Output "show cgn nat44 xxx statistics"

[H_Barreto]

RP/0/RP0/CPU0:xxxxx#sh cgn nat44 xxxx statistics

Statistics summary of NAT44 instance: 'xxxx'

Number of active translations: 123001

Number of sessions: 26223

Translations create rate: 417

Translations delete rate: 697

Inside to outside forward rate: 16471

Outside to inside forward rate: 22416

Inside to outside drops port limit exceeded: 1677901

Inside to outside drops system limit reached: 0

Inside to outside drops resource depletion: 0

No translation entry drops: 2024975

PPTP active tunnels: 7

PPTP active channels: 5

PPTP ctrl message drops: 291

Number of subscribers: 17068

Drops due to session db limit exceeded: 0

What is the diference between sessions and subscribers?

[kvarlamo]

Cisco documentation doesn't directly describe this terminology.

I believe, this terminology disclosed well in IETF standards and drafts

http://tools.ietf.org/html/draft-ietf-behave-lsn-requirements-04

- subscriber represents a set of active 'private' addresses (but because in some scenarios internal addresses may overlap - CGN uses another term - subscriber)

- session represents consumed 'public' address space. Public space divided into port bulks and leased to subscribers on bulk basis. One bulk represents a consequent ports. If subscriber's translations utilize more ports that bulk has, one more bulk gets leased for subscriber. This can lead to mapping a number of port bulks to a single subscriber.