Monday, June 4, 2012

Cisco - ASA : NAT

I always had a confusion about the NAT in ASA. Today I am going to make it very clear

static (inside, outside) 203.200.138.70 192.168.1.100 netmask 255.255.255.255

when traffic intiate from inside = the SOURCE will get NATTED. ie, 192.168.1.100 will become 203.200.138.70 in the souce column

and

when traffic intiate from outside = the DESTINATION will get NATTED. ie, 203.200.138.70 will become 192.168.1.100 in dst column

=========================================================================

static (outside, inside) 203.200.138.70 192.168.1.100 netmask 255.255.255.255

When traffic intiates from outside zone, souce nat will happen ie, 192.168.1.100 wil become 203.200.138.70 in SRC column

When traffic intiates from inside zone, DST nat will happen ie, 203.200.138.70 wil become 192.168.1.100 in DST column

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