[Kea-users] perfdhcp error

[Vikram Hosakote (vhosakot)]

Hi Marcin, Kea team,

Hope you are doing good.

I have been running perfdhcp using an interface inside a Linux namespace
successfully. I have also been able to successfully run multiple instances of
perfdhcp using interfaces in multiple namespaces simultaneously.

But, when I have 2,000 namespaces and run perfdhcp inside each of these
namespaces, I see that perfdhcp throws the following error even though the
interface used by perfdhcp has an IP address. This error is NOT seen when I
run perfdhcp instances in a few (100-200) namespaces but is seen when I
run them in 2,000 namespaces.

Error running perfdhcp: There is no address for interface: tapa748acb8-a1, port: 67, address  family: AF_INET

Below is the interface tapa748acb8-a1 (inside the namespace
testns-DHCP-network-0) that has the IP address 1.0.0.1. The interface is up.

# sudo ip netns exec testns-DHCP-network-0 ifconfig
tapa748acb8-a1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 1.0.0.1  netmask 255.255.255.0  broadcast 1.0.0.255
        ether ee:ff:ff:ff:ff:ef  txqueuelen 0  (Ethernet)
        RX packets 138  bytes 9280 (9.0 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 45  bytes 3590 (3.5 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Below is the perfdhcp output (with verbose diagnostics enabled). Could you
please let me know what the issue is. What am I missing ? Is this a
scale/concurrency issue ? The same exact perfdhcp command below works
perfectly fine when I have a few (100-200) namespaces and run perfdhcp
instances using interfaces in them.

# sudo ip netns exec testns-DHCP-network-0 /usr/local/sbin/perfdhcp -x aeistT -4 -b mac=fa:16:00:00:00:00 -r 5 -R 5 -p 10 -l tapa748acb8-a1
Running: perfdhcp -x aeistT -4 -b mac=fa:16:00:00:00:00 -r 5 -R 5 -p 10 -l tapa748acb8-a1
IPv4
lease-type=address-only (IA_NA option added to the client's request)
rate[1/s]=5
clients=5
base[0]=mac=fa:16:00:00:00:00
test-period=10
drop-time[0]=1
drop-time[1]=1
aggressivity=1
broadcast
elp-offset=-1
sid-offset=-1
rip-offset=-1
diagnostic-selectors=aeistT
interface=tapa748acb8-a1
server=255.255.255.255
Set MAC to fa::16::00::00::00::00
Set DUID to 000100011d793ce4000c01020304
Error running perfdhcp: There is no address for interface: tapa748acb8-a1, port: 67, address  family: AF_INET
#


Regards,
Vikram Hosakote
OpenStack Software Engineer
vhosakot at cisco.com<mailto:vhosakot at cisco.com>
Cloud and Virtualization Group
Cisco Systems
Boxborough, MA, USA
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