Packet Tracer

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Cisco Packet Tracer is a teaching tool used in the Cisco Networking Academy to simulate networks. It is full-featured and includes Cisco IOS simulation for routers and switches, Linksys GUI simulation for Linksys routers/APs, etc. The current stable version is 5.1.

packet-tracer is also known on the ASA to simulate packets travelling across an interface:

fw2# packet-tracer input inside tcp 10.2.0.50 32424 10.1.0.50 80

Phase: 1
Type: FLOW-LOOKUP
Subtype:
Result: ALLOW
Config:
Additional Information:
Found no matching flow, creating a new flow

Phase: 2
Type: ROUTE-LOOKUP
Subtype: input
Result: ALLOW
Config:
Additional Information:
in   0.0.0.0         0.0.0.0         outside

Phase: 3
Type: ACCESS-LIST
Subtype: log
Result: ALLOW
Config:
access-group Inside-IN in interface inside
access-list Inside-IN extended permit ip 10.0.0.0 255.0.0.0 any
Additional Information:

Phase: 4
Type: IP-OPTIONS
Subtype:
Result: ALLOW
Config:
Additional Information:

Phase: 5
Type: NAT-EXEMPT
Subtype:
Result: ALLOW
Config:
nat (inside) 0 access-list nonat
  match ip inside 10.2.0.0 255.255.255.0 outside 10.1.0.0 255.255.255.0
    NAT exempt
    translate_hits = 3, untranslate_hits = 110
Additional Information:

Phase: 6
Type: IP-OPTIONS
Subtype:
Result: ALLOW
Config:
Additional Information:

Phase: 7
Type: FLOW-CREATION
Subtype:
Result: ALLOW
Config:
Additional Information:
New flow created with id 143, packet dispatched to next module

Phase: 8
Type: ROUTE-LOOKUP
Subtype: output and adjacency
Result: ALLOW
Config:
Additional Information:
found next-hop 2.0.0.1 using egress ifc outside
adjacency Active
next-hop mac address cc02.3840.0010 hits 599

Result:
input-interface: inside
input-status: up
input-line-status: up
output-interface: outside
output-status: up
output-line-status: up
Action: allow