By Sean Convery, and Bernie Trudel
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Extra info for A Security Blueprint for Enterprise Networks
Page 39 of 66 The following configuration snapshot defines the access control present on all the OOB interfaces throughout the network. Keep in mind that this is in addition to the private VLANs which block access between managed host IP addresses. 0 ip access-group 101 in ip access-group 102 out no cdp enable ! 15 eq ntp access-list 101 deny ip any any log access-list 102 deny ip any any log Switches Here is the base security configuration present on nearly all CAT OS switches in the SAFE lab.
As in the remote-access VPN service the AAA and one-time password servers are used to authenticate and provide passwords. Once authenticated the users are provided with IP addresses from an IP pool through PPP. Site-to-site VPN The VPN traffic associated with site-to-site connections consists of GRE tunnels protected by an IPSec protocol in transport mode using Encapsulated Security Payload (ESP). As in the remote-access case, the traffic that is forwarded from the corporate Internet module can be limited to the specific destination addresses on the two VPN routers and the source addresses expected from the remote sites.
These so-called “anti-sniffers” detect changes in the response time of hosts to determine if the hosts are processing more traffic than their own. One such network security software tool, which is available from Security Software Technologies, is called AntiSniff. com/antisniff/ Cisco Systems Copyright © 2000 Cisco Systems, Inc. All Rights Reserved. Page 57 of 66 • Cryptography – The most effective method for countering packet sniffers does not prevent or detect packet sniffers, but rather renders them irrelevant.
A Security Blueprint for Enterprise Networks by Sean Convery, and Bernie Trudel