Simple: What is protocol 50 defined as?

[ert021]

Hi, all sorry for such a simple question. But im hoping that someone could just solidify what i *think I already understand.

To my understanding Protocol 50, has been defined to me as (ESP). Others reference protocol 50 as (GRE). Is it defined as a combination of both?

Question: What is protocol 50...(ESP), or (GRE)...

Thanks!

[mostiguy]

esp is 50, ah is 51, gre is 47.

those are ip protocol numbers. udp is 17, tcp is 6.

if you have a unix box handy, take a look at /etc/protocols.

the one on windows boxen is terrible, it hasn't been updated for years it looks.

[l.mourits]

Hi,

If you are in doubt for these type of questions you should always check http://www.iana.org (IANA is the Internet Assigned Numbers Authority and always has the current registered numbers).

Here´s the link to protocol-numbers:

http://www.iana.org/assignments/protocol-numbers

Kind regards,

Leo