i would like to understand how pinholing works on Cisco Firewalls. I am from teleresence background. We use SIP as a protocol to make video calls. i have read about problems which sip has traversing NAT. protocols like h460 17/18/19 are used to fix this issue. As per my understanding > any thing from private to public is allowed.
so suppose a user A Video endpoint dials user B Video End point on public internet. how will a pinhole for signaling and media will be created. Also what happnes if user B shares presentation and traffic comes from public to private network. how does a firewall takes care of that.
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...
[toc:faq]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 and UDP are I...