Interface overruns, no buffer and underruns often show that the firewall cannot process all the traffic it is receiving on its NIC. Overruns and no buffers indicate that input traffic is too much on a given interface. The interface maintains a receive ring where packets are stored before they are processed by the ASA. If the NIC is receiving traffic faster than the ASA can pull them off the receive ring, the packet will be dropped and either the no buffer or overrun counter will increment.
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...