Wireshark DisplayFilters

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DisplayFilters Wireshark uses display filters for general packet filtering while viewing and for its ColoringRules. The basics and the syntax of the display filters are described in the User’s Guide. The master list of display filter protocol fields can be found in the display filter reference. If you need a display filter for a specific protocol, have a look for it at the ProtocolReference. Examples Show only SMTP (port 25) and ICMP traffic: tcp.port eq…

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Understanding Active Directory for Beginners – Part 1

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Understanding Active Directory for Beginners – Part 1 Active Directory History of Directory Service Advantage of LDAP Back to Active Directory Naming conventions Requirement of DNS AD objects AD Database Schema Domain, Tree and Forest What’s a directory service? A directory service is a container that provides a hierarchical structure and allows to store objects for quick and easy access and manipulation. A directory service is like an electronic phone directory that lets you search…

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Collecting a packet capture from a Cisco IP Phone

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Collecting a packet capture from a Cisco IP Phone Introduction. For troubleshooting purposes one may need to gather a packet (sniffer) capture from an IP Phone. There are many ways this can be accomplished.   This article describes how to collect the capture using the IP Phone’s built in PC ports.  It can be enabled to copy all traffic entering into the SWITCH port, and send it to the PC port.  From there, the data can…

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Cisco UBE Support for SRTP-RTP Internetworking

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  Cisco UBE Support for SRTP-RTP Internetworking CUBE Support for SRTP-RTP Internetworking The Cisco Unified Border Element Support for SRTP-RTP Internetworking feature connects SRTP Cisco Unified CallManager domains with the following: RTP Cisco Unified CallManager domains. Domains that do not support SRTP or have not been configured for SRTP, as shown in the figure below. RTP Cisco applications or servers. For example, Cisco Unified MeetingPlace, Cisco WebEx, or Cisco Unity, which do not support SRTP,…

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Posted in CME

Configuring a Cisco Unity Connection Cluster

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Configuring a Cisco Unity Connection Cluster Task List for Configuring a Cisco Unity Connection Cluster Configuring the Cisco Unity Connection Cluster Setting Up Alert Notification of Server Status Changes in Cisco Unity Connection Customizing Cluster Settings in Connection Task List for Configuring a Cisco Unity Connection Cluster Caution Configure a Cisco Unity Connection cluster only after you have installed the publisher server and set up administrator workstations according to instructions in the Installation Guide for…

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Cisco NX-OS/IOS Netflow Comparison

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Cisco NX-OS/IOS Netflow Comparison Objective This tech note outlines the main differences in NetFlow between Cisco® NX-OS Software and Catalyst 6500 Sup720/Sup32 running Cisco IOS® Software. Sample configurations are included for Cisco NX-OS and Cisco IOS Software for some common features to demonstrate the similarities and differences. Please refer to the NX-OS documentation on Cisco.com for a complete list of supported features. It should be noted that the Catalyst 6500 range now ships a new…

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Routing over Nexus 7000 vPC peer-link? Yes and No.

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This is a Nexus 7000 design question that comes up from time to time: In a Nexus 7000 Vpc environment, how can I form a layer 3 adjency between the two switches. Lets say I want to run OSPF and want to create two SVIs on the two switches connected via Vpc, Will the neighborship relation be formed over the Vpc Peer link or is the peer link only designed for control traffic for Vpc….

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How to Calculate TCP throughput for long distance WAN links

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So you just lit up your new high-speed link between Data Centers but are unpleasantly surprised to see relatively slow file transfers across this high speed, long distance link — Bummer! Before you call Cisco TAC and start trouble shooting your network, do a quick calculation of what you should realistically expect in terms of TCP throughput from a one host to another over this long distance link. When using TCP to transfer data the…

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Cisco UCS B-Series NIC Teaming & Bonding OS Support Matrices

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Cisco UCS B-Series NIC Teaming & Bonding OS Support Matrices An unsupported teaming type for the Cisco UCS B200 blade server. Their discussion made me realize that there wasn’t an easy-to-find resource for Cisco UCS customers that needed to know “OS Team Types Supported Per UCS Network Adapter” and “Unsupported Team Types”. Below you will find both of these resources. I’ve listed a chart per Cisco UCS B-Series Network Adapter that shows the teaming/bonding types that…

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Distributed virtual and physical routing in VMware NSX for vSphere

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Distributed virtual and physical routing in VMware NSX for vSphere This post is intended to be a primer on the distributed routing in VMware NSX for vSphere, using a basic scenario of L3 forwarding between both virtual and physical subnets. I’m not going to bore you with all of the laborious details, just the stuff that matters for the purpose of this discussion. In VMware NSX for vSphere there are two different types of NSX routers you can deploy in your virtual network. The NSX Edge Services Router (ESR) The…

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