[ofa-general] dhclient will not accept offer
Roderick Flores
rflores at univaud.com
Mon Jul 21 13:16:09 PDT 2008
All:
I have two test machines, ib0-test and ib1-test, connect together by
a pair of QLogic InfiniPath QLE7140 HCAs. There is no router
involved. My goal is to test DHCP provisioning onver infiniband on
this simple topology. Unfortunately I am unable to get the client to
accept the offered address.
I have the DHCP daemon running on ib0-test. I have given the ib0
interface the following configuration:
DEVICE=ib0
ONBOOT=yes
BOOTPROTO=static
IPADDR=172.10.10.2
NETMASK=255.255.255.0
If I set the ib0 interface on ib1-test to a static IP similar to this
one, everything works well. However, if I try DHCP, it will not
accept the offered IP address. This is the configuration on ib1-test:
DEVICE=ib0
ONBOOT=yes
BOOTPROTO=dhcp
If I do a tcpdump on both nodes during the DHCP request, I get very
similar answers. On the dhcpd host, ib0-test, I get:
18:40:32.982491 IP ib1-test.bootpc > 255.255.255.255.bootps: BOOTP/
DHCP, Request, length: 300
18:40:32.984083 arp who-has 172.10.10.158 tell 172.10.10.2 hardware #32
18:40:33.001142 IP 172.10.10.2.bootps > 255.255.255.255.bootpc:
BOOTP/DHCP, Reply, length: 309
18:40:33.984028 arp who-has 172.10.10.158 tell 172.10.10.2 hardware #32
18:40:34.983974 arp who-has 172.10.10.158 tell 172.10.10.2 hardware #32
18:40:37.991935 IP ib1-test.bootpc > 255.255.255.255.bootps: BOOTP/
DHCP, Request, length: 300
18:40:37.992125 IP 172.10.10.2.bootps > 255.255.255.255.bootpc:
BOOTP/DHCP, Reply, length: 309
18:40:52.992217 IP ib1-test.bootpc > 255.255.255.255.bootps: BOOTP/
DHCP, Request, length: 300
18:40:52.992428 IP 172.10.10.2.bootps > 255.255.255.255.bootpc:
BOOTP/DHCP, Reply, length: 309
18:41:13.991209 IP ib1-test.bootpc > 255.255.255.255.bootps: BOOTP/
DHCP, Request, length: 300
18:41:13.991384 IP 172.10.10.2.bootps > 255.255.255.255.bootpc:
BOOTP/DHCP, Reply, length: 309
18:41:23.991705 IP ib1-test.bootpc > 255.255.255.255.bootps: BOOTP/
DHCP, Request, length: 300
18:41:23.991909 IP 172.10.10.2.bootps > 255.255.255.255.bootpc:
BOOTP/DHCP, Reply, length: 309
Whereas on the client host, ib1-test, I get:
18:40:32.991272 IP ib1-test.bootpc > 255.255.255.255.bootps: BOOTP/
DHCP, Request, length: 300
18:40:32.992963 arp who-has 172.10.10.158 tell 172.10.10.2 hardware #32
18:40:33.010013 IP 172.10.10.2.bootps > 255.255.255.255.bootpc:
BOOTP/DHCP, Reply, length: 309
18:40:33.992895 arp who-has 172.10.10.158 tell 172.10.10.2 hardware #32
18:40:34.992846 arp who-has 172.10.10.158 tell 172.10.10.2 hardware #32
18:40:38.000761 IP ib1-test.bootpc > 255.255.255.255.bootps: BOOTP/
DHCP, Request, length: 300
18:40:38.001014 IP 172.10.10.2.bootps > 255.255.255.255.bootpc:
BOOTP/DHCP, Reply, length: 309
18:40:53.001075 IP ib1-test.bootpc > 255.255.255.255.bootps: BOOTP/
DHCP, Request, length: 300
18:40:53.001363 IP 172.10.10.2.bootps > 255.255.255.255.bootpc:
BOOTP/DHCP, Reply, length: 309
18:41:14.000117 IP ib1-test.bootpc > 255.255.255.255.bootps: BOOTP/
DHCP, Request, length: 300
18:41:14.000366 IP 172.10.10.2.bootps > 255.255.255.255.bootpc:
BOOTP/DHCP, Reply, length: 309
18:41:24.000642 IP ib1-test.bootpc > 255.255.255.255.bootps: BOOTP/
DHCP, Request, length: 300
18:41:24.000917 IP 172.10.10.2.bootps > 255.255.255.255.bootpc:
BOOTP/DHCP, Reply, length: 309
There are no substantive differences between these two transfers.
Having said, that, there are differences at the packet level. I will
not insert all of the packet data for brevity's sake. However I can
offer an example: one packet may have the following data:
< 0000 00 00 00 20 00 00 00 00 00 00 00 00 00 00 08 00
> 0000 00 04 00 20 00 00 00 00 00 00 00 00 00 00 08 00
while a subsequent packet may have:
< 0000 00 04 00 20 00 00 00 00 00 00 00 00 00 00 08 06
> 0000 00 00 00 20 00 00 00 00 00 00 00 00 00 00 08 06
I will not claim to understand enough about TCP/IP transport to say
whether this is normal. From a pattern perspective, it appears to be
in line with what I would expect.
The TCP dumps are in line with the output I get in /var/log/
messages. From the dhcpd host machine I get:
Jul 18 17:41:35 ib0-test dhcpd: DHCPDISCOVER from via ib0
Jul 18 17:41:36 ib0-test dhcpd: DHCPOFFER on 172.10.10.158 to via ib0
Jul 18 17:41:40 ib0-test dhcpd: DHCPDISCOVER from via ib0
Jul 18 17:41:40 ib0-test dhcpd: DHCPOFFER on 172.10.10.158 to via ib0
Jul 18 17:41:54 ib0-test dhcpd: DHCPDISCOVER from via ib0
Jul 18 17:41:54 ib0-test dhcpd: DHCPOFFER on 172.10.10.158 to via ib0
Jul 18 17:42:13 ib0-test dhcpd: DHCPDISCOVER from via ib0
Jul 18 17:42:13 ib0-test dhcpd: DHCPOFFER on 172.10.10.158 to via ib0
Jul 18 17:42:23 ib0-test dhcpd: DHCPDISCOVER from via ib0
Jul 18 17:42:23 ib0-test dhcpd: DHCPOFFER on 172.10.10.158 to via ib0
while the client machine has:
Jul 18 17:41:35 ib1-test dhclient: Sending on Socket/fallback
Jul 18 17:41:35 ib1-test dhclient: DHCPDISCOVER on ib0 to
255.255.255.255 port 67 interval 6
Jul 18 17:41:41 ib1-test dhclient: DHCPDISCOVER on ib0 to
255.255.255.255 port 67 interval 14
Jul 18 17:41:54 ib1-test dhclient: DHCPDISCOVER on ib0 to
255.255.255.255 port 67 interval 19
Jul 18 17:42:14 ib1-test dhclient: DHCPDISCOVER on ib0 to
255.255.255.255 port 67 interval 10
Jul 18 17:42:24 ib1-test dhclient: DHCPDISCOVER on ib0 to
255.255.255.255 port 67 interval 12
Jul 18 17:42:35 ib1-test dhclient: No DHCPOFFERS received.
What baffles me is that the offer is made but never accepted. I have
tried any number of changes to the dhclient.conf file to avoid
rejections, to no avail.
Finally, I will leave you with the relevant configuration files...
/etc/dhcpd.conf on ib0-test:
ddns-update-style interim;
ignore client-updates;
subnet 172.10.10.0 netmask 255.255.255.0 {
range dynamic-bootp 172.10.10.100 172.10.10.200;
option domain-name "univaud.com";
option domain-name-servers 192.168.31.10, 10.10.0.12,
10.10.0.13;
#option routers 192.168.31.1;
option subnet-mask 255.255.255.0;
option time-offset -21600; # Central Standard Time
option ntp-servers 64.113.32.5, 65.111.164.223,
72.52.190.26;
default-lease-time 21600;
max-lease-time 43200;
}
/etc/dhclient.conf on ib1-test:
interface "ib0" {
send dhcp-client-identifier 20:00:55:00:01:FE:
80:00:00:00:00:00:00:00:11:75:00:00:ff:94:fd;
}
I created the client identifier from the following information:
20:<4 byte QP Number><8-byte subnet prefix><8 byte GUID>.
This seems to be in line with the patch that we applied to the DHCP
software to make it work with infiniband.
Lastly, an excerpt from /etc/modules.conf on ip1-test:
alias ib0 ib_ipoib
I tried to use ipath_ether but qlogic's website only has the RHEL4
release (despite having a RHEL5 label).
Cheers!!!
--
Roderick Flores
Solutions Architect
Univa UD
rflores at univaud.com
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