is there a command that i can do on this router to see if a particular port is open? We have a PPP connection and just want to make sure that a particular application that we use at a remote location is able to come in thru a particular port.
But the other thing is that I assume that if it is PPP connection, that all ports are open. Am I right or am I right? Thanks for the help.
Do you mean a port opened that allows traffic through the router ?
If so then unless you have an access-list applied to an interface that denies certain ports by default a router will allow all traffic through so the easiest way is to do a "sh run" and under the interface statements check if there is an
"ip access-group "no/name" in or out
If there is then you need to look at the corresponding access-list so for example
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...