Lesson 5
Dates: 6/12/2017
Linux networking
Linux System Administration
TCP and UDP ports
Protocols TCP and UDP act as port managers for user applications.
Some ports listed in
/etc/services
:
systat 11/tcp users daytime 13/tcp daytime 13/udp netstat 15/tcp qotd 17/tcp quote msp 18/tcp # message send protocol msp 18/udp chargen 19/tcp ttytst source chargen 19/udp ttytst source ftp-data 20/tcp ftp 21/tcp fsp 21/udp fspd ssh 22/tcp # SSH Remote Login Protocol ssh 22/udp telnet 23/tcp smtp 25/tcp mail
Ports under
1024
are privileged ports.
Socket
= Port + IP address.
Any new connection opens a new socket.
Computers on a Network
TCP/IP protocol
OSI model
TCP/IP stack and Kernel
Packet Encapsulation
Link Layer Protocol
(Exercise)NIC naming
(Exercises) Link Layer Protocol
Network Layer Protocol
Subnet Mask
Network/Subnet splitting
Subnet Calculation
(Exercises) ipcalc
Packet Routing
Non-routable subnets and NAT
The loopback device
Transport Layer Protocols
TCP and UDP ports
Linux Network Settings
(Exercises) NIC name setting
(Exercises) Linux Network Settings
Hosts communication via TCP/IP
(Exercises) ICMP protocol
IPv6
IPv6 transition
Network Applications
Name Resolution
(Exercises) network services
(Exercises) Bridged network config
References
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