Red Hat Bugzilla – Bug 133522
Cannot netboot hosts with dhcp 3.0.1-8
Last modified: 2007-11-30 17:10:49 EST
Under the stock FC2 release of dhcp (3.0.1rc14-1), I can use a stanza like this: host netinstall { hardware ethernet 00:0d:87:00:95:e2; option domain-name "math.uh.edu"; option subnet-mask 255.255.255.0; option routers 129.7.128.254; fixed-address 129.7.128.251; next-server 129.7.128.34; filename "/pxelinux.0"; } to boot a host over the network. But under the current rawhide release (3.0.1-8) this doesn't work. Reverting to the older version (without making any changes to the configuration file) fixes the problem. I will attach two short packet captures showing a request and a response from each server. The responses are basically the same, but with 3.0.1-8 the "next-server" and "filename" options seem to be ignored. Unfortunately you folks kindly pushed 3.0.1-8 out for me because it fixes another rather serious bug.
Created attachment 104272 [details] Packet capture from 3.0.1-8 server showing bad response.
Created attachment 104273 [details] Packet capture from 3.0.1rc14-1 server showing good response.
Yes, you are quite correct - dhcp-3.0.1-8 seems to be sending a DHCPOFFER that is not accepted by the PXE Boot client . I am now investigating and will solve as #1 priority.
I have found a bug fix for this problem . It was caused by the piece of old code that was exercised by the patch from ISC for bug #131212, that rejected a host match if it had a "fixed-address". I've now made it accept such hosts, but both I and the DHCP developers are continuing to search for a more satisfactory fix for bug #131212. You can download the new dhcp-3.0.1-9 release, with the temporary fix applied (that does work, and does not cause 131212 to reappear) from: http://people.redhat.com/~jvdias/DHCP/3.0.1-9 You can build the srpm with: rpmbuild --rebuild dhcp-3.0.1-9.src.rpm or install the binaries compiled for FC2 from the "FC2" subdirectory.
A better fix for both bug 131212 and this bug has been found and incorporated into dhcp-3.0.1-9, now submitted to FC3 and compiled for FC2 at: http://people.redhat.com/~jvdias/DHCP/3.0.1-9 I have tested : 1. Defining a group of hosts with 'deny booting' defined 2. Defining one 'host b { ... }' with a 'filename' parameter One of the hosts with deny booting tries to get a lease and gets 'booting disallowed' error Then the host with the filename entry does a PXE Boot and obtains a lease and the boot file OK. This now appears to be fixed. Testing of this new dhcp-3.0.1-9 release on a large busy subnet would be appreciated.
A week of testing has shown this version to be stable. However, I see that 3.0.1-11 has hit rawhide today so I will test it as well.
Many thanks for your help in testing DHCP. I implemented the fix in dhcp-3.0.1-9; then, in consultation with the ISC developers, I made some cosmetic changes in dhcp-3.0.1-10; then, yesterday ISC released dhcp-3.0.2b1, which contained a fix missing from dhcp-3.0.1-10. So now dhcp-3.0.1-11 contains the full fix as implemented in ISC DHCP 3.0.2 - I hope it works well for you!
P.S. - the dhcp-3.0.1-11 srpm and binary RPMS compiled for FC2 are at: http://people.redhat.com/~jvdias/DHCP/FC2
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHBA-2004-566.html