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20 eq tftp ! Encrypt any traffic matching these conditions. Note that the ! NAT’d addresses are the source addresses. 6 318 0944_05F9_c1 91 © 1999, Cisco Systems, Inc. 1 318 0944_05F9_c1 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. 225 • Port numbers used for VOIP may not be well-known and may be negotiated 318 0944_05F9_c1 © 1999, Cisco Systems, Inc. 729 encoded voice is 100 bytes across an IPSEC facility • At 50pps 100 byteframes, a 56kb link can only accommodate a single call (50 x 100bytes = 40kb) • RTP header compression is not available to IPSEC frames 318 0944_05F9_c1 © 1999, Cisco Systems, Inc.

20 318 0944_05F9_c1 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. scr 84 42 IPSec, NAT and Cisco IOS Firewall ! IOS Firewall Timeout declarations ip inspect name firewall tcp timeout 3600 ip inspect name firewall udp timeout 15 ! Define your IKE Policies. All will be offered to the Peer and the most ! secure match will be used crypto isakmp policy 1 hash md5 authentication pre-share ! If the peer can accept this policy, then it will be used as it is more !

Used so that the peers identity need not be defined here. Note ! that this router must still authenticate the incoming client via ! either a Pre-Shared key, or a certificate. This is the dynamic ! map’s template. crypto dynamic-map remotes 1 set transform-set desmd5 match address 120 318 0944_05F9_c1 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. scr 86 43 IPSec, NAT and Cisco IOS Firewall ! Regular crypto maps are defined here. The first map allows the !

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