Re: DHCPv6 IA_PD - how-to

Karl Denninger <[email protected]> Tue, 30 Jul 2024 10:06:17 -0400
Newsgroups	gmane.os.freebsd.devel.net
Message-ID	<[email protected]>
Ok so I have a "new problem" attempting to use dhcp6c for BOTH IPv4 and 
IPv6.

This is the salient part of the configuration file (the rest is 
basically defaults):

# Generate SLAAC address using the Hardware Address of the interface
#slaac hwaddr
# OR generate Stable Private IPv6 Addresses based from the DUID
#slaac private

allowinterfaces igb0

#ipv6only
#ipv4only

#
# Do not run these hooks; DO run the DDNS one in exit-hooks
#
nohook resolv.conf hostname ntp.conf

interface igb0
         ia_na 1
         ia_pd 1/::/56 igb1/0/64 igb1.4/1/64

If I do "ipv6only" and run dhcpcd -T then I do get a prefix:

root@IpGw:/usr/local/etc # dhcpcd -T
dhcpcd-10.0.8 starting
DUID 00:01:00:01:2e:3a:76:f1:00:0d:b9:46:71:88
igb0: IAID b9:46:71:88
igb0: IA type 3 IAID 00:00:00:01
igb0: IA type 25 IAID 00:00:00:01
igb0: soliciting a DHCPv6 lease
igb1: activating for delegation
igb1: IAID b9:46:71:89
igb1.4: activating for delegation
igb1.4: IAID ff:00:00:04
igb0: soliciting an IPv6 router
igb0: ADV 2600:6c5d:7009:600:c5e0:25ed:b364:36c2/128 from 
fe80::201:5cff:fe70:7c46
igb0: REPLY6 received from fe80::201:5cff:fe70:7c46
interface=igb0
pid=3395
protocol=dhcp6
reason=TEST
skip_hooks='resolv.conf hostname ntp.conf'
ifcarrier=up
ifflags=34883
ifmetric=1001
ifmtu=1500
ifwireless=0
new_dhcp6_client_id=000100012e3a76f1000db9467188
new_dhcp6_domain_search=search.charter.net
new_dhcp6_ia_na1_ia_addr1=2600:6c5d:7009:600:c5e0:25ed:b364:36c2
new_dhcp6_ia_na1_ia_addr1_pltime=3337
new_dhcp6_ia_na1_ia_addr1_vltime=3337
new_dhcp6_ia_na1_iaid=00000001
new_dhcp6_ia_na1_t1=1537
new_dhcp6_ia_na1_t2=2617
new_dhcp6_ia_pd1_iaid=00000001
new_dhcp6_ia_pd1_prefix1=2600:6c5d:5d00:9d00::
new_dhcp6_ia_pd1_prefix1_length=56
new_dhcp6_ia_pd1_prefix1_pltime=3337
new_dhcp6_ia_pd1_prefix1_vltime=3337
new_dhcp6_ia_pd1_t1=1537
new_dhcp6_ia_pd1_t2=2617
new_dhcp6_name_servers='2607:f428:ffff:ffff::1 2607:f428:ffff:ffff::2'
new_dhcp6_server_id=000100012261b73d00144f9bcc84
dhcpcd exited

This looks ok.  That prefix is good and I presume if I let it set the 
other interfaces it will be ok.

But if I do not say "ipv6only", leaving it that commented out so I can 
get both, I get on dhcpcd -T:

root@IpGw:/usr/local/etc # dhcpcd -T
dhcpcd-10.0.8 starting
DUID 00:01:00:01:2e:3a:76:f1:00:0d:b9:46:71:88
igb0: IAID b9:46:71:88
igb0: IA type 3 IAID 00:00:00:01
igb0: IA type 25 IAID 00:00:00:01
igb0: soliciting a DHCPv6 lease
igb1: activating for delegation
igb1: IAID b9:46:71:89
igb1.4: activating for delegation
igb1.4: IAID ff:00:00:04
igb0: rebinding lease of 71.15.253.203
igb0: leased 71.15.253.203 for 2813 seconds
interface=igb0
pid=3358
protocol=dhcp
reason=TEST
skip_hooks='resolv.conf hostname ntp.conf'
ifcarrier=up
ifflags=34883
ifmetric=1001
ifmtu=1500
ifwireless=0
old_broadcast_address=255.255.255.255
old_dhcp_lease_time=3600
old_dhcp_message_type=5
old_dhcp_rebinding_time=3150
old_dhcp_renewal_time=1800
old_dhcp_server_identifier=96.33.192.1
old_domain_name_servers='71.10.216.1 71.10.216.2'
old_interface_mtu=1500
old_ip_address=71.15.253.203
old_network_number=71.15.252.0
old_routers=71.15.252.1
old_subnet_cidr=22
old_subnet_mask=255.255.252.0
new_broadcast_address=255.255.255.255
new_dhcp_lease_time=2813
new_dhcp_message_type=5
new_dhcp_rebinding_time=2363
new_dhcp_renewal_time=1013
new_dhcp_server_identifier=96.33.192.1
new_domain_name_servers='71.10.216.1 71.10.216.2'
new_interface_mtu=1500
new_ip_address=71.15.253.203
new_network_number=71.15.252.0
new_routers=71.15.252.1
new_subnet_cidr=22
new_subnet_mask=255.255.252.0
dhcpcd exited

And if I actually boot the machine that way (rather than run it in test) 
I get only IpV4; the v6 solicitation never happens.

On 7/29/2024 20:10, moto kawasaki wrote:
> Hi Roy,
>
> Thank you very much for the configuration example with dhcpcd!
> Also I didn't know delayed auth had been obsoleted, thanks for letting
> me to notice.
> I'll try dhcpcd instead of dhcp6c.
>
> Best Regards,
>
-- 
Karl Denninger
[email protected]
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