Re: What is NAT?

David Schwartz <davids@xxxxxxxxxxxxx> writes:

On Jul 23, 4:56 am, Randy Yates <ya...@xxxxxxxx> wrote:
Can someone please (without asking me to Google) explain simply and
plainly what NAT is?

Is it, basically, the mechanism that my router uses to forward TCP or
UDP packets that come in to my router from the ISP to a specific machine
on my internal network (and vice-versa)?

My son knew, from before the age of seven, that you don't ask someone
what the definition of a word is while a dictionary is sitting right
there on your table. What the hell is wrong with you?

My complete Oxford English Dictionary--the largest and most complete
dictionary of the english language-- has no such definition.
Are you sure that your advice is worth a pile of dead gnats?

Anyway to answer the original question, NAT is an acronym for Network
Address Translation-- the router takes a packet from your machine with its
internal address ( say 192.168.0.2, port number 80) and translates it to
the address of the router itself ( 142.56.98.7) with a high port number (
way 3080) and remembers that that port is associated with port 80 on
192.168.0.2.

t is a way of having the router with its external address pretend to be any
one of the machines on the inside network.

DS

.

Relevant Pages

  • RE: cant access others computer anymore
    ... Lots of Access Point has Router function and may have build-in NAT support. ... only HTTP package from port 80) ... | When implementing a wireless solution you usually buy an ADSL ...
    (microsoft.public.windowsxp.general)
  • Re: How did they get past my NAT?
    ... network), I get no response, because there is no "Default host" set up ... behind my NAT, and no port forwarding for that port - if an explicit ... as I understand?), and not forwarded on the router, so there should be ...
    (comp.security.firewalls)
  • Re: Port Filtering - Got it & Follow-up
    ... The key is that basic NAT built into a c/d router will stop ... Since your router does have port filters however, ... You can add additional packet filters to keep someone from using ...
    (comp.security.firewalls)
  • Re: NAT is not a mechanism for securing a network.. but.. HELP!
    ... >> Well the firmware for the 11S4 router has no FW like software like ... >> SPI so it wasn't and is not doing packet inspection. ... >> article Watchguard put out awhile back about how NAT routers can be ... > device opens a port by putting it in the NAT table, ...
    (comp.security.firewalls)
  • Re: LinkSys BEFSX41 Questions
    ... One of the big problems with how NAT is implemented on many of these routers ... holes because the router isn't dropping syn packets on ports used with NAT ... The problem is with the port assignment. ... So you can port forward the entire range of high ports for UDP, ...
    (comp.security.firewalls)