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All FAQs → Cisco Forum FAQ Table of Contents 10.0 General Questions (5) 20.0 Products and Services (10) 20.1 Smartnet (8) 20.2 IOS Image Management (5) 20.3 Tips and Tricks (14) 20.4 PIX/ASA Image Management (2) 20.5 Switch Image Management (3) 30.0 Technologies (22) 30.1 Quick subnet calculating techniques (4) 30.2 Between Router and Layer-3 Switch (5) 30.3 Switching Technology (4) 30.4 Routing Technology (10) 30.5 IP version 6 (1) 40.0 Security (12) 40.1 NAT/VPN/ACL/CBAC/Firewall (9) 40.2 Security Sample Configurations (14) 40.3 Security and VRF lite (2) 40.4 Switch Port Security (1) 50.0 Configuration (11) 50.1 PPPoE/PPPoA/DHCP (21) 50.2 UBR Cable Modem/Router (4) 50.3 Router-Firewall Combo (4) 50.4 Running Servers with Cisco (3) 50.5 Load Balance 2 ISP with Cisco (4) 50.6 Switch Configuration (3) 50.7 QoS and Voice over IP (16) 50.8 Wireless (7) 60.0 Troubleshooting (20) 60.1 Unexplained Phenomenon (4) 70.0 Cisco Learning: CCNA (10) 70.1 Cisco Learning: CCNP (1) 70.2 Cisco Learning: CCIE (1) 80.0 Network Design (12) 80.1 Network Best Practices (1) 90.0 FAQ Wish List (desired FAQs) Editors: skj , Covenant , aryoba , Phraxos Last modified on 2013-10-03 10:48:08 view:Revisions 10.0 General Questions What is the purpose of this forum? How This Forum Works How this FAQ works How do I post in the forum? How can I add to this FAQ? 20.0 Products and Services Why Cisco? Does the buying price justify? Choosing Cisco equipment as Internet gateway and learning tool Which Cisco solution is right for my situation? Cisco Equipment Performance (per pps and Mbps) Cisco Buying and Configuration Tips for Average Joe WIC-1ADSL and HWIC-1ADSL compatibility and performance What is a good router logging software package? Cisco equipment memory chip specification Where can I find Field notices to confirm to during troubleshooting? Which Cisco IOS version and/or device that offer specific features/technology? 20.1 Smartnet Does Cisco provide any support for non-registered customers? How/where do I get Cisco images (such as IOS, PIX/ASA OS)? What is Smartnet? Do I need one? Where can I purchase a SMARTNet contract or cheap Cisco product? What does the Cisco EULA say? Where are the Cisco SMARTnet Terms and Conditions What to expect from Cisco new product lines Unified Communication Licensing 20.2 IOS Image Management How to prepare TFTP server How do I upgrade a Cisco router IOS image or to backup to my computer? Deleted/Corrupted/Wrong Type/No IOS image and router won't boot How do I copy a 2600 IOS image to 16MB flash when the router says it won't fit? Troubleshooting Compact Flash card 20.3 Tips and Tricks Cisco CLI Handy Keys How do I remove a flash partition? Configure Cisco networking devices w/o knowledge of Cisco IOS® software Why should I remove the password 7 hash from my config before posting? Cisco router ROMMON commands I do not have a console cable! What can I do? What is the pin out for a T1 crossover cable? Unreadable output from Cisco Router Console Make Cisco router/switch fan noise softer GBIC types and interconnectivity Cisco Catalyst switch Static MAC address behaviors TCP Optimizing factors to maximize traffic flow EEM and TCL scripting Jumbo Frame and MTU 20.4 PIX/ASA Image Management PIX 520 Boothelper / PIX 520 Password Recovery Lost/Corrupted PIX Image, Boot from Monitor Prompt 20.5 Switch Image Management How do I upgrade an IOS tar file on a 2950 Catalyst switch? Deleted/Corrupted/Wrong Type/No image and switch won't boot Catalyst OS (Cat OS) Management 30.0 Technologies Things to expect when setup network for home or small business Technical Aspects in xDSL/Cable Internet connection Between DHCP, PPP, Dynamic, and Static IP Address Setting Up Private Site-To-Site Connections Basic Cisco Commands and Descriptions What are the various show commands? What features does my IOS support? How can I find out how far I am from the CO. Circuit Commission and Troubleshooting Introduction to Optical Network Engineering, application, and maintenance How your ISP annouce your subnet via BGP to the Internet: BGP Looking Glass Setting Up Wireless LAN VPN Concentrator 3000 series - Various Info Automatic Network Health Monitoring and Reporting System: An Introduction WAN Acceleration Network Management Software Understanding PIX Firewall/ASA Cisco ASA/PIX Firewall licenses and features Nexus 5000 and 2000 switches: What's new with NX-OS New Platform: Routers, Switches Between Catalyst 6500, Catalyst 6500E, and Nexus platforms Calculating need of initial Internet bandwidth 30.1 Quick subnet calculating techniques Quick and Easy Subnetting on Routing, Switching and Network Design Relationship Quick and Easy Subnetting /24 and larger network Quick and Easy Wildcard (Inverse) Subnet Mask ACLs and wildcard mask syntax 30.2 Between Router and Layer-3 Switch Routing and Switching - An Introduction What is the difference between a Layer-3 switch and a router? Should I use Layer-3 switch or router? Layer-3 Switch recommendation Various Network Design using Routers, Layer-3 Switches, and more 30.3 Switching Technology How A Layer-2 LAN Communication Works Spanning Tree Protocols: An Overview BPDU, Access port, Trunk port, and Port Channel Jumbo Frames 30.4 Routing Technology How A Layer-3 Network Communication Works Choosing Gateway IP Address for a network What is the difference between the different gateways in the routing table? Static Routing RIP: An Introduction EIGRP: An Introduction OSPF: An Introduction BGP: An Introduction Multicast - Introduction and Sample Configurations DHCP Broadcast 30.5 IP version 6 General Info and Introduction 40.0 Security How do I secure a Cisco router from the Internet? Protect my network! How do I do that using Cisco IOS? Secure and Monitor Network Access with AAA (TACACS/RADIUS) and Privilege Level Are there Free TACACS+ or RADIUS authentication software to secure my router? Securing access to routers with AAA commands Securing access to switches with AAA commands Securing access to ASA/PIX Firewall with AAA commands Between GRE/IPSEC and IPSEC VPN tunnels Securely remote connect to router, firewall, or any device over any network WCCP with Router/MSFC and Blue Coat ProxySG Cisco Ironport as Anti Virus, Anti Spam, and Secure Email SSL Certificates 40.1 NAT/VPN/ACL/CBAC/Firewall NAT, PAT, Port Forward, Internet and Server Access: Introduction and Practices Generic NAT configuration (RFC 1631) Minimum and Maximum NAT Timeouts How do I NAT a TCP port range without entering a seperate NAT for each port? How can I insert a line into an existing ACL or modify existing ACL in general? Working with invalid network design or poor network implementation Policy NAT Considerations of using non-RFC-1918 IP address for internal network IDS/IPS Solutions 40.2 Security Sample Configurations Basic Internet Firewall for Routers without IOS image Firewall feature Configure DMZ on routers Sample IOS Firewall (CBAC) router configuration Sample Configuration of ACL-CBAC-IDS/IPS-IPSec VPN on router Zone-Based Firewall Sample Configuration Internet access restriction without a proxy server/websense solution? Restrict Traffic Flow including P2P (Peer to Peer) using NBAR: An Overview Various Site-to-Site IPSec VPN: Cisco, Juniper, Checkpoint, Sonicwall, Zywall How do I configure a Zywall/PIX IPSec VPN Private Routing over VPN: NAT/PAT, GRE, IPSec Sample Configurations Configure router and ASA/PIX Firewall to support various VPN technologies Configure router as both Internet router and VPN Concentrator Configure PIX/ASA as both Internet Firewall and VPN Concentrator Configuring Juniper SRX as Internet Firewall and IPSec VPN Concentrator 40.3 Security and VRF lite Multiple networks share same Internet lines or same devices transparently VRF-aware IPSec VPN tunnel 40.4 Switch Port Security Design and Configure Port Security 50.0 Configuration The best way to configure Cisco equipments Is there a graphical interface for configuration and where do I get it? The most straight-forward way to configure Cisco router: Introduction to CLI 2500 Series Installation and Configuration Guide Where can I find documentation for configuring my Cisco 67x series DSL Router Dynamic DNS (DDNS) Sample Configuration and Discussions Straight-forward way to configure Cisco PIX Firewall/ASA: Introduction to CLI Basic Configuration of Cisco devices Configuring ASA/PIX Firewall to support Riverbed Steelhead passthrough Setting Up DHCP server for LAN in Cisco network Basic Idea of setting Internet connectivity for IP network 50.1 PPPoE/PPPoA/DHCP Be Broadband / O2 Config for ADSL2+ (992.3 Annex A) Sample Configuration on Real Network Configure router as DHCP client using external modem Configure router with integrated ADSL modem as DHCP client Configure ASA/PIX Firewall as DHCP client using external modem Quick Guide of Configuring Cisco router for PPPoE using external modem Walkthrough of Configuring Cisco Routers for ADSL PPPoE using external modem 678 ADSL External Modem/Router 678 on MSN DSL Configuring router with integrated ADSL modem running PPPoE Configure ASA/PIX Firewall as PPPoE client using external modem ADSL router configuration for PPPoA/PPPoE with NAT ADSL Router Sample Configuration running GRE Configuring router with integrated ADSL modem running PPPoA Generic PPPoA configuration w/ dynamic address Generic PPPoA/PPPoE/RFC1483 Bridging/RFC1483 Routing Guide Generic PPPoE configuration How can I configure broadband router with cable/dsl using static IP address Configure ASA/PIX Firewall using static IP address from ISP Setting Up Network With ISP WAN and Public IP Block subnets running NAT Integrated VDSL modem/router Sample Configuration 50.2 UBR Cable Modem/Router UBR9xx Cable Router Default Configuration uBR9xx - Can I reset the MAC address? uBR924 configuration uBR925 configuration 50.3 Router-Firewall Combo Setting Up Network With Router and Firewall Internet - Router - PIX/ASA - LAN Internet - PIX/ASA - Router - LAN Separate ISP: One is for Internet and one is for VPN 50.4 Running Servers with Cisco Router configuration to run server (with and without port forwarding) PIX Firewall/ASA configuration to run server (with and without port forwarding) Separate Internet: Dedicate T1/E1 for server, dedicate DSL/Cable for LAN 50.5 Load Balance 2 ISP with Cisco Dedicate one ISP between two by the destination TCP/UDP port number OER on Routers (without BGP; just static routes) IP SLA Load Balance - Sample Configuration and Workaround Redundant Link Graceful Internet Load Balance/Failover 50.6 Switch Configuration Switch and VLAN Management Best Practice Etherchannel Sample Configuration: Nexus 5000 and Nexus 2000 with FEX 50.7 QoS and Voice over IP Deploying VoIP - An Introduction Introduction to Voice over IP Working with Voice over IP protocols QoS Basic and Implementation How do I configure QoS for VoIP? Improving Performance of Cable/DSL Internet using QoS Router runs VoIP, Bit Torrent, Online Gaming; DynDNS - QoS Sample Configuration Cisco References Hold Queue interface value to speed things up Troubleshooting QoS Call Manager Express (CME) Sample Configuration sep(mac-address).cnf.xml for Cisco 79xx phones running SIP CRS Scripting Various Voice Gateway Router Sample Configurations MGCP (Media Gateway Control Protocol) Configuration Guide Telepresence: An Introduction 50.8 Wireless Considerations in building a Wireless network Wireless Router Sample Configuration Various sample configuration using Wireless as backbone network Creating multiple wireless networks: configuring AP to trunk to switch Upgrading the CISCO AIRONET MODEL AIR-AP-1220B-x-K9 VXWorks OS to IOS Cisco AP with authentication server Manage Wireless LAN Controller 60.0 Troubleshooting Corrupt image & router boots into rommon mode Switch does not boot properly Router Various Hardware Issues and Solutions ASA/PIX Firewall Various Hardware Issues and Solutions Switch Various Hardware Issues and Solutions Config Register Value - router lost configuration Used wrong config-register and now the router does not boot! Password Recovery Procedures - proper BREAK key sending Unreadable console output PPPoE: Problems with resolving DNS and general connectivity. Its your MTU! The Cisco Router Web Interface (= CRWS) hangs when I try to start it My SDM/CRWS (web configuration mode) doen't work. How do I revive it? KVM Switch: My router boots fine, but then doesn't respond. IPSec VPN and Microsoft - Remote user receives IP address, unable to map drives Server Load Balancing Getting around Layer-1/2 line error troubleshooting Basic Troubleshooting for Speed Issues with Cisco Equipment Slow connection through a router, firewall, or switch Checking traffic activities against ACL Cisco links to interpret error messages, bug finding, and command lookups 60.1 Unexplained Phenomenon Frame Relay Router IOS image performance and reliability Application vs. Network Hardware Issue IOS/Firmware Issue 70.0 Cisco Learning: CCNA Preparing for exam and for real world Where can I find useful Cisco links, other than official Cisco website? Where can I get books about Cisco products and technologies? Where is the Cisco Univercd documentation? Good Cisco equipment for CCNA Learning What to expect when using a 2514 as a broadband router or Cisco learning tool. Equipments and books needed for CCNA preparations Accessing Lab from Network Questions around CCNA Exam taking CCNA Studies 70.1 Cisco Learning: CCNP CCNP Routing and Switching 70.2 Cisco Learning: CCIE CCIE Lab Exam Preparations 80.0 Network Design Improving Small Business network performance Network Design Tips Running Out Of IP Addresses due to 'flat network' design Tips in Designing Network on Hub-and-Spoke, Full-Mesh, or Partially-Mesh setup Tips in connecting hosts to switches Resilient Network Tips for Small Businesses BGP Design Migrating network MPLS and VRF EIGRP Tips and Tricks Public Internet Datacenter Design Building Data Center for Small and Medium businesses 80.1 Network Best Practices Change Management - ITIL 90.0 FAQ Wish List (desired FAQs) login and you can contribute to the FAQ

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