By Wayne Lawson
More and more businesses are designing and imposing distant entry Networks, which enable clients who're no longer bodily hooked up to a large region community (WAN) or neighborhood zone community (LAN) to entry the network's servers, purposes and databases or to take part in video conferencing and convention calls. the facility for a distant person to operate as though they have been within the subsequent workplace dramatically improves total potency whereas lowering overall rate of possession. Cisco platforms, the world's greatest internetworking seller, is the pioneer of the allowing applied sciences for distant entry Networks. This booklet will determine and clarify all the Cisco items worthwhile for designing and construction a distant entry community and integrating it with legacy structures. This booklet is a qualified reference detailing all the concepts, strategies and strategies for designing, configuring and keeping Cisco distant entry Networks. it's going to comprise thorough discussions of all Cisco entry Servers and routers. * call for for info on distant entry networks is starting to be quick at company and administrator point * Cisco distant entry networks entice companies as they supply effective and safe connectivity at lowered fee * ebook comprises thorough discussions of all Cisco entry Servers and routers
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Additional info for Administering Cisco QoS in IP Networks
There are three general types of DoS attacks : Smurf, SYN floods, and Fraggle. com 33 110_QoS_01 34 2/13/01 6:35 PM Page 34 Chapter 1 • Cisco IOS Feature Review to tie up the servers and the network. The Fraggle attack uses a flood of broadcasts, like a Smurf attack, but it uses UDP echo requests instead of ICMP echo requests. Extended ACLs can both track and deny each of these attacks. The following example would enable you to track a Smurf attack if you believed one was occurring on your network.
Extended ACLs can both track and deny each of these attacks. The following example would enable you to track a Smurf attack if you believed one was occurring on your network. This would be evident if there were an outstanding number of matches on this access list. The following command enables you to see the source address. Router1(config)#interface serial 1 Router1(config-if)#no ip access-group 102 in Router1(config-if)#exit Router1(config)#no access-list 102 permit icmp any any echo-reply Router1(config)#access-list 102 permit icmp any any echo-reply log Router1(config)#interface serial 1 Router1(config-if)#ip access-group 102 in Only pings were allowed in the above example.
Com 110_QoS_01 2/13/01 6:35 PM Page 15 Cisco IOS Feature Review • Chapter 1 Router1(config-router)#network network-number Here is the example. To do this, you use the show running-config command. Browse down to the IGRP section of your configuration file to confirm the changes have been accepted. 0 After confirming that there were no mistyped commands and that the configuration is indeed correct, you then save the file to your startup configuration by using the following command. Router1#copy running-config startup-config Routing loops can occur on a network because of slow convergence times or inconsistent routing entries.