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Can someone explain the "extendable" keyword

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techseek

techseek

MIS
Nov 5, 2010
97
US
Hello
I know very little about routers/config.
I obtained a printout of our cisco 1700 config from our isp.
The reason being that we are planning an exch03 to exch10 move (transition).
I expected to see config lines relating to smtp etc. All i see is this line

ip nat inside source static 192.168.31.150 205.x.x.x (<-our mail server) extendable

If no protocol is specified on a static mapping, should I assume that all are being allowed?

thank you all
 
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