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Extra resources for Building Large Frame Relay Networks with OSPF Summary
All rights reserved. Copyright © 2003, Cisco Systems, Inc. All rights reserved. Printed in USA. 3 for PIX • IPSec pass-thru feature is supported on certain NAT/PAT devices; ISAKMP cookie and ESP SPI are used to build translation table • NAT -T is turned on by default on Cisco IOS • Use isakmp nat-traversal
GRE over IPSec Tunnel Mode a b c d SEC-3010 8121_05_2003_c2 IP hdr 3 IP Hdr 1 TCP hdr Data IP hdr 2 GRE hdr IP Hdr 1 TCP hdr Data IP hdr 2 ESP hdr GRE hdr IP Hdr 1 TCP hdr Data ESP hdr IP hdr 2 GRE hdr IP Hdr 1 TCP hdr Data © 2003, Cisco Systems, Inc. All rights reserved. Copyright © 2003, Cisco Systems, Inc. All rights reserved. Printed in USA. 1 • Static or dynamic routing is needed to send VPN traffic to the GRE tunnel before it gets encrypted SEC-3010 8121_05_2003_c2 © 2003, Cisco Systems, Inc.
All rights reserved. Copyright © 2003, Cisco Systems, Inc. All rights reserved. Printed in USA. scr 90 Agenda Quiz Time The Purpose of • Introduction “crypto ipsec df-bit clear • Router IPSec VPNs” Is: • PIX IPSec VPNs 1. To adjust the TCP-MSS value in the syn • Cisco EasyVPN Clients packets • NAT with IPSec 2. To help the router in doing Path MTU • Firewalling and IPSec Discovery • MTU Issues 3. To drop the IPSec packets if don’t • GRE over IPSec fragment bit is set • Loss of Connectivity of IPSec Peers 4.