Re: Port scan shows udp port 67,68,138 open on Cisco 1605 IPFW
Could you please provide the config of the router as well as the output of a "show ip sockets". Have you had a look at this document: http://www.cisco.com/warp/public/707/21.html ?Exert: "If you have the output of a show running-configuration command from your Cisco device, you can use Output Interpreter to display potential issues
UDP Ports 67 and 68 are to do with DHCP
UDP Port 138 deals with Netbios over IP (Microsoft)
You need to be careful when you do port scans and make sure you're on the same network as the router. Where did you perform your scan in relation to your router? This *may* be a false representation from your port scanner.
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...