home *** CD-ROM | disk | FTP | other *** search
- Linux DHCPD mini-HOWTO
- by Paul Makeev <mac@RoSprint.net>
- v1.2, 24 June 1997
-
-
- 1. Introduction
-
- DHCP is Dynamic Host Configuration Protocol. It is used to control
- vital networking parameters of hosts (running clients) with the help
- of server (running, suprise!, server daemon). DHCP is backward compatible
- with BOOTP. For more information see RFC 2131 (old RFC 1531) and other.
- (See Internet Resources section at the end of the document).
-
- This mini-HOWTO is about DHCP _SERVER_ daemon. There is DHCP _client_ daemon
- for Linux, which is not described here. You can find _client_ package at:
-
- Primary-site: ftp.kobe-u.ac.jp /pub/PC-UNIX/Linux/network/dhcp
- 32kB dhcpcd-0.65.tar.gz
- Alternate-site: sunsite.unc.edu /pub/Linux/system/network/daemons
- 32kB dhcpcd-0.65.tar.gz
-
- 2. DHCPD server for Linux.
-
- There is several DHCP servers available for U*X-like OSes, both commercial
- and free. I have success with Paul Vixie/ISC DHCPD. I used Beta-5.0.9, and now
- use 5.0.14. These are both not Linux-specific versions, but they flawlessly
- compile and work (not so flawlessly). You can get latest software at:
-
- http://www.isc.org/dhcp/dhcp-beta.html (It is not updated yet, however)
-
- or, the latest version for now:
-
- ftp://ftp.isc.org/isc/dhcp/DHCPD-BETA-5.16.tar.gz
-
- There is no distributions of DHCP on ftp.vix.com now. They are moved to
- ftp.isc.org.
-
-
- NB!!! READ CAREFULY the README file before compiling and installing. It contains
- Linux-specific info.
-
- 3. Kernel configuration.
-
- You should have MULTICAST enabled in kernel. Of course, TCP/IP
- networking should be enabled also :-)
-
- 4. Configuration.
-
-
- ifconfig -a should say smth like:
-
- eth0 Link encap:10Mbps Ethernet HWaddr 00:C0:4F:D3:C4:62
- inet addr:183.217.19.43 Bcast:183.217.19.255 Mask:255.255.255.0
- UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
- RX packets:2875542 errors:0 dropped:0 overruns:0
- TX packets:218647 errors:0 dropped:0 overruns:0
- Interrupt:11 Base address:0x210
-
- If there is no "MULTICAST" letters, you should reconfigure your kernel to
- add multicast support (and reboot, of course). You don't need to do
- anything else to enable multicasting.
-
- You should have "netstat -rn" saying:
-
- dhcps:~$ netstat -rn
- Kernel routing table
- Destination Gateway Genmask Flags Metric Ref Use Iface
- 255.255.255.255 0.0.0.0 255.255.255.255 UH 0 0 101 eth0
-
- i.e., you should have multicast routing to your ethernet interface.
-
- 5. Problems with multicast.
-
- If your "route add -host 255.255.255.255 eth0" command says smth like
- "255.255.255.255: Unknown host", try adding host with this address to
- /etc/hosts file, and issue "route add -host hostname eth0" instead. It should
- work. If not, get newer Networking utils and/or upgrade kernel version.
-
- 6. DHCPD configuration.
-
- Read the included docs. It's too complicated to discuss here.
-
- 7. Can i run DHCPD on machine with two or more Ethercards?
-
- According to dhcpd mailing list, newest stable kernal, 2.0.31 could
- work with newest version of DHCPD (5.0.15) to support more than one
- interface. According to dhcp-server mailing list, Linux 2.0.31 have
- SO_BINDTODEVICE code, which makes it possible to distinguish raw interfaces,
- thus newer DHCPD could work on two interfaces in Linux. This feature,
- however, is _extremely BETA_. I didn't check it yet, but will do it
- and place success information into next version of howto.
-
- PLEASE! Don't ask me where to get kernel 2.0.31. It is unofficial
- pre-patch at the time this document was created.
-
- 8. Dynamic DNS.
-
- There is a proposed DNS and DHCP server integration mechanisms to
- enable dynamic DNS. You can read RFC 2136 and 2137. Several DHCP and
- DNS servers could have proprietary mechanisms to update DNS information.
- BIND v.8, which supports dynamic updates, is developed by ISC also,
- and i hope DHCPD and BIND would be integrated in short time.
-
- BIND v.8 URL: http://www.isc.org/bind.html.
-
- I wrote a Python program, which automates adding host to DHCP and DNS
- tables. If you want more info on it, write me (mac@rosprint.net). It is
- not RFC-compliant, but does dirty work.
-
-
- 9. Internet Resources:
-
- http://www.isc.org/dhcp.html
- ISC DHCP home page. You can get a lot of information here.
- This is my favorite site.
-
- http://www.isc.org/bind.html
- BIND v.8 information.
-
- http://www-leland.stanford.edu/%7Ellurch/win95netbugs/faq-c.html
- A comprehensive list of setting for Windows-95.
-
- http://www.bucknell.edu/~droms/dhcp/index.html
- Very good FAQ on DHCP, a lot of links. By Ralph Droms.
-
- http://web.syr.edu/~jmwobus/comfaqs/dhcp.faq.html
- Good general DHCP FAQ. A lot of info, lists of resources. By John Wobus.
-
- Mailing lists:
- dhcp-server@fugue.com - list discussing ISC/Vixie DHCPD.
- dhcp-v4@bucknell.edu - list discussing bucknell DHCPD
-
-