We are running Cisco VPN 3030 on version 4.7.2.J. For some reason we see a lot of UDP datagrams to the internal broadcast address on port 137 and 138. This seems to be NetBIOS name and datagram service. We do not have any WINS servers and we want to block these broadcasts from flooding the local subnet (where no servers are available). We have defined a filter that drop all traffic to the internal broadcast address and applied it to the group where the users come in, but the packets still passing into the internal network.
Does anyone have any clues to how to solve this issue?
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...