D-Link NetDefend DFL-210 User Manual page 176
Network security firewall ver. 1.05
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Also See for NetDefend DFL-210:
- User manual (495 pages) ,
- Log reference manual (476 pages) ,
- Cli reference manual (213 pages)
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7.1.1. Which Protocols can NAT
handle?
dresses, destination addresses and protocol numbers.
This means that:
•
An internal machine can communicate with several external servers using the same IP protocol.
•
An internal machine can communicate with several external servers using different IP protocols.
•
Several internal machines can communicate with different external server using the same IP pro-
tocol.
•
Several internal machines can communicate with the same server using different IP protocols.
•
Several internal machines can not communicate with the same external server using the same IP
protocol.
Some protocols, regardless of the method of transportation used, can cause problems during address
translation.
Note
These restrictions apply only to IP level protocols other than TCP, UDP and ICMP,
e.g. OSPF, L2TP, etc. They do not apply to "protocols" transported by TCP, UDP and
ICMP such as telnet, FTP, HTTP, SMTP, etc. NetDefendOS can alter port number in-
formation in the TCP and UDP headers to make each connection unique, even though
such connections have had their sender addresses translated to the same IP.
163
Chapter 7. Address Translation
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