WatchGuard Technologies SOHO - Manual (Page 99)

User Guide 5.0 99
What you will need
IP Address Table (example):
Item Description Assigned By
External IP
Address
The IP address that identifies the SOHO to the Internet. ISP
Site A: 207.168.55.2
Site B: 68.130.44.15
External
Subnet Mask
The overlay of bits that determines which part of the IP
address identifies your network. For example, a Class C
address licenses 256 addresses and has a netmask of
255.255.255.0.
ISP
Site A: 255.255.255.0
Site B: 255.255.255.0
Local Network
Address
A private network address used by an organization’s local
network for identifying itself within the network. A local
network address cannot be used as a external IP address.
WatchGuard recommends using an address from one of the
reserved ranges:
10.0.0.0 — 255.0.0.0
172.16.0.0 — 255.240.0.0
192.168.0.0/16 — 255.255.0.0
You
Site A: 255.255.255.0
Site B: 255.255.255.0
Shared Secret A phrase stored at both ends of the tunnel to authenticate
the transmission as being from the claimed origin. The
secret can be any phrase, but mixing numerical, special,
alphabetical, and uppercase characters improves security.
For example, “Gu4c4mo!3” is better than “guacamole”
You
Site A: OurLittleSecret
Site B: OurLittleSecret
Encryption
Method
Encryption method determines the length in bits of the key
used to encrypt and decrypt communication packets. DES is
a 56-bit encryption; 3DES is 168-bit, and therefore much
more secure. It is also slower. Either 3DES or DES may be
selected as long as both sides use the same method.
You
Site A: 3DES
Site B: 3DES
Authentication Both sides must use the same method. You
Site A: MD5
Site B: MD5