Cisco Cisco Expressway
6
Administration: Cisco Expressway-E
Expressway-E
source port
Server
listening port
Management control
DMZ to public
Open firewall
DMZ to public
IP address
IP address of
Expressway-E
IP address of DNS
Server
IP Po
rt
s
DNS
UDP S
>= 1024
UDP 53
53
S = Source port , typically >= 1024
Internet
Expressway-C
Expressway-E
DMZ