DHCPv6 client not able to get the address

[Kunal Sharma]

Friends,

I'm new to ISC and have recently started using DHCPv6 as a part of a project to migrate to IPv6. I have setup a dhcp server and client in my setup. When I use the dhclient to pull out an IP from the server, I can see the request and reply messages on the server. But I don't see (through ifconfig) my client interface getting the IP that server offers. Here's the tcpdump log from the server -

IP6 (hlim 64, next-header UDP (17) payload length: 52) fe80::200:60ff:fe0f:2.dhcpv6-client > ff02::1:2.dhcpv6-server: [udp sum ok]
                dhcp6 solicit (xid=806b81 (client ID hwaddr/time type 1 time 323351268 0000600f0002) (elapsed time 0) (IA_NA IAID:1611595778 T1:3600 T2:5400))

IP6 (hlim 255, next-header ICMPv6 (58) payload length: 32) fe80::221:91ff:fe8e:ae0c > ff02::1:ff0f:2: [icmp6 sum ok] ICMP6,
                neighbor solicitation, length 32, who has fe80::200:60ff:fe0f:2 source link-address option (1), length 8 (1): 00:21:91:8e:ae:0c 0x0000:  0021 918e ae0c

IP6 (hlim 255, next-header ICMPv6 (58) payload length: 32) fe80::200:60ff:fe0f:2 > fe80::221:91ff:fe8e:ae0c: [icmp6 sum ok] ICMP6,
                neighbor advertisement, length 32, tgt is fe80::200:60ff:fe0f:2, Flags [solicited, override] destination link-address option (2), length 8 (1): 00:00:60:0f:00:02
            0x0000:  0000 600f 0002

IP6 (hlim 64, next-header UDP (17) payload length: 92) fe80::221:91ff:fe8e:ae0c.dhcpv6-server > fe80::200:60ff:fe0f:2.dhcpv6-client: [udp sum ok]
                dhcp6 advertise (xid=806b81 (IA_NA IAID:1611595778 T1:0 T2:0 (IA_ADDR 2001:5c0:1106:2700::252 pltime:375 vltime:600))
                (client ID hwaddr/time type 1 time 323351268 0000600f0002) (server ID hwaddr/time type 1 time 323341550 0021918eae0c))

IP6 (hlim 64, next-header UDP (17) payload length: 98) fe80::200:60ff:fe0f:2.dhcpv6-client > ff02::1:2.dhcpv6-server: [udp sum ok]
                dhcp6 request (xid=21ce83 (client ID hwaddr/time type 1 time 323351268 0000600f0002) (server ID hwaddr/time type 1 time 323341550 0021918eae0c)
                (elapsed time 0) (IA_NA IAID:1611595778 T1:3600 T2:5400 (IA_ADDR 2001:5c0:1106:2700::252 pltime:7200 vltime:7500)))

IP6 (hlim 64, next-header UDP (17) payload length: 92) fe80::221:91ff:fe8e:ae0c.dhcpv6-server > fe80::200:60ff:fe0f:2.dhcpv6-client: [udp sum ok]
                dhcp6 reply (xid=21ce83 (IA_NA IAID:1611595778 T1:0 T2:0 (IA_ADDR 2001:5c0:1106:2700::252 pltime:375 vltime:600))
                (client ID hwaddr/time type 1 time 323351268 0000600f0002) (server ID hwaddr/time type 1 time 323341550 0021918eae0c))

IP6 (hlim 255, next-header ICMPv6 (58) payload length: 32) fe80::200:60ff:fe0f:2 > fe80::221:91ff:fe8e:ae0c: [icmp6 sum ok] ICMP6,
                neighbor solicitation, length 32, who has fe80::221:91ff:fe8e:ae0c source link-address option (1), length 8 (1): 00:00:60:0f:00:02
            0x0000:  0000 600f 0002

IP6 (hlim 255, next-header ICMPv6 (58) payload length: 24) fe80::221:91ff:fe8e:ae0c > fe80::200:60ff:fe0f:2: [icmp6 sum ok] ICMP6,
                neighbor advertisement, length 24, tgt is fe80::221:91ff:fe8e:ae0c, Flags [router, solicited]

Here's my dhcp server's conf file (a very basic one since I've just started) -

default-lease-time 600;
max-lease-time 7200;
log-facility local7;
subnet6 2001:5c0:1106:2700::/64 {
        # Range for clients
        range6 2001:5c0:1106:2700::2 2001:5c0:1106:2700::254;
        # Additional options
        #option dhcp6.name-servers fec0:0:0:1::1;
        #option dhcp6.domain-search "domain.localdomain";
        # Prefix range for delegation to sub-routers
        #prefix6 2001:db8:0:100:: 2001:db8:0:f00:: /56;
        # Example for a fixed host address
        #host specialclient {
        #       host-identifier option dhcp6.client-id 00:01:00:01:4a:1f:ba:e3:60:b9:1f:01:23:45;
        #       fixed-address6 2001:db8:0:1::127;
        #}
}

Could I be missing any setting on my client ? Any pointers/suggestions are welcome.

Thanks,
Kunal



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