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This article mainly introduces the network security protocols, application protocol numbers and port numbers, the article is very detailed, has a certain reference value, interested friends must read it!

* * related protocols:

PPTP: the control plane uses the TCP1723 port, and the data plane is encapsulated in GRE (IP protocol number is 47).

L2TP: unencrypted L2TP is enclosed in the UDP1701 port. After encryption, you need to look at the tunnel encapsulation protocol used.

IKE: both the source and destination are UDP500. (that is, the ISAKMP message you usually see)

GRE: directly encapsulated in the IP message, the IP protocol number is 47.

ESP:ESP, like GRE, is directly encapsulated in IP, and the IP protocol number is 50.

Like ESP and GRE, AH:AH is directly encapsulated in IP, and the protocol number is 51.

NAT-T: after using NAT-T technology, the previous data is encapsulated in UDP4500.

SSL:TCP port 443

Common application layer protocols:

HTTP:TCP80

HTTPS:TCP 443

FTP:TCP21 is the control plane and 20 is the data plane. (note whether FTP is in passive mode or active mode.)

SSH:TCP22

TELNET:TCP 23

Remote Desktop: 3389

SQL Server TCP 1433

DNS:

DHCP:

Dynamic routing protocols:

RIP:UDP520,RIP V2 Multicast address 224.0.0.9

EIGRP: IP Protocol 89 Multicast address: 224.0.0.10

OSPF: IP Protocol 88 Multicast address: 224.0.0.5 (normal) 224.0.0.6 (DR and BDR)

BGP: TCP 179

The above is all the contents of the article "what are the protocols, application protocol numbers and port numbers in network security?" Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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