Table 1. Middlebox deployment in
a large enterprise environment [13]
Appliance Type
Number
Firewalls
166
NIDS
127
Conferencing/Media Gateways
110
Load Balancers
67
Proxy Caches
66
VPN devices
45
WAN optimizers
44
Voice Gateways
11
Middleboxes total
636
Routers
~ 900