PPT Slide
Front end in the firewall
Back end in the internal network
Communications limited (router)
Addresses are not translated
intermediate machines use other machines
Front-end back-end firewall systems
Router
Router
Gateway
Front
Front
Back
Request
Request
1
2
3
a.b.c.d
j.k.l.m
w.x.y.z
j.k.l.q
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