Celestix MSA 5000 Series Manuale Utente Scaricare il pdf (Pagina 10)

ISA Server

ISA Server

’

’

s View Of A Packet

s View Of A Packet





Packet headers and application content are inspected

Packet headers and application content are inspected

Application Layer Content

Application Layer Content

<html><head><meta http-

quiv="content-type"

content="text/html; charset=UTF-

8"><title>MSNBC - MSNBC Front

Page</title><link rel="stylesheet"

IP

IP

Header

Header

Source Address,

Dest. Address,

TTL,

Checksum

TCP

TCP

Header

Header

Sequence Number

Source Port,

Destination Port,

Checksum





Forwarding decisions based on content

Forwarding decisions based on content

¾

¾

Only legitimate and allowed traffic is processed

Only legitimate and allowed traffic is processed

Internet

Expected HTTP Traffic

Unexpected HTTP Traffic

Attacks

Non-HTTP Traffic

Corporate

Network

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