 PapaDosCum Grano SalisPremium,MVM
join:2001-02-08
Lasalle, QC
kudos:2 | reply to Bill_MI
Re: BEFSR41 Port Forwarding Bug Found Thanks for the good work Bill !
I recognize this is a problem.
My question is, is it a bug or the normal behavior for PAT ?
You should post a link to this thread in the other routers forums, and see if the same is true for them.
Note: Do you know the RFC number for PAT definition ?
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Nunc est bibendum... |
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 Bill_MIBill In MichiganPremium,MVM
join:2001-01-03
Royal Oak, MI
kudos:1
 ·Comcast
·WOW Internet and..
| Hi PapaDos,
Great idea to see how other products handle this.
The "NAT" RFCs I've referenced before are below. "PAT" is elusive... am I missing something? I assume that's Port-Address-Translation. The concept we know as "Port Forwarding" is not covered much in these NAT docs but maybe I have the wrong ones.
RFCs rarely go into detailed design but stay at the concept levels. I suspect priorities of an NAT extension like "Port Forwarding" is up to the common sense of the designer. What think?
RFC2663 IP Network Address Translator (NAT) Terminology and Considerations. P. Srisuresh, M. Holdrege. August 1999. (Format: TXT=72265 bytes) (Status: INFORMATIONAL)
RFC3022 Traditional IP Network Address Translator (Traditional NAT). P. Srisuresh, K. Egevang. January 2001. (Format: TXT=37675 bytes) (Obsoletes RFC1631) (Status: INFORMATIONAL)
RFC3027 Protocol Complications with the IP Network Address Translator. M. Holdrege, P. Srisuresh. January 2001. (Format: TXT=48662 bytes) (Status: INFORMATIONAL) |
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PapaDosCum Grano SalisPremium,MVM
join:2001-02-08
Lasalle, QC
kudos:2 | PAT stands for Port Address Translation.
All the "port forwarding" features of the low cost routers are based on PAT.
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Nunc est bibendum... |
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Bill_MIBill In MichiganPremium,MVM
join:2001-01-03
Royal Oak, MI
kudos:1 Reviews:
·Comcast
·WOW Internet and..
| said by PapaDos:
PAT stands for Port Address Translation.
All the "port forwarding" features of the low cost routers are based on PAT.
In terms of a spec it appears as elusive as "SPI" - is it one of those things a marketeer could love because it's virtually undefined?  Perhaps one company coined the term?
By the way, I found this while looking at something else...
QUESTION: What happens if 2 LAN machines connect to the same host/site with the same source port?
ANSWER: The LinkSys shifts the source port on the WAN transparent to the 2 LAN machines to keep them separated.
Interesting - THAT case is covered quite well . |
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PapaDosCum Grano SalisPremium,MVM
join:2001-02-08
Lasalle, QC
kudos:2 | The "real" name of PAT is NAPT (Network Address Port translation).
It is mentioned in RFC 2663.
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Nunc est bibendum... |
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