By Barry Raveendran Greene

ISBN-10: 1587050412

ISBN-13: 9781587050411

A finished advisor to the easiest universal practices for web carrier providers

  • Learn the simplest universal practices for configuring routers on the net from specialists who helped construct the Internet
  • Gain particular suggestion via entire insurance of all Cisco routers and present types of Cisco IOS Software
  • Understand the Cisco IOS instruments necessary to construction and holding trustworthy networks
  • Increase your wisdom of community security
  • Learn tips to hinder difficulties and enhance functionality via distinctive configuration examples and diagrams

Cisco IOS software program documentation is wide and certain and is usually too not easy for lots of net carrier companies (ISPs) who easily are looking to turn on and get going. Cisco ISP Essentials highlights some of the key Cisco IOS good points in daily use within the significant ISP backbones of the realm to assist new community engineers achieve figuring out of the facility of Cisco IOS software program and the richness of gains to be had in particular for them. Cisco ISP Essentials additionally offers a close technical reference for the specialist ISP engineer, with descriptions of many of the knobs and unique gains which were particularly designed for ISPs. The configuration examples and diagrams describe many situations, starting from strong operational practices to community safety. eventually an entire appendix is devoted to utilizing the easiest ideas to hide the configuration element of every router in a small ISP element of Presence.

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Extra resources for Cisco ISP Essentials

Sample text

SNMP can be set up with more than one community, with a different access list. This is quite useful, say, if different groups in the company require different SNMP access to the router, or if a transit ISP offers SNMP read access to its ISP customers on its aggregation router. An example might look like the following: ! access-list access-list ! access-list access-list access-list ! 1 98 deny any community 5nmc02m RO 98 45 snmp-server community 1spxs RO 97 ! SNMP in Read-Write Mode If SNMP will be used in read-write mode, think very carefully about the configuration and why there is a requirement to do this.

For example, NAS 1, a Cisco 3640 with 96 built-in modems, would have a configuration highlighted in Example 1-2. PoP gateway routers Core 1 and Core 2 have two configuration options. First, each device in the PoP can be manually configured with an ntp peer command. Even though the peer commands open the gateway routers to have the capability to allow synchronization, the ntp server commands on the PoP devices will make this unlikely. Yet, there is always the chance of maintenance-induced trouble (MIT)— misconfiguration on the PoP gateway or on one of the PoP network devices.

1 access-list 98 deny any 44 ! snmp-server snmp-server snmp-server snmp-server snmp-server snmp-server snmp-server snmp-server snmp-server snmp-server snmp-server snmp-server ! 1 5nmc02m tftp-server-list 98 Note the application of access-list 98. The community string 5nmc02m is not encrypted, hence the need to use an access list to control access. This is too often forgotten, and if the community string is known outside the ISP, it can easily lead to the compromise of a router. In fact, some scripts available on the Internet allow script kiddies [3] to probe a router and crack the community name.

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Cisco ISP Essentials by Barry Raveendran Greene

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