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Networking

Networking. SPARCS 2000 wheel seminar netj@sparcs.kaist.ac.kr. TCP/IP. Low-level networking software most commonly used with UNIX Internet Protocol Internet Control Message Protocol Address Resolution Protocol User Datagram Protocol. TCP/IP network model. Link layer

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Networking

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  1. Networking SPARCS 2000 wheel seminar netj@sparcs.kaist.ac.kr

  2. TCP/IP • Low-level networking software most commonly used with UNIX • Internet Protocol • Internet Control Message Protocol • Address Resolution Protocol • User Datagram Protocol

  3. TCP/IP network model • Link layer • Network hardware, device drivers • Network layer • Basic comm., addressing, routing • Transport layer • Comm. Among net programs • Application layer • Application programs

  4. Addresses • Hardware address • IP Address • IP: xxx.xxx.xxx.xxx, 4bytes • Port: TCP/UDP, 2bytes • Internet address classes (A,B,C,D,E)

  5. ARP • Address Resolution Protocol • Does address translation • IP  Hardware Address • arp command • RARP, BOOTP

  6. Routing • Process directing a packet through networks between its source and destination • RIP, OSPF, IGRP, EGP, BGP, DVMRP • ICMP redirects • CIDR (Classless Inter-Domain Routing) • route command • routed, gated

  7. Network commands • ifconfig: configuring network interfaces • route: configure static routes • ping: check if a host is alive • netstat: network status • traceroute: trace IP packets • tcpdump, etherfind, snoop, arp

  8. DNS • Domain Name System • Hostnames  IP addresses • Distributed database that holds info about computers on the Internet • BIND, named

  9. DNS defines, • Hierarchical namespace for hosts • Host table as a distributed database • Library routines for querying • Improved routing for email • Protocol for exchanging naming information

  10. DNS Namespace • Top-level domains • COM, EDU, NET, ORG, GOV … • Country codes • KR, JP, CA, UK … • Root domain . • Subdomains • sparcs.kaist.ac.kr, www.kaist.ac.kr

  11. DNS Architecture • IP  Domain Name • Reversed query • 143.248.234.102  102.234.248.143.IN-ADDR.ARPA.  sparcs.kaist.ac.kr • Domain Name  IP • Querying sparcs.kaist.ac.kr.  kr.  ac.kr.  kaist.ac.kr.  sparcs.kaist.ac.kr.

  12. NFS • Network File System • Share file systems among computers over network • mountd: mount responder • nfsd: serve files • biod: client-side caching • automount

  13. NIS • Network Information Service • Sharing system files • rdist: push files • expect: pull files • yp commands • NIS+

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