Chapter 03

Chapter 03 - Linux Networking and Security Chapter 3 1...

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1 Linux Networking and Security Chapter 3
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2 Configuring Client Services Configure DNS name resolution Configure dial-up network access using PPP Understand client services such as DHCP and LDAP Use remote graphical applications and remote dial-up authentication Use common client tools such as Linux Web browsers and email clients
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3 Setting Up Name Resolution The domain name service (DNS) is implemented by a domain name server The term domain name refers to the name of multiple hosts on the Internet that are collectively referred to The most widely known top-level domain is .com Within a top-level domain, an organization has its own domain or domains Network hosts are given names called hostnames A fully qualified domain name (FQDN) combines a hostname with the name of its domain
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4 Setting Up Name Resolution
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5 Configuring the DNS Resolver Manually The resolver is the client part of DNS It makes requests to a DNS server so that other workstation programs can use the IP address of a given server to make a network connection The resolver is configured by a single file in Linux: /etc/resolv.conf Configure the resolver by storing the IP address of one or more DNS servers in the resolv.conf file, proceeded by the keyword nameserver
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6 The hosts File Another way to convert an IP address to a domain name is store the IP address and corresponding domain names in a text file called /etc/hosts on your host The /etc/hosts.conf or /etc/nsswitch.conf files determine the order in which the resolver looks to various sources to resolve IP addresses
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7 Configuring the DNS Resolver Graphically
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8 Configuring the DNS Resolver Graphically
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9 Configuring the DNS Resolver Graphically
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10 Configuring the DNS Resolver Graphically
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11 Dial-up Network Access Using PPP PPP is widely used to connect to the Internet via modem PPP includes feature that make it more secure, flexible, and dependable than terminal emulation In reality, PPP was not very secure and was challenging to configure and manage Two advances improve PPP security: Password Authentication Protocol (PAP) stores user data in a
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Chapter 03 - Linux Networking and Security Chapter 3 1...

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