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DHCP

DHCP. Ana Chanaba Robert Huylo. DHCP Background / Server. dhcpd - Dynamic Host Configuration Protocol Server allows hosts on a TCP/IP network to request and be assigned IP addresses from a pool defined in dhcpd.conf adds lease concept to BOOTP predecessor. DHCP Background / Server.

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DHCP

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  1. DHCP Ana Chanaba Robert Huylo

  2. DHCP Background / Server • dhcpd - Dynamic Host Configuration Protocol Server • allows hosts on a TCP/IP network to request and be assigned IP addresses from a pool defined in dhcpd.conf • adds lease concept to BOOTP predecessor

  3. DHCP Background / Server • reads dhcpd.conf and assembles list of addresses for use in subnet • allocates address following request • assigns a lease to client • records lease in dhcpd.leases • server can keep lease states across boots • renews expired leases for clients

  4. DHCP Background / Client • dhcpcd – dhcp client • gets host info (IP address, netmask, gateway, etc.) from a DHCP server lab1 – 134.198.161.101 • configures own network interface • requests lease and lease renewals

  5. DHCP Server Installation • lab1.research.cs.uofs.edu • Network Servers installation package • dhcp-3.0.1-11

  6. etc/dhcpd.conf option domain-name "lab1.research.cs.uofs.edu"; option domain-name-servers 134.198.10.10, 134.198.100.150; default-lease-time 600; max-lease-time 7200; ddns-update-style ad-hoc; subnet 134.198.161.0 netmask 255.255.255.0 { range 134.198.161.50 134.198.161.99; option routers 134.198.161.254; }

  7. Starting DHCP Server • System Settings  • Server Settings  • Services  • dhcpd ** dhcrelay - dhcp servers on different subnets

  8. var/lib/dhcp/dhcpd.leases lease 134.198.161.99 { starts 2 2005/03/01 18:45:39; ends 2 2005/03/01 18:55:39; tstp 2 2005/03/01 18:55:39; binding state free; hardware ethernet 00:c0:f0:30:d7:11; uid "\001\000\300\3600\327\021"; } lease 134.198.161.98 { starts 4 2005/03/03 03:01:59; ends 4 2005/03/03 03:11:59; binding state active; next binding state free; hardware ethernet 00:e0:4c:96:f3:95; client-hostname "lab112.research.cs.uofs.edu"; }

  9. References • man pages – dhcpd.conf, dhcpcd, dhcpd, dhcpd.leases • DHCP RFC 2131 & 2132 -- R. Droms • DHCP HOWTO – Vladimir Vuksan www.linux.org • Text – Chp. 13.7

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