Port Forwarding

Report
Router Configuration for Home Security:
Forward your Ports
Presenter: Steve Harris
SCTE Director Advanced Network
Technologies Program Development
LINK
© 2011 by the SCTE
Router Configuration for Home Security
2
Agenda
• Describe the relationship of TCP/IP and TCP
and UDP ports
• Explain the role and function of a NAT enabled
GWR in the customer premises network
• Demonstrate the configuration of an IP
surveillance camera and port forwarding
© 2011 by the SCTE
Router Configuration for Home Security
3
Introduction
21
23
80
Why?
WAN IP
98.225.216.185
Internet
Laptop
Smartphone
Fax
HDTV / 3DTV
eMTA
STB /
DVR / PVR
Wireless
GWR
remote devices
Printer
Desktop
PC
Cordless
Analog Phone
LAN IP
192.168.1.x/24
© 2011 by the SCTE
Router Configuration for Home Security
5
What is TCP/IP?
© 2011 by the SCTE
Router Configuration for Home Security
6
TCP/IP
• Ubiquitous
Communication
Protocol
• Suite of protocols
(65,535)
• Client / Server
model
© 2011 by the SCTE
Internet
Cable
Operator
Router Configuration for Home Security
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TCP/IP
• Internet devices have at least one IP address
– e.g., 192.168.1.120
• TCP/IP defined 216 ports (65,535) per IP
address
• Devices send data using port number from
source to destination
© 2011 by the SCTE
Router Configuration for Home Security
8
What is a port (socket)?
• TCP/IP uses an abstract destination point called a
protocol port.
• Ports are identified by a positive integer value, e.g. 80.
• Operating Systems provide some mechanism that
processes use to specify a port.
TCP/IP
© 2011 by the SCTE
53
DNS port
443
SSL port
80
HTTP port
CM/eMTA
GWR
Router Configuration for Home Security
9
Port Numbers
http://www.iana.org/assignments/port-numbers
0 = no port has
been allocated
Well-known ports 0 – 1023
HTTP, FTP, SSL, Telnet, SSH, DNS, etc…
Registered ports or
vendor-specific applications
1024 to 49,151
Dynamically or Private Ports
49,152 to 65535
© 2011 by the SCTE
Router Configuration for Home Security
10
Port Names
DNS = 53
HTTP = 80
© 2011 by the SCTE
Router Configuration for Home Security
11
What is the OSI model?
© 2011 by the SCTE
Router Configuration for Home Security
12
Network Model
Layers
DATA
TCP
UDP
Port Numbers
IPv4/6
ICMP
Protocol Numbers
DOCSIS/ PacketCable™
RF
© 2011 by the SCTE
Router Configuration for Home Security
13
User Datagram Protocol
• Connectionless
• Unreliable
• Datagram
Delivery
• Video traffic
© 2011 by the SCTE
Source Port
Destination Port
Length
Checksum
Data
Router Configuration for Home Security
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Transmission Control Protocol
• Connectionoriented
• Reliable
• Full-duplex
• Byte-Stream
• Voice & data
traffic
© 2011 by the SCTE
Source Port
Destination Port
Sequence Number
Acknowledgement Number
offset Reser.
TCP Flags
Window
Checksum
Urgent Pointer
TCP Options (if any)
Data
Router Configuration for Home Security
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Common Ports
http://www.iana.org/assignments/port-numbers
80
22
Application
Layer
Transport
Layer
© 2011 by the SCTE
80
Internet
22
F
T
P
T
e
l
n
e
t
21
23
S
S
H
S
M
T
P
D
N
S
H
T
T
P
22
25
53
80
TCP
N
E
T
B
I
O
S
S
N
M
P
H
T
T
P
S
137139
161
443
UDP
Router Configuration for Home Security
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Network Address Translation
Port Address Translation
21
23
80
What is NAT & PAT?
© 2011 by the SCTE
Router Configuration for Home Security
18
NAT
public
private side
192.168.1.123
68.10.0.171#29225
192.168.1.125
Remote PC
CM
Internet
192.168.1.1
192.168.1.123
iPad2
192.168.1.124
scte.org
Inside
© 2011 by the SCTE
Inside Local IP
Address
192.168.1.123
192.168.1.124
192.168.1.125
Inside Global IP
Address
68.10.0.171#29225
68.10.0.171#29226
68.10.0.171#29227
Router Configuration for Home Security
Outside
19
NAT
© 2011 by the SCTE
Router Configuration for Home Security
20
Example
21
23
80
Connect Surveillance Camera
LAN IP
192.168.1.x/24
1.120
1.1
eMTA
GWR
1.121
© 2011 by the SCTE
Router Configuration for Home Security
22
Connect Surveillance Camera
http://192.168.1.120
LAN IP
192.168.1.x/24
1.1
eMTA
Wireless Setup Page
GWR
1.121
© 2011 by the SCTE
Router Configuration for Home Security
23
DHCP Client Table
© 2011 by the SCTE
Router Configuration for Home Security
24
Wireless Setup
XXXXXXX
© 2011 by the SCTE
Router Configuration for Home Security
25
Surveillance Camera is Wireless
http://192.168.1.120
LAN IP
192.168.1.x/24
1.1
eMTA
Wireless Setup Page
GWR
1.121
© 2011 by the SCTE
Router Configuration for Home Security
26
DHCP or Static?
© 2011 by the SCTE
Router Configuration for Home Security
27
GWR Config
http://192.168.1.1
1.1
LAN IP
192.168.1.x/24
eMTA
GWR Config
GWR
1.121
© 2011 by the SCTE
Router Configuration for Home Security
28
Port Forwarding
© 2011 by the SCTE
Router Configuration for Home Security
29
Port Range Forwarding
© 2011 by the SCTE
Router Configuration for Home Security
30
Port Triggering
Port triggering is a configuration option on a
GWR with NAT to allows a host to dynamically
and automatically forward a specific port back
to itself.
© 2011 by the SCTE
Router Configuration for Home Security
31
What the inside global IP
(outside)?
http://www.ipchicken.com
© 2011 by the SCTE
Router Configuration for Home Security
32
Let’s test it!
Laptop
Smartphone
Fax
HDTV / 3DTV
eMTA
Broadband Connection
Wireless
GWR
STB / DVR / PVR
Printer
Cordless
Analog Phone
Desktop
PC
SMC
Port 10
TCP / UDP
10.1.10.2 to 10.1.10.9 are static local inside IP address
© 2011 by the SCTE
Router Configuration for Home Security
34
NETGEAR
© 2011 by the SCTE
Router Configuration for Home Security
35
You try
Camera 1
8085
1024
140
Camera 2
8086
1025
141
Camera 3
8087
1026
142
192.168.1.1
98.24.56.15
.140
.141
Internet
http://98.24.56.15:8085
http://98.24.56.15:8086
.142
© 2011 by the SCTE
http://98.24.56.15:8087
Router Configuration for Home Security
36
Summary
• Described the relationship of TCP/IP and TCP
and UDP ports
• Explained the role and function of a NAT
enabled GWR in the customer premises
network
• Demonstrated the configuration of an IP
surveillance camera and port forwarding
© 2011 by the SCTE
Router Configuration for Home Security
37

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