Why is it okay for an external ip address to be seen but not internal?

Deja Q

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Tue Oct-18-05 07:22 PM
Original message

Why is it okay for an external ip address to be seen but not internal?

:shrug:

Thx!

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bemildred

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Tue Oct-18-05 09:02 PM
Response to Original message

1. External IPs have to be seen so packets can be sent to them.

Edited on Tue Oct-18-05 09:04 PM by bemildred

That's the public address that everybody knows about.

Internal IPs are private, allocated from reserved address
ranges for that purpose, and thousands of machines may have
those same addresses (on their internal private nets).

Among other things, for example, reverse DNS lookups for
reserved range IPs will (should) fail.

http://www.faqs.org/docs/linux_network/x-087-2-issues.ip-addresses.html

Table 2-1. IP Address Ranges Reserved for Private Use
Class Networks
A 10.0.0.0 through 10.255.255.255
B 172.16.0.0 through 172.31.0.0
C 192.168.0.0 through 192.168.255.0

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