil,

A simple answer would be, at every L3 lookup (routing out an interface) the MAC is changed no matter you have NAT or not

and the source and destination IP's would remain to be the same untill you have translation.

So what do you see at the Server ?