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Home > Archive > CCNP > October 2001 > NAT Translations & Obituaries
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NAT Translations & Obituaries
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| firechicken 2001-10-26, 9:15 am |
| Hi all.
Scenario:
Say for example, I had ten inside address being overloaded onto four global addresses. However, only four of those inside addresses needed a translation at the time of my scenario (making it a one to one mapping).
If one of the four inside hosts made a connection to an outside source (FTP download for example), after the download was finished, would the outside source then be able to initiate a connection with the inside host?
Man I hope that made sense.
I would think the answer would be yes, as long as the translation had not expired in the NAT table(?).
If someone could help me out, I'd really appreciate it! TIA. | |
| depamo 2001-10-26, 9:54 am |
| Had to revise this a little. From the description, the scenario wants two way conversations. The only way to allow inside local systems to recieve sessions from the outside internet is to directly map these over to IP's inside. Because of this you cannot use a pool which would allow the 10 inside systems to use the 4 addresses as necessary so long as only 4 computers were talking at a time.
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The NAT Translation will exist for the term of the session. Once the session is torn down or the threashold timer for an inactive session is reached, the IP will go back to the pool.
Even though only you are using 4 IP's at a time, I don't think that you can guarantee what port will be used when overloading. If you don't care about running out of Global Outside IP's, you don't have to overload. As soon as an IP is available, it will allow traffic to pass from the inside addresses. |
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