IP Header ESP IP Header GRE IP Header TCP/UDP Data Compared to regular IPSec, we waste 20bytes (IP Header) and 4bytes (GRE) To save 20bytes (IP Header) , we can make use of the Transport Mode which will just COPY the IP header over instead of creating new IP Header... [Read More]

NTP Configurations Cert_NTP: (We need this router to have the correct time since it is going to be the NTP server) Cert_NTP# clock set 00:01:00 01 March 2013 // with appropriate date and time Cert_NTP(config)# ntp master 1 Cert_NTP(config)# ntp authentication-key 1 md5 cisco123 Cert_NTP(config)# ntp trusted-key 1 Cert_NTP(config)# ntp... [Read More]