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Today's Topics:
1. Re: group and agent.circuit-id (Niall O'Reilly)
2. Re: Set up DHCP server IPv6 on Ubuntu 14.04 (Reed Xia)
3. Re: Set up DHCP server IPv6 on Ubuntu 14.04 (Reed Xia)
----------------------------------------------------------------------
Message: 1
Date: Sun, 04 Dec 2016 16:06:42 +0000
From: "Niall O'Reilly" <niall.orei...@ucd.ie>
To: "Users of ISC DHCP" <dhcp-users@lists.isc.org>
Subject: Re: group and agent.circuit-id
Message-ID: <c6089254-6b85-49c5-8257-362828267...@ucd.ie>
Content-Type: text/plain; format=flowed
On 4 Dec 2016, at 5:01, Nick Urbanik wrote:
> Currently, we have more than 2000 classes of the
> form:
> class "a-circuit-id" {
> match if option agent.circuit-id = "a-circuit-id";
> set logged-class = "static";
> }
From what I've read in the Handbook and man-pages, this configuration
will give you a mean of more than 1000 trips around the loop that
compares the value provided by the client with each in turn of your
configured values.
> ...
> that are then used to allocate static IPs like this, inside subnet
> declarations:
> pool { failover peer "partner"; allow members of "a-circuit-id"; range
> 11.12.13.14; }
> ...
I'm not sure that failover gains you anything for a singleton range,
as there isn't any arbitrary state to be communicated to the partner.
Without failover, you can gain resilience by having identical
configurations
on more than two servers; failover limits you to two (per pool).
> I have some questions:
> 1. Would this existing scheme clash with that you proposed?
I can't say for sure, as I've never used or even tested such a
combination
of schemes. I don't know why they would cause each other problems
unless
you (mis-) configured the same value in a 'match if ...' statement as
in
a 'subclass' declaration.
> 2. Could things work better if I changed the static allocation scheme
> to use subclasses?
The matching would be faster, as subclasses are implemented using a
hash
table rather than a comparison loop.
> I'm not really sure how, since currently, each
> static assignment corresponds to a separate class, whereas
> subclasses provide a way to add multiple members to one class.
It's subtler than that: each subclass is a class of its own as well,
although without a distinct name to be referenced by.
This doesn't necessarily mean that the 'subclass' approach can meet
your
needs. It's not clear from either the Handbook or the man-page
whether
a 'fixed-address' declaration is allowed or forbidden in a 'subclass'
declaration. If it's allowed, then I think there's a solution which
gives
the performance advantage of subclass hashing and avoids the
complexity
of failover, like this:
class "dns-by-circuit-id" {
match option agent.circuit-id;
option domain-name-servers 1.2.3.4, 5.6.7.8;
}
# per-circuit-id subclasses, each with its own IP address
subclass "dns-by-circuit-id" "whatever" { fixed-address
11.12.13.14; }
If 'fixed-address' isn't allowed here, then I think you have to
continue with multiple classes. I expect you can drop failover
except
for customers (if any) for whom you assign a non-singleton pool.
I hope this helps.
Best regards,
Niall O'Reilly
------------------------------
Message: 2
Date: Mon, 5 Dec 2016 10:18:53 +0800
From: Reed Xia <huaqin2...@gmail.com>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: Set up DHCP server IPv6 on Ubuntu 14.04
Message-ID:
<CAB_-H09iPnpHg=7amBuyGCmKZmKvKrZXfmamX0QVJzrQmS=d...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Hi Niall,
Yes I mean 2001::7. Thanks for help point out the problem! I learn that it
need IPv6 prefix, I referred to a dhcpd6.conf from Internet and looked it
worked.
*default-lease-time 640;max-lease-time 700;log-facility local7;subnet6
2011:1:2::/48 { # Range for clients range6 2011:1:2::111
2011:1:2::234; # Additional options option dhcp6.name-servers
2011:1:2::2012; option dhcp6.domain-search
"ipv6.domain.example"; # Prefix range for delegation to
sub-routers prefix6 2011:1:2:2:: 2011:1:2:2:: /64; # 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
2011:1:2::110; }}*
*root@reed-Lenovo:/etc/dhcp# /root/dhcp-4.3.4/server/dhcpd -6 -d -cf
/etc/dhcp/dhcpd6.conf eth0Internet Systems Consortium DHCP Server
4.3.4Copyright 2004-2016 Internet Systems Consortium.All rights
reserved.For info, please visit https://www.isc.org/software/dhcp/
<https://www.isc.org/software/dhcp/>WARNING: Host declarations are global.
They are not limited to the scope you declared them in.Config file:
/etc/dhcp/dhcpd6.confDatabase file: /var/db/dhcpd6.leasesPID file:
/var/run/dhcpd6.pidWrote 0 deleted host decls to leases file.Wrote 0 new
dynamic host decls to leases file.Wrote 0 NA, 0 TA, 1 PD leases to lease
file.Bound to *:547Listening on Socket/5/eth0/2011:1:2::/48Sending on
Socket/5/eth0/2011:1:2::/48Server starting service.Solicit message from
fe80::3291:8fff:fe05:bf86 port 546, transaction ID 0xF5FFA00Advertise PD:
address 2011:1:2:2::/64 to client with duid 00:03:00:01:30:91:8f:05:bf:86
iaid = 1 valid for 640 secondsSending Advertise to
fe80::3291:8fff:fe05:bf86 port 546Request message from
fe80::3291:8fff:fe05:bf86 port 546, transaction ID 0x936B200Reply PD:
address 2011:1:2:2::/64 to client with duid 00:03:00:01:30:91:8f:05:bf:86
iaid = 1 valid for 640 secondsSending Reply to fe80::3291:8fff:fe05:bf86
port 546*
Thanks,
Reed
On Thu, Dec 1, 2016 at 6:31 PM, Niall O'Reilly <niall.orei...@ucd.ie> wrote:
> On 1 Dec 2016, at 9:47, Reed Xia wrote:
>
> I have a Ubuntu 14.04 with 2 Ethernet adapters(eth0 and eth1), eth0 is
>> connected to an homeware device, I need set up DHCP IPv6 service against
>> eth0(I set the IPv6 address for eth0 as 2007::7/64 in Ubuntu),
>>
>
> Perhaps you mean 2001::7 (mentioned in the configuration fragment you
> sent) ?
>
> and I want the homeware to obtain a fixed IPv6 address(2001::10),
>>
>
> 2001::/32 is reserved for a specific purpose (see
> https://www.iana.org/assignments/iana-ipv6-special-registry/
> iana-ipv6-special-registry.xhtml). Re-using part of this address space
> for your own, private
> purpose is likely to cause trouble for you or others.
>
> You should not do this.
>
> If you have not been assigned a global address prefix, you should
> consider using a Unique
> Local IPv6 prefix (see https://tools.ietf.org/html/rfc4193).
>
> so I did it in following way, now the problem is the homeware always
>> cannot get IPv6, I can see message "Unable to pick client prefix: no IPv6
>> pools on this shared network" from dhcpd service, I guess the dhcpd6.conf
>> have some problem, can you please help figure out?
>>
>
> The message is telling you that a 'pool6' specification is expected. It
> is clear from
> the man-page that this is allowed, but NOT clear that it is required.
> I'ld suggest
> trying the following where you currently have just a 'range6'
> specification:
>
> pool6 {
> range6 ...
> }
>
> Best regards,
>
> Niall O'Reilly
> _______________________________________________
> dhcp-users mailing list
> dhcp-users@lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users
>
--
Thanks,
- Reed
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Message: 3
Date: Mon, 5 Dec 2016 17:26:44 +0800
From: Reed Xia <huaqin2...@gmail.com>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: Set up DHCP server IPv6 on Ubuntu 14.04
Message-ID:
<cab_-h08kkavz5xlfjwfdmxxcv60x3kvtp1cyttmi-01bkjm...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Hi Niall,
After I use this dhcpd6.conf, the homeware(it's a router actually) always
obtain the IP 2011:1:2:2::1, may I ask do you know how to refine the
dhcpd6.conf to make it obtain the IP such as 2011:1:2:2::7?
*default-lease-time 640;max-lease-time 700;log-facility local7;subnet6
2011:1:2::/48 { # Range for clients range6 2011:1:2::111
2011:1:2::234; # Additional options option dhcp6.name-servers
2011:1:2::2012; option dhcp6.domain-search "ipv6.domain.example";
# Prefix range for delegation to sub-routers prefix6
2011:1:2:2:: 2011:1:2:2:: /64; # 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 2011:1:2::110; }}*
Thanks,
Reed
On Mon, Dec 5, 2016 at 10:18 AM, Reed Xia <huaqin2...@gmail.com> wrote:
> Hi Niall,
>
> Yes I mean 2001::7. Thanks for help point out the problem! I learn that
> it need IPv6 prefix, I referred to a dhcpd6.conf from Internet and looked
> it worked.
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> *default-lease-time 640;max-lease-time 700;log-facility local7;subnet6
> 2011:1:2::/48 { # Range for clients range6 2011:1:2::111
> 2011:1:2::234; # Additional options option dhcp6.name-servers
> 2011:1:2::2012; option dhcp6.domain-search
> "ipv6.domain.example"; # Prefix range for delegation to
> sub-routers prefix6 2011:1:2:2:: 2011:1:2:2:: /64; # 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
> 2011:1:2::110; }}*
>
>
> *root@reed-Lenovo:/etc/dhcp# /root/dhcp-4.3.4/server/dhcpd -6 -d -cf
> /etc/dhcp/dhcpd6.conf eth0Internet Systems Consortium DHCP Server
> 4.3.4Copyright 2004-2016 Internet Systems Consortium.All rights
> reserved.For info, please visit https://www.isc.org/software/dhcp/
> <https://www.isc.org/software/dhcp/>WARNING: Host declarations are global.
> They are not limited to the scope you declared them in.Config file:
> /etc/dhcp/dhcpd6.confDatabase file: /var/db/dhcpd6.leasesPID file:
> /var/run/dhcpd6.pidWrote 0 deleted host decls to leases file.Wrote 0 new
> dynamic host decls to leases file.Wrote 0 NA, 0 TA, 1 PD leases to lease
> file.Bound to *:547Listening on Socket/5/eth0/2011:1:2::/48Sending on
> Socket/5/eth0/2011:1:2::/48Server starting service.Solicit message from
> fe80::3291:8fff:fe05:bf86 port 546, transaction ID 0xF5FFA00Advertise PD:
> address 2011:1:2:2::/64 to client with duid 00:03:00:01:30:91:8f:05:bf:86
> iaid = 1 valid for 640 secondsSending Advertise to
> fe80::3291:8fff:fe05:bf86 port 546Request message from
> fe80::3291:8fff:fe05:bf86 port 546, transaction ID 0x936B200Reply PD:
> address 2011:1:2:2::/64 to client with duid 00:03:00:01:30:91:8f:05:bf:86
> iaid = 1 valid for 640 secondsSending Reply to fe80::3291:8fff:fe05:bf86
> port 546*
> Thanks,
> Reed
>
> On Thu, Dec 1, 2016 at 6:31 PM, Niall O'Reilly <niall.orei...@ucd.ie>
> wrote:
>
>> On 1 Dec 2016, at 9:47, Reed Xia wrote:
>>
>> I have a Ubuntu 14.04 with 2 Ethernet adapters(eth0 and eth1), eth0 is
>>> connected to an homeware device, I need set up DHCP IPv6 service against
>>> eth0(I set the IPv6 address for eth0 as 2007::7/64 in Ubuntu),
>>>
>>
>> Perhaps you mean 2001::7 (mentioned in the configuration fragment you
>> sent) ?
>>
>> and I want the homeware to obtain a fixed IPv6 address(2001::10),
>>>
>>
>> 2001::/32 is reserved for a specific purpose (see
>> https://www.iana.org/assignments/iana-ipv6-special-registry/
>> iana-ipv6-special-registry.xhtml). Re-using part of this address space
>> for your own, private
>> purpose is likely to cause trouble for you or others.
>>
>> You should not do this.
>>
>> If you have not been assigned a global address prefix, you should
>> consider using a Unique
>> Local IPv6 prefix (see https://tools.ietf.org/html/rfc4193).
>>
>> so I did it in following way, now the problem is the homeware always
>>> cannot get IPv6, I can see message "Unable to pick client prefix: no IPv6
>>> pools on this shared network" from dhcpd service, I guess the dhcpd6.conf
>>> have some problem, can you please help figure out?
>>>
>>
>> The message is telling you that a 'pool6' specification is expected.
>> It is clear from
>> the man-page that this is allowed, but NOT clear that it is required.
>> I'ld suggest
>> trying the following where you currently have just a 'range6'
>> specification:
>>
>> pool6 {
>> range6 ...
>> }
>>
>> Best regards,
>>
>> Niall O'Reilly
>> _______________________________________________
>> dhcp-users mailing list
>> dhcp-users@lists.isc.org
>> https://lists.isc.org/mailman/listinfo/dhcp-users
>>
>
>
>
> --
> Thanks,
> - Reed
>
--
Thanks,
- Reed
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