[Dnsmasq-discuss] "No IPv6 address available" for bulk request from IXIA DHCPv6 clients

P, Sreelakshmi sreelakshmi.p at hpe.com
Thu Feb 7 10:12:05 GMT 2019 

Hi All,

I'm trying to simulate DHCPv6 clients from IXIA and observe that only 1 or 2 clients gets honored with IPv6 address when simultaneous requests are sent from 64 clients, but the same thing works if the request is made one after the other sequentially.

Configuration below:

                log-facility=/var/log/dnsmasq_swns/dnsmasq6.log
port=0
dhcp-script=/usr/bin/dhcp_server_leases
leasefile-ro
dhcp-lease-max=64000
bind-dynamic
dhcp-range=set:default+test,2000::e:2,2000::e:3
dhcp-range=set:default+test,2000::27:1,2000::27:2
dhcp-range=set:default+test,2000::16:1,2000::16:2
dhcp-range=set:default+test,2000::7:1,2000::7:2
dhcp-range=set:default+test,2000::26:1,2000::26:2
dhcp-range=set:default+test,2000::3b:1,2000::3b:2
dhcp-range=set:default+test,2000::32:1,2000::32:2
dhcp-range=set:default+test,2000::40:1,2000::40:2
dhcp-range=set:default+test,2000::28:1,2000::28:2
dhcp-range=set:default+test,2000::1b:1,2000::1b:2
dhcp-range=set:default+test,2000::3f:1,2000::3f:2
dhcp-range=set:default+test,2000::12:1,2000::12:2
dhcp-range=set:default+test,2000::9:1,2000::9:2
dhcp-range=set:default+test,2000::d:1,2000::d:2
dhcp-range=set:default+test,2000::36:1,2000::36:2
dhcp-range=set:default+test,2000::24:1,2000::24:2
dhcp-range=set:default+test,2000::1f:1,2000::1f:2
dhcp-range=set:default+test,2000::34:1,2000::34:2
dhcp-range=set:default+test,2000::21:1,2000::21:2
dhcp-range=set:default+test,2000::3a:1,2000::3a:2
dhcp-range=set:default+test,2000::17:1,2000::17:2
dhcp-range=set:default+test,2000::3d:1,2000::3d:2
dhcp-range=set:default+test,2000::1:1,2000::1:2
dhcp-range=set:default+test,2000::f:1,2000::f:2
dhcp-range=set:default+test,2000::22:1,2000::22:2
dhcp-range=set:default+test,2000::14:1,2000::14:2
dhcp-range=set:default+test,2000::2c:1,2000::2c:2
dhcp-range=set:default+test,2000::19:1,2000::19:2
dhcp-range=set:default+test,2000::1d:1,2000::1d:2
dhcp-range=set:default+test,2000::2:1,2000::2:2
dhcp-range=set:default+test,2000::37:1,2000::37:2
dhcp-range=set:default+test,2000::a:1,2000::a:2
dhcp-range=set:default+test,2000::38:1,2000::38:2
dhcp-range=set:default+test,2000::2a:1,2000::2a:2
dhcp-range=set:default+test,2000::23:1,2000::23:2
dhcp-range=set:default+test,2000::2b:1,2000::2b:2
dhcp-range=set:default+test,2000::4:1,2000::4:2
dhcp-range=set:default+test,2000::15:1,2000::15:2
dhcp-range=set:default+test,2000::8:1,2000::8:2
dhcp-range=set:default+test,2000::35:1,2000::35:2
dhcp-range=set:default+test,2000::1e:1,2000::1e:2
dhcp-range=set:default+test,2000::b:1,2000::b:2
dhcp-range=set:default+test,2000::3c:1,2000::3c:2
dhcp-range=set:default+test,2000::25:1,2000::25:2
dhcp-range=set:default+test,2000::3:1,2000::3:2
dhcp-range=set:default+test,2000::33:1,2000::33:2
dhcp-range=set:default+test,2000::31:1,2000::31:2
dhcp-range=set:default+test,2000::6:1,2000::6:2
dhcp-range=set:default+test,2000::18:1,2000::18:2
dhcp-range=set:default+test,2000::11:1,2000::11:2
dhcp-range=set:default+test,2000::1a:1,2000::1a:2
dhcp-range=set:default+test,2000::3e:1,2000::3e:2
dhcp-range=set:default+test,2000::2d:1,2000::2d:2
dhcp-range=set:default+test,2000::2e:1,2000::2e:2
dhcp-range=set:default+test,2000::39:1,2000::39:2
dhcp-range=set:default+test,2000::30:1,2000::30:2
dhcp-range=set:default+test,2000::5:1,2000::5:2
dhcp-range=set:default+test,2000::10:1,2000::10:2
dhcp-range=set:default+test,2000::c:1,2000::c:2
dhcp-range=set:default+test,2000::2f:1,2000::2f:2
dhcp-range=set:default+test,2000::29:1,2000::29:2
dhcp-range=set:default+test,2000::20:1,2000::20:2
dhcp-range=set:default+test,2000::1c:1,2000::1c:2
dhcp-range=set:default+test,2000::13:1,2000::13:2
# -------------------------------------------------------

Interface IP:

root at 8320:~# ip -6 addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 state UNKNOWN qlen 1
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: bridge-vrf: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9198 state UP qlen 1000
    inet6 fe80::1c5c:2ff:fe4f:8fb8/64 scope link
       valid_lft forever preferred_lft forever
3: tap-br0 at tap0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9198 state UP qlen 1000
    inet6 fe80::e8fb:ecff:fed5:1091/64 scope link
       valid_lft forever preferred_lft forever
4: tap0 at tap-br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9198 state UP qlen 1000
    inet6 fe80::1/64 scope link
       valid_lft forever preferred_lft forever
    inet6 fe80::bc2b:37ff:fe5c:be11/64 scope link
       valid_lft forever preferred_lft forever
61: vlan1 at bridge_normal: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 state UP qlen 1000
    inet6 2000::e:1/64 scope global
       valid_lft forever preferred_lft forever
    inet6 fe80::cc37:ab80:1be:a7a/64 scope link
       valid_lft forever preferred_lft forever

Logs attached for both cases. It throws error "no address available" even though configured ranges can provide 64 IPs. Is there any known issues with Ixia DHCPv6 client ? What is the best tool to do performance testing of dnsmasq DHCPv6 server ?

Regards,
Sree
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