[CentOS] DHCP problem with virtual interfaces
000: 4510 015e 1011 2d84 0ac0 3215 E..^..-...2.
0x0010: 0ac0 3467 0043 0044 014a a1f7 0201 0600 ..4g.C.D.J..
0x0020: 043e 3322 0ac0 3467 .>3"..4g
0x0030: 0050 5600 3700 .PV.7...
0x0040:
0x0050: ..
16:39:52.902950 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request
from 00:50:56:00:37:00, length: 300
0x: 4510 0148 1011 a996 E..H
0x0010: 0044 0043 0134 f9b0 0101 0600 .D.C.4..
0x0020: 043e 3322 .>3"
0x0030: 0050 5600 3700 .PV.7...
0x0040:
0x0050: ..
16:39:52.903093 IP 10.192.50.21.bootps > 255.255.255.255.bootpc: BOOTP/DHCP,
Reply, length: 300
0x: 4510 0148 1011 6cc1 0ac0 3215 E..H..l...2.
0x0010: 0043 0044 0134 8114 0201 0600 .C.D.4..
0x0020: 043e 3322 8000 .>3"
0x0030: 0ac0 3215 0050 5600 3700 ..2..PV.7...
0x0040:
0x0050: ..
--
Simone Caldana
Senior Consultant
Critical Path
via Cuniberti 58, 10100 Torino, Italia
+39 011 4513811 (Direct)
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Re: [CentOS] DHCP problem with virtual interfaces
John, thanks for the feedback. Il giorno 11/ago/2010, alle ore 19.46, JohnS ha scritto: > That was my solution to use static IPs. on the Linux Machines only. You > do not see this under Windows. this reinforces my idea this is a dhclient bug rather than dhcpd's. >> Attached a txt with the tcpdump of the above log extraction. > > That dump is not long enough to tell anything funny going on. I know. I reported it to pair it with the the above messages log. It doesn't seem to me these packets contain the dhcp-client-identifier.. I am collecting port 67 traffic on the dhcp server since this afternoon. I hope to be able to find out more. -- Simone Caldana Senior Consultant Critical Path via Cuniberti 58, 10100 Torino, Italia +39 011 4513811 (Direct) +39 011 4513825 (Fax) simone.cald...@criticalpath.net http://www.cp.net/ Critical Path A global leader in digital communications ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] DHCP problem with virtual interfaces
Il giorno 11/ago/2010, alle ore 20.31, Simone Caldana ha scritto: > > I am collecting port 67 traffic on the dhcp server since this afternoon. I > hope to be able to find out more. further testing revealed that dhclient really asks for the wrong ip (but always sends the client-identifier), and this is due to the poisoned leases file. I am now using /dev/null as leases file for all the virtual dhclients, but I wonder if this disables the entire "keep the old lease" system (which I don't really need) or it simply stays only in memory, which won't really solve the problem. -- Simone Caldana ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] DHCP problem with virtual interfaces
Il giorno 12/ago/2010, alle ore 10.51, Simone Caldana ha scritto: > Il giorno 11/ago/2010, alle ore 20.31, Simone Caldana ha scritto: >> >> I am collecting port 67 traffic on the dhcp server since this afternoon. I >> hope to be able to find out more. > > further testing revealed that dhclient really asks for the wrong ip (but > always sends the client-identifier), and this is due to the poisoned leases > file. I am now using /dev/null as leases file for all the virtual dhclients, > but I wonder if this disables the entire "keep the old lease" system (which I > don't really need) or it simply stays only in memory, which won't really > solve the problem. bug has been filed, patch has been proposed: https://bugzilla.redhat.com/show_bug.cgi?id=623953 Jeremiah Jinno discovered the problem and proposed a patch upstream to ISC: https://lists.isc.org/mailman/htdig/dhcp-users/2010-June/011521.html -- Simone Caldana ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
