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I created a bridge using brctl called dhcp_test_br, and bind my new created kvm virtual machine to this bridge.

Then I ran dnsmasq:

dnsmasq --strict-order --bind-interfaces --interface=dhcp_test_br --except-interface lo --enable-ra --dhcp-range=2100:100::3,2100:100::4ff,slaac

I captured packets from both side, and found that such packets:

fe80::d489:56ff:fea1:67d3 > ip6-allnodes: HBH ICMP6, multicast listener querymax resp delay: 1000 addr: ::, length 24
fe80::d489:56ff:fea1:67d3 > ff02::1:ff00:1: HBH ICMP6, multicast listener reportmax resp delay: 0 addr: ff02::1:ff00:1, length 24
fe80::d489:56ff:fea1:67d3 > ff05::1:3: HBH ICMP6, multicast listener reportmax resp delay: 0 addr: ff05::1:3, length 24
fe80::d489:56ff:fea1:67d3 > ff02::1:2: HBH ICMP6, multicast listener reportmax resp delay: 0 addr: ff02::1:2, length 24
fe80::d489:56ff:fea1:67d3 > ip6-allrouters: HBH ICMP6, multicast listener reportmax resp delay: 0 addr: ip6-allrouters, length 24
fe80::d489:56ff:fea1:67d3 > ff02::1:ffa1:67d3: HBH ICMP6, multicast listener reportmax resp delay: 0 addr: ff02::1:ffa1:67d3, length 24

cannot be found on the virtual machine.(fe80::d489:56ff:fea1:67d3is the address of the bridge)

So how could I solve this and assign IPv6 addresses properly?

Update: changed the IPv6 range from 10:xx to 2100:xx, seems no difference

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  • 2
    The first thing I would do would be to use a valid IPv6 address range.
    – Michael Hampton
    May 29, 2013 at 4:19
  • @MichaelHampton What do you mean by valid? You may try a higher version of dnsmasq. The default version on Ubuntu doesn't work.
    – can.
    May 29, 2013 at 4:22
  • Valid, as in valid public (or unique-local) address. Public addresses start with 001 (binary), so these are 2xxx:: and 3xxx:: addresses
    – mulaz
    May 29, 2013 at 5:16
  • Your dhcpd configuration would be nice. That said, you should avoid using DHCP to assign addresses in ipv6. Servers which require a static IP should have this configured, and others should use route advertisements and self-assign an address. You can still use DHCPv6 to provide configuration details like DNS servers and do DNS autoupdate.
    – Falcon Momot
    Jun 26, 2013 at 3:33

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