¡Hola!
> When I was reading Cisco doc, it says "IPSec ESP and
> AH protocols use protocol numbers 50 and 51". What is
> protocol number?
It's a field of IP header that says what protocol is the packet
carrying (tcp, udp, icpm, gre, ipip, ipsec, etc). Read RFC791
for more info.
HoraPe
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Horacio J. Peña
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